The Full Wiki

brass: Wikis


Encyclopedia

, along with zinc and copper samples.]]

Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties.[1] In comparison, bronze is principally an alloy of copper and tin.[2] Despite this distinction some types of brasses are called bronzes and vice-versa.[3] Brass is a substitutional alloy. It is used for decoration for its bright gold-like appearance; for applications where low friction is required such as locks, gears, bearings, doorknobs, ammunition, and valves; for plumbing and electrical applications; and extensively in musical instruments such as horns and bells for its acoustic properties. It is also used in zippers. Because it is softer than most other metals in general use, brass is often used in situations where it is important that sparks not be struck, as in fittings and tools around explosive gases.[4]

Brass has a muted yellow color, somewhat similar to gold. It is relatively resistant to tarnishing, and is often used as decoration and for coins. In antiquity, polished brass was often used as a mirror.

Although forms of brass have been in use since prehistory,[5] its true nature as a copper-zinc alloy was not understood until the post medieval period because the zinc vapour which reacted with copper to make brass was not recognised as a metal.[6] The King James Bible makes many references to "brass".[7] The Shakespearean English form of the word 'brass' can mean any bronze alloy, or copper, rather than the strict modern definition of brass.[citation needed] The Apostle Paul makes the only Biblical reference to brass at 1 Corinthians 13:1. The earliest brasses may have been natural alloys made by smelting zinc-rich copper ores.[8] By the Roman period brass was being deliberately produced from metallic copper and zinc minerals using the cementation process and variations on this method continued until the mid 19th century.[9] It was eventually replaced by speltering, the direct alloying of copper and zinc metal which was introduced to Europe in the 16th century.[8]

Contents

Properties

of rolled and annealed brass (400X magnification)]]

The malleability and acoustic properties of brass have made it the metal of choice for brass musical instruments such as the trombone, tuba, trumpet, cornet, euphonium, tenor horn, and the French horn. Even though the saxophone is classified as a woodwind instrument and the harmonica is a free reed aerophone, both are also often made from brass. In organ pipes of the reed family, brass strips (called tongues) are used as the reeds, which beat against the shallot (or beat "through" the shallot in the case of a "free" reed).

Brass has higher malleability than bronze or zinc. The relatively low melting point of brass (900 to 940°C, depending on composition) and its flow characteristics make it a relatively easy material to cast. By varying the proportions of copper and zinc, the properties of the brass can be changed, allowing hard and soft brasses. The density of brass is approximately 8400 to 8730 kilograms per cubic metre[10] (equivalent to 8.4 to 8.73 grams per cubic centimetre).

Today almost 90% of all brass alloys are recycled.[11] Because brass is not ferromagnetic, it can be separated from ferrous scrap by passing the scrap near a powerful magnet. Brass scrap is collected and transported to the foundry where it is melted and recast into billets. Billets are heated and extruded into the desired form and size.

Aluminium makes brass stronger and more corrosion resistant. Aluminium also causes a highly beneficial hard layer of aluminium oxide (Al2O3) to be formed on the surface that is thin, transparent and self healing. Tin has a similar effect and finds its use especially in sea water applications (naval brasses). Combinations of iron, aluminium, silicon and manganese make brass wear and tear resistant.

Lead content

To enhance the machinability of brass, lead is often added in concentrations of around 2%. Since lead has a lower melting point than the other constituents of the brass, it tends to migrate towards the grain boundaries in the form of globules as it cools from casting. The pattern the globules form on the surface of the brass increases the available lead surface area which in turn affects the degree of leaching. In addition, cutting operations can smear the lead globules over the surface. These effects can lead to significant lead leaching from brasses of comparatively low lead content.[12]

Silicon is an alternative to lead; however, when silicon is used in a brass alloy, the scrap must never be mixed with leaded brass scrap because of contamination and safety problems.[13]

In October 1999 the California State Attorney General sued 13 key manufacturers and distributors over lead content. In laboratory tests, state researchers found the average brass key, new or old, exceeded the California Proposition 65 limits by an average factor of 19, assuming handling twice a day.[14] In April 2001 manufacturers agreed to reduce lead content to 1.5%, or face a requirement to warn consumers about lead content. Keys plated with other metals are not affected by the settlement, and may continue to use brass alloys with higher percentage of lead content.[15][16]

Also in California, lead-free materials must be used for "each component that comes into contact with the wetted surface of pipes and pipe fittings, plumbing fittings and fixtures." On January 1, 2010, the maximum amount of lead in "lead-free brass" in California was reduced by more than an order of magnitude from 4% to 0.25% lead. The common practice of using pipes for electrical grounding is discouraged, as it accelerates lead corrosion.[17][18]

Applications

Harsh environments: The so called dezincification resistant (DZR) brasses are used where there is a large corrosion risk and where normal brasses do not meet the standards. Applications with high water temperatures, chlorides present or deviating water qualities (soft water) play a role. DZR-brass is excellent in water boiler systems. This brass alloy must be produced with great care, with special attention placed on a balanced composition and proper production temperatures and parameters to avoid long-term failures.

Germicidal properties: The copper in brass makes brass germicidal, via the oligodynamic effect. For example, brass doorknobs disinfect themselves of many bacteria within eight hours.[19] This effect is important in hospitals, and useful in many contexts.

Brass door hardware: Brass hardware is generally lacquered when new, which prevents tarnishing of the metal. Freshly polished brass is similar to gold in appearance, but becomes more reddish within days of exposure to the elements. A traditional polish is Brasso.

Other: Brass was used to make fan blades, fan cages and motor bearings in many antique fans that date before the 1930s. Brass can also be used for fixings for use in cryogenic systems.[20] Brass has also been used to make lower end Paiste cymbals.

Season cracking

Brass is susceptible to stress corrosion cracking, especially from ammonia or substances containing or releasing ammonia. The problem is sometimes known as season cracking after it was first discovered in brass cartridge cases used for rifle ammunition during the 1920s in the Indian Army. The problem was caused by high residual stresses from cold forming of the cases during manufacture, together with chemical attack from traces of ammonia in the atmosphere. The cartridges were stored in stables and the ammonia concentration rose during the hot summer months, so initiating brittle cracks. The problem was resolved by annealing the cases, and storing the cartridges elsewhere.

Brass types

  • Admiralty brass contains 30% zinc, and 1% tin which inhibits dezincification in many environments.
  • Aich's alloy typically contains 60.66% copper, 36.58% zinc, 1.02% tin, and 1.74% iron. Designed for use in marine service owing to its corrosion resistance, hardness and toughness. A characteristic application is to the protection of ships' bottoms, but more modern methods of cathodic protection have rendered its use less common. Its appearance resembles that of gold.[21]
  • Alpha brasses with less than 35% zinc, are malleable, can be worked cold, and are used in pressing, forging, or similar applications. They contain only one phase, with face-centered cubic crystal structure. Prince's metal or Prince Rupert's metal is a type of alpha brass containing 75% copper and 25% zinc. Due to its beautiful yellow color, it is used as an imitation of gold.[22] The alloy was named after Prince Rupert of the Rhine.
  • Alpha-beta brass (Muntz metal), also called duplex brass, is 35–45% zinc and is suited for hot working. It contains both α and β' phase; the β'-phase is body-centered cubic and is harder and stronger than α. Alpha-beta brasses are usually worked hot.
  • Aluminium brass contains aluminium, which improves its corrosion resistance. It is used for seawater service[23] and also in Euro coins (Nordic gold).
  • Arsenical brass contains an addition of arsenic and frequently aluminium and is used for boiler fireboxes.
  • Beta brasses, with 45–50% zinc content, can only be worked hot, and are harder, stronger, and suitable for casting.
  • Cartridge brass is a 30% zinc brass with good cold working properties.
  • Common brass, or rivet brass, is a 37% zinc brass, cheap and standard for cold working.
  • DZR brass is dezincification resistant brass with a small percentage of arsenic.
  • Gilding metal is the softest type of brass commonly available. An alloy of 95% copper and 5% zinc, gilding metal is typically used for ammunition components.
  • High brass contains 65% copper and 35% zinc, has a high tensile strength and is used for springs, screws, and rivets.
  • Leaded brass is an alpha-beta brass with an addition of lead. It has excellent machinability.
  • Lead-free brass as defined by California Assembly Bill AB 1953 contains "not more than 0.25 percent lead content".[17]
  • Low brass is a copper-zinc alloy containing 20% zinc with a light golden color and excellent ductility; it is used for flexible metal hoses and metal bellows.
  • Manganese brass is a brass most notably used in making golden dollar coins in the United States. It contains roughly 70% copper, 29% zinc, and 1.3% manganese.[24]
  • Muntz metal is about 60% copper, 40% zinc and a trace of iron, used as a lining on boats.
  • Nickel brass is composed of 70% copper, 24.5% zinc and 5.5% nickel used to make pound coins in the pound sterling currency.
  • Naval brass, similar to admiralty brass, is 40% zinc and 1% tin.
  • Nordic gold, used in 10, 20 and 50 cts euro coins, contains 89% copper, 5% aluminium, 5% zinc, and 1% tin.
  • Red brass is both an American term for the copper-zinc-tin alloy known as gunmetal, and an alloy which is considered both a brass and a bronze. It typically contains 85% copper, 5% tin, 5% lead, and 5% zinc.[25] Red brass is also an alternative name for copper alloy C23000, which is composed of 14–16% zinc, 0.05% iron and lead, and the remainder copper.[26] It may also refer to ounce metal, another copper-zinc-tin alloy.
  • Rich low brass (Tombac) is 15% zinc. It is often used in jewelry applications.
  • Tonval brass (also called CW617N or CZ122 or OT58) is a copper-lead-zinc alloy. It is not recommended for seawater use, being susceptible to dezincification.[27][28]
  • White brass contains more than 50% zinc and is too brittle for general use. The term may also refer to certain types of nickel silver alloys as well as Cu-Zn-Sn alloys with high proportions (typically 40%+) of tin and/or zinc, as well as predominantly zinc casting alloys with copper additive.
  • Yellow brass is an American term for 33% zinc brass.

History

Early copper zinc alloys

In West Asia and the Eastern Mediterranean early copper zinc alloys are now known in small numbers from a number of third Millennium BC sites in the Aegean, Iraq, the United Arab Emirates, Kalmikia, Turkmenistan and Georgia and from 2nd Millennium BC sites in West India, Uzbekistan, Iran, Syria, Iraq and Palestine.[29] However, isolated examples of copper-zinc alloys are known in China from as early as the 5th Millennium BC.[30]

The compositions of these early "brass" objects are very variable and most have zinc contents of between 5% and 15% wt which is lower than in brass produced by cementation.[31] These may be "natural alloys" manufactured by smelting zinc rich copper ores in reducing conditions. Many have similar tin contents to contemporary bronze artefacts and it is possible that some copper-zinc alloys were accidental and perhaps not even distinguished from copper.[31] However the large number of copper-zinc alloys now known suggests that at least some were deliberately manufactured and many have zinc contents of more than 12% wt which would have resulted in a distinctive golden color.[32]

By the 8th-7th century BC Assyrian cuneiform tablets mention the exploitation of the "copper of the mountains" and this may refer to "natural" brass.[33] Oreichalkos, the Ancient Greek translation of this term, was later adapted to the Latin aurichalcum meaning "golden copper" which became the standard term for brass.[34] In the 4th century BC Plato knew oreichalkos as rare and nearly as valuable as gold[35] and Pliny describes how aurichalcum had come from Cypriot ore deposits which had been exhausted by the 1st century AD.[36] '

Brass making in the Roman World

During the later part of first Millennium BC the use of brass spread across a wide geographical area from Britain[37] and Spain[38] in the west to Afghanistan, Pakistan and India in the east.[39] This seems to have been encouraged by exports and influence from the Middle-East and eastern Mediterranean where deliberate production of brass from metallic copper and zinc ores had been introduced.[40] The 4th century BC writer Theopompus, quoted by Strabo, describes how heating earth from Andeira in Turkey produced "droplets of false silver", probably metallic zinc, which could be used to turn copper into oreichalkos.[41] In the 1st century BC the Greek Dioscorides seems to have recognised a link between zinc minerals and brass describing how Cadmia (zinc oxide) was found on the walls of furnaces used to heat either zinc ore or brass and explaining that it can then be used to make brass.[42]

By the first century BC brass was available in sufficient supply to use as coinage in Phrygia and Bithynia,[43] and after the Augustan currency reform of 23 BC it was also used to make Roman dupondii and sestertii.[44] The uniform use of brass for coinage and military equipment across the Roman world may indicate a degree of state involvement in the industry,[45] and brass even seems to have been deliberately boycotted by Jewish communities in Palestine because of its association with Roman authority.[46]

Brass was produced by the cementation process where copper and zinc ore are heated together until zinc vapour is produced which reacts with the copper. There is good archaeological evidence for this process and crucibles used to produce brass by cementation have been found on Roman period sites including Xanten[47] and Nidda[48] in Germany, Lyon in France[49] and at a number of sites in Britain.[50] They vary in size from tiny acorn sized to large amphorae like vessels but all have elevated levels of zinc on the interior and are lidded.[49] They show no signs of slag or metal prills suggesting that zinc minerals were heated to produce zinc vapour which reacted with metallic copper in a solid state reaction. The fabric of these crucibles is porous, probably designed to prevent a build up of pressure, and many have small holes in the lids which may be designed to release pressure[49] or to add additional zinc minerals near the end of the process. Dioscorides mentioned that zinc minerals were used for both the working and finishing of brass, perhaps suggesting secondary additions.[51]

Brass made during the early Roman period seems to have varied between 20% to 28% wt zinc.[52] The high content of zinc in coinage and brass objects declined after the first century AD and it has been suggested that this reflects zinc loss during recycling and thus an interruption in the production of new brass.[53] However it is now thought this was probably a deliberate change in composition[54] and overall the use of brass increases over this period making up around 40% of all copper alloys used in the Roman world by the 4th century AD.[55]

Brass making in the Medieval Period

File:Renier de Huy
Baptism of Christ on the 12th century Baptismal font at St Bartholomew's Church, Liège.

Little is known about the production of brass during the centuries immediately after the collapse of the Roman Empire. Disruption in the trade of tin for bronze from Western Europe may have contributed to the increasing popularity of brass in the east and by the 6th-7th centuries AD over 90% of copper alloy artefacts from Egypt were made of brass.[56] However other alloys such as low tin bronze were also used and they vary depending on local cultural attitudes, the purpose of the metal and access to zinc, especially between the Islamic and Byzantine world.[57] Conversely the use of true brass seems to have declined in Western Europe during this period in favour of gunmetals and other mixed alloys[58] but by the end of the first Millennium AD brass artefacts are found in Scandinavian graves in Scotland,[59] brass was being used in the manufacture of coins in Northumbria[60] and there is archaeological and historical evidence for the production of brass in Germany[61] and The Low Countries[62] areas rich in calamine ore which would remain important centres of brass making throughout the medieval period,[63] especially Dinant - brass objects are still collectively known as dinanterie in French. The Baptismal font at St Bartholomew's Church, Liège in modern Belgium (before 1117) is an outstanding masterpiece of Romanesque brass casting.

The cementation process continued to be used but literary sources from both Europe and the Islamic world seem to describe variants of a higher temperature liquid process which took places in open topped crucibles.[64] Islamic cementation seems to have used zinc oxide known as tutiya or tutty rather than zinc ores for brass making resulting in a metal with lower iron impurities.[65] A number of Islamic writers and the 13th century Italian Marco Polo describe how this was obtained by sublimation from zinc ores and condensed onto clay or iron bars, archaeological examples of which have been identified at Kush in Iran.[66] It could then be used for brass making or medicinal purposes. In 10th century Yemen al-Hamdani described how spreading al-iglimiya, probably zinc oxide, onto the surface of molten copper produced tutiya vapour which then reacted with the metal.[67] The 13th century Iranian writer al-Kashani describes a more complex process whereby tutiya was mixed with raisins and gently roasted before being added to the surface of the molten metal. A temporary lid was added at this point presumably to minimise the escape of zinc vapour.[68]

In Europe a similar liquid process in open topped crucibles took place which was probably less efficient than the Roman process and the use of the term tutty by Albertus Magnus in the 13th century suggests influence from Islamic technology.[69] The 12th century German monk Theophilus described how preheated crucibles were one sixth filled with powdered calamine and charcoal then topped up with copper and charcoal before being melted, stirred then filled again. The final product was cast, then again melted with calamine. It has been suggested that this second melting may have taken place at a lower temperature to allow more zinc to be absorbed.[70] Albertus Magnus noted that the "power" of both calamine and tutty could evaporate and described how the addition of powdered glass could create a film to bind it to the metal.[71] German brass making crucibles are known from Dortmund dating to the 10th century AD and from Soest and Schwerte in Westphalia dating to around the 13th century confirm Theophilus' account as they are open topped, although ceramic discs from Soest may have served as loose lids which may have been used to reduce zinc evaporation, and have slag on the interior resulting from a liquid process.[72]

Brass making in Renaissance and Post Medieval Europe

The Renaissance saw important changes to both the theory and practice of brassmaking in Europe. By the 15th century there is evidence for the renewed use of lidded cementation crucibles at Zwickau in Germany.[73] These large crucibles were capable of producing c.20 kg of brass.[74] There are traces of slag and pieces of metal on the interior. Their irregular composition suggesting that this was a lower temperature not entirely liquid process.[75] The crucible lids had small holes which were blocked with clay plugs near the end of the process presumably to maximise zinc absorption in the final stages.[76] Triangular crucibles were then used to melt the brass for casting.[77]

16th century technical writers such as Biringuccio, Ercker and Agricola described a variety of cementation brass making techniques and came closer to understanding the true nature of the process noting that copper became heavier as it changed to brass and that it became more golden as additional calamine was added.[78] Zinc metal was also becoming more commonplace By 1513 metallic zinc ingots from India and China were arriving in London and pellets of zinc condensed in furnace flues at the Rammelsberg in Germany were exploited for cementation brass making from around 1550.[79]

Eventually it was discovered that metallic zinc could be alloyed with copper to make brass; a process known as speltering[80] and by 1657 the German chemist Johann Glauber had recognised that calamine was "nothing else but unmeltable zinc" and that zinc was a "half ripe metal."[81] However some earlier high zinc, low iron brasses such as the 1530 Wightman brass memorial plaque from England may have been made by alloying copper with zinc and include traces of cadmium similar those found in some zinc ingots from China.[80]

However the cementation process was not abandoned and as late as the early 19th century there are descriptions of solid state cementation in a domed furnace at around 900-950 degrees Celsius and lasting up to 10 hours.[82] The European brass industry continued to flourish into the post medieval period buoyed by innovations such as the 16th century introduction of water powered hammers for the production of battery wares.[83] By 1559 the Germany city of Aachen alone was capable of producing 300,000 cwt of brass per year.[83] After several false starts during the 16th and 17th centuries the brass industry was also established in England taking advantage of abundant supplies of cheap copper smelted in the new coal fired reverberatory furnace.[84] In 1723 Bristol brass maker Nehemiah Champion patented the use of granulated copper, produced by pouring molten metal into cold water.[85] This increased the surface area of the copper helping it react and zinc contents of up to 33% wt were reported using this new technique.[86]

In 1738 Nehemiah's son William Champion patented a technique for the first industrial scale distillation of metallic zinc known as distillation per descencum or "the English process."[87] This local zinc was used in speltering and allowed greater control over the zinc content of brass and the production of high zinc copper alloys which would have been difficult or impossible to produce using cementation, for use in expensive objects such as scientific instruments, clocks, brass buttons and costume jewellery.[88] However Champion continued to use the cheaper calamine cementation method to produce lower zinc brass [88] and the archaeological remains of bee-hive shaped cementation furnaces have been identified at his works at Warmley.[89] By the mid late 18th century developments in cheaper zinc distillation such as John-Jaques Dony's horizontal furnaces in Belgium and the reduction of tariffs on zinc[90] as well as demand for corrosion resistant high zinc alloys increased the popularity of speltering and as a result cementation was largely abandoned by the mid 19th century.[91]

See also

References

  1. ^ Engineering Designer, v 30, n 3, May–June 2004, 6-9
  2. ^ Machinery Handbook, Industrial Press Inc, New York, Edition 24, page 501
  3. ^ Bearings and bearing metals, The Industrial Press, 1921, p. 29, http://books.google.com/books?id=nopKAAAAMAAJ&pg=PA29. 
  4. ^ OSH Answers: Non-sparking tools
  5. ^ Thornton, C. P. (2007) "Of brass and bronze in prehistoric southwest Asia" in La Niece, S. Hook, D. and Craddock, P.T. (eds.) Metals and mines: Studies in archaeometallurgy London: Archetype Publications. p.
  6. ^ de Ruette, M. (1995) "From Contrefei and Speauter to Zinc: The development of the understanding of the nature of zinc and brass in Post Medieval Europe" in Hook, D.R. and Gaimster, D.R.M (eds) Trade and Discovery: The Scientific Study of Artefacts from Post Medieval Europe and Beyond London: British Museum Occasional Papers 109
  7. ^ Cruden's Complete Concordance p. 55
  8. ^ a b Craddock, P.T. and Eckstein, K (2003) "Production of Brass in Antiquity by Direct Reduction" in Craddock, P.T. and Lang, J. (eds) Mining and Metal Production Through the Ages London: British Museum p.226-7
  9. ^ Rehren, T. and Martinon Torres, M. (2008) "Naturam ars imitate: European brassmaking between craft and science" in Martinon-Torres, M and Rehren, T. (eds) Archaeology, History and Science Integrating Approaches to Ancient Material :Left Coast Press, 170-5
  10. ^ Walker, Roger. "Mass, Weight, Density or Specific Gravity of Different Metals". Density of Materials. United Kingdom: SImetric.co.uk. http://www.simetric.co.uk/si_metals.htm. Retrieved 2009-01-09. "brass - casting, 8400-8700... brass - rolled and drawn, 8430-8730" 
  11. ^ Ashby M, Johnson, K: Materials and Design; The art and science of Material Selection in Product Design, page 223. Elsevier Butterworth Heinemann, 2002, UK.
  12. ^ Stagnation Time, Composition, pH, and Orthophosphate Effects on Metal Leaching from Brass. Washington DC: United States Environmental Protection Agency. September 1996. p. 7. EPA/600/R-96/103. 
  13. ^ Chase Brass & Copper Company, Inc
  14. ^ News & Alerts - California Dept. of Justice - Office of the Attorney General
  15. ^ News & Alerts - California Dept. of Justice - Office of the Attorney General
  16. ^ San Francisco Superior Court, People v. Ilco Unican Corp., et a. (No. 307102) and Mateel Environmental Justice Foundation v. Ilco Unican Corp., et al. (No. 305765)
  17. ^ a b AB 1953 Assembly Bill - Bill Analysis
  18. ^ http://www.dtsc.ca.gov/PollutionPrevention/upload/Lead-in-Plumbing-Fact-Sheet.pdf
  19. ^ Doorknobs: A Source of Nosocomial Infection?
  20. ^ [1] Example patent referring to fixings
  21. ^ A Dictionary of Alloys by E.N. Simons.
  22. ^ National Pollutant Inventory - Copper and compounds fact sheet
  23. ^ Material Properties Data: Aluminum Brass
  24. ^ manganese brass: Definition from Answers.com
  25. ^ Ammen, C.W. (2000). Metalcasting. McGraw-Hill Professional. p. 133. ISBN 007134246X. 
  26. ^ "C23000 Copper Alloys [Red Brass, C230 Material Property Data Sheet"]. Archived from the original on 2010-08-26. http://www.webcitation.org/5sHQvVhHl. Retrieved 2010-08-26. 
  27. ^ Print Layout 1
  28. ^ http://nds.coi.gov.uk/content/detail.asp?NewsAreaID=2&ReleaseID=33758
  29. ^ Thornton 2007,189–201
  30. ^ Zhou Weirong, (2001) "The Emergence and Development of Brass Smelting Techniques in China" Bulletin of the Metals Museum of the Japan Institute of Metals 34. p.87–98.
  31. ^ a b Craddock and Eckstein 2003 p.217
  32. ^ Craddock and Eckstein 2003 p.217, Thornton, C.P and Ehlers, C.B. (2003) "Early Brass in the ancient Near East" in IAMS Newsletter 23 p.27-36
  33. ^ Bayley, J. (1990) "The Production of Brass in Antiquity with Particular Reference to Roman Britain" in Craddock, P.T. (ed.) 2000 Years of Zinc and Brass London: British Museum p.8
  34. ^ Rehren and Martinon Torres 2008, p.169
  35. ^ Craddock, P.T. (1978) "The Composition of Copper Alloys used by the Greek, Etruscan and Roman Civilisations: 3 The Origins and Early Use of Brass" in Journal of Archaeological Science 5 p.8
  36. ^ Pliny the Elder Historia Naturalis XXXIV 2
  37. ^ Craddock, P.T., Cowell, M. and Stead, I. (2004) "Britain's first brass" in Antiquaries Journal 84 p339–46.
  38. ^ Montero-Ruis, I and Perea, A (2007) "Brasses in the early metallurgy of the Iberian Peninsula" in La Niece, S. Hook, D. and Craddock, P.T. (eds.) Metals and mines: Studies in archaeometallurgy London: Archetype:p.136-40
  39. ^ Craddock and Eckstein 2003, p.216-7
  40. ^ Craddock and Eckstein 2003, 217
  41. ^ Bayley 1990, p.9
  42. ^ Craddock and Eckstein 2003, p.222-4. Bayley 1990, p.10.
  43. ^ Craddock, P.T. Burnett, A and Preston K. (1980) "Hellenistic copper-based coinage and the origins of brass" in Oddy, W.A. (ed) Scientific Studies in Numismatics British Museum Occasional Papers 18 p.53-64
  44. ^ Caley, E.R. (1964) Orichalcum and Related Ancient Alloys New York; American Numismatic Society
  45. ^ Bayley 1990, 21, Ponting, M (2002) "Roman Military Copper Alloy Artefacts from Israel: Questions of Organisation and Ethnicity" in Archaeometry 44 (4) p.555-571
  46. ^ Ponting, M (2002) Keeping up with the Roman? Romanisation and Copper Alloys in First Revolt Palestine in IAMS 22 p.3-6
  47. ^ Rehren, T. (1999) "Small Size, Large Scale: Roman Brass Production in Germania Inferior" in Journal of Archaeological Science 26 (8) p.1083-1087
  48. ^ Bachmann, H. (1976) "Crucibles from a Roman Settlement in Germany" in Journal of the Historical Metallurgy Society 10(1) p.34-5
  49. ^ a b c Rehren and Martinon Torres 2008, p.170-1
  50. ^ Bayley 1990
  51. ^ Craddock and Eckstein 2003, p.224
  52. ^ Craddock and Eckstein 2003, 224
  53. ^ Caley 1964
  54. ^ Dungworth, D (1996) "Caley's 'Zinc Decline' reconsidered" in Numismatic Chronicle 156 p.228-234
  55. ^ Craddock 1978, p.14
  56. ^ Craddock, P.T. La Niece, S.C and Hook, D. (1990) "Brass in the Medieval Islamic World" in Craddock, P.T. (ed.) 2000 Years of Zinc and Brass London: British Museum p.73
  57. ^ Ponting, M. (1999) "East Meets West in Post-Classical Bet’shan’ in Journal of Archaeological Science 26 p.1311-21
  58. ^ Bayley 1990, p.22
  59. ^ Eremin, K Graham-Campbell, J. and Wilthew, P. (2002) "Analysis of Copper alloy artefacts from Pagan Norse Graves in Scotland" in Biro, K.T and Eremin, K. (eds) Proceedings of the 31st International Symposium on Archaeometry Oxford: Archaeopress BAR p.342-9
  60. ^ Gilmore, G.R. and Metcalf, D.M (1980) "The alloy of the Northumbrian coinage in the mid-ninth century" in Metcalf, D and Oddy, W. Metallurgy in Numismatics 1 p.83-98
  61. ^ Rehren 1999
  62. ^ Day, J. (1990) "Brass and Zinc in Europe from the Middle Ages until the 19th Century" in Craddock, P.T. (ed.) 2000 Years of Zinc and Brass London: British Museum p.123-150
  63. ^ Day 1990, 124-33
  64. ^ Craddock and Eckstein 2003, p.224-5
  65. ^ Craddock et al 1990, 78
  66. ^ Craddock et al 1990, p.73-6
  67. ^ Craddock et al 1990, p.75
  68. ^ Craddock et al 1990, p.76
  69. ^ Rehren, T (1999) "The same...but different: A juxtaposition of Roman and Medieval brass making in Europe" in Young, S.M.M. (ed.) Metals in antiquity Oxford: Archaeopress p.252-7
  70. ^ Craddock and Eckstein 2003, 226
  71. ^ Rehren and Martinon Torres 2008, 176-8
  72. ^ Rehren and Martinon Torres 2008, p.173-5
  73. ^ Martinon Torres, M. And Rehren, T. (2002) Agricola and Zwickau: Theory and Practice of Renaissance Brass Production in SE Germany in Historical Metallurgy 36(2) p.95-111
  74. ^ Martinon Torres and Rehren 2002, 105-6
  75. ^ Martinon Torres and Rehren 2002, 103
  76. ^ Martinon Torres and Rehren 2002, 104
  77. ^ Martinon Torres and Rehren 2002, 100
  78. ^ Martinon Torres and Rehren 2008, 181-2, de Ruette 1995
  79. ^ de Ruette 1995, 198
  80. ^ a b Craddock and Eckstein 2003, 228
  81. ^ de Ruette 1995, 198-9
  82. ^ Craddock and Eckstein 2003, 226-7.
  83. ^ a b Day 1990, 131
  84. ^ Day, J (1991) "Copper, Zinc and Brass Production" in Day, J and Tylecote, R.F (eds) The Industrial Revolution in Metals London: The Institute of Metals p.135-44
  85. ^ Day 1990, 138
  86. ^ Craddock and Eckstein 2003, 227
  87. ^ Day 1991,179-81, Dungworth, D and White, H (2007) "Scientific examination of zinc-distillation remains from Warmley, Bristol". Historical Metallurgy 41, 77–83
  88. ^ a b Day 1991, 183
  89. ^ Day, J. (1988) "The Bristol Brass Industry: Furnaces and their associated remains" in Journal of Historical Metallurgy 22(1) p.24
  90. ^ Day 1991, 186-9
  91. ^ Day 1991, 192-3, Craddock and Eckstein 2003, 228

External links


Wiktionary

Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

Wikipedia-logo.png
Wikipedia has an article on:

Wikipedia

Contents

English

Pronunciation

Etymology

From Old English bræs.

Noun

Singular
brass

Plural
countable and uncountable; plural brasses

brass (countable and uncountable; plural brasses)

  1. A metallic alloy of copper and zinc used in many industrial and plumbing applications.
  2. (music) A class of wind instruments, usually made of metal (such as brass), that use vibrations of the player's lips to produce sound.
  3. Spent shell casings (usually made of brass); the part of the cartridge left over after bullets have been fired.
  4. The colour of brass.
    brass colour:    
  5. (military) (used as a singular or plural noun; especially in conjunction with the word 'hat') High-ranking officers.
    The brass are not going to like this.
    The brass is not going to like this.
  6. (informal) A brave or foolhardy attitude.
    You've got a lot of brass telling me to do that!
  7. (slang; also brass in pocket) Money.
  8. (slang; from brass nail; countable) A prostitute.
  9. (slang; from brass monkey) Cold.

Translations

Adjective

brass (comparative more brass, superlative most brass)

Positive
brass

Comparative
more brass

Superlative
most brass

  1. (not comparable) Made of brass.
  2. of the colour of brass.
  3. (slang) Bad, annoying.
  4. Related to brass instruments.

Translations

Derived terms

Related terms

See also


Simple English


Brass is an alloy of copper and zinc. Some types of brass are called bronzes.

Brass has a golden appearance. It is harder than pure metals. It costs more than zinc.

There are some common brasses:

  • Alpha brasses - with less than 40% zinc
  • Beta brasses -
  • White brasses - with more than 45% zinc

Things brass are used to make:


Citable sentences

Up to date as of December 29, 2010

Here are sentences from other pages on Zinc, which are similar to those in the above article.








Got something to say? Make a comment.
Your name
Your email address
Message