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Engineering Materials - Nonferrous Metals - Gold, Silver, Platinum


Materials: Non-Ferrous Metals


 
Non - Ferrous Metals

 

Precious Metals

  • Gold is an extremely inert, soft, ductile metal, that undergoes very little work hardening. A gram of pure gold can be worked into leaf covering 6 ft^2 and only 0.0000033 in. thick. It is used chiefly for linings or electrodeposits and is often alloyed with other metals such as copper or nickel to increase strength or hardness.

  • Silver is a very malleable, ductile, and corrosion resistant metal that has the highest thermal and electrical conductivity of all metals and is the least costly of all the precious metals. Alloyed with copper, and sometimes with zinc, silver is also used in high-melting temperature solders.

  • Platinum is an extremely malleable, ductile, and corrosion resistant silver-white metal. When heated to redness, it softens and is easily worked. It is nearly nonoxidizable and is soluble only in liquids that generate free chlorine such as aqua regia. Because platinum is inert and stable, even at high temperatures, the metal is used for high-temperature handling of high-purity chemicals and laboratory materials. Other applications include electrical contacts, resistance wire, thermocouples, and standard weights.





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