Posted by Daubin Barshtak on July 20, 2011.
Gold: Gold is a chemical element with the symbol Au and atomic number 79. It has been used as money and in jewelry for centuries. Gold is dense, soft, shiny and the most malleable and ductile of the known metals. Gold can be mixed with many types of other metals to form different variations of gold. For instance, gold mixed with copper will form rose gold. Gold occurs as nuggets or grains in rocks, underground “veins” and alluvial deposits.
Platinum: Platinum is a chemical element with the symbol Pt and atomic number 78. A heavy, malleable, ductile, precious, grey-white transition metal, platinum is resistant to corrosion and occurs in some nickel and copper ores. Platinum is used in jewelry; laboratory equipment, electrical contacts, dentistry and automobile emissions control devices.
Silver: Silver is a chemical element with the symbol Ag and the atomic number 47. Silver has the highest electrical and thermal conductivity for a metal. It occurs as a free metal as well as various minerals such as argentite and chlorargyrite. Silver is mostly produced as a by-product of copper, gold, lead, and zinc mining. It is valued as a precious metal and is used in currency, ornaments, jewelry, and utensils. Today silver is also used in photographic film, electrical contacts and mirrors.
Stainless Steel: Stainless steel is very corrosion resistant, strong, and ductile. Stainless steel contains a minimum of 11 % chromium, as well as nickel and other alloying elements. In presence of oxygen a thin, hard adherent film of chromium oxide develops on the surface. The film protects the metal from corrosion. The film builds up again if the surface is scratched.
Titanium: Pure titanium has excellent corrosion resistance and a high strength-to-weight ratio at both room and elevated temperatures. This makes titanium attractive for applications including aircraft, jet engines, racing cars, as well as chemical and marine components. Properties like workability, strength and hardenability, can be improved by adding alloying elements. The most common are aluminum, vanadium, molybdenum and manganese.
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