Platinum Alloys

Platinum Alloys

 

alloys (usually binary alloys) based on platinum; usually solid solutions of the alloying element in platinum. The most important alloying elements in platinum alloys are metals of Group VIII of the Mendeleev periodic system (rhodium, iridium, palladium, ruthenium, nickel, and cobalt), as well as copper, tungsten, and molybdenum.

Platinum alloys are characterized by a high melting point; good corrosion resistance in many aggressive media, particularly by high oxidation resistance at high temperatures; and good mechanical properties and wear resistance. Several platinum alloys have catalytic action in oxidation, hydrogenation, and iso-merization reactions. Most platinum alloys are suitable for pressure working; objects made of them may be produced by forging, rolling, drawing, and stamping.

Platinum alloys are used in the production of thermocouples (5–40 percent Rh); break and sliding contacts (10–25 percent Rh or 5–15 percent Ru, 5–30 percent Ir, 10–20 percent Pd, or 5 percent Ni); parts for small, critical instruments, such as potentiometers (4–8 percent W or 3–10 percent Cu, 10–20 percent Ir, 10 percent Ru, or 5–10 percent Mo); springs and spring elements (25–30 percent Ir); permanent magnets (23 percent Co); and high-temperature solders (10–20 percent Pd).

Platinum alloys are used as catalysts in the oxidation of ammonia to nitric acid and in the production of prussic acid from ammonia and methane (5–10 percent Rh or 3–5 percent Pd and 3–5 percent Rh), insoluble anodes (5 percent Ir or 20–50 percent Pd), material for glass-melting vessels and dies for the production of viscose fiber (3–10 percent Rh), laboratory ware and apparatus (1–30 percent Rh, 5 percent Ir, or 10 percent Ru), and heaters for high-temperature furnaces (10–40 percent Rh).

I. A. ROGEL’BERG

References in periodicals archive ?
According to the State Statistical Office, the most exported products were catalysts with precious metals, ferronickel, car parts, products made of iron and steel, and apparel, while the most imported ones included oil derivatives, platinum and platinum alloys, electricity and other metals of the platinum group.
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Current fuel cells use platinum and platinum alloys as a catalyst.
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Arttech Casting casts the typical gold, silver and platinum alloys but also offers a line of metals it calls de-ox alloys.
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The most imported products in the first four months of 2014 were catalysts, ferrosilicon, ferro-nickel, car parts, products of iron and steel and clothing, while the most imported goods included crude oil, electricity, platinum and unprocessed or powder platinum alloys, and other metals of the platinum group.
In the imports, the most significant products are platinum and platinum alloys, unwrought or in powder form, the crude petroleum oils, nickel ores and concentrates and electricity.