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 ?
Each alloy can be clad to core materials such as copper or copper alloys, niobium, molybdenum, MP35N[R] and Ni-Co-Cr-Mo alloys, nitinol and nickel-titanium alloys, platinum alloys or platinum-iridium, silver, stainless steel (302, 304V, 316LVM), tantalum or tantalum-tungsten alloys, and titanium or titanium alloys.
The most imported products were platinum and platinum alloys, unprocessed or powder, petroleum oils and oils obtained from bituminous minerals (other than crude), electricity, and other metals of the platinum group and their alloys.
In the imports, the most significant products are the petroleum oils and oils obtained from bituminous minerals (other than crude), platinum and platinum alloys, unwrought or in powder form, iron and steel products (flat-rolled products) and electricity.
This approach can work for pure platinum, but also platinum alloys, palladium and really any noble metal," says Sun.
Current fuel cells use platinum and platinum alloys as a catalyst.
But the raft of extras fitted including black milano leather satnav, Micrometallic platinum alloys bumped the price up to a staggering pounds 32,140.
Vacuum-arc remelting of platinum and platinum alloys with a consumable electrode allows reducing content of oxygen 5 times, carbon and nitrogen 9 times, fluorine, magnesium, chlorine, sulfur, calcium, iron, zinc, brome, arsenic, antimony, barium and lead by one order and more, but content of copper remains high.
Arttech Casting casts the typical gold, silver and platinum alloys but also offers a line of metals it calls de-ox alloys.
It's high driving position, sturdy and aggressive lines and 17in Rogue Platinum alloys give it an impressive look.
manufactures high tensile strength platinum alloys for PTCA (Percutaneous Transluminal Coronary Angioplasty) and cardiovascular applications where an exceptionally high degree of wire quality must be maintained.
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