Platinum group metals alloys

Magnetostriction of platinum-group metal and platinum-group metal alloys, expressed by the factor Si of proportionality according to M/l = SiH [1.217,... 

Platinum has many uses in dentistry. Pure platinum foil serves as the matrix in the constmction of fused-porcelain restorations. Platinum foil may be laminated with gold foil for cold-welded foil restorations. Platinum wire has found use as retention posts and pins in crown and bridge restorations. Heating elements and thermocouples in high-fusing porcelain furnaces are usually made of platinum or its alloys (see Platinum-GROUP metals). 

Electroplated Metals and Alloys. The metals electroplated on a commercial scale from specially formulated aqueous solutions iaclude cadmium, chromium, cobalt, copper, gold, iadium, iron, lead, nickel, platinum-group metals, silver, tin, and ziac. Although it is possible to electroplate some metals, such as aluminum, from nonaqueous solutions as well as some from molten salt baths, these processes appear to have achieved Httie commercial significance. 

JS/oble Metals. Noble or precious metals, ie, Pt, Pd, Ag, and Au, are ftequendy alloyed with the closely related metals, Ru, Rh, Os, and Ir (see Platinum-GROUP metals). These are usually supported on a metal oxide such as a-alumina, a-Al202, or siUca, Si02. The most frequently used precious metal components are platinum [7440-06-4J, Pt, palladium [7440-05-3] Pd, and rhodium [7440-16-6] Rh. The precious metals are more commonly used because of the abiUty to operate at lower temperatures. As a general rule, platinum is more active for the oxidation of paraffinic hydrocarbons palladium is more active for the oxidation of unsaturated hydrocarbons and CO (19). 

Precious metal. This means gold, silver, or platinum group metals, and the principal alloys of those metals. 

Gold occurs as an alloy with copper, nickel and platinum group metals. Typically contains low amount of gold... 

Corrosion reactions, 21 845 Corrosion resistance, 9 710 10 441 of copper wrought alloys, 7 742-744 of lead-calcium alloys, 14 774 of materials used with fluorine, 11 839 of platinum-group metals, 19 600, 601t of silver, 22 639... 

See also Potassium-sodium (NaK) alloys physical properties of, 20 604t Naked license, 25 265 AT-aldehydes, platinum-group metal catalysts and, 19 621 Naled, 4 358t... 

Platinum family metals and alloys. The platinum family (platinum group) metals (Ru, Os, Rh, Ir, Pd, Pt) belong (together with Au and possibly Ag and Re) to the class of precious metals. This characteristic together with their inertness to the environment (with regard to corrosion and oxidation) is the basis for a number of uses such as in the following. 

Osmium occurs in nature, always associated with other platinum group metals. It usually is found in lesser abundance than other noble metals. Its most important mineral is osmiridium (or iridosmine), a naturaUy occurring mineral alloyed with iridium. 

The properties of some rare-earth binary alloys with platinum group metals are also important in view of the role they can play in the chain of preparing ternary hydrides. Many of the alloys of the series R-M, where R is a rare earth element and M is a Group VIIIB metal, have been investigated structurally and magnetically. The alloys with iridium all have cubic structures, whereas those... 

Electrical connectors - [ELECTRICALCONNECTORS] (Vol 9) -palladium films as [PLATINUM-GROUP METALS, COMPOUNDS] (Vol 19) -polycarbonates for [POLYCARBONATES] (Vol 19) -use of copper [COPPER] (Vol 7) -use of tellurium alloys [TELLURIUM AND TELLURIUM COMPOUNDS] (Vol 23) -use of wrought copper alloys [COPPER ALLOYS - WROUGHT COPPER AND WROUGHT COPPER ALLOYS] (Vol 7) -use of wrought copper alloys [COPPER ALLOYS - WROUGHT COPPER AND WROUGHT COPPER ALLOYS] (Vol 7)... 

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