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platinum contact alloys

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Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003150
EISBN: 978-1-62708-199-3
..., or mechanical means. The required purity of platinum may vary according to the end use or application. Although commercial-grade platinum must be at least 99.8% pure, platinum with a purity of at least 99.9% is required for alloying, laboratory ware, and contacts. Platinum of even higher purity, sometimes...
Book Chapter

Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001087
EISBN: 978-1-62708-162-7
... in various processes; for example, widely used agricultural fertilizers are produced with the aid of a platinum-rhodium alloy catalyst woven in the form of gauze, and auto emissions are reduced through the use of platinum-group alloy catalysts. Electrical contacts containing palladium are essential...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001097
EISBN: 978-1-62708-162-7
... on other contact materials—notably, copper and copper-base materials. Other types of contacts used include the platinum group metals, tungsten, molybdenum, copper, copper alloys, and mercury. Aluminum is generally a poor contact material because it oxidizes readily, but is used in some contact applications...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001088
EISBN: 978-1-62708-162-7
...% Ag was used for U.S. silver coins and is used for electrical contacts operating under service conditions where pure silver is considered too soft and is more likely to pit. The 28% Cu eutectic alloy finds some use as a brazing or soldering alloy. With heavy cold work, it is quite strong and is used...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006259
EISBN: 978-1-62708-169-6
... eutectic 150 550 80 1 100 350 50 15 Platinum Group Metal (PGM) Binary Alloys These alloys find critical use in the medical device, automotive, aerospace, electrical contacts, electronic, and sensor industries. Palladium, iridium, and rhodium show solubility in platinum for the entire...
Image
Published: 01 January 1990
combination with a spherical surface shows considerably longer life than some other combinations of silver sintered products; it did not weld in 100 operations. 24 V dc, 100 A: Shown is the scatter of contact potential after 200,000 operations for several samples of different alloy combinations. Under More
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003157
EISBN: 978-1-62708-199-3
... of impacted dirt, with a sulfide film acting as a dirt catcher. For many applications, silver is too soft to give acceptable mechanical wear. Alloying additions of copper, cadmium, platinum, palladium, gold, and other elements are effective in increasing the hardness and modifying the contact behavior...
Image
Published: 01 January 1990
Fig. 16 Effect of composition and polarity on life of some platinum and palladium alloy contacts actuated by a bimetal element. Sustained arcing affects the bimetal, thus indicating effectiveness of contact combinations by time for 100 operations. More
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001254
EISBN: 978-1-62708-170-2
... Abstract The electroplating of platinum-group metals (PGMs) from aqueous electrolytes for engineering applications is limited principally to palladium and, to a lesser extent, to platinum, rhodium, and thin layers of ruthenium. This article provides a discussion on the plating operations...
Image
Published: 01 January 1990
Fig. 2 Hardness and electrical resistivity versus alloy content for platinum contacts More
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003829
EISBN: 978-1-62708-183-2
... and alloys. The available information on the corrosion resistance of each element varies widely. Generally, more data are available for the more abundant, more easily fabricated elements. Silver and platinum have been evaluated in more environments than the other elements. Conversely, very little data...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005445
EISBN: 978-1-62708-196-2
... steels and alloys; thermostat metals; electrical contact materials; and magnetically soft materials. electrical conductivity electrical resistivity aluminum aluminum alloys copper copper alloys electrical heating alloys relay steel thermostat metal electrical contact materials...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003776
EISBN: 978-1-62708-177-1
... micrographs, comparing and contrasting the microstructural features of gold, platinum, iridium, palladium, and ruthenium-base alloys. It examines pure gold, intermetallic gold compounds, gold and platinum jewelry alloys, platinum-containing shape memory alloys, and alloys consisting of platinum, aluminum...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001098
EISBN: 978-1-62708-162-7
... because of its versatility and low cost. In this couple, the positive thermoelement is iron and the negative thermoelement is constantan, a 44Ni-55Cu alloy. As shown in Fig. 4 , the emf of iron is positive with reference to platinum, but the emf of constantan is the most negative with respect to platinum...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001454
EISBN: 978-1-62708-173-3
... then be employed. Another very common silver contact alloy is coin silver (90Ag-10Cu). Sterling silver (92.SAg-7.5Cu) is well-known for its application in jewelry, flatware, and decorative household serving utensils. The platinum-group metals are platinum, palladium, iridium, rhodium, ruthenium, and osmium...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006017
EISBN: 978-1-62708-175-7
... historical developments in powder metallurgy Date Development Origin 3000 B.C. “Sponge iron” for making tools Egypt, Africa, India 1200 A.D. Cementing platinum grains South America (Incas) 1781 Fusible platinum-arsenic alloy France, Germany 1790 Production of platinum-arsenic...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003834
EISBN: 978-1-62708-183-2
... with selectively clad (inlay) precious metals for low electrical contact resistance and high reliability. Clad metals can provide properties not available in a monolithic material at any cost. The best example is thermostat bimetals. An alloy with a high coefficient of thermal expansion is clad to an alloy...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005670
EISBN: 978-1-62708-198-6
... modern stents noble metals osmium palladium physical properties platinum precious metals rhodium ruthenium traditional amalgam alloys THE FOCUS of this article is a review of noble and precious metal use for biomedical applications. The noble metals include gold, platinum, palladium...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005745
EISBN: 978-1-62708-171-9
... of the areas associated with production and transfer of molten glass. Precious Metals Precious metals such as platinum and certain of their alloys are used extensively for long-term contact with molten glass. The industry is possibly the single largest consumer of platinum and is accustomed to measuring...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001249
EISBN: 978-1-62708-170-2
... of the specifications, standards, and hazards of indium plating. electrodeposition hazards indium indium alloys indium plating nonaqueous indium plating baths stripping INDIUM is a soft, low-melting-point, silvery white metal with a brilliant metallic luster and a color resembling that of platinum...