William F. Waller AMITPP AssIRefEng (eds.)'s Electronics Design Materials PDF

By William F. Waller AMITPP AssIRefEng (eds.)

ISBN-10: 1349011762

ISBN-13: 9781349011766

ISBN-10: 1349011789

ISBN-13: 9781349011780

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Fig. 3. Variation of elastjc modulus with temperature. J "'EE <( 0: UJ ..... ::!!! a. i<: i= - u. :o - 0 250 1250 33 Silver Gold Platinum Iridium Osmium Palladium Rhodium Ruthenium Rhenium 1·75 37·4-37·9 130-135 150-155 200-223 36-38 205-210 50-55 £550/kg $ $ $ $ $ $ $ $ Table 1. Producer prices of the noble metals in London, at the end of 1970 (per oz troy). Table 2. Properties of the platinum metals and of rhenium.

Effect of precipitation-hardening upon gold-platinum alloys aged at 550°C after solution treatment for thirty minutes at 1 100-1 200°C. 500 Iridium-platinum alloys oxidise very rapidly when heated in · air and are unsuited therefore for high-temperature applications. They are however very valuable for instrument technology; electrical contact applications account for a high proportion of the iridium-platinum alloys supplied to industry. The high hardness and low contact resistance of the 10% and 20% iridium alloys renders them particularly suitable for low-current low-pressure applications.

When the contact must form a link in a magnetic circuit it is best employed in the magnetically soft, disordered, condition. Because of their resistance to corrosion, cobalt-platinum magnets can be employed in flow meters handling corrosive liquids and for the magnetic jigs used in electroplating baths. Whatever application is envisaged the alloy is most effectively employed with a length to diameter ratio of 0. 7. This must be compared with a ratio of 5 for Alnico V and 2 for Alnico VII. Although cobalt-platinum in the magnetically soft condition is ductile and readily worked it becomes very hard when heat treated for optimum magnetic properties.

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Electronics Design Materials by William F. Waller AMITPP AssIRefEng (eds.)

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