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

By William F. Waller AMITPP AssIRefEng (eds.)

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The 20% rhodium-platinum and 25% rhodium-platinum alloys are extensively used for high-temperature applications in the glass industry, and also for furnace windings capable of operating in air up to 1 600°C. Fig. 13. Calibration curves of 1:i3, 5:20, 6:30 and 20:40% rhodium-platinum thermocouples compared with that of the standard 13% rhodium-platinum couple. 2000 20 1200"C IIOO"C IOOO"C u 900"C 0 ..... a: :::> aoo•c 1- ~ ..... 1oo•c Q. : ..... 1- soo•c 5oo·c 4oo•c 300"C 2oo•c IOO"C 100 40 5 10 EMF MILLIVOLTS 15 Rhodium-platinum alloys for temperature measurement Because of their extreme high-temperature stability rhodium-platinum alloys are used extensively for the manufacture of thermocouples.

By swaging in hydrogen at 1100°C area reductions of the order of 25-30% become As 1100°C is well below the possible. recrystallisation temperature for rhenium this process should be regarded as 'warm' rather than hot working and after passing through the swage the bar still Fig. 4. Increase of hardness caused by working. 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.

1- soo•c 5oo·c 4oo•c 300"C 2oo•c IOO"C 100 40 5 10 EMF MILLIVOLTS 15 Rhodium-platinum alloys for temperature measurement Because of their extreme high-temperature stability rhodium-platinum alloys are used extensively for the manufacture of thermocouples. The 10% rhodium-platinum versus platinum thermocouple was selected because of its stability by Chatelier in 1887(38) and is still widely used. The thermoelectric forces in millivolts generated between rhodium platinum alloys and pure platinum at various temperatures are plotted on Fig.

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