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oa Thermophysical Properties of L12 Intermetallic Compounds of Iridium
THERMAL CONDUCTIVITY AND THERMAL EXPANSION OF Ir3X FOR ULTRA HIGH-TEMPERATURE APPLICATIONS
- Source: Platinum Metals Review, Volume 52, Issue 4, Oct 2008, p. 208 - 214
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- 01 Jan 2008
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Abstract
Thermal conductivity and thermal expansion for the intermetallic compounds Ir3X (X = Ti, Zr, Hf, V, Nb or Ta) were measured in the temperature range between 300 and 1100 K. The thermal conductivities of Ir3X are distributed in the range from 41 to 99 W m–1K–1at 300 K, while the difference of thermal conductivities becomes less emphasised at higher temperatures. The coefficient of thermal expansion (CTE) values of Ir3X are insensitive to temperature, and fall around 8 × 10–6K–1at 800 K. The Ir3X intermetallic compounds with X = Ti, Zr, Hf, Nb or Ta are suitable for ultra high-temperature structural applications due to their higher thermal conductivities and smaller CTE values.
© Johnson Matthey