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Open Access Thermophysical Properties of L1 2 Intermetallic Compounds of Iridium

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Thermal conductivity and thermal expansion for the intermetallic compounds Ir 3 X (X = Ti, Zr, Hf, V, Nb or Ta) were measured in the temperature range between 300 and 1100 K. The thermal conductivities of Ir 3 X are distributed in the range from 41 to 99 W m 1 K 1 at 300 K, while the difference of thermal conductivities becomes less emphasised at higher temperatures. The coefficient of thermal expansion (CTE) values of Ir 3 X are insensitive to temperature, and fall around 8 × 10 6 K 1 at 800 K. The Ir 3 X 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.

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Document Type: Research Article

Publication date: October 1, 2008

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