Thermophysical Properties of Rh3X for Ultra-High Temperature Applications
Authors: Terada, Yoshihiro; Ohkubo, Kenji; Miura, Seiji; Mohri, Tetsuo
Source: Platinum Metals Review, Volume 50, Number 2, April 2006 , pp. 69-76(8)
Publisher: Johnson Matthey
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Abstract:
Thermal conductivity and thermal expansion were measured for the L12 intermetallic compounds Rh3X (X = Ti, Zr, Hf, V, Nb, Ta) in the temperature range 300–1100 K to evaluate the feasibility of applying the compounds as ultra-high temperature structural materials. The thermal conductivities of Rh3X are widely distributed over the range 32–103 W m−1 K−1 at 300 K, but the differences between the thermal conductivities diminish at higher temperatures. A trend is observed in that the thermal conductivity of Rh3X is greater if the constituent X belongs to Group 5 rather than to Group 4 in the Periodic Table. The coefficient of thermal expansion (CTE) values of Rh3X increase slightly with increasing temperature; values are concentrated around 10 × 10−6 K−1 at 800 K. CTE values of Rh3X decrease as X appears lower in the Periodic Table. It is demonstrated that Rh3Nb and Rh3Ta are suitable for ultra-high temperature structural applications due to their higher thermal conductivities and smaller CTE values.Document Type: Research article
DOI: 10.1595/147106706X106182
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