- ISSN: 0032-1400
-
oa Thermophysical Properties of Rh3X for Ultra-High Temperature Applications
THERMAL CONDUCTIVITY AND THERMAL EXPANSION OF L12 INTERMETALLIC COMPOUNDS OF RHODIUM WITH TITANIUM, ZIRCONIUM, HAFNIUM, VANADIUM, NIOBIUM AND TANTALUM
- Source: Platinum Metals Review, Volume 50, Issue 2, Apr 2006, p. 69 - 76
-
- 01 Jan 2006
Abstract
Thermal conductivity and thermal expansion were measured for the L12 intermetallic compounds Rh3 X (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 Rh3 X 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.
