Vaporization of Tantalum Carbide‐Hafnium Carbide Solid Solutions

Abstract

The vaporization rates in vacuum of hot‐pressed HfC, TaC, and solid solutions of these carbides in the range 2225° to 2725°C were determined by a Langmuir‐type method. A composition near 80TaC.ZOHfC (mole %) exhibited the lowest vaporization rate of the compositions within this pseudobinary system. Variations in initial sample bulk density and vapor‐specie condensa tion on the furnace wall have negligible effects on the measured vaporization rates.