2.13.1 Introduction

Zirconium carbide, like other carbides of the transi­tion metals of Groups IV, V, and VI, exhibits an

unusual combination of properties that are useful for refractory applications. These carbides combine the cohesive properties of covalently bonded ceramics (high melting point, high strength, and hardness) with the electronic properties of metals (high thermal and electrical conductivity). Comparative properties of the refractory transition metal carbides have been reviewed previously by Schwarzkopf and Kieffer,1

Storms,2 Toth,3 Kosolapova,4 and Upadhyaya.5 A thorough understanding of the thermodynamic and heat transport properties of carbides is limited by a paucity of experimental data as a function of composition.