High temperature heat-treating jig

摘要

This specification discloses a high temperature heat-treating jig comprising a heat-resistant base, characterised by a refractory metal or refractory metal alloy layer formed on the surface of the heat-resistant base. The surface layer, preferably of tungsten or tungsten alloy, and preferably at least 0.2 micrometer thick, may be formed by thermal diffusion or vapour deposition and dispersion.