Heat-resistant member

A heat-resistant member, comprising:

• a substrate made of isotropic graphite;
• a single-layered dense low-emissivity layer covering part of surfaces of the substrate;
• and
• a single-layered or multi-layered dense high-emissivity layer covering all or part of the remaining surfaces of the substrate, wherein the dense low-emissivity layer has an outermost surface with an emissivity of εA, and has a relative density of 97% or more, and the dense high-emissivity layer has an outermost surface with an emissivity of εB (>εA), and has a high-density region with a relative density of 97% or more in any portion between the outermost surface and the interface with the substrate, wherein the dense low-emissivity layer includes TaC and/or WC and at least one of ZrC, Mo2C, and HfC and wherein the dense high-emissivity layer includes TaC and/or WC and at least one of ZrC, Mo2C, and HfC.

A heat-resistant member, comprising:

• a substrate made of isotropic graphite;
• a single-layered dense low-emissivity layer covering part of surfaces of the substrate;
• and
• a single-layered or multi-layered dense high-emissivity layer covering all or part of the remaining surfaces of the substrate, wherein the dense low-emissivity layer has an outermost surface with an emissivity of εA, and has a relative density of 97% or more, and the dense high-emissivity layer has an outermost surface with an emissivity of εB (>εA), and has a high-density region with a relative density of 97% or more in any portion between the outermost surface and the interface with the substrate, wherein the dense low-emissivity layer includes TaC and/or WC and at least one of ZrC, Mo2C, and HfC or wherein the dense high-emissivity layer includes TaC and/or WC and at least one of ZrC, Mo2C, and HfC.