| 摘要 |
A sliding surface of a high-temperature portion is subjected to an electro-discharge surface treatment with one or both of a high-temperature hard material ( 4 ) and a material having a lubricating property at a high temperature ( 6 ). The high-temperature hard material ( 4 ) is any or a mixture of cBN, TiC, TiN, TiAlN, TiB<SUB>2</SUB>, WC, Cr<SUB>3</SUB>C<SUB>2</SUB>, SiC, ZrC, VC, B<SUB>4</SUB>C, Si<SUB>3</SUB>N<SUB>4</SUB>, ZrO<SUB>2</SUB>, and Al<SUB>2</SUB>O<SUB>3</SUB>. The material having the lubricating property at the high temperature ( 6 ) contains chromium and/or chromium oxide (Cr<SUB>2</SUB>O<SUB>3</SUB>) and/or hexaboron nitride (hBN). An electrode formed by compression molding of the high-temperature-hard material, and the high-temperature lubricating material containing at least one of Cr and hBN and having the lubricating property at the high temperature is used as the electrode for the electro-discharge surface treatment.
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