| 摘要 |
A raw material powder having particle sizes of not more than 125 mum and preferably not more than 75 mum, such as a powder of an alloy of Co-32% Ni-21% Cr-7.5% Al-0.5% Y is thermally sprayed onto surfaces of shroud members of a shroud to form a coating. The high velocity oxygen-fuel thermal spray method is used as the thermal spray method. In the obtained coating, the porosity is 5% to 30% by volume and the oxygen content is not more than 2% by weight. In particular, when the raw material powder has particle sizes of about 40 mum, it is possible to obtain the coating which has an extremely small oxygen content of about 0.5% by weight.
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