| 摘要 |
PROBLEM TO BE SOLVED: To provide rocket parts with excellent durability having a carbon-doped titanium oxide layer doped with carbon under a Ti-C bounded condition having excellent durability and functioning as a visible light response type photocatalyst. SOLUTION: The surface on an ultrasonic output side end at least whose surface layer is made of titanium, a titanium alloy, titanium alloy oxide or titanium oxide, is heat-treated in a manner that the surface temperature on the ultrasonic output side end becomes 900 to 1500°C in a combustion gas atmosphere of gas mainly composed of hydrocarbon, or by directly applying combustion flame of gas mainly composed of hydrocarbon to the surface of the ultrasonic output side end. COPYRIGHT: (C)2006,JPO&NCIPI
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