Stock material or miscellaneous articles – All metal or with adjacent metals – Having composition – density – or hardness gradient
Patent
1997-03-28
2000-06-06
Thibodeau, Paul
Stock material or miscellaneous articles
All metal or with adjacent metals
Having composition, density, or hardness gradient
428612, 428621, 428622, 428623, 428632, 428667, 428469, 428472, B22D 2500, B21B 100, B21D 3900
Patent
active
060716274
ABSTRACT:
A ceramic coating layer which is not less than 70 .mu.m in the maximum height Rmax of its profile curves and not less than 45 .mu.m in the 10-point average roughness, or which is less than 650 HV in Vickers hardness is provided on a metallic substrate. A heat-resistant member of such composition is excellent in thermal fatigue resistance and keeps an excellent heat resistance for a long period of time. Quality of a heat-resistant member is evaluated by, measuring at least one of roughness and hardness of a ceramic coating layer on a metallic substrate. According to this method, it is possible to easily and accurately evaluate a thermal resistant life of a heat-resistant member.
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Inagaki Hiroki
Nakahashi Masako
Suenaga Seiichi
Wada Kunihiko
Yasuda Kazuhiro
Kabushiki Kaisha Toshiba
Rickman Holly C.
Thibodeau Paul
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