发明名称 |
HEAT-RESISTANT Ni-ALLOY MATERIAL EXCELLENT IN RESISTANCE TO OXIDATION AT HIGH TEMPERATURE |
摘要 |
A composite resistive to high-temperature corrosion and abnormal oxidization, maintains original excellent high-temperature characteristics of Ni alloys over a long period of time, and suitable for applications in a high-temperature such as gas turbines, jet engines, and elements for exhaust-gas systems. A heat-resistant Ni-alloy composite has excellent high-temperature oxidation resistance, including a Ni-alloy substrate that has been subjected to an Al-diffusing treatment. The surface coat has a multi-layer structure including an inner layer composed of an alpha-Cr phase and an outer layer composed of a beta phase (Ni-Al-Cr) and a gamma' phase (Ni<SUB>3</SUB>Al(Cr)) on the substrate surface. The Al content in the outer layer is at least 20 atomic percent. The alpha-Cr phase functions as a diffusion-barrier layer. The outer layer retains and secures a high Al content required for self-regeneration of a defective portion of the Al<SUB>2</SUB>O<SUB>3 </SUB>layer damaged in an operating condition. |
申请公布号 |
EP1493844(A4) |
申请公布日期 |
2007.08.15 |
申请号 |
EP20030743620 |
申请日期 |
2003.03.05 |
申请人 |
JAPAN SCIENCE AND TECHNOLOGY AGENCY |
发明人 |
NARITA, TOSHIO;YOSHIDA, DAISUKE |
分类号 |
C23C10/02;C23C28/02;C22C19/03;C22C19/05;C23C10/48;C23C10/60;F01D5/28 |
主分类号 |
C23C10/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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