Heat-resistant nickel-alloy composite excellent in high-temperature oxidation resistance
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United States of America Patent
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Oct 23, 2007
Grant Date -
Jul 14, 2005
app pub date -
Mar 5, 2003
filing date -
Mar 5, 2002
priority date (Note) -
Expired
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Abstract
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.3Al(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.2O.sub.3 layer damaged in an operating condition.
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