Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Reexamination Certificate
2007-10-23
2007-10-23
Lavilla, Michael E. (Department: 1775)
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
C428S667000, C428S680000
Reexamination Certificate
active
10506537
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 α-Cr phase and an outer layer composed of a β phase (Ni—Al—Cr) and a γ′ phase (Ni3Al(Cr)) on the substrate surface. The Al content in the outer layer is at least 20 atomic percent. The α-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 Al2O3layer damaged in an operating condition.
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Narita Toshio
Yoshida Daisuke
Japan Science and Technology Agency
Lavilla Michael E.
Westerman, Hattori, Daniels & Adrian , LLP.
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