Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1994-03-16
1996-07-02
Silverberg, Sam
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
148285, C23C 810, C23C 814, C22C 3806
Patent
active
055318371
ABSTRACT:
A method for increasing the oxidation resistance of a Fe-Cr-Al alloy, which comprises placing said Fe-Cr-Al alloy in an atmosphere having an oxygen partial atmosphere of 0.02-2 Pa at a temperature of 950.degree.-1,200.degree. C. to form, on the surface of said alloy, an alumina-based protective film having excellent oxidation resistance.
Said method enables the formation of a homogeneous protective film having excellent oxidation resistance, even on alloys having non-homogeneous compositions, such as Fe-Cr-Al alloy and the like, and is very effective for increasing the oxidation resistance of Fe-Cr-Al alloy.
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Patent Abstracts of Japan, vol. 12, No. 438, JP-A 63-162502 (A), Jul. 5, 1988.
Patent Abstracts of Japan, vol. 8, No. 67, JP-A 58-217677 (A), Dec. 17, 1983.
"Oxide Structure of Stainless Steels under Controlled Oxygen Atmospheres", Toshiyuki Yashiro, Heat Treatment, vol. 31, No. 4, pp. 205-211, 1991.
"Surface Modification of Stainless Steels Using Thermal Passivation", Toshiyuki Yashiro et al., Surface Technology vol. 41, No. 3, pp. 41-48, 1990.
Kurokawa Teruhisa
Ohashi Tsuneaki
Tsuno Nobuo
Kubovcik Ronald J.
NGK Insulators Ltd.
Silverberg Sam
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