The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 07, 1998
Filed:
Nov. 13, 1995
Yoshiyuki Yasutomi, Mito, JP;
Shigeru Kikuchi, Tokai-mura, JP;
Yukio Saito, Hitachi, JP;
Mitsuo Nakagawa, Mito, JP;
Motoyuki Miyata, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The surface of a member formed of at least one kind of ceramics, metals and C/C composites, is covered with an outermost surface oxide covering layer having a stability against the environment in the atmospheric air at 1500.degree. C.; and a self-recoverable layer as an intermediate layer formed between the outermost surface oxide covering layer and the surface of the member. The self-recoverable layer has an oxidizing rate greater than that of the outermost surface covering layer for recovering cracks generated on the outermost surface covering layer, and a compound produced by the self-recoverable layer has the same phase as in the outermost surface covering layer. To achieve the optimum self-recovering function at high temperatures, the outermost surface oxide covering layer may be made of a stable oxide having a vapor pressure of 1.times.10.sup.-4 /m.sup.2 or less in the atmospheric air at 1500.degree. C., and the oxidized product material from the self-recoverable layer contains an oxide having the same composition as that of the outermost surface oxide covering layer.