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1. (WO2018128160) ALLOY MEMBER AND METHOD FOR HARDENING SURFACE THEREOF

Pub. No.:    WO/2018/128160    International Application No.:    PCT/JP2017/047224
Publication Date: Fri Jul 13 01:59:59 CEST 2018 International Filing Date: Fri Dec 29 00:59:59 CET 2017
IPC: C23C 8/12
C22F 1/00
C22F 1/18
Applicants: CASIO COMPUTER CO., LTD.
カシオ計算機株式会社
Inventors: SATO, Junichi
佐藤 順一
KOBAYASHI, Kazuma
小林 和真
NAGASAWA, Shouta
長澤 翔太
INOUE, Kenichi
井上 憲一
LIU, Chinfu
劉 金福
LIU, Wuchien
劉 伍健
LIN, Tienchai
林 天財
KAO, Weipin
高 偉賓
Title: ALLOY MEMBER AND METHOD FOR HARDENING SURFACE THEREOF
Abstract:
The present invention relates to a titanium or titanium alloy member and a method for hardening the surface of the titanium or titanium alloy member. The titanium or titanium alloy member is provided with a titanium or titanium alloy base material and a hardened layer which is formed on a surface of the base material as a result of oxygen diffusing to such surface. This method includes: a heating step of heating the titanium or titanium alloy base material of the member to a prescribed temperature in an inert gas atmosphere; a hardening step of introducing a mixed gas containing an inert gas and oxygen gas as a hardening treatment gas at a prescribed temperature and subjecting the surface of the base material to a hardening treatment; and a cooling step of cooling the base material to room temperature in an inert gas atmosphere.