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|1. (WO2018128160) ALLOY MEMBER AND METHOD FOR HARDENING SURFACE THEREOF|
|Applicants:||CASIO COMPUTER CO., LTD.
|Title:||ALLOY MEMBER AND METHOD FOR HARDENING SURFACE THEREOF|
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.