Casio Computer Co., Ltd.

Shouta Nagasawa

Junichi Sato

Kazuma Kobayashi

Kenichi Inoue

Chinfu Liu

Wuchien Liu

Tienchai Lin

Weipin Kao

The present disclosure relates to a titanium or titanium alloy member and to a surface hardening method for the titanium or titanium alloy member. The titanium or titanium alloy member includes a base material of titanium or titanium alloy, and at a surface of the base material, a hardened layer formed by diffusion of oxygen into the surface.

Alloy member and method for hardening surface thereof

The present disclosure relates to a titanium or titanium alloy member and to a surface hardening method for the titanium or titanium alloy member. The titanium or titanium alloy member includes a base material of titanium or titanium alloy, and at a surface of the base material, a hardened layer formed by diffusion of oxygen into the surface. The method includes: a heating step of heating the titanium or titanium alloy base material of the member to a predetermined temperature under an inert gas atmosphere; a hardening step of introducing (i) a mixed gas including an inert gas, and (ii) oxygen gas as a hardening treatment gas, to perform hardening treatment of the surface of the base material; and a cooling step of cooling the base material down to room temperature under the inert gas atmosphere.

A case including a case body, and an exterior member which is arranged on an outer periphery of the case body in a manner to be deformable in a circumferential direction and which is provided with a separation section for separating at least a part of the case body in the circumferential direction.

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Machida, Japan

Shouta Nagasawa