Osaka University

Ntk Cutting Tools Co., Ltd.

Niterra Co., Ltd.

Yusuke Katsu

Hidetoshi Fujii

Yoshiaki Morisada

Jun Moteki

Tsuneyuki Ito

Hiroki Takeuchi

Shohei Takaku

Yuki Takeuchi

Yasushi Hara

A friction stir welding tool and a friction stir welding method that can increase the amount of heat generation, while reducing the amount of escaping heat are provided. The friction stir welding tool () has a shoulder portion () and a probe portion () provided on a bottom surface of the shoulder portion (). The base material of the friction stir welding tool () is a ceramic material whose main phase is silicon nitride or sialon. The shoulder portion () has a diameter of 35 mm or greater.

Friction stir welding tool and friction stir welding method

A friction stir welding tool () has a shoulder portion () and a probe portion () provided on a bottom surface of the shoulder portion (). The probe portion () has a length of 5.5 mm or more. In the friction stir welding tool (), a ceramic material whose main phase is silicon nitride or sialon is used as a base material.

In one aspect of the present disclosure, there is provided an optical wavelength conversion member including a polycrystalline ceramic sintered body containing, as main components, AlOcrystal grains and crystal grains represented by formula XAlO:Ce. In the optical wavelength conversion member, atoms of element X are present also in an AlOcrystal grain adjacent to the interface between the AlOcrystal grain and an XAlO:Ce crystal grain.

Light wavelength conversion member and light-emitting device

Growing community of inventors

Nagoya, Japan

Yusuke Katsu