Agency of Industrial Science and Technology

Ministry of International Trade & Industry

Agency of Industrial Science and Technology Ministry of International

Yoshio Tasaki

Haruo Yoshida

Shoichi Kume

Michihide Machida

Kazutaka Suzuki

Shiro Ikuta

Masamitu Ishikawa

Hiroshi Kajihara

Noboru Nakayama

A sintered article of diamond is obtained by coating the surface of diamond particles with 30 to 0.1% by volume, based on the total volume of the diamond particles and aids, of at least one member selected from the group consisting of the transition metals of Groups 4a, 5a, and 6a in the Periodic Table of Elements and boron and silicon, and sintering the coated diamond particles under conditions of high pressure and high temperature, which sintered article consists of 70 to 99.8% by volume of diamond and 30 to 0.2% by volume of the carbide of the coating substance. A method for the production of the sintered article of diamond is also disclosed.

Sintered article of diamond and method for production thereof

Method for production of a sintered article of diamond

Disclosed herein is a portable frictional welding device whereby union of a metallic part with a given structure is accomplished by fastening said metallic part to the rotary shaft of the device supported slidably in the axial direction thereof, operating the rotary shaft so as to rotate the metallic part and at the same time pressing it against the structure and, when the point therebetween has assumed a state of fusion, stopping the rotation of the rotary shaft and simultaneously increasing the thrust being applied to said structure.

Portable frictional welding device

Growing community of inventors

Nagoya, Japan

Yoshio Tasaki