Osaka Prefecture

Tanaka Limited

Sdc Incorporated

Kei Demizu

Shinichi Tanaka

Yukihiro Sato

Takumi Sone

Koichi Tanaka

Noriyoshi Tsuji

Tetsuhiro Sakata

Sachio Nagata

Eiichi Ishii

Hideo Kakutani

A method of carburizing treatment is proposed in which if carburizing is carried out at a low temperature, carbon will not turn amorphose and deposit on the surface of a titanium metal but reliably penetrate into between metallic atoms. It is a method of surface treatment of a titanium metal comprising the steps of heating the titanium metal to a temperature of 400-690&#xb0; C. in a cleaning gas atmosphere containing hydrogen gas, subjecting the surface of the titanium metal to cleaning by applying a DC voltage of 200-1500 V, and plasma carburizing in an atmosphere comprising a carburizing gas having an atomic weight ratio of hydrogen atoms (H) to carbon atoms (C) adjusted to 1&#x2266;H/C&#x2266;9 at a pressure of 13-400 Pa and a temperature of 400-690&#xb0; C. Ionization reaction in the gas is suppressed suitably. Because there exists no excessive carbon which is not used for carburization but turns soot or glass-like carbon, in the atmosphere during carburization, carburizing reaction progresses smoothly.

Method of surface treatment of titanium metal

The surface of titanium is treated to reduce the friction coefficient and wear loss without sacrificing its corrosion resistance. Pure titanium or titanium alloy is subjected to plasma-carburizing in an atmosphere containing hydrocarbon gas at a pressure of 0.5 to 15 Torr and a temperature of 700.degree. to 1100.degree. C.

Method of treating the surface of titanium

Growing community of inventors

Osaka, Japan

Kei Demizu