Kabushiki Kaisha Toshiba

Tokyo Shibaura Denki Kabushiki Kaisha

Tokyo Shibaura Electric Co., Ltd.

Yoshiharu Ochi

Takashi Ishigami

Hideo Ishihara

Masahiko Hirose

Kazumi Shimotori

Takenori Umeki

Takashi Fujita

Yasuhisa Shiraishi

Katsutarou Ichihara

Masatoshi Nakagawa

Tsuyoshi Yasui

Satoru Ozaki

Kazuo Matsumura

Disclosed is a highly pure titanium which comprises containing not more than 200 ppm of oxygen; not more than 30 ppm each of elements consisting of iron, nickel and chromium, and not more than 0.1 ppm each of elements consisting of sodium and potassium. Disclosed is also a process for preparing the above highly pure titanium which comprises melting a crude titanium obtained by molten salt electrolysis, in a high vacuum of 5.times.10.sup.-5 mbar or less.

Highly pure titanium

Highly pure titanium and process for producing the same

An ornament coated with silicon carbide having black luster which has been formed by chemical vapor deposition aided by D.C. glow discharge using hydrogen, a silicon compound and a hydrocarbon. The black ornament according to the present invention is very suitable for a case of a watch, a frame of eyeglasses and so on.

Black ornament

There is disclosed a method for forming a decorative metallic nitride coating on the surface of a substrate comprising the steps of disposing said substrate to be coated as a cathode in a material gas atmosphere at a pressure of 0.1 to 10 Torr, with said substrate maintained at a temperature of 200.degree. to 1000.degree. C., and applying a voltage of 200 to 8000 V to said substrate to prepare a direct current glow discharge space in the vicinity of said substrate, the improvement which comprises using as said material gas a mixed gas of a halide of titanium, zirconium or hafnium; hydrogen; and nitrogen, and controlling the current density of the electric current flowing through said substrate to be within the range of 0.01 to 1 mA/cm.sup.2. The method according to the present invention provides a uniform and beautiful metallic nitride coating which has a metallic luster stable with time, is excellent in mar resistance, and is suitable for decoration. Further, according to the method of this invention, a decorative metallic nitride coating capable of varying a tone on a metallic luster surface over a wide range can be formed.

Method of forming a decorative metallic nitride coating

A nuclear fuel element comprising a fuel body formed of nuclear fuel material and a clad for covering the fuel body. The clad is formed of an austenitic stainless steel containing silicon, titanium and carbon, respectively, in a controlled quantity.

Nuclear fuel element

Growing community of inventors

Ichihara, Japan

Yoshiharu Ochi