Hitachi, Ltd.

Yukio Okoshi

Kunio Miyazaki

Shinichi Itoh

Hisanori Okamura

Takao Miwa

Toshio Miyamoto

Shunichi Numata

Koji Fujisaki

Ryuji Watanabe

Kousuke Nakamura

Osamu Miura

Akio Chiba

Tomio Yasuda

Takayoshi Ikeda

Hisae Shimanoki

Hirosi Akiyama

Mutuo Kamoshita

The present invention provides a process for producing a metal-polyimide composite material such as a wiring board. In production thereof, deterioration of polyamide film due to oxidation during imidization of a polyimide precursor in contact with metal such as copper or silver can be prevented. The present invention is characterized by using a polyimide precursor having an acidic functional group which is masked. Examples of the polyamide precursor are polyamic acid epoxy adducts, amido polyamic acids, silylated polyamic acids, etc.

Process for producing metal-polyimide composite article

The nuclear fusion reactor of the present invention presents a new vacuum vessel for enclosing plasma particles where a reactor wall exposed to the above plasma particles has a piled structure. A plurality of heat-resisting ceramic tiles are metallurgically bonded to a metal-base body having a cooling means through a brazing material. The ceramic tiles are preferably composed of sintered silicon carbide of high density and containing a little beryllium oxide between the boundaries of crystal grains.

Nuclear fusion reactor

Growing community of inventors

Mito, Japan

Yukio Okoshi