Denki Kagaku Kogyo Kabushiki Kaisha

Mitsuaki Saito

Kenji Nomura

Hideki Hirotsuru

Akira Miyai

Suzuya Yamada

Masaji Ishii

Hirotoshi Hagiwara

Ryuichi Terasaki

Hiroaki Tanji

Kazuyuki Hiruta

Kenichi Ehara

Yoshiharu Mori

A silicon carbide composite which is a flat composite comprising a porous preform of silicon carbide and a metal containing aluminum as the main component, infiltrated into the porous preform, said composite having a warpage of at most 250 &mgr;m per 10 cm of the principal plane length of the composite.

Silicon carbide composite, method for producing it and heat dissipation device employing it

A thermionic cathode structure comprises two parallel thermionic electron emitter elements which are made of a heat resistant and electric conductive inorganic compound. Each of them has one end electrically closed and the other end functioning as a current feeding port.

Thermionic cathode structure

A thermionic cathode includes an electron emitting tip, lanthanum hexaboride tip supporting heaters in close contact with both sides of the tip and supporting the tip, and elastic electroconductive members in pressure contact with outer surfaces of the tip supporting heaters for supplying electric current. The tip supporting heaters are obtained by cutting lanthanum hexaboride having high anisotropy due to its layered structure so as to form a pair of parallel planes perpendicular to a pressing direction when hot-pressed, and abrade-polishing the parallel planes. The tip supporting heaters are brought into close contact with the tip and the elastic electroconductive members at the resulting smooth surfaces thereof. The apparatus of the invention has a prolonged lifetime and high efficiency.

Thermionic cathode apparatus

Growing community of inventors

Tokyo, Japan

Mitsuaki Saito