Kabushiki Kaisha Toshiba

Shunichiro Tanaka

Akio Sayano

Tsuneji Kameda

Yasuyuki Sugiura

Hiroyuki Ishizuka

A highly thermoconductive ceramic substrate, which is characterized by having formed on a ceramic substrate an electroconductive coating of a mixture of tungsten and/or molybdenum with the nitride of a transition metal belonging to Group IVa of the Periodic Table of Elements. As the ceramic substrate in the present invention, a non-oxide type ceramic substrate is used because of satisfactory strength. The formation of the electroconductive coating consisted preponderantly of a mixture of tungsten and/or molybdenum with the nitride of a metal belonging to Group IVa of the Periodic Table Elements is accomplished, for example, by preparing a metallizing composition in the form of a paste or solution containing a metal salt of tungstic acid or molybdic acid and a transition metal of Group IVa or a compound thereof, applying the metallizing composition on the ceramic substrate, heating the resulting composite, then firing the composite.

Highly thermoconductive ceramic

This invention relates to a metallizing composition capable of forming an electroconductive coating of satisfactory adherence properties on the surface of a sintered ceramic article, particularly on a sintered silicon nitride type ceramic article. The metallizing composition contains metal salts of tungstic acid and/or molybdic acid and a metal of Group IVb of the Periodic Table of Elements or a compound thereof. The electroconductive coating of high adherence properties is formed by applying the metallizing composition on a sintered ceramic article and drying the deposited layer of the composition in air, heating the dried layer, and firing the layer in a non-oxidizing atmosphere. The metallizing composition is suitable for the formation of the electroconductive coating on a complexly shaped sintered ceramic article such as, for example, on the inner surface of a hollow ceramic article.

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Yokohama, Japan

Shunichiro Tanaka