Agency of Industrial Science and Technology

Denki Kagaku Kogyo Kabushiki Kaisha

Hiroaki Yasunaga

Kazuo Kobayashi

Ichitaro Ogawa

Hisayoshi Yoshida

Hiroshi Nishikawa

Hiroshi Harada

Hagio Tsuyoshi

A pressureless sintered body of boron nitride contains more than 95 wt% of boron nitride. The pressureless sintered body hexagonal of boron nitride has a density of not less than 1.10 g/cm.sup.3 and a bending strength of not less than 300 kg/cm.sup.2. A process of producing the pressureless sintered body of boron nitride comprises pulverizing powders of starting feed boron nitride so that a specific surface area of each of the powders is two times or more than that of the starting feed boron nitride powder, molding the thus pulverized powders to obtain a pre-molded body and sintering the pre-molded body at a temperature of not less than 1400.degree. C. under atmospheric pressure and under non-oxidative atmosphere.

Pressureless sintered body of boron nitride

Growing community of inventors

Omuta, Japan

Hiroaki Yasunaga