Pressureless sintered body of boron nitride

Details Pressureless sintered body of boron nitride Pressureless sintered body of boron nitride

1990-03-27

1991-11-05

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 98, 423290, C04B 3558

Patent

active

050631845

ABSTRACT:
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.

REFERENCES:
patent: 4188194, Corrigan
patent: 4539300 (1985-09-01), Coblenz
patent: 4634640 (1987-01-01), Hunold et al.
patent: 4784978 (1988-11-01), Ogasawara et al.
patent: 4960734 (1990-10-01), Kanai et al.
Journal of Electron Spectroscopy and Related Phenomena, 27 (1982), pp. 234-254 of Jun Hosoi, Tetsuo Oikawa and Masao Inoue Title: "Study of Boron Nitride by Electron Energy Loss Spectroscopy".
Ann. Chim. Fr., 1985, vol. 10, pp. 607-638 by Eliezer Rapoport Title: "Cubic Boron Nitride-A Review".

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