Method of production of cubic boron nitride-containing high-dens

Details Method of production of cubic boron nitride-containing high-dens Method of production of cubic boron nitride-containing high-dens

1989-11-15

1991-08-27

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501102, 501126, 501127, 501153, 501154, 501103, 264 65, C04B 3558

Patent

active

050433040

ABSTRACT:
A cubic boron nitride-containing high-density inorganic composite sintered article is produced by a method which essentially consists of preparing a mixture of a cubic boron nitride powder with an inorganic compound powder capable of forming a high-rigidity sintered article under the conditions permitting the cubic boron nitride to remain in a substantially metastable, though not thermodynamically stable, state, a mixture of an inorganic compound-coated cubic boron nitride powder with an inorganic compound powder, or an inorganic compound-coated cubic boron nitride powder, and sintering the mixture of the cubic boron nitride powder with an inorganic compound powder, the mixture of the inorganic compound-coated cubic boron nitride powder with an inorganic compound powder or an inorganic compound-coated cubic boron nitrides powder, under the conditions of not more than 2,000 MPa of pressure and not more than 1,500.degree. C. of temperature for permitting the cubic boron nitride to remain in a substantially metastable, though not thermodynamically stable, state for a period incapable of causing conversion of the cBN into a graphite-type phase.

REFERENCES:
patent: 4587225 (1986-05-01), Tsukuma et al.
Journal of the Ceramic Society of Japan, 1981, pp. 45-49, T. Yamada et al., "Fabrication of Tin by Hot Isostatic Pressing".

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