Method for production of cubic boron nitride-containing high-den

Details Method for production of cubic boron nitride-containing high-den Method for production of cubic boron nitride-containing high-den

1991-04-25

1992-07-21

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

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

Patent

active

051322455

ABSTRACT:
A cubic boron nitride-containing high-density inorganic composite is prepared by mixing cubic boron nitride with a powdered inorganic compound capable of forming a rigid sintered article having a density of at least 85% and a Vickers hardness of at least 800, which does not promote the conversion of cubic boron nitride into graphite-type phase boron nitride (hBN). The powder mixture is compressed into a mold, and fired at low pressure of between 1,000-2,000 MPa, at a temperature of not more than 1,500.degree. C., under which conditions the cubic boron nitride does not convert to hBN, but is sufficiently metastable to permit the formation of the high-density inorganic composite.

REFERENCES:
patent: 4587225 (1986-05-01), Tsukuma et al.
patent: 5043304 (1991-08-01), Yoshida et al.

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