Polycrystalline cubic boron nitride compact

Details Polycrystalline cubic boron nitride compact Polycrystalline cubic boron nitride compact

1984-10-30

1987-03-03

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

51307, 51309, 75244, C04B 3558

Patent

active

046475460

ABSTRACT:
The invention is a process for preparing a sintered polycrystalline compact of cubic boron nitride, the compact produced by the process, and articles comprising the compact. A mixture is formed of cubic boron nitride grains and from 5 to 20 volume percent of binder material, or sintering aid, consisting essentially of silicon and an aluminum-containing material selected from the group consisting of aluminum, aluminum nitride, aluminum diboride, and mixtures thereof. The mixture is subjected to elevated pressure and temperature conditions sufficient to melt the binder material and at which the boron nitride is thermodynamically stable. The elevated pressure and temperature conditions are maintained for a time sufficient to sinter the compact. The compact is characterized by substantial intergranular CBN-CBN bonding, and has superior wear and impact resistance, thermal conductivity and stability.

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Chem. Abstracts, vol. 72:139166p, from the Journal of the Ceramic Society of Japan, article by H. Saito, 1970.

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