Direct conversion process for making cubic boron nitride from py

Details Direct conversion process for making cubic boron nitride from py Direct conversion process for making cubic boron nitride from py

1977-07-01

1980-02-12

Arnold, Donald J.

Abrasive tool making process, material, or composition

With inorganic material

51309, 264 65, 423290, B24D 304

Patent

active

041881940

ABSTRACT:
A process for making a sintered polycrystalline cubic boron nitride (CBN) compact by direct conversion of a pyrolytic, preferably substrate nucleated, boron nitride (PBN). Direct conversion takes place by subjecting the PBN to temperatures and pressures within the CBN stable region. The crystallites of the compact produced by this process are preferentially oriented. Also, such compacts have a high thermal conductivity between about 2 watts/cm.degree. K. and 9 watts/cm.degree. K. and thus are useful as a heat sink for electronic devices. The size of the CBN crystallites of the compact may be between about 1.times.10.sup.3 A to 1.times.10.sup.5 A.

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