Abrasive compact of cubic boron nitride and method of making sam

Details Abrasive compact of cubic boron nitride and method of making sam Abrasive compact of cubic boron nitride and method of making sam

1992-11-18

1994-02-22

Bell, Mark L.

Abrasive tool making process, material, or composition

Miscellaneous

51308, 51309, 501 96, 501 97, B24D 300

Patent

active

052882977

ABSTRACT:
An abrasive compact comprising 40 to 90 volume percent of cubic boron nitride (CBN) crystals bonded by 60 to 10 volume percent of a bonding matrix comprised mainly of an intimate mixture of silicon nitride and metallic diboride MB.sub.2 where M represents metal atoms chosen from the group of titanium, zirconium and hafnium atoms. The compact may be produced by a method which comprises intimately mixing particulate CBN crystals with a bonding agent in the proportion 95 to 60 volume percent of CBN and 5 to 40 volume percent of bonding agent, the bonding agent containing the metal atoms in the atomic proportions Si.sub.30 M.sub.70 to Si.sub.85 M.sub.15, subjecting the mixture of CBN crystals and bonding agent to temperatures in the range 900.degree. to 1800.degree. C. and pressures in the range 5 to 70 Kilobars, and maintaining the temperature and pressure conditions for a period of at least about 30 seconds, sufficient to cause most of bonding agent to form the bonding matrix.

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