HIGH FILLABILITY HEXAGONAL BORON NITRIDE POWDER, ITS PRODUCTION AND USE THEREOF

摘要

PROBLEM TO BE SOLVED: To obtain hexagonal BN powder and to produce a high density hexagonal BN sintered compact having high strength and high purity of BN. SOLUTION: Hexagonal BN powder having >=30μm vol. average diameter Dv is pulverized by a pulverizing method not accompanied by grinding to obtain the objective high fillability hexagonal BN powder having a T value of <=0.5 represented by the ratio of area average diameter Da to vol. average diameter Dv. Starting material for producing a hexagonal BN sintered compact contg. 20-100wt.% of the obtd. BN powder and having 0.4-1.7wt.% oxygen content is sintered to obtain the objective hexagonal BN sintered compact.