BN SINTERED COMPACT AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain a BN sintered compact allowed to develop a reddish-brown color. SOLUTION: This BN sintered compact has >=1×10<7> spin/g spin density measured by ESR and contains AlON. It is produced by subjecting a powdery starting material mixture contg. BN powder having 1-4wt.% oxygen content and 1-5wt.% metal Al powder to pressureless or hot press sintering at 1,800-2,200 deg.C after heating at >=250 deg.C/hr heating rate.