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Ceramic bond c BN composites with large pores were prepared by firing at 740 ℃ for 1 h using Na2O-Al2O3-B2O3-SiO2 glass and c BN abrasives（ particles size 0.150 mm /0.124 mm） as main starting materials,c BN micro-particles（ particles size 0. 014 mm） as th