FIELD: machine-tool industry. SUBSTANCE: initially mixture of graphite-like boron nitride, mixture of powders of alkaline and alkaline-earth metals or of their nitrides at molar ratio 1:0.5:0.5 (its quantity being 5-17 mass ) and metallic zinc (its quantity being 0.5-5 mass) is prepared. Thus prepared mixture is affected by heat treatment within 1-2 h at 600-900 C. Then compressing, affection by 35-50 kbar static pressure at 1100-1400 C and sustaining at 60-180 C are carried out. Yield of crystalline boron nitride is 43-57 size of its crystalline grain being 40-80 μm. EFFECT: improves efficiency of method. 2 cl, 1 tbl
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