FIELD: production of technical ceramics. SUBSTANCE: initially nitride silicium material is affected by ultrasound treatment within 1-15 min at frequency 7-25 Hz. The process is carried out in water being acidified by nitric acid, it is followed by drying to humidity 0.2-1.5 %. Then impregnation by soles of ethyl silicate and/or compositions on the base of salts of silicium, yttrium, aluminium and ethyl silicate is carried out at (-4)-(+10) C within 12-52 h. Drying takes place at 15-25 C within 1-4 days, roasting is carried out at 1200 C in argon medium. EFFECT: improves efficiency of method. 1 tbl
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