| 摘要 |
FIELD: construction. ^ SUBSTANCE: charge is prepared, containing the following components, mol. %: SiC - 53-62, BN - 3-7, Al - 35-40, at the same time the rated quantity of aluminium is introduced in it in full volume, doing mechanical activation. Primary stocks are shaped from the charge, dried, exposed to vacuum sintering and grinding. After the secondary shaping the stocks are dried, sintered in vacuum, nitrified at the temperature of 1050C, and thermal treatment is carried out at 1400C. Vacuum sintering is carried out at the temperature of 11502C. The produced structural ceramic material is characterised by higher density and strength: withstands compression stress of at least 450 MPa, bending stress - of at least 130 MPa at high working temperatures of the material (at least 1400C). Shrinkage at the stage of cermet conversion into ceramics - not more than 0.5%. ^ EFFECT: reduced shrinkage. |
