METHOD OF MAKING NON-SHRINKING STRUCTURAL CERAMIC ARTICLE Russian patent published in 2010 - IPC C04B35/569 C04B35/582 C04B35/65 

FIELD: chemistry.

SUBSTANCE: invention can be used to make articles from high-strength, non-shrinking ceramic materials working in high thermal-cycle loads in an oxidative, corrosive and aggressive atmosphere, and particularly in power generation installations. The starting material undergoes screening and deep cleaning. A mixture is prepared from components in the following ratio in mol %: boron nitride 12.5-17.5, aluminium 37-43, silicon carbide 42.5-46 and the mixture is mechanically activated. Primary workpieces are moulded from the mixture, dried and vacuum sintering is carried out at temperature between 1150 and 1250°C with residual pressure of 0.05 atm. The sintered workpieces are ground up and mechanically activated, after which articles are moulded and then vacuum sintered in conditions given above, mechanically processed, nitrogen hardened and oxidised.

EFFECT: stable and good properties of material along with low shrinkage.

5 cl, 3 ex, 1 tbl