SIALON-CONTAINING MATERIAL AND COMPOSITION FOR ITS PREPARATION Russian patent published in 2009 - IPC C04B35/599 C04B35/569 

FIELD: chemistry.

SUBSTANCE: invention refers to the compounds and compositions for preparation of sialon-containing materials. The latter includes the following phases (wt %): β-sialon Si₃Al₃O₃N₅ 25-55%, α-sialon SiAl₄O₂N₄ 10-35%, cubic silicon carbide in nanodimensional state 3C-SiC 10-20% , hexagonal silicon carbide 6H-SiC 20-40% with particle size 5-50 mcm and yttrium aluminate Y₃AI₅O₁₂ 7-15%. The specified material is obtained from the following composition (wt %): sialon-containing powder with particle size not more than 150 nm 50-75, 6H-SiC (particle size 5-50 μ) 20-40, Y₂O₃ 5-10, where the sialon-containing powder contains the following phases (wt %): Si₃Al₃O₃N₅ 35-70, SiAl₄O₂N₄ 15-35, 3C-SiC 10-20, Al₂O₃ 5-10. The invention allows to obtain without hot-pressing the material with compressive resistance 620-1030 MPa, thermal conductivity at 100°C 40-88 W/(m·K) and total porosity 5-15%.

EFFECT: invention provides the material with enhanced fastness and thermal conductivity which can be used in high-temperature equipment eg in the design of heat-exchangers.

2 cl, 15 ex, 1 tbl