THE PHASE CONTENT TAILORING FOR THE MATERIAL MADE OUT OF SILICON ALKOXIDE-MODIFIED HIGH-MELTING AGGREGATE AND SOL-GEL COMPOSITION

Abstract

The creation of ceramics and refractories with improved physical and mechanical properties is possible on base of nanomaterials application in their technology. It is proposed to dope the ceramic materials batches with SiC nanoparticles with the help of modified powder aggregates. The tetraethoxysilane-assisted modification when grinding results in the powder's lattice disturbance and mechanochemical synthesis of SiC. The amount of synthesized p-SiC depends on the quantity of the modifying addition. The modified aggregate's phase compositions both before and after heat treatment at 1000 °C are given in the article, the thermal stability of mechanochemically synthesized SiC is defined. It is shown that the sintering of modified electrocorundum declines with the increasing of synthesized silicon carbide nanoparticles amount. Also the difference is shown in the phase composition's forming under the heat treatments of modified mixture and of conventional thin ground electrocorundum with sol-gel binder burnt at 1000 °С. The amount of synthesized silicon carbide nanoparticles in both cases is less than 5-7 %. The directions are provided for using the corundum aggregate with various amount of modified additions. Ill. 6. Ref. 8. Tab. 2.