TITANIZATION OF C/SiC COMPOSITE FIBERS IN KCl-LiCl-KTiF SALT MELT AND PRODUCTION OF CERAMICS FROM THEM

Titanisation of C/SiC composite fibres with core-shell structure was carried out by synthesis in molten salts. A mixture of salts KCl, LiCl and KTiF was used as the reaction medium, and metallic titanum powder was used as the titanising agent. The titanisation was carried out at a temperature of 800°C in a stationary argon atmosphere. Ceramic material was obtained from titanised fibres by hot pressing. The microstructure and phase composition of the fibres and hot pressed samples were investigated. It was found that TiSi and TiC phases are formed during titanation, and during hot pressing the TiSi phase reacts with the carbon core of C/SiC composite fibres to give titanium carbide TiC as a titanium-containing product. It was found that increasing the degree of titanisation leads to a decrease in porosity and an insignificant increase in strength of the obtained material.