금속염용액의 분무열분해에 의한 TiC/Co 복합분말 제조

Abstract

In the present study, the focus is on the synthesis of titanium carbide/cobalt composite powder by the spray thermal conversion process using metallic salt solution as the raw materials. Two types of oxide powders of Ti-Co-O system were prepared by the spray drying of two types of metallic salt solutions : titanium chloride-cobalt nitrate and TiO2 powder-cobalt nitrate solutions. These oxide powders were mixed with carbon black, and then these mixtures were carbothermal reduced under a flowing argon atmosphere. The changes in the phase structure and thermal gravity of the mixtures during carbothermal reduction were analysed using XRD and TG-DTA. In the case of using the titanium chloride-cobalt nitrate solution, it could not be obtained TiC/Co composite powder due to contamination of the impurities during the spray drying of the solution. However, in the case of using the TiO2 powder-cobalt nitrate soultion, TiC-15 wt.%Co composite powder could be synthesized by the spray thermal conversion process. The synthesized TiC-15 wt.%Co composite powder at 1200℃ for 2 hours has an average particle size of 150 nm.