수산 탄탈륨 용액을 이용한 초미립 TaC-5Co 복합 분말의 합성

Abstract

Ultrafine TaC-5%Co composite powders were synthesized by spray conversion process using tantalum oxalate solution and cobalt nitrate hexahydrate(Co(NO3)2 · 6H2O). The phase of Ta-Co oxide powders had amorphous structures after calcination below 500℃ and changed Ta2O5, TaO2 and CoTa2O6 phase by heating above 600℃. The calcined Ta-Co oxide powders were spherical agglomerates consisted of ultrafine primary particles <50 nm in size. By carbothermal reaction, the TaC phase began to form from 900℃. The complete formation of TaC could be achieved at 1050℃ for 6 hours. The observed size of TaC-Co composite powders by TEM was smaller than 200 nm.