Co 질산염과 TiO(OH)₂ 슬러리를 이용한 초미립 TiC-5%Co 제조 및 WC-Co 분말과의 혼합에 따른 소결체 특성
Synthesis of Ultrafine TiC-5%Co Powder by Using Co Nitrate and TiO(OH)₂ Slurry and Evaluation of Sintered Materials Prepared by Mixing WC-Co.
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Ultrafine TiC-5%Co powders were synthesized by spray drying of aqueous solution of Ti(OH)₂slurry and cobalt nitrate, followed by calcination and carbothermal reaction. The oxide powders with carbon powder was reduced and carburized at 900℃~1250℃ under hydrogen atmosphere. During reduction, CO gas wasmainly evolved by reducing reaction of oxides. Ultrafine TiC-5%Co powders were easily formed by carbothermalreaction at 1250℃ due to using ultrafine powders as raw materials. The ultrafine WC-TiC-Co alloy prepared bysintering of mixed powder of ultrafine WC-13%Co powder and ultrafine TiC-5%Co powder has higher sintereddensity and mechanical properties than WC-TiC-Co alloy prepared by commercial WC, TiC and Co powders.
Abstract
Ultrafine TiC-5%Co powders were synthesized by spray drying of aqueous solution of Ti(OH)₂slurry and cobalt nitrate, followed by calcination and carbothermal reaction. The oxide powders with carbon powder was reduced and carburized at 900℃~1250℃ under hydrogen atmosphere. During reduction, CO gas wasmainly evolved by reducing reaction of oxides. Ultrafine TiC-5%Co powders were easily formed by carbothermalreaction at 1250℃ due to using ultrafine powders as raw materials. The ultrafine WC-TiC-Co alloy prepared bysintering of mixed powder of ultrafine WC-13%Co powder and ultrafine TiC-5%Co powder has higher sintereddensity and mechanical properties than WC-TiC-Co alloy prepared by commercial WC, TiC and Co powders.
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