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새로운 용액환원법에 의한 구형 코발트 미세 분말의 제조
김대원,김지훈,최요한,최희락,윤진호,Kim, Dae Weon,Kim, Ji-Hoon,Choi, Yo-Han,Choi, Hee Lack,Yoon, Jin-Ho 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.4
Spherical fine cobalt powders were fabricated by new liquid reduction method. Commercial cobalt sufate heptahydrate was used as raw material. Also ethylene glycol was used as solvent and hydrazine-sodium hypophosphite mixture was used as reduction agent for the new liquid reduction method. A plate shaped cobalt powders with an approximately 300 nm were prepared by a traditional wet ruduction method using distilled water as solvent and hydrazine. Spherical fine cobalt powders with an average size of $1-3{\mu}m$ were synthesized by a new liquid reduction method in 0.3M cobalt sulfate and 1.5M hydrazine-0.6M sodium hypophosphite mixture at 333K.