초고에너지 볼 밀링공정에 의한 (Hf-Ti-Ta-Zr-Nb)C 고엔트로피 카바이드 분말 제조 및 미세화 거동

송준우; 한준희; 김송이; 석진우; 김효섭

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자료유형: 학술저널

저자정보: 송준우 (한국생산기술연구원) 한준희 (한국생산기술연구원) 김송이 (한국생산기술연구원) 석진우 (한국생산기술연구원(인천)) 김효섭 (한국생산기술연구원)

저널정보: 한국분말야금학회 한국분말야금학회지 한국분말재료학회지 제29권 제1호

발행연도: 2022.2

수록면: 34 - 40 (7page)

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Recently, high-entropy carbides have attracted considerable attention owing to their excellent physical and chemical properties such as high hardness, fracture toughness, and conductivity. However, as an emerging class of novel materials, the synthesis methods, performance, and applications of high-entropy carbides have ample scope for further development. In this study, equiatomic (Hf-Ti-Ta-Zr-Nb)C high-entropy carbide powders have been prepared by an ultrahigh- energy ball-milling (UHEBM) process with different milling times (1, 5, 15, 30, and 60 min). Further, their refinement behavior and high-entropy synthesis potential have been investigated. With an increase in the milling time, the particle size rapidly reduces (under sub-micrometer size) and homogeneous mixing of the prepared powder is observed. The distortions in the crystal lattice, which occur as a result of the refinement process and the multicomponent effect, are found to improve the sintering, thereby notably enhancing the formation of a single-phase solid solution (high-entropy). Herein, we present a procedure for the bulk synthesis of highly pure, dense, and uniform FCC single-phase (Fm3m crystal structure) (Hf-Ti-Ta-Zr-Nb)C high-entropy carbide using a milling time of 60 min and a sintering temperature of 1,600oC.

#High-Entropy Carbide #Ultra High Energy Ball Milling #Refinement Behavior #Microstructure #Single Phase

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