Ag/WC 소결 전기 접점 소재의 미세조직, 기계적 및 전기적 특성에 미치는 WC 입자 크기의 영향

김수빈; 박소연; 임종빈; 권순호; 이기안

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자료유형: 학술저널

저자정보: 김수빈 (인하대학교 신소재공학과) 박소연 (인하대학교) 임종빈 (LT메탈) 권순호 (LT메탈) 이기안 (인하대학교)

저널정보: 한국분말야금학회 한국분말야금학회지 한국분말재료학회지 제30권 제3호

발행연도: 2023.6

수록면: 242 - 248 (7page)

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The Ag/WC electrical contacts were prepared via powder metallurgy using 60 wt% Ag, 40 wt% WC, and small amounts of Co3O4 with varying WC particle sizes. After the fabrication of the contact materials, microstructure observations confirmed that WC-1 had an average grain size (AGS) of 0.27 μm, and WC-2 had an AGS of 0.35 μm. The Ag matrix in WC-1 formed fine grains, whereas a significantly larger and continuous growth of the Ag matrix was observed in WC-2. This indicates the different flow behaviors of liquid Ag during the sintering process owing to the different WC sizes. The electrical conductivities of WC-1 and WC-2 were 47.8% and 60.4%, respectively, and had a significant influence on the Ag matrix. In particular, WC-2 exhibited extremely high electrical conductivity owing to its large and continuous Ag-grain matrix. The yield strengths of WC-1 and WC-2 after compression tests were 349.9 MPa and 280.7 MPa, respectively. The high yield strength of WC-1 can be attributed to the Hall–Petch effect, whereas the low yield strength of WC-2 can be explained by the high fraction of high-angle boundaries (HAB) between the WC grains. Furthermore, the relationships between the microstructure, electrical/mechanical properties, and deformation mechanisms were evaluated.

#Ag/WC #Electrical contact material #Microstructure #Mechanical Property #Electrical property

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