Fe 함량변화에 따른 텅스텐카바이드 초경소재의 특성평가

• Published in: 대한금속·재료학회지, 58(8) Vol. 58; no. 8; pp. 533 - 539
• Main Authors: 김주훈, Ju-hun Kim, 이정한, Jeong-han Lee, 장준호, Junho-jang, 오익현, Ik-hyun Oh, 홍성길, Sung-kil Hong, 박현국, Hyun Kuk Park
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 05.08.2020; 대한금속·재료학회
• Subjects: grain size; mechanical properties; microstructure; spark plasma sintering method; WC-Fe; 재료공학
• ISSN: 1738-8228; 2288-8241

In this study, consolidated WC-Fe compacts as a function of Fe contents were fabricated by a spark plasma sintering method, following the mixed by the ball-milled powder. Fe among the metallic binders was added to WC enhance not only the driving force of sintering process but also suppressing the grain growth. WC-Fe mixed powder samples were fabricated with 5, 10 and 15 wt.% Fe contents, and the particle sizes of the mixed powders were determined to be 2.15 to 3.15 μm, respectively. The WC-Fe mixed powders were processed by spark plasma sintering, at a sintering temperature of 1300 oC. Consequently, the relative densities of the WC-5, 10 and 15 wt.% Fe sintered-bodies were about 99.2, 99.5 and 100%, respectively. The grain sizes of the WC-5, 10 and 15 wt.% Fe sintered-bodies were about 0.92, 0.98 and 1.02 μm, respectively. The Fe particles penetrated into the WC particles by dissolving and re-precipitation, and the final sintered bodies were completely densified. The mechanical properties of the WC-Fe sintered-bodies exhibited a hardness up to 1934 kg·mm 2 and a fracture toughness above 6.88 MPa·m 1/2 . The microstructure behavior of the WC-Fe sintered-bodies was investigated in terms of mechanical properties to examine their properties for various Fe contents. In addition, the mechanical and physical properties were compared with the reported values for other sintering-processes, i.e. HFIHS, HIP, etc. (Received January 20, 2020; Accepted June 24, 2020)