발간논문

Home > KJMM 논문 > 발간논문

Vol.29, No.10, 1024 ~ 1033, 1991
Title
Densification Behaviors of WC - Co Hard metals during Liquid Phase Sintering
박종구Jong Ku Park, 은광용Kwang Yong Eun, 윤덕용Duk Yong Yoon
Abstract
The liquid phase sintering behaviors of WC-Co compacts with milled and unmilled WC powders and large Co powder had been observed and compared to those observed previously in W-Ni and Fe-Cu alloys which show spherical grains. The compacts with milled WC powder show steady densification even during heating to the liquid phase sintering temperature. The compacts with unmilled WC powders show pronounced local densification during the liquid phase sintering, producing large pores. This observation is attributed to the rearrangement of the polyhedral grains under asymmetric capillary forces. In the compacts with large Co powder, large pores are initially produced when the Co particles melt and flow into the surrounding fine capillaries, but during the subsequent sintering treatment, the pores are filled by the Co-rich liquid as has been observed in W-Ni and Fe-Cu powder compacts. The mechanism of the pore filling process in WC-Co is expected to be quite complex because of the polyhedral grain shape.
Key Words
| PDF
대한금속∙재료학회 │ (06633) 서울시 서초구 서초대로 56길 38 대한금속∙재료학회 회관 (서초1동 1666-12번지)
Tel : 070-4266-1646 │ FAX : 02-557-1080 │ E-mail : metal@kim.or.kr
Copyright ⓒ 2013 사단법인 대한금속∙재료학회 All rights reserved.