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Binder-free Tungsten Carbide Fabricated by Pulsed Electric Current Sintering
Shimojima K.,Hosokawa H.,Nakajima T.,Mizukami M.,Yamamoto Y. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In this paper, we show some experimental results of binder-free WC sintered by Pulsed Electric Current Sintering (PECS) also known as Field Assisted Sintering Technology (FAST). These binder-free WC have extremely hardness and stiffness. However, these mechanical properties are dependent on the sintering condition, e.g., maximum temperature, applied pressure, etc. We show some relationship between mechanical properties and sintering condition to improve to sinter the binder-free WC.
Friction and Wear Behaviors of WC-Co/WC-Co Pairs in Air
Hosokawa H.,Nakajima T.,Shimojima K. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
To investigate sliding friction and wear behaviors of WC-Co/WC-Co pairs containing different WC grain sizes, the ball-on-disc test in air were carried out, where WC grain sizes a (F.G.) and (C.G.). The wear volume of F.G. pin for F.G. pin/C.G. disc is larger than that of F.G. pin for F.G. pin/F.G. disc due to higher friction coefficient, and the surfaces after wear test are richer in oxygen compared to those before test. Furthermore, the wear debris, which is composed of nona-scale grain, after the wear test are remarkably richer in oxygen than to those before test.