Preparation of Ni60B Ni Based Self-fluxing Alloy by Spark Plasma Sintering

KF-Ni60B Ni based then self-fluxing alloy (SFA) was prepared by spark plasma sintering (SPS) process. The effects of sintering temperature, holding time and sintering pressure on properties of the sintering body were studied by the measurements of hardness and density and then the sintering process was optimized. The results indicate that the greatest influence factor on properties was sintering temperature, and followed by sintering pressure and time. Under pressure of 65 MPa, the Ni60B SFA sintered at 870 ℃ for 15 min had the best properties with hardness of 64.22 HRC and density of 7.713 g·cm-3. Microstructure of the sintered alloy was γ-Ni solid-solution matrix with fine grain size, which was uniform distributed with hard phases of carbides with Cr, Fe and boride.