The effect of sintering temperature on the properties of PCD with Ti-Al binder

PCD was prepared using 5 mm diamond micro-powder as raw material, Ti and Al powder as binder under high temperature (1350~1550 ℃) and high pressure (5.5 GPa) using a by a multi-anvil device. The effect of sintering temperature on the phase composition, microstructure, and mechanical properties of PCD was studied. The results show that under high temperature and high pressure, Ti and Al react completely with diamond to form TiC and Al4C3, respectively, consequently, PCD is mainly composed of diamond, TiC, and Al4C3. As the sintering temperature increases, the performance of PCD first increases and then decreases. When the sintering temperature is 1500 ℃, diamond is tightly wrapped by the binder without obvious pores between particles, therefore, PCD has the highest relative density, Vickers hardness, fracture toughness, and wear ratio, which are 98.8%, 54.2 GPa, 5.23 MPa?m1/2, and 6210, respectively.