摘要:
以5 μm金刚石微粉为原料，Ti和Al粉为结合剂，用六面顶压机在高温(1350 ~1550 ℃)高压(5.5 GPa)下制备PCD，研究了烧结温度对PCD的物相组成、微观结构和力学性能的影响。结果表明：在高温高压下，钛和铝分别与金刚石完全反应生成TiC和Al4C3，PCD主要由金刚石、TiC和Al4C3组成。随烧结温度的升高，PCD的性能先增加后降低。当烧结温度为1500 ℃时，金刚石被结合剂紧密包裹，颗粒之间无明显孔洞，PCD有最大的相对密度、维氏硬度、断裂韧性和磨耗比，分别为98.8 %、54.2 GPa、5.23 MPa?m1/2和6210。
Abstract:
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.
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