聚晶金刚石复合片界面微观结构对性能的影响

以硬质合金基体及优选的主晶为25?μm的金刚石颗粒为原料，在2种工艺下用国产铰链式六面顶压机高温高压制备聚晶金刚石复合片（PDC），研究PDC界面处微观结构对其性能的影响。结果表明:工艺1制备的PDC界面处存在类树枝状枝晶金属池，其是硬质合金中的金属元素向聚晶金刚石层方向迁移形成的，主要元素为C、W、Co；而工艺2制备的PDC中不存在此类现象。工艺1制备的PDC的耐热温度为870?℃，抗冲击等级为32，磨口面积为5.860?mm2；工艺2制备的PDC的耐热温度为920?℃，抗冲击等级为45，磨口面积为5.166?mm2。工艺2制备的PDC相对于工艺1制备的PDC，其耐热温度、抗冲击性能和耐磨性能分别提高50 ℃、40.6%和11.8%。 

Effect of interface microstructure on properties of polycrystalline diamond composites

The cemented carbide matrix and the preferred main crystal of 25 μm diamond particles as raw materials, the polycrystalline diamond composites (PDC) was prepared by domestic hinge-type cubic-anvil press at high temperature and high pressure (HPHT) under two processes. Effect of microstructure at PDC interface on its properties was studied. The results show that there is a dendrite-like growth metal pool at the interface of PDC prepared by process 1, which is formed by the migration of metal elements in cemented carbide to polycrystalline diamond layer, and the main elements are C, W and Co. This phenomenon does not exist in the interface of PDC prepared by process 2. The heat resistance temperature is 870 ℃, the impact resistance grade is 32 and the grinding area is 5.860 mm2 of PDC prepared by process 1. The heat resistance temperature is 920 ℃, the impact resistance grade is 45, and the grinding area is 5.166 mm2 of PDC prepared by process 2. Compared with the PDC prepared by process 1, the heat resistance, the impact resistance and the wear resistance of the PDC prepared by process 2 are increased by 50 ℃, 40.6% and 11.8%, respectively.