界面反应对Cu35Ni25Co25Cr15多主元合金/金刚石复合材料磨损性能的影响

金刚石超硬磨具在高端芯片加工、3C陶瓷等领域发挥的作用日益重要，粘结相与金刚石的界面结合情况在很大程度上影响了金刚石超硬复合材料的力学和磨损性能。为了研究粘结相和金刚石的界面结合情况，采用放电等离子烧结方法制备了Cu₃₅Ni₂₅Co₂₅Cr₁₅多主元合金/金刚石复合材料，通过热力学计算和实验研究了粘结相和金刚石颗粒的界面反应。结果表明：烧结过程中，金属粘结相中的Cr元素与金刚石在界面处发生了化学反应，生成Cr-C化合物，且Cr-C化合物层的厚度随着烧结温度的升高而增加。当烧结温度达到950℃时，Cr-C化合物反应层均匀连续，厚度大约为1.1μm。复合材料粘结相与金刚石颗粒的粘结系数随着Cr-C化合物层厚度的增加而增大。摩擦磨损测试表明，在900℃和950℃烧结的样品表面，粘结相在摩擦过程中首先被磨除，金刚石随后露出，而Cr-C界面反应层有助于保持对金刚石颗粒的把持能力，提高复合材料的磨削性能。因此，适当的界面反应可提升金刚石复合材料的服役性能。

Effect of interfacial reaction on wear properties of Cu35Ni25Co25Cr15 multi-principal components alloy/diamond composites

Diamond superhard abrasive tools play an increasingly important role in high-end chips, 3C ceramics processing and other fields. The interface between binder phase and diamond greatly affects the mechanical and wear properties of diamond superhard composites. In order to study the interfacial bonding between binder phase and diamond, Cu₃₅Ni₂₅Co₂₅Cr₁₅ multi-principal components alloy/diamond composite was prepared by spark plasma sintering (SPS). The interfacial reaction between alloy binder phase and diamond particles was studied by thermodynamic calculation and experiments. The results show that chromium reacts with diamond at the interface to form Chromium carbides. Moreover, with the sintering temperature increasing, the thickness of Chromium carbides layer grows and the cohesion coefficient between the alloy binder phase and diamond increases. When sintering temperature reaches 950℃, the Chromium carbides layer is uniform and continuous, and the thickness is about 1.1 μm. The friction and wear tests show that on the surface of the composite sintered at 900℃ and 950℃, the alloy binder phase is removed firstly by the shear stress, and then the diamond particles expose. Due to the retention of the Chromium carbides layer, the grinding performance of the composites is improved effectively. Therefore, appropriate interfacial reaction improves the service properties of the diamond composites.