金刚石表面镀Ti对Cu40Ni30Fe20Sn5Ti5/金刚石复合材料界面反应行为的影响

Effects of Ti coating on diamond surface on interfacial reaction behavior of Cu40Ni30Fe20Sn5Ti5/diamond composites

以Cu40Ni30Fe20Sn5Ti5多主元合金粉末和表面镀覆Ti层的金刚石颗粒为原料,采用放电等离子烧结方法制备复合材料,研究Ti镀层对黏结相和金刚石的界面反应情况以及复合材料力学性能和磨损性能的影响。研究结果表明:金刚石表面镀覆Ti层后,界面处反应生成的TiC层更加连续致密,提高了金刚石磨粒与黏结相的界面结合强度,使得复合材料具有更高的横向断裂强度。金刚石表面镀覆的Ti层降低了烧结过程中金刚石的石墨化程度,保证摩擦过程中金刚石晶体的完整性和出露高度,提高了复合材料的磨损效率和磨耗比,同时降低了复合材料的体积磨损率。因此,金刚石表面镀覆Ti层可有效地提升多主元合金/金刚石复合材料的服役性能。

Using Cu40Ni30Fe20Sn5Ti5 multi-principal components alloy powder and Ti-coated diamond particles as raw materials,Cu40Ni30Fe20Sn5Ti5/diamond composites were prepared by spark plasma sintering(SPS).The optimizations of Ti coating on the interfacial reaction between the binder phase and diamond,as well as the effects on the mechanical properties and wear properties of the composites were studied.The results show that a layered structure of TiC formed by the reaction at the interface is more continuous and dense after the Ti layer is coated on the diamond particle surface,which improves the interfacial bonding strength between the binder phase and diamond,and makes the composites have higher transverse rupture strength(TRS).The Ti coating on diamond surface reduces the graphitization degree of diamond during the sintering process,ensures the integrity and protrusion height of diamond in the friction process,thus improving the wear efficiency and abrasion ratio of the composites.Furthermore,the volume wear rate of the composites is reduced and the service life of the diamond tools is prolonged after the diamond particle is coated.Therefore,Ti coating on diamond particle surface is an effective way to improve the service performance of multi-principal components alloy/diamond composites.