本文采用超快速高温烧结技术制备以CuCoCrNi多主元合金为黏结相的金刚石复合材料,借助X射线衍射仪、扫描电镜、拉曼衍射仪、摩擦磨损实验等手段,研究烧结参数对复合材料金刚石石墨化程度及致密化行为的影响。结果表明：采用合适的工艺参数,超快速高温烧结技术可以在短时间内获得金刚石石墨化程度低(IG/ID=0.201 4)、摩擦因数低(μ=0.06)且相对密度达到91.22%的CuCoCrNi/金刚石复合材料。高电流密度产生的焦耳热以及局部热效应能显著提高烧结驱动力,促进基体中的Cr与金刚石表面结合形成界面层,有利于复合材料致密化。但过高能量输入会引发金刚石颗粒团聚及严重的金刚石石墨化(IG/ID>1.0),降低Cr元素与金刚石颗粒表面的亲和度和界面结合强度,从而降低复合材料的致密度及摩擦性能(μ>0.1)。
In this study, ultrafast high-temperature sintering was employed to fabricate diamond composites using CuCoCrNi multi-principal element alloy as the bonding phase. The effects of sintering parameters on the degree of diamond graphitization and densification behavior were investigated with X-ray diffractometer, scanning electron microscope, Raman spectroscope, and friction experiments. The results demonstrate that ultrafast high-temperature sintering can produce CuCoCrNi/diamond composites with low graphitization (IG/ID=0.201 4), low friction factor (μ=0.06), and relative density of 91.22% in a short time by adopting suitable process parameters. Joule heating generated by high current density and localized thermal focusing significantly enhance the sintering driving force, promoting the bonding of Cr in the matrix with the diamond surface to form an interface layer is conducive to the densification of the composites. However, too high energy input can cause diamond particle agglomeration and severe diamond graphitization (IG/ID>1.0), reduce the affinity and the interfacial bonding strength between Cr element and diamond particle surface, leading to the decrease of density and friction properties (μ>0.1) of diamond composites.
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