研究了控制氢气流量为5 L/min,热处理温度为400、600和800℃,热处理时间为30 min条件下的氢气热处理对CuCr0.8/金刚石复合材料组织和性能的影响。断口SEM观察表明,氢气热处理后基体铜合金塑性变差且从金刚石表面脱粘,复合材料断裂方式为沿晶断裂,随热处理温度的上升组织劣化程度增加。复合材料残余抗弯强度随温度上升单调下降,最小值仅相当于未处理的28.0%,而热膨胀系数（CTE）最大值可达9.82×10-6/℃。经外观颜色与断口SEM观察并结合XRD分析可以推断氢蚀机制为：高温下氢夺取了复合材料中的氧生成了高压水蒸汽,不仅使基体脆化与界面胀裂,而且加速了界面碳化铬层的氧化及金刚石表层的石墨化。
Effect of hydrogen heat treatment on microstructure and properties of CuCr0.8/diamond composites was investigated.The hydrogen flow rate was controlled at 5 L/min and heat treating temperature was set at 400,600 and 800 ℃ for 30 min.SEM observation on fracture surface shows that after hydrogen heat treatment,copper alloy matrix lost partial ductility and separated from diamond surface.The failure mode of composites is intergranular fracture.The microstructure was deteriorated more obviously with increasing heat treatment temperature.With increasing temperature the residual bending strength of composites was decreased,the minimum value was only 28.0% of that of untreated one.The maximum value of coefficient of thermal expansion（CTE） can reach 9.82×10-6/℃.Through the fracture surface observation and XRD analysis,the hydrogen corrosion mechanism is deduced as follows： hydrogen seizes the oxygen from the composite interface and forms high-pressure water vapor at high temperature,which not only embrittles the matrix and results in the interfacial debonding,but also accelerates both the oxidation of chromium carbide at interface and the graphitization of surface layer of diamond.
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