Fabrication and Tribological Properties of Diamond-Like Carbon Film on Copper Alloy Gasket
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摘要: 采用物理气相沉积工艺在黄铜H62垫片上制备了DLC薄膜，对DLC薄膜进行了拉曼光谱分析和截面形貌观察，测试了薄膜厚度、纳米硬度和结合力，进行了磨擦磨损试验，分析了薄膜的减摩耐磨性能。结果表明，在H62铜合金垫片制备碳膜为DLC薄膜，薄膜总厚约2.31μm，底层厚约0.49μm。薄膜纳米硬度22.1 GPa，薄膜与基体结合良好，结合性能HF1级，结合力41.1 N。H62铜合金垫片制备DLC薄膜后，摩擦系数由0.55降至0.25，磨损率由1.3×10-4 mm3/Nm降至1.1×10-5 mm3/Nm，具有优异的减磨性能和耐磨损性能。装拆10次后，垫片表面DLC薄膜完整，基本无损伤，满足使用要求。Abstract: DLC film was fabricated on the H62 brass gasket by physical vapor deposition. Raman spectroscopy and cross-sectional morphology observation were performed on the film, and the thickness, nanohardness and adhesion strength were tested. Finally, friction-reduction and wear-resistant properties of the DLC film were analyzed after tribological test.Resultsshowed that the thickness of the DLC film on H62 brass gasket was totally 2.31 μm, the thickness of interlayer was approximately 0.49 μm. The hardness of DLC film was 22.1 GPa, and the adhesion between DLC film and the substrate was strong(HF1 for indentation and 41.1 N for scratching). When the H62 brass gasket was coated by DLC film, the friction coefficient decreased from 0.55 to 0.25, the wear rate decreased from 1.3×10-4 mm3/Nm to 1.1×10-5 mm3/Nm, meaning good friction-reduction and wear-resistant properties were achieved. After 10 times assembling and disassembling, the DLC film on gasket was complete, and no significant damage could be detected, therefore, the gasket with film could meet the requirement.
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