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SiCp/Al复合材料具有质量轻、导热性能好、高强度、高比模量、热膨胀系数低、耐磨损等优点,在空间轻型反射镜领域有良好的应用前景。在SiCp/Al复合材料表面化学镀镍可以改善其抛光性能。本研究采用实验和分子模拟方法探讨了镀层与SiCp/Al复合材料表面的结合机制。采用扫描电子显微镜观察镀层的表观形貌,结果表明,镀层均匀致密;采用划痕实验测试镀层的结合强度,其临界载荷Lc大于100N。同时,采用分子动力学模拟的方法从理论上分析镀层与基体的结合状态,并计算出二者的结合能为108.4kJ·mol-1。
SiCp / Al composite has the advantages of light weight, good thermal conductivity, high strength, high specific modulus, low coefficient of thermal expansion and wear resistance. It has good application prospect in the field of space light reflecting mirror. Electroless nickel plating on SiCp / Al composites can improve its polishing performance. In this study, the experimental and molecular simulation methods were used to investigate the bonding mechanism between the coating and SiCp / Al composites. The morphology of the coating was observed by scanning electron microscopy. The results showed that the coating was uniform and compact. The scratch resistance test was used to test the bonding strength of the coating. The critical load Lc was greater than 100N. At the same time, the molecular dynamics simulation method is used to theoretically analyze the bonding state between the coating and the substrate, and the binding energy of the two is calculated to be 108.4 kJ · mol-1.