SiC_p/Al复合材料反射镜坯表面镀镍层的结合分析(英文)

Adhesion Analysis of Electroless Ni Coating on SiC_p/Al Composite Mirror Substrate

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, which has light mass, high thermal conductivity and strength, enhanced specific modulus, compatible coefficient of thermal expansion （CTE）, sufficiently high wear resistance, is considered as a promising material for the space lightweight mirror. In order to improve the polishing properties of the material, electroiess Ni plating on SiCp/Al composite for the space lightweight mirror was carried out. The adhesion of the coating and substrate was also studied by experiments and molecular simulations. The morphologies of the coated layers were inspected by means of scanning electron microscope （SEM）. The experimental results demonstrate that the coating is uniform and compact. The assessments of coatings adhesion were made using scratch test, and the critical load Lc is more than 100 N. Molecular dynamics （MD） was used to simulate the interactions of the coating, and composite, and the calculated interaction energy is 108.4 kJ·mol^-1.