摘要
An attempt was made to modify the surface of in-situ aluminium matrix composite （AMC） by micro-arc oxidation （MAO）. In the microstructure of AMC, CuAl2 reinforcements were generated by introducing 15% CuO into the aluminium melt. AMC was hot forged, homogenised, quenched and artificially aged before the MAO in a KOH, KF and Na2SiO3-containing electrolyte. After the MAO process the surface of the AMC was covered with Al2O3 coating having an effective thickness of about 15μm. Appearance of crack and/or delamination free zones at the periphery of the indent after the Rockwell C adhesion test indicated good adhesion between the composite and the Al2O3 coating. During dry sliding wear tests, this adherent Al2O3coating resisted the destructive action of the Al2O3 ball and provided about 15 times enhancement in wear resistance as compared to the original state.
采用微弧氧化工艺来改善原位颗粒增强铝基复合材料的表面性能。通过向铝熔体中加入15%CuO来制备CuAl2增强铝基复合材料。所制备的材料经过热压、均匀化处理、淬火和人工时效处理,然后在含KOH、KF和Na2SiO3的电解液中进行微弧氧化处理。经微弧氧化处理,复合材料的表面生成了有效厚度约15μm的Al2O3膜层。洛氏硬度测试后,在压痕边缘部位没有出现裂纹或明显的剥离现象,表明Al2O3膜层与基底结合良好。干摩擦试验结果表明,Al2O3膜层对Al2O3球的破坏性作用具有明显的抑制,Al2O3膜层的磨损性能比基体提高15倍以上。
