汽车发动机活塞顶部需要隔热、耐热、抗热冲击。利用陶瓷层的隔热、降低应力集中作用 ,在活塞顶部喷涂一层牢固的隔热陶瓷是常见的选择。但喷涂的陶瓷层由于与铝基体之间存在一层明显的分界面 ,热膨胀系数差别较大 ,不耐热冲击 ,在热循环中易脱落。而微弧氧化技术正好能克服这 Automotive engine piston top insulation, heat resistance, thermal shock. The use of ceramic insulation layer, reducing stress concentration, the top of the piston sprayed with a layer of strong insulation ceramic is a common choice. However, the sprayed ceramic layer due to the existence of a clear interface with the aluminum substrate, the larger the thermal expansion coefficient, thermal shock resistance, easy to fall off in the thermal cycle. The micro-arc oxidation technology just to overcome this