微弧氧化对活塞顶部耐热性能的影响

Effects of Micro Arc Oxidation on Heat Resistance of the Piston Top

在工业生产条件下,采用微弧氧化技术对活塞顶部进行表面强化,分析微弧氧化对活塞顶部耐热性能的影响。结果表明,微弧氧化膜层表面区域有较多的凹坑,膜层中存在Al和Si复合氧化物;微弧氧化层有着良好的隔热效果,有效隔热温度为20~30℃;未微弧氧化活塞极限耐热温度为490~500℃,微弧氧化后活塞极限耐热温度为520~530℃,耐热能力提高了30℃左右。

Under the condition of industrial production,the surface of the piston top was strengthened by micro arc oxidation technology,and the influence of micro arc oxidation on the heat resistance of the piston top was analyzed.The results reveal that there are many pits on the surface of the micro arc oxidation film,and there are Al and Si composite oxides in the film.The micro arc oxidation layer has good heat insulation effect,and the effective heat insulation temperature is 20~30℃.The ultimate heat-resistant temperature of the piston without micro arc oxidation is 490~500℃,and the ultimate heat-resistant temperature of the piston after micro arc oxidation is 520~530℃.The heat-resistant capacity is increased by about 30℃.