铝基体上等离子体电解氧化陶瓷涂层的冲蚀性能

Erosion performance of plasma electrolytic oxidation ceramic coating on aluminum substrate

采用气流喷砂式冲蚀试验机,对铝合金基体的等离子体电解氧化(PEO)陶瓷层进行冲蚀性能研究。利用扫描电子显微镜及精密天平,检测了PEO陶瓷层的表面冲蚀形貌及冲蚀磨损量,比较分析了粒子速度、入射角度对冲蚀磨损率及冲蚀形貌的影响规律。结果表明,PEO陶瓷涂层在受冲蚀时表面裂纹萌生扩展导致材料破碎成细块脱落,属于典型的脆性材料冲蚀行为;PEO陶瓷涂层冲蚀磨损率随入射角度的减小逐渐降低,对低角冲蚀表现良好的抗冲蚀能力;粒子速度对PEO陶瓷层冲蚀磨损率的影响非常明显,其速度指数为2.7。

Using air-blast erosion test machine,the erosion performance of plasma electrolytic oxidation（ PEO） ceramic coatings on aluminum alloy substract was studied. Surface morphology and erosion mass loss of PEO ceramic coatings were tested by scanning electron microscopy and precision scales,and the effects of particle velocity and incident angle on erosion rate and erosion morphology were analyzed.The results show that cracks initiation and propagation on the surface of PEO ceramic coatings after erosion which makes the material break into thin pieces and fall off. Therefore,the erosion of PEO ceramic coatings is a typical brittle material erosion behavior. But the erosion rate of PEO ceramic coatings gradually reduces with the reduction of incident angle,and the PEO ceramic coatings show good erosion resistance when the incident angle is low. Meanwhile,the particle velocity on the erosion rate of PEO ceramic coating has an obvious effect,and the speed index is 2. 7.