金属复合材料微弧氧化研究进展

发布时间：2018-11-05 07:16

【摘要】：微弧氧化是一种在阀金属(Al、Mg、Ti等)及其合金表面原位生成陶瓷膜的表面处理技术。利用微弧氧化技术获得的膜层与基体结合力强,能改善材料的耐磨、耐蚀、耐热冲击以及绝缘性等性能。以微弧氧化的发展和成膜机理作为切入点,比较了单一合金与金属复合材料微弧氧化处理的异同,发现机理的研究主要围绕电击穿理论展开,具有阀金属特性的第二相有助于复合材料微弧氧化的进行,而其他的第二相则会阻碍微弧氧化成膜,使机理研究变得复杂。综述了电解液及添加剂、电压、电流密度、频率和占空比、温度和处理时间等对金属复合材料微弧氧化过程,及膜层微观结构、相组成、厚度、硬度以及耐磨、耐蚀性能的影响。最后指出了复合材料微弧氧化目前存在的问题,提出了需要从加强机理研究、优化工艺的参数、改进微弧氧化设备以及与其他技术相结合等研究方向着手,以进一步加快金属基复合材料微弧氧化处理及改善陶瓷膜的性能,推进微弧氧化技术的应用。
[Abstract]:Micro-arc oxidation is a surface treatment technique for in-situ formation of ceramic film on the surface of valve metal (Al,Mg,Ti et al.) and its alloys. The coatings obtained by micro-arc oxidation have strong adhesion to the substrate, which can improve the wear resistance, corrosion resistance, heat shock resistance and insulation properties of the materials. Based on the development of micro-arc oxidation and film forming mechanism, the similarities and differences between single alloy and metal composite are compared. The research of mechanism is mainly focused on the theory of electric breakdown. The second phase with the metal characteristics of the valve is helpful to the microarc oxidation of composite materials, while the other second phase will hinder the formation of film by micro-arc oxidation, which makes the study of mechanism more complicated. The effects of electrolyte and additives, voltage, current density, frequency and duty cycle, temperature and treatment time on the process of microarc oxidation of metal composites are reviewed. The microstructure, phase composition, thickness, hardness and wear resistance of the coatings are also reviewed. The effect of corrosion resistance. Finally, the existing problems of microarc oxidation of composite materials are pointed out, and the research directions of strengthening mechanism, optimizing process parameters, improving micro-arc oxidation equipment and combining with other technologies are put forward. In order to further accelerate the treatment of metal matrix composites by micro-arc oxidation and improve the performance of ceramic film, the application of micro-arc oxidation technology is promoted.
【作者单位】：广西大学材料科学与工程学院;广西玉林北流市环境监测站;
【基金】：广西自然科学基金(2014GXNSFCA118013、0731013) 广西高等学校高水平创新团队项目(第二批) 广西自然科学基金创新研究团队项目(2011GXNSFF018001)~~
【分类号】：TG174.453

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