【作者】 吴宏伟；

【导师】 袭建军；

【作者基本信息】 哈尔滨工业大学 ， 机械制造及其自动化（专业学位）， 2015， 硕士

【摘要】 随着现代工业及科学技术的发展,铝合金材料用量越来越多,但其耐磨、耐冲刷烧蚀、耐蚀性能较差,大大限制了其应用领域,亟待一种表面处理技术来解决。微弧氧化作为一种新兴的表面处理技术解决了上述应用难题,并在生产实践中取得了很好的效果。目前关于铝合金的微弧氧化研究一般多见于硬铝系列合金,而铸造铝合金由于含硅量较高,且硅元素有碍于微弧氧化,因此关于铸造铝合金的微弧氧化研究相对较少。为此,本文采用双极性非对称脉冲电源,对铸造铝合金微弧氧化过程中主要影响因素及膜层性能进行了较为系统地研究,将膜层厚度、硬质层的硬度,硬质层的比例作为主要指标,来研究氧化时间、电源参数、电解液浓度等对膜层的影响,通过实验了解铸造铝合金微弧氧化的基本规律。首先,对微弧氧化技术进行了简介,并对微弧氧化技术在国内外发展及应用情况进行了综述。接着,对微弧氧化膜层的生长机制进行了研究分析,分析了产生微弧氧化电击穿的原因。然后,利用涡流测厚仪、X射线衍射仪、扫描电镜等检测仪器,以ZL101为材料,在弱碱性电解液中进行大量微弧氧化试验。对不同氧化时间、电解液参数、电参数等参数下制备的氧化膜的厚度、硬质层的硬度、硬质层的比例进行了研究,得出了参数对氧化膜的影响规律;最后,进行了陶瓷膜摩擦磨损量和摩擦系数与摩擦时间的实验;微弧氧化、镀硬铬和热喷涂三种金属改性处理试样的磨损特性之对比实验;摩擦系数随载荷的变化情况的实验,探讨了某些工艺参数与摩擦磨损特性的关系。结果表明,微弧氧化膜层制备工艺参数的变化直接影响氧化膜的性能,通过对工艺参数的控制和优化,可以实现对微弧氧化膜层生长过程的预测、控制与优化,从而制备与基体结合强度高、耐磨性能优异的微弧氧化膜层。更多还原

【Abstract】 With the development of modern industry and technology, Aluminum alloy is widely used more and more,but they have poor wear-resistance,erosion-resistance and corrosion resistance,which greatly limit them apply fields.This problem need a kind of surface treatment technology to solve. Microarc oxidation technology is developed based on the technology of anodic oxidation,which is a new technique of ceramic oxidation film growth on the surface of Al, Mg, Ti and their alloys.Now the research on microarc oxidation of aluminum alloy is mostly focused on duralium alloy series, and that on cast aluminum alloy with high silicon content, which inhibition of microarc oxidation, is relatively less.Therefore, this paper systematically studied main influencing factors and properties of the oxidation film in the cast aluminum alloy microarc oxidation process,uesd asymmetric bipolar alternating pulse power supply, and study the effect of oxidation time, electrolyte concentration, power parameters, with the hardness,thickness, dense layer, dense layer ratio of the film as the main index, understand the basic rules of the cast aluminium microarc oxidation. Firstly,the microarc oxidation technology were introduced, and the development of the microarc oxidation technology at home and abroad are reviewed.Secondly, the growth mechanism of microarc oxidation films were analyzed, elaborated the classification of plasma, and theory was propoed that microarc oxidation process is firstly oxygen bubble hole bottom field of ceramic membrane breakdowntriggered the avalanche breakdown.Thirdly,with the ZL101 as material,a serial tests were taken in alkaline electrolyte. Which were studied the thickness of film, the hardness and ratio of dense layer in the different oxidation time, electrolyte parameters and electrical parameters, with detection instruction such as etm, xrd,sem etc., and achived the effects of process parameters and electrical parameters on oxidation film.Lastly, friction experiments were set up to study the wear extent and friction factor in different friction time.The comparative friction experiments with microarc oxidation, hard chromium plating and thermal spraying three kinds of metal modified techonology,and the friction experiments of the friction coefficient changes with the load were taken,to study the relationship between some process parameter and friction wear characteristics.The results show that, microarc oxidation film preparation parameters directly affect the properties of oxidation film, the control and optimization of process parameters, can predict, control and optimization of growth process of microarc oxidation film, and preparation of microarc oxidation film with good wear properties.更多还原