LY12铝合金微弧氧化工艺与摩擦性能的研究
发布时间：2018-11-09 18:24
【摘要】：铝合金以其优良的物理、化学及加工性能被广泛应用于航空、航天、交通运输等领域。但其存在耐磨性能差的缺点,大大限制了其应用。因此对铝合金进行表面处理来改善其表面性能是十分必要的。微弧氧化术作为一种新兴的、绿色的表面处理技术能够在铝合金表面形成硬度高、耐磨耐蚀性好的氧化物膜层而被广泛采用。本文以LY12铝合金为研究对象,采用低电压微弧氧化技术,通过向电解液中加入固体润滑颗粒BN,制备出致密性良好的自润滑复合膜层,解决了传统微弧氧化存在的"膜层表面摩擦性能差"的问题。采用SEM、XRD等分析手段观察膜层表面形貌,研究其物相组成;对膜层表面进行摩擦实验,分析其摩擦性能。研究发现:(1)通过FLUENT模拟软件,模拟出实验中最佳搅拌速度为200r/min;(2)处理液浓度、输出电压、处理液温度、BN浓度与膜层中BN含量之间存在非线性关系;膜层中BN含量与摩擦系数以及摩擦时间与摩擦系数之间存在非线性关系;(3)膜层主要由α-Al203、γ Al2O3及BN组成,表明电解液中BN颗粒进入到膜层中,形成了自润滑复合膜层;(4)LY12铝合金制备微弧氧化膜层最优工艺参数为KF浓度105g/L,KOH浓度85g/L,NaAlO2浓度12g/L,输出电压110V,处理液温度40℃,BN浓度10g/L,处理时间15min;本实验成功制备了含有固体润滑颗粒BN的自润滑复合膜层,确定了膜层中最优BN含量为10vol%,膜层表面摩擦系数降低至0.173;BN微粒在膜层表面均匀分布,起到了良好的自润滑作用,有效地改善了复合膜层的摩擦性能。
[Abstract]:Aluminum alloy is widely used in aviation, aerospace, transportation and other fields for its excellent physical, chemical and processing properties. But it has the shortcoming of poor wear resistance, which greatly limits its application. Therefore, it is necessary to improve the surface properties of aluminum alloy by surface treatment. As a new and green surface treatment technology, micro-arc oxidation is widely used to form oxide films with high hardness and good wear resistance and corrosion resistance on aluminum alloy surface. In this paper, the self-lubricating composite film with good compactness was prepared by adding solid lubricating particle BN, into the electrolyte by low-voltage micro-arc oxidation technology, taking LY12 aluminum alloy as the research object. The problem of "poor friction performance on film surface" existed in traditional micro-arc oxidation is solved. The surface morphology and phase composition of the film were observed by means of SEM,XRD and the tribological properties of the film were analyzed by friction experiments. The results show that: (1) the optimal stirring speed is 200 r / min by FLUENT simulation software; (2) there is a nonlinear relationship between the concentration of the treated liquid, the output voltage, the temperature of the treatment solution, the concentration of BN and the content of BN in the film. There is a nonlinear relationship between BN content and friction coefficient, friction time and friction coefficient. (3) the film is mainly composed of 伪-Al203, 纬 Al2O3 and BN, which indicates that the BN particles in the electrolyte enter into the film and form a self-lubricating composite film. (4) the optimum process parameters for the preparation of LY12 aluminum oxide coatings are as follows: KF concentration 105 g / L Koh concentration 85 g / L NaAlO 2 concentration 12 g / L, output voltage 110 V, treatment solution temperature 40 鈩，
本文编号：2321206
[Abstract]:Aluminum alloy is widely used in aviation, aerospace, transportation and other fields for its excellent physical, chemical and processing properties. But it has the shortcoming of poor wear resistance, which greatly limits its application. Therefore, it is necessary to improve the surface properties of aluminum alloy by surface treatment. As a new and green surface treatment technology, micro-arc oxidation is widely used to form oxide films with high hardness and good wear resistance and corrosion resistance on aluminum alloy surface. In this paper, the self-lubricating composite film with good compactness was prepared by adding solid lubricating particle BN, into the electrolyte by low-voltage micro-arc oxidation technology, taking LY12 aluminum alloy as the research object. The problem of "poor friction performance on film surface" existed in traditional micro-arc oxidation is solved. The surface morphology and phase composition of the film were observed by means of SEM,XRD and the tribological properties of the film were analyzed by friction experiments. The results show that: (1) the optimal stirring speed is 200 r / min by FLUENT simulation software; (2) there is a nonlinear relationship between the concentration of the treated liquid, the output voltage, the temperature of the treatment solution, the concentration of BN and the content of BN in the film. There is a nonlinear relationship between BN content and friction coefficient, friction time and friction coefficient. (3) the film is mainly composed of 伪-Al203, 纬 Al2O3 and BN, which indicates that the BN particles in the electrolyte enter into the film and form a self-lubricating composite film. (4) the optimum process parameters for the preparation of LY12 aluminum oxide coatings are as follows: KF concentration 105 g / L Koh concentration 85 g / L NaAlO 2 concentration 12 g / L, output voltage 110 V, treatment solution temperature 40 鈩，
本文编号：2321206
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