铝合金微弧氧化复合工艺制备陶瓷膜的油摩擦特性
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摘要
为改善7075铝合金微弧氧化陶瓷膜性能,利用恒流-恒压复合工艺制备微弧氧化陶瓷膜。采用涂层厚度仪、显微硬度计测量陶瓷膜厚度、显微硬度;采用扫描电镜(SEM)和X射线衍射仪(XRD)分析陶瓷膜的表面形貌、磨痕形貌和相组成;采用摩擦磨损试验机研究陶瓷膜油摩擦特性。结果表明:在氧化时间为75 min(恒流)-30 min(恒压)时,陶瓷膜平均厚度达到81μm,陶瓷膜致密层硬度达到1648 HV;陶瓷膜主要由α-Al_2O_3和γ-Al_2O_3组成;微弧氧化陶瓷膜微孔结构有利于改善油润滑条件下的耐磨性;在油润滑条件下,摩擦系数和磨损量随着转速的增大而变大。
In order to improve the properties of ceramic coating on 7075 aluminum alloy by micro-arc oxidation(MAO),the method of constant current mode combining with constant voltage mode was used to prepare the ceramic coating. The thickness and hardness of the coating were measured by coating thickness meter and micro Vickers hardness measurer. The surface morphologies,wear scar morphology and phase composition were analyzed by scanning electron microscope(SEM)and X-ray diffraction(XRD). The wear resistance under oil lubrication was studied by friction and wear tester. The results show that the average thickness and hardness reach 81 μm and 1648 HV, respectively, when the oxidation time is 75 min for constant current mode and the oxidation time is 30 min for constant voltage mode. The ceramic coating primarily consists ofα-Al_2O_3 and γ-Al_2O_3. The micro-cavities in the ceramic coating are able to improve the wear resistance under oil lubricating.Under oil lubrication, the friction coefficient and wear mass loss increase with the rotational velocity increasing.
In order to improve the properties of ceramic coating on 7075 aluminum alloy by micro-arc oxidation(MAO),the method of constant current mode combining with constant voltage mode was used to prepare the ceramic coating. The thickness and hardness of the coating were measured by coating thickness meter and micro Vickers hardness measurer. The surface morphologies,wear scar morphology and phase composition were analyzed by scanning electron microscope(SEM)and X-ray diffraction(XRD). The wear resistance under oil lubrication was studied by friction and wear tester. The results show that the average thickness and hardness reach 81 μm and 1648 HV, respectively, when the oxidation time is 75 min for constant current mode and the oxidation time is 30 min for constant voltage mode. The ceramic coating primarily consists ofα-Al_2O_3 and γ-Al_2O_3. The micro-cavities in the ceramic coating are able to improve the wear resistance under oil lubricating.Under oil lubrication, the friction coefficient and wear mass loss increase with the rotational velocity increasing.
引文
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[2]王平,郭小阳,王春华,等.电流密度对ZL108铝合金微弧氧化膜性能的影响[J].稀有金属材料与工程,2012,41(S2):174-177.
[3]陈喜娣,蔡启洲,尹荔松.占空比对6061铝合金微弧氧化膜层结构与耐蚀性的影响[J].特种铸造及有色合金,2011,31(7):671-675.
[4]葛延峰,蒋百灵,时惠英.电流脉冲宽度对铝合金微弧氧化过程的影响[J].材料热处理学报,2013,34(10):165-169.
[5]李淑华,沈大为,祖媛媛,等.2A06铝合金表面微弧氧化陶瓷层摩擦学特性[J].稀有金属材料与工程,2014,43(1):154-157.
[6]葛灵丹,王树奇,杨子润.7075铝合金的磨损行为及其机理探讨[J].特种铸造及有色合金,2011,31(2):178-182.
[7]洪尚坤,黎清宁,屈婧婧,等.阴阳极电流密度比对7075铝合金微弧氧化陶瓷膜特性的影响[J].热加工工艺,2015,44(2):182-185.
[8]蒋百玲,朱静,白力静.铝合金微弧氧化陶瓷膜层在润滑条件下的抗磨性能研究[J].摩擦学学报,2004,24(3):220-223.
[9]王艳秋,王岳,陈派明,等.7075铝合金微弧氧化涂层的组织结构与耐蚀耐磨性能[J].金属学报,2011,47(4):455-461.