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induction sources. The coating microstructure and the interface between bond coating and ceramic coating were characterized by SEM, XRD and EDS. The results show that two-layer substructure exists in the ceramic coating: one layer evolving from fully melted region where the sintered grains grow fully; another layer resembling the liquid-phase-sintered structure consisting of three-dimensional net where......
Corrosion resistance of micro-arc oxidized ceramic coating on cast hypereutectic alloy GUO Qiao-qin(郭巧琴)1, 2, JIANG Bai-ling(蒋百灵)1, LI Jian-ping(李建平)2, LI Gao-hong(李高宏)2, XIA Feng(夏 峰)2 1... Received 23 October 2009; accepted 23 August 2010 Abstract: The corrosion resistance of the micro-arc oxidation (MAO) ceramic coating on a cast Al-13Si-5Cu alloy was investigated using various......
of ZrO2-SiO2 molten film. Compared with the ZrO2 molten film formed on the ZrC-ZrB2 coating surface, the ZrO2-SiO2 molten film with lower oxygen diffusion rate and viscosity enables the SiC/ZrC-ZrB2... at medium temperature (800-1200 °C) [12, 21]. However, the application of Zr-based coating is seriously confined because of the low self-healing ability of ZrO2 and the loss of B2O3 above 1200 °C [15, 16......
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. The microstructure difference of the coatings formed at different stages of microarc oxidation was researched, and the growth mechanism of ceramic coating on aluminium alloy was discussed. The results... little. Since the prefab coating is participated in the process of forming ceramic coating, the prefab coating is prepared on the aluminum alloy surface, it is helpful to shortening arc starting time......
Catalytic graphitization of polyacrylonitrile (PAN)-based carbon fibers with Fe-Cr2O3 composite coating HUANG Zhen-hua(黄振华)1, ZHOU Hai-hui(周海晖)1, 2, PENG Qi-ling(彭奇龄)1, CHEN Jin-hua(陈金华)1, 2...; Abstract: The process of electrodepositing Fe-Cr2O3 composite coating on polyacrylonitrile (PAN)-based carbon fibers and its catalytic graphitization were......
oxidization; wear; corrosion; ceramic coating 1 Introduction Magnesium is intrinsically highly reactive and its alloys usually have relatively poor corrosion and wear resistance, which is actually... coating formed on Mg alloy contributed greatly to improve the wear and corrosion resistance of Mg alloy[7-8]. In this work, the MAO was applied to synthesize ceramic coatings on the surface of AZ91D......
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阳极氧化ZrO2 纳米管阵列的制备及其生长机制曹华珍,尹意淳,郑国渠(浙江工业大学 化学工程与材料学院,杭州 310014)摘 要:在含NH4F 的聚乙二醇(PEG-200)电解液中通过阳极氧化制备高度有序的二氧化锆纳米管阵列(ZrO2-NTs).考察氧化电压,氧化时间以及电解液水含量对ZrO2-NTs 形貌的影响,并讨论其生长机制,采用等效电路Rs(QfRf)(QdRc)对ZrO2-NTs 的电化学阻抗谱进行拟合.结果表明,在该体系中ZrO2-NTs 的形成包括氧化,水解形核以及膜溶解过程,氧化电压,氧化时间以及电解液水含量是影响ZrO2-NTs 生长的重要因素,在含1.0% NH4F(质量分数)和5% H2O(体积分数)的PEG-200 电解液中,20 V 电压下氧化3 h 可制备得到管径为100~120 nm 的ZrO2-NTs.电化学阻抗谱分析结果表明,ZrO2 膜层的界面电荷转......
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