Electrophoretic deposition of Al2O3/ZrO2 layer with controllable thickness in ethanol medium

Chun-mei YANG; Xian-chun CHEN; Xiao-ming LIAO; Zhong-bing HUANG; Ya-dong YAO; Guang-fu YIN

doi:10.1007/s11458-011-0240-y

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Front. Chem. China ›› 2011, Vol. 6 ›› Issue (2) : 76-83. DOI: 10.1007/s11458-011-0240-y

RESEARCH ARTICLE

Electrophoretic deposition of Al₂O₃/ZrO₂ layer with controllable thickness in ethanol medium

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Abstract

ZrO₂ toughened Al₂O₃ (Al₂O₃/ZrO₂) ceramic layers with required thickness were prepared by electrophoretic deposition (EPD) method using ethanol suspensions with stabilizing agent of polyethyleneimine (PEI) under constant-voltage mode in this paper. The deposition of Al₂O₃/ZrO₂ ceramic powders occurred on the titanium alloy cathode. A stable suspension with 1wt% PEI in ethanol at pH 5 was prepared in terms of the zeta potential and sedimentation of the suspension. The effects of the suspension concentration, applied voltage, deposition time and processing method of titanium alloy cathode on the coating thickness and morphology were investigated. The deposition layers on titanium alloys with smooth surfaces and thickness of 0.35–1.2 mm could be obtained by adjusting the aforementioned parameters. In addition, after being sintered at 1500°C for 3 h in air atmosphere, ZrO₂ toughened Al₂O₃ ceramic layers became smooth and dense.

Keywords

electrophoretic deposition / suspension / Al₂O₃ / ZrO₂

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Chun-mei YANG, Xian-chun CHEN, Xiao-ming LIAO, Zhong-bing HUANG, Ya-dong YAO, Guang-fu YIN. Electrophoretic deposition of Al₂O₃/ZrO₂ layer with controllable thickness in ethanol medium. Front Chem Chin, 2011, 6(2): 76‒83 https://doi.org/10.1007/s11458-011-0240-y

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 60871062 and 50873066) and Distinguished Young Scholars of Sichuan Province (08ZQ026-007). The supports from Sichuan Province through a Science Fund for Key Technologies Research and Development Program of Sichuan Province (2008SZ0021 and 2006Z08-001-1) are also acknowledged with gratitude.