钛合金表面梯度Al2O3陶瓷涂层的高温抗氧化性能*

doi:10.11896/j.issn.1005-023X.2017.014.012

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Abstract Aiming at mitigating the high-temperature oxidation of titanium alloy which causes mechanical properties deterioration and lifetime reduction, a gradient composite coating composed of gradient alumina (ZrO₂+Al₂O₃) and Al₂O₃ via a sol-gel me-thod (with the advantage of ease of composition control) on the surface of TC11 titanium alloy. Experiment were carried out among gradient coating,Al₂O₃ coating and matrix,and an oxidation rate of 0.015 mg²/ (cm⁴·h) and an oxidation index of 2.137 for the gradient coating were obtained from the fitting results of weight gain data after 700 ℃-100 h oxidation. It can be concluded that the high-temperature oxidation resistance of the gradient coating is better than the others taking into account weight gain curve and EDS analysis upon the oxidized samples. Thermal shock test at 700 ℃ confirms the better match of thermal expansion coefficient between matrix and Al₂O₃ outer layer for gradient coating (ZrO₂+Al₂O₃), inferring the mitigation effect due to the chemical composition gradient to the mismatch which further benefits the promotion of resistance toward high-temperature oxidation and lifetime prolongation of titanium alloy matrix.

Key words： sol-gel titanium alloy high-temperature oxidation resistance thermal expansion coefficient gradient

Published: 04 May 2018

CLC number:

TG174.45

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	Articles by authors
	DU Wenbo
	YAO Zhengjun
	TAO Xuewei
	LUO Xixi

Cite this article:

DU Wenbo,YAO Zhengjun,TAO Xuewei, et al. High-temperature Anti-oxidation Property of Al₂O₃ Gradient Composite Coatings on TC11 Alloys[J]. Materials Reports, 2017, 31(14): 57-60.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.014.012 OR http://www.mater-rep.com/EN/Y2017/V31/I14/57

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