Preparation and high-temperature properties of Au nano-particles doped α-Al2O3 composite coating on TiAl-based alloy

被引：30

作者：

Ma, Xiaoxu ^{[1
]}

He, Yedong ^{[1
]}

Wang, Deren ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Beijing Key Lab Corros Eros & Surface Technol, Beijing 100083, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2011年 / 257卷 / 23期

关键词：

Nanocomposites; Mechanical properties; Thermal shock resistance; Al2O3; High-temperature oxidation; MECHANICAL-PROPERTIES; BEHAVIOR; DIFFUSION; OXYGEN; FILMS;

D O I：

10.1016/j.apsusc.2011.07.041

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Au nano-particles doped alpha-Al2O3 composite coatings were successfully prepared on TiAl-based alloy by electrodeposition, using the Al2O3 sols with minor addition of HAuCl4 solution. The even distribution of Au nano-particles (<2.0 wt.%) in the alpha-Al2O3 matrix has been observed. Isothermal oxidation tests of the samples coated with the as-prepared novel coatings at 900 degrees C in static air for 200 h shown that the oxygen inward diffusion can be effectively suppressed to a low level. The results of high-temperature cyclic oxidation test at 900 degrees C in air revealed that the oxidation and spallation resistance of TiAl-based alloy were improved significantly under thermal cycling. In the as-prepared coatings, cracks were shielded by means of crack bridging and the fracture resistance of the formed scales can be improved by toughening effects of the composite structure. Surface scratching tests after the cyclic oxidation exhibited that the adhesion of the formed composite scale on TiAl-based alloy was remarkably improved by the Au nano-particles doped alpha-Al2O3 composite coating. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：10273 / 10281

页数：9

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