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首页> 外文期刊>Applied Surface Science >Preparation And High-Temperature Properties Of Au Nano-Particles Doped A-Al_2O_3 Composite Coating On Tial-Basfcd Alloy
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Preparation And High-Temperature Properties Of Au Nano-Particles Doped A-Al_2O_3 Composite Coating On Tial-Basfcd Alloy

机译：在Tial-Basfcd合金上掺杂Au-Al_2O_3的Au纳米颗粒复合涂层的制备及高温性能

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摘要

Au nano-particles doped a-Al_2O_3 composite coatings were successfully prepared on TiAl-based alloy by electrodeposition, using the AI_2O_3 sols with minor addition of HAuCl_4 solution. The even distribution of Au nano-particles (<2.0 wt.%) in the CX-AI_2O_3 matrix has been observed. Isothermal oxidation tests of the samples coated with the as-prepared novel coatings at 900 °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 °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 a-Al_2O_3 composite coating.
机译：使用Al_2O_3溶胶并少量添加HAuCl_4溶液，通过电沉积在TiAl基合金上成功制备了Au纳米颗粒掺杂的a-Al_2O_3复合涂层。已经观察到CX-AI_2O_3基体中金纳米颗粒的均匀分布（<2.0重量％）。在900℃的静态空气中对制备好的新型涂层进行的样品等温氧化试验表明，在900°C的条件下，氧的向内扩散可以有效地抑制到较低水平。空气中900°C高温循环氧化试验的结果表明，在热循环下，TiAl基合金的抗氧化性和抗剥落性得到了显着改善。在所制备的涂层中，通过裂纹桥接来遮蔽裂纹，并且可以通过复合结构的增韧作用来改善所形成的氧化皮的耐断裂性。循环氧化后的表面刮擦试验表明，通过掺杂Au纳米颗粒的a-Al_2O_3复合涂层，明显改善了复合鳞片在TiAl基合金上的附着力。

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  • 来源
    《Applied Surface Science》 |2011年第23期|p.10273-10281|共9页
  • 作者

    Xiaoxu Ma; Yedong He; Deren Wang;

  • 作者单位

    Beijing Key Laboratory for Corrosion, Erosion and Surface Technology, University of Science and Technology Beijing, 100083 Beijing, China;

    Beijing Key Laboratory for Corrosion, Erosion and Surface Technology, University of Science and Technology Beijing, 100083 Beijing, China;

    Beijing Key Laboratory for Corrosion, Erosion and Surface Technology, University of Science and Technology Beijing, 100083 Beijing, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Nanocomposites; Mechanical properties; Thermal shock resistance; AI_2O_3; High-temperature oxidation;

    机译：纳米复合材料;力学性能;耐热冲击性;AI_2O_3;高温氧化;

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