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首页> 外文期刊>Surface Engineering >Microstructure and wear resistance of Al2O3-TiB2 composite coating deposited by axial plasma spraying
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Microstructure and wear resistance of Al2O3-TiB2 composite coating deposited by axial plasma spraying

机译：轴向等离子喷涂Al 2 O 3 -TiB 2 复合涂层的组织和耐磨性

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Two Al2O3-TiB2 composite coatings were deposited by axial plasma spray using two types of feedstocks. One of the feedstocks was a conventional micrometre sized Al2O3-30 wt-%TiB2 composite powder from a self-propagating high temperature synthesis (SHS) process. The second was fabricated by spray drying SHSed Al2O3-30 wt-%TiB2 composite powder doped with 10 mass-% nanosized Al2O3 powder. The microstructure of the feedstocks and as sprayed coatings were comparatively investigated by scanning electron microscope and X-ray diffraction. Wear resistance of as sprayed coatings were assessed using block on ring wear test at room temperature. Results showed that Al2O3-TiB2 composite coatings were composed of α-Al2O3, γ-Al2O3, TiB2 and a small amount of TiO2. TiB2 that mostly remained in the shape of undeformed particle were dispersedly distributed in the matrix of the composite coatings. The coating from spray dried powder exhibited finer and denser microstructure and demonstrated better wear resistance than the coating from the SHSed powder under the same sliding conditions.
机译：使用两种原料通过轴向等离子喷涂沉积了两个Al 2 O 3 -TiB 2 复合涂层。原料之一是常规的微米级Al 2 O 3 -30 wt-％TiB 2 自蔓延高温复合粉末综合（SHS）过程。第二种是通过喷雾干燥掺有10质量％的纳米Al的SHSed Al 2 O 3 -30 wt％TiB 2 复合粉末而制成的 2 O 3 粉末。通过扫描电子显微镜和X射线衍射比较研究了原料和喷涂涂层的微观结构。在室温下使用环上块磨损试验评估喷涂涂层的耐磨性。结果表明，Al 2 O 3 -TiB 2 复合涂层由α-Al 2 O 3 ，γ-Al 2 O 3 ，TiB 2 和少量TiO 2 。 TiB 2 主要以未变形颗粒的形式分散在复合涂层的基体中。在相同的滑动条件下，由喷雾干燥粉末制成的涂层比由SHSed粉末制成的涂层具有更好的致密微观结构，并具有更好的耐磨性。

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