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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Microstructure and mechanical properties of aluminium alloy coatings on alumina applied by friction surfacing
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Microstructure and mechanical properties of aluminium alloy coatings on alumina applied by friction surfacing

机译：铝合金涂层铝合金涂布铝合金涂层施加摩擦散布

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摘要

By combining lightweight metal alloys with ceramics, it is possible to adapt material properties on stressed parts and thus increase stiffness and/or change the thermal resistance: yet joining such materials is problematic due to the poor wettability of ceramics by molten metals. In this work, the technique of friction surfacing is used to connect alumina (Al2O3) with an aluminium alloy (EN-AW 5083). Despite the fact that Al2O3 has a relatively high coefficient of thermal expansion and a low thermal shock resistance, specimens have been produced showing encouraging results. In order to compensate for these material properties the substrate was preheated to a minimum of 150 degrees C. In tests bonding strengths reached 47.8 MPa and coating thicknesses of 213 mu m were achieved; results which are comparable with conventional thermally sprayed coatings. Bonding strengths were determined by using a pull-off adhesion tester and the coating thickness was measured with a laser scanning microscope. Analysis of the joint zone shows no clear evidence of chemical reactions (intermetallic compounds) or diffusion. Mechanical interlocking can only be shown to be accountable for 16% of the bonding strength with investigations turning towards van der Waals forces and their contribution to adhesion.
机译：通过将轻质金属合金与陶瓷组合，可以使材料特性适应应力部分，从而增加刚度和/或改变热阻：由于熔融金属的陶瓷润湿性差，因此加入的这种材料是有问题的。在这项工作中，摩擦表面处理技术用于将氧化铝（Al 2 O 3）与铝合金（EN-AW 5083）连接。尽管Al2O3具有相对高的热膨胀系数和低热抗震系数，但已经产生了令人鼓舞的结果。为了补偿这些物质性质，将基板预热至至少150℃。在测试中，达到47.8MPa的粘合强度和213μm的涂层厚度;与常规的热喷涂涂层相当的结果。通过使用拉出粘附测试仪测定粘合强度，用激光扫描显微镜测量涂层厚度。关节区的分析显示没有明确的化学反应（金属间化合物）或扩散证据。机械互锁只能显示为16％的粘合强度负责，调查转向范德华势力及其对粘附的贡献。

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