Effects of Dissimilar Alumina Particulates on Microstructure and Properties of Cold-Sprayed Alumina/A380 Composite Coatings
来源期刊：Acta Metallurgica Sinica2019年第12期
论文作者：Xiang Qiu Naeem ul Haq Tariq Lu Qi Jun-Rong Tang Xin-Yu Cui Hao Du Ji-Qiang Wang Tian-Ying Xiong
文章页码：1449 - 1458
摘 要：In this study,alumina/A380 composite coatings were fabricated by cold spray.The influence of alumina particulates’ morphology（spherical and irregular） and content on the deposition behavior of the coatings（including surface roughness,surface residual stress,cross-sectional microstructure and microhardness） was investigated.Results revealed that the spherical alumina mainly shows micro-tamping effect during deposition,which result in remarkable low surface roughness and porosity of the coatings.In addition,very low deposition efficiency and good interfacial bonding between the coating and the substrate were achieved.For irregular alumina particles,the embedding of ceramic particulates in the coating was dominant during deposition process,resulting in high retention in the final deposit.However,it showed limited influence on porosity,surface roughness and interfacial bonding of the deposit.The coatings containing irregular alumina particulates exhibited much higher microhardness than those containing spherical alumina due to the higher load-bearing capacity of deposited alumina.
Xiang Qiu1,2，Naeem ul Haq Tariq1,3,4，Lu Qi1,2，Jun-Rong Tang1,2，Xin-Yu Cui1，Hao Du1，Ji-Qiang Wang1，Tian-Ying Xiong1
1. Institute of Metal Research, Chinese Academy of Sciences2. School of Materials Science and Engineering , University of Science and Technology of China3. University of Chinese Academy of Sciences4. Department of Metallurgy and Materials Engineering , Institute of Engineering and Applied Sciences
摘 要：In this study,alumina/A380 composite coatings were fabricated by cold spray.The influence of alumina particulates’ morphology（spherical and irregular） and content on the deposition behavior of the coatings（including surface roughness,surface residual stress,cross-sectional microstructure and microhardness） was investigated.Results revealed that the spherical alumina mainly shows micro-tamping effect during deposition,which result in remarkable low surface roughness and porosity of the coatings.In addition,very low deposition efficiency and good interfacial bonding between the coating and the substrate were achieved.For irregular alumina particles,the embedding of ceramic particulates in the coating was dominant during deposition process,resulting in high retention in the final deposit.However,it showed limited influence on porosity,surface roughness and interfacial bonding of the deposit.The coatings containing irregular alumina particulates exhibited much higher microhardness than those containing spherical alumina due to the higher load-bearing capacity of deposited alumina.
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