Kamaal Al-hamdani, Moheimen Al-Thamir, Mohammed Jameel Sahi, A. A. Abed
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引用次数: 0
摘要
使用金属基复合材料涂层是一种很有前途的方法，可以提高部件的表面性能，抵御机械和环境的侵蚀，特别是磨损和腐蚀。激光熔覆（LC），又称直接能量沉积（DED），是一种快速成型制造（AM）技术，能够进行涂层、修复磨损部件、制造和原型开发。在这项工作中，成功地在铝基基底上沉积了纯铝和多陶瓷 Al-15SiC-15Al2O3 涂层的混合物。根据宏观图形、微观结构和显微硬度特征对沉积覆层的质量进行了评估。多陶瓷涂层的显微镜检查显示，SiC 颗粒略有稀释。此外，XRD 研究还发现了 Al4C3 碳化物的形成。除了 SiC 和 Al2O3 硬质相之外，与纯 Al 堆焊层相比，基体显微硬度增加了约 180%（从 75 Hv0.05 增加到 212 Hv0.05），这表明复合堆焊涂层的机械性能得到了极大改善。
Deposition of Multi-Ceramic Aluminium-Matrix Composite Coating by Direct Laser Deposition
Using of metal matrix composite coating is a promising approach for improving the surface properties of a component against the mechanical and environmental attacks especially wear and corrosion. Laser cladding (LC), also known as direct energy deposition (DED), is an additive manufacturing (AM) technique, able to perform coating, repair worn parts, manufacturing and prototyping. In this work, pure Al and a mixture of multi-ceramic Al-15SiC-15Al2O3 coatings were successfully deposited on Al-based substrate. The quality of the deposited clads was evaluated according to macro-graphic, microstructure, and microhardness characteristics. The microscopic inspection of the multi-ceramic coatings showed a slight dilution of SiC particles. Also, XRD investigation revealed a formation of Al4C3 carbide. Besides SiC and Al2O3 hard phases, this yielded an increase in matrix microhardness about 180% (from 75 to 212 Hv0.05) as compared to pure Al clads, indicating a great improvement in the mechanical properties of the composite cladded coating.
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