喷涂Al／SiC复合材料的制备与组织分析

采用等离子喷涂技术和亚音速火焰喷涂技术制备了高性能Al／SiC复合材料。利用OM，SEM，TEM，XRD等仪器详细分析了上述两种技术制备的Al／SiC复合材料微观组织。结果显示，亚音速火焰喷涂技术和等离子喷涂技术均可制备出SiC体积分数大于50％的Al／SiC复合材料，所制备的Al／SiC复合材料组织致密、颗粒均匀分布、SiC颗粒和Al之间的界面结合良好。XRD研究表明，等离子喷涂Al／SiC复合材料中存在着Al，SiC，晶体Si等相。亚音速火焰喷涂Al／SiC复合材料中的相是由Al，SiC和少量的Al2O3组成。与等离子喷涂相比，亚音速火焰喷涂Al／SiC复合材料的孔隙率较高，氧化程度较高。此外等离子喷涂Al／SiC复合材料中有一定量纳米尺度的晶粒和颗粒。

Fabrication and Structure Analysis of Sprayed Al/SiC Composite with High Performance

High performance Al/SiC composite was fabricated by both plasma spraying and subsonic flame spraying techniques. Based on the techniques, the microstructures of high performance AL/SiC composite were analyzed in detail by means of OM, SEM, TEM and XRD The result revealed that Al/SiC composite with SiC volume fraction over 50% could be fabricated by the two above techniques, and the microstructures of the composite were uniform and dense. At the same time, the interfaces between SiC particle and Al bonded well. The XRD test result showed that the composite by plasma spraying consisted of SiC and Al, along with crystal Si. While SiC and Al were main phases in the flame sprayed composite, and a few Al2O3 was found in the composite. Compared to the plasma spraying composite, the composite oxidation and porosity made through flame spraying were a little higher. Meanwhile, a few nano-grain and particle were found in the plasma sprayed composite.