多层喷射共沉积制备 SiCP/Al-8.5Fe-1.3V-1.7Si复合材料

采用多层喷射沉积工艺制备SiC_P/Al-8.5Fe-1.3V-1.7Si复合材料, 研究了雾化及沉积工艺参数对沉积坯状态及SiC颗粒捕获的影响。结果表明, 液流直径大、雾化气体压力小、喷射高度小会导致沉积坯组织恶化, 反之则造成收得率低、致密度低。雾化器扫描不均匀则会造成沉积坯形状不均匀, 而且会由于热量集中导致显微组织恶化。SiC颗粒输送压力的提高有利于SiC颗粒的捕获以及颗粒的均匀分布。多层喷射沉积制备SiC_P/Al-8.5Fe-1.3V-1.7Si的优化工艺参数为: 液流直径3.6 mm, 雾化气体压力0.8 MPa, 喷射高度200 mm, SiC 颗粒输送压力0.5 MPa。 沉积坯存在两种SiC-Al界面: 晶态Si界面层与非晶态SiO₂界面层。

SiC_P/Al-8.5Fe-1.3V-1.7Si composites prepared by multi-layer spray co-deposition

Effects of the atomization and deposition processing parameters on SiC P / Al-8.5Fe-1.3V-1.7Si composites deposit prepared by multi-layer spray deposition were investigated, and effects of the processing parameter on the capture of SiC particles were also studied. The results show that big flow diameter, low atomization pressure and low spray height result in weak microstructure, while small flow diameter, high atomization pressure and big spray height result in low collection ratio and low density. Non-uniform scanning of atomizer leads to non-uniform deposit and coarse microstructure. And high feed pressure of SiC particles is beneficial to the capture and uniform distribution of SiC particles. Therefore, optimized processing parameters of multi-layer spray deposited SiC P /Al-8.5Fe-1.3V-1.7Si composites are: flow diameter of 3.6mm, atomization pressure of 0.8MPa, spray height of 200mm, and SiC particle feed pressure of 0.5MPa. SiC-Al interface of crastalline Si and amorphous SiO 2 are found in the deposit.