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采用多层喷射沉积工艺制备SiCP/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SiCP/Al-8.5Fe-1.3V-1.7Si的优化工艺参数为:液流直径3.6mm,雾化气体压力0.8MPa,喷射高度200mm,SiC颗粒输送压力0.5MPa。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。
SiCP / Al-8.5Fe-1.3V-1.7Si composites were prepared by multi-layer spray deposition. The effects of atomization and deposition parameters on the deposition state and SiC particle capture were studied. The results show that the flow diameter is large, the pressure of the atomizing gas is small, and the jet height is small, which leads to the deterioration of the microstructure of the deposited billet. Otherwise, the yield is low and the density is low. Uneven atomization of the nebulizer results in uneven shape of the deposit and deterioration of the microstructure due to heat concentration. SiC particle transport pressure is conducive to the capture of SiC particles and the uniform distribution of particles. The optimum technological parameters of SiCP / Al-8.5Fe-1.3V-1.7Si prepared by multilayer spray deposition are as follows: the flow diameter is 3.6mm, the atomizing gas pressure is 0.8MPa, the spraying height is 200mm, and the conveying pressure of SiC particles is 0.5MPa. There are two SiC-Al interfaces in the deposit: the crystalline Si interfacial layer and the amorphous SiO2 interfacial layer.