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. High feed pressure of SiC particles is beneficial to the capture and uniform distribution of SiC particles. The optimized processing parameters of multi-layer spray deposited SiC_P/Al-8.5Fe-1.3V-1.7Si composites are: flow diameter of 3.6 mm, atomization pressure of 0.8 MPa, spray height of 200 mm, and SiC particle feed pressure of 0.5 MPa. SiC-Al interface of crastalline Si and amorphous SiO₂ are found in the deposit.