【摘要】 采用激光粒子注入/熔覆方法制备了SiCp/Al颗粒增强表面材料,所用的材料为绿色的SiCp粉末,基体为LY12铝材.激光功率为1000~1200 W,速度为3 0 mm/s,送粉量为5~10 g/min.采用扫描电镜(SEM),能谱仪器(EDX)和X射线衍射仪(XRD)研究了SiCp/Al复合表面层结构.结果发现其主要相为SiCp和Al,并含有少量的Al4SiC4 和Si.SiC颗粒均匀分布于Al基体中.激光层中的SiCp粒子具有3C,6H和5H三种晶形,其中3C和6H为SiCp的两种原始晶形,并发现了激光作用下新产生的5H晶形.更多还原

【Abstract】 SiC/Al composite coating has been produced by laser particle cladding/injection. Materials used are as follows: green SiCp powder, based materials LY12 aluminum. Laser processing parameters with P=1000～1200 W, V=3.0 mm/s and M p=5～10 g/min have been selected. Microstructure of SiC/Al composite has been examined with SEM (scanning electron microscope), EDX (energy dispersive X\|ray analyzer) and XRD (X\|ray diffractometer). It is shown that there are the main phases of SiCp particles and Al, as well as a few phases of Al 4SiC 4 and Si in the composite coating; SiC particles are uniformly distributed in Al solution; there are three crystalline forms of 3C, 6H and 5H for SiC particles in the laser coating, in which both crystalline forms of 3C and 6H belong to the original one, the new crystalline forms of 5H is produced during laser cladding.更多还原