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研究了熔法制备SiCp/ZA27复合材料的凝固特性。指出熔剂通过改变颗粒表面物理结构和化学特性,引起反应润湿,造成熔体的成分起伏并优化结晶条件,使得复合材料宏观上仍以糊状方式凝固,但在颗粒微区内,凝固方式从颗粒表层至熔体中心由中间凝固,甚至逐层凝固,向糊状凝固方式过渡,经凝固过程固液界面行为分析,提出颗粒花瓣式生长模型、颗粒吞没模型和颗粒推移模型;并证实,控制合适的熔剂层厚度和配比能够实现颗粒吞没机制,使颗粒处于晶内,此时颗粒分布均匀、组织致密、界面结合强。
The solidification properties of SiCp / ZA27 composites prepared by melt method were studied. It is pointed out that flux changes the physical structure and chemical properties of the particle surface to cause the reaction to wet and cause the composition of the melt to fluctuate and optimize the crystallization conditions so that the composite material still solidifies in the form of a paste macroscopically macroscopically. Particle surface to melt center by the middle of solidification, and even layer by layer solidification, transition to pasty solidification, the solid-liquid interface behavior analysis of the solidification process, proposed particle petal growth model, particle swallow model and particle transfer model; and confirmed that the control Appropriate flux layer thickness and the ratio can achieve the mechanism of particle swallow, so that the particles in the crystal, when the particles are evenly distributed, dense tissue, strong interface.