摘要
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。
This paper conducted on the solidification of SiCp/ZA27 composites. It noted that through flux treatment it changed the physical structure and chemical property of SiC particle, simultaneously caused chemisty undulation and improved the condition of crystallization It also caused that the composites soldified in the way of pastesolidification but in the micro-region of SiC the way of solidfication changed from mid-solidification,even layersoldificaioion into paste-solidification from the surface of SiC to the center of the melt. Through analyzing the performances of solid-liquid interface, we advanced the model of particle embezzling,the model of petal-growth and the model of particle pushing,We verified that the suitable flux-layerthickness could realize the first model. And now the SiCp/ZA27 composites was more homogenous and fine in microstructure, and had a good interface cohesion.
出处
《铸造设备研究》
2000年第1期15-18,44,共5页
Research Studies On Foundry Equipment
