( 1. 西北工业大学 凝固技术国家重点实验室, 西安 710072;
2.西安无人机研究发展中心, 西安 710072)
摘 要: 采用无压浸渗工艺, 制备出高含量Sip/Al复合材料。 对无压浸渗过程进行了静力学分析， 对无压浸渗机制进行了研究， 并采用电阻法对Al液无压浸渗Si松装多孔体的动力学过程进行了实时测量。 结果表明： Al液浸渗Si多孔预制体符合浸渗静力学条件， 其实际浸渗过程符合抛物线关系。 组织观察结果表明, Si相呈网络状连续分布， 其形成机制主要为浸渗时Si颗粒的溶解-析出机制和凝固过程中Si的附着析出机制。 组织中存在少量的孔隙。 复合材料的界面清洁平整, 未发现有反应物存在。
关键字: 无压浸渗； 热控制材料； Sip/Al复合材料
（ 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;
2. Xi'an Pilotless Aircraft Research and Development Center, Xi'an 710072, China）
Abstract: High content Sip /Al composites were fabricated by pressureless infiltration. The statics of infiltration process were analyzed. It is indicated that aluminum melting liquid can infiltrate silicon loose packing porous preform because it conforms to the requirements of statics. The dynamics process that aluminum melt liquid infiltrates silicon loose packing porous preform was analyzed by resistant measurement method at real time. The results show that an approximate parabola curve of infiltration depth versus infiltration time is proved. It is indicated that the main mechanisms of continuous netlike Si phase are dissolution-deposition and appendiculate deposition of Si. The form-mechanism of few fine pores in the microstructure was investigated. The interface of Sip/Al phases is clean and no reactants exist.
Key words: pressureless infiltration; thermal management material; Sip /Al composites
