( 1. 西北工業(yè)大學 凝固技術國家重點實驗室, 西安 710072;
2.西安無人機研究發(fā)展中心, 西安 710072)
摘 要: 采用無壓浸滲工藝, 制備出高含量Sip/Al復合材料。 對無壓浸滲過程進行了靜力學分析， 對無壓浸滲機制進行了研究， 并采用電阻法對Al液無壓浸滲Si松裝多孔體的動力學過程進行了實時測量。 結果表明： Al液浸滲Si多孔預制體符合浸滲靜力學條件， 其實際浸滲過程符合拋物線關系。 組織觀察結果表明, Si相呈網絡狀連續(xù)分布， 其形成機制主要為浸滲時Si顆粒的溶解-析出機制和凝固過程中Si的附著析出機制。 組織中存在少量的孔隙。 復合材料的界面清潔平整, 未發(fā)現(xiàn)有反應物存在。
關鍵字: 無壓浸滲； 熱控制材料； Sip/Al復合材料
LI Jin-shan1, FU Heng-zhi1
（ 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
