( 1. 西北工業(yè)大學(xué) 凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室, 西安 710072;
2.西安無人機(jī)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(fù)合材料。 對(duì)無壓浸滲過程進(jìn)行了靜力學(xué)分析， 對(duì)無壓浸滲機(jī)制進(jìn)行了研究， 并采用電阻法對(duì)Al液無壓浸滲Si松裝多孔體的動(dòng)力學(xué)過程進(jìn)行了實(shí)時(shí)測(cè)量。 結(jié)果表明： Al液浸滲Si多孔預(yù)制體符合浸滲靜力學(xué)條件， 其實(shí)際浸滲過程符合拋物線關(guān)系。 組織觀察結(jié)果表明, Si相呈網(wǎng)絡(luò)狀連續(xù)分布， 其形成機(jī)制主要為浸滲時(shí)Si顆粒的溶解-析出機(jī)制和凝固過程中Si的附著析出機(jī)制。 組織中存在少量的孔隙。 復(fù)合材料的界面清潔平整, 未發(fā)現(xiàn)有反應(yīng)物存在。
關(guān)鍵字: 無壓浸滲； 熱控制材料； Sip/Al復(fù)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
