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研究了一种Ti诱导反应熔体无压浸渗制备复合材料的方法:通过凝胶注模成型工艺,以蔗糖为造孔剂制备了多孔Ti-WC陶瓷骨架预制体,真空状态下,在1370℃以Fe-Cr-C合金熔体无压浸渗该预制体,经过原位反应制备了(W,Ti)C/Fe复合材料。利用SEM-EDS、XRD对复合材料的组织结构、元素组成及相组成进行了测试和分析。采用旋转圆盘式摩擦试验机以SiC砂浆为磨料研究了(W,Ti)C/Fe复合材料的耐磨性。结果表明:在浸渗过程中骨架中的Ti元素的溶解析出与C元素的原位反应促进了浸渗过程的进行,在1370℃保温1h,金属液即渗透整个多孔骨架,并且在浸渗过程中仍然维持着骨架的形状,浸渗过程中Ti-C-WC原位反应生成具有芯-壳结构的中间富Ti、边缘富W的(W,Ti)C增强相。摩擦磨损实验结果表明,(W,Ti)C/Fe复合材料具有优异的抗磨粒磨损性能,其耐磨性优于工业用耐磨铸铁。
A method for preparing composites by pressureless impregnation of Ti-induced reaction melt was studied: a porous Ti-WC ceramic framework preform was prepared by gel injection molding with sucrose as pore-forming agent. Under vacuum, ℃, the preform was infiltrated into the Fe-Cr-C alloy melt without pressure and the (W, Ti) C / Fe composites were prepared by in-situ reaction. The microstructure, elemental composition and phase composition of the composites were tested and analyzed by SEM-EDS and XRD. The abrasion resistance of (W, Ti) C / Fe composites was studied by using a rotating disc friction tester with SiC mortar as the abrasive. The results show that the dissolution of Ti element and the in-situ reaction of C element promote the infiltration process during the infiltration process. When the solution is incubated at 1370 ℃ for 1h, the molten metal penetrates the porous skeleton, and during impregnation (W, Ti) C enhanced phase with core-shell structure in the impregnation process. Friction and wear test results show that (W, Ti) C / Fe composites have excellent wear resistance and abrasion resistance, which is better than that of industrial wear-resistant cast iron.