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Ti诱导反应熔体无压浸渗法制备(W,Ti)C/Fe复合材料

, PP. 119-125

Keywords: (W,Ti)C/Fe复合材料,无压浸渗,原位反应,多孔材料,凝胶注模

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Abstract:

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。

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