Ti诱导反应熔体无压浸渗法制备Fe-Al_2O_3-TiC复合材料  

PROCESSING OF Fe-Al_2O_3-TiC COMPOSITES BY PRESSURELESS TI-ACTIVATED REACTIVE MELT INFILTRATION

作　　者：石永亮[1] 郭志猛[1] 郝俊杰[1] 林涛[1] 曾鲜[1] 

机构地区：[1]北京科技大学新材料技术研究院,北京100083

出　　处：《粉末冶金工业》2012年第5期13-18,共6页Powder Metallurgy Industry

基　　金：国家自然科学基金委员会资助(No.50774010);国家教育部回国人员科研启动基金资助项目;广东省教育部产学研结合项目(2011A090200091)

摘　　要：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:通过凝胶注模成形工艺,以蔗糖为造孔剂制备了Ti-Al2O3多孔陶瓷骨架预制体,真空状态下,在1370℃以Fe-2Cr-3C合金熔体无压浸渗该预制体,经过原位反应制备了Fe-Al2O3-TiC复合材料。并利用SEM、X射线衍射对复合材料的组织结构,元素组成和相组成进行了测试和分析。结果表明:在浸渗过程中骨架中的Ti元素的溶解析出和与C元素的原位反应促进了浸渗过程的进行,在1 370℃保温1.5h,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。摩擦磨损试验表明,该材料具有优良的抗磨粒磨损性能,其耐磨性优于工业用耐磨铸铁。As a new kind of method to prepare composites, pressureless Ti-activated reactive melt infiltration was investigated in this paper： The Ti-Al2O3 porous ceramics skeleton pre- form was prepared by gelcasting using sugar as a pore former. Under vacuum condition, the Ti-Al2O3 porous ceramics skeleton preform was infiltrated at 1370℃ by Fe-Cr-C alloy melt with in-situ reaction to prepare the Fe-Al2O3-TiC composites. The microstructures, element composition and phase analysis were investigated by using SEM-EDX and X-ray diffraction. The results show that the infiltration process is accelerated by the dissolution and precipitati- on of titanium and the in-situ reaction between titanium and carbon. At 1370℃ for 1.5 h, the porous ceramics skeleton is infiltrated by the melt, and the space structure is not to be changed in the infiltration process. The results of wear tests show that, the Fe-Al2O3-TiC composites have excellent wear resistance, and the abrasive wear resistance of the ℃composites is better than that of the industrial wear resistant cast iron.

关 键 词：Fe-Al2O3-TiC复合材料 无压浸渗 原位反应 多孔材料 凝胶注模 

分 类 号：TB331[一般工业技术—材料科学与工程]