Ti诱导无压反应熔渗制备Fe-TiC金属基复合材料的研究  

PROCESSING OF Fe-TiC METAL MATRIX COMPOSITES BY Ti-ACTIVATED IN-SITU REACTION INFILTRATION

作　　者：石永亮[1] 郭志猛[2] 李秀敏[1] 戚翠芬[1] 

机构地区：[1]河北工业职业技术学院材料工程系,050091 [2]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》2013年第5期35-41,共7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诱导无压反应熔渗制备金属基复合材料的方法:通过凝胶注模成形工艺,以蔗糖为造孔剂制备了孔隙率高达80%的多孔Ti-TiC陶瓷骨架预置体,真空状态下,在1380℃,分别以Fe-Cr-C和Fe-Cr-Ti-C两种合金熔体熔渗该多孔骨架预置体,制备了Fe-TiC金属基复合材料。并利用扫描电子显微镜、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:在熔渗过程中骨架中的Ti元素的溶解析出和与C元素的原位反应促进了熔渗过程的进行,随着熔渗保温时间的增加,基体中的增强相TiC分布趋于均匀化,并且TiC晶粒逐渐长大,1380℃保温3h时,晶粒长大到30μm;用Fe-Cr-Ti-C合金熔渗该多孔骨架1380℃保温1h即可制备出TiC晶粒细小、分布均匀的Fe-TiC金属基复合材料,并且该材料具有优异的抗磨粒磨损性能。As a new method to prepare Metal matrix composites （MMC）, pressureless Ti-ae- tivated reactive in-ltration was investigated in this paper. The Ti-TiC porous ceramics skele- ton preset body, which had 80% open porosity was prepared by gelcasting using sugar as pore former. Under vacuum condition, the Ti-TiC porous ceramics skeleton preset body was infiltrated in the melt Fe-Cr-C and Fe-Cr-Ti-C alloys to prepare the Fe-TiC MMC, respec- tively. The microstruetures, element composition and phase analysis were carried out by u- sing SEM and X-ray dif{raction. The results showed that the in-ltration process was acceler- ated by the dissolution and precipitation of titanium and the in-situ reaction between titanium and carbon. As the in-ltration time increased, the distribution of TiC tended to be homoge- neous, and the grains grew gradually. The TiC grains grew to 30 μm after holding time （3 h） at 1380℃ The Fe-TiC MMC, which demonstrated fine TiC grains, homogeneous mi crostructure and abrasive wear-resistance, was prepared by in-ltration using Fe-Cr-Ti-C alloy with holding time （1 h） at 1380℃

关 键 词：Fe—TiC复合材料 无压熔渗 原位反应 多孔材料 凝胶注模 

分 类 号：TB333[一般工业技术—材料科学与工程]