SHS结合热压制备TiC-Al_2O_3/Fe-Al复合材料  

Preparation of TiC-Al_ 2O_3/Fe-Al by SHS/HP

作　　者：王英辉[1] 李晓敏[1] 吴一[2] 邹正光[2] 

机构地区：[1]桂林工学院材料与化学工程系,广西桂林541004 [2]桂林工学院有色金属材料及其加工新技术省部共建教育部重点实验室,广西桂林541004

出　　处：《桂林工学院学报》2005年第2期187-190,共4页Journal of Guilin University of Technology

基　　金：广西自然科学基金资助项目(桂科自0007021);广西教育厅重点基金资助项目(桂教科研[2003]22);广西"新世纪十百千人才工程"基金资助项目(2002210)

摘　　要：以天然钛铁矿、铝粉和石墨为主要原料,采用自蔓延高温合成技术、铝热还原法并结合热压烧结技术,制备出TiC-Al2O3/Fe-Al复合材料.研究表明预热时间少于120s时,预热时间越长,反应燃烧波速度越大,当预热时间继续增大,对反应燃烧波速度的影响不再显著;加入添加剂Y2O3为0.2%时,金属相较均匀地弥散分布在陶瓷颗粒周围.晶粒尺寸约为2～3μm,复合材料的相对密度达到94%,抗弯强度和硬度分别为599.29MPa、83.7HRA.Ilmenite,a natural mineral, graphite and aluminum are used as the main materials to synthesize the TiC-Al_ 2 O_ 3 /Fe-Al composites by SHS.It is sintered by hot-pressure method.The study explores a new method of synthesizing TiC-Al_ 2 O_ 3 /Fe-Al composites with relative lower cost. The composites, microstructure and mechanical properties are studied in the paper.The effects of preheating time and additives on the composite are also explored. The result shows that when the preheating time is less than 120 s, the velocity of combustion wave will increase with the time.But when the preheating time is more than 120 s, the effect is not obvious.When 0.2%Y_ 2 O_ 3 as additive is added,the metal phases disperse equally around the ceramic particles, the grain size is about 2~3μm, the tensile strength of the composite is up to 599.29 MPa and the hardness is up to 83.7 HRA.

关 键 词：TiC—Al2O3/Fe—Al复合材料 SHS 钛铁矿 复合材料 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]