钛铁矿原位合成金属陶瓷复合材料的研究  

Study on Cermet Composite by In- Situ Synthesis from Ilmenite

作　　者：吴一[1] 尹传强[2] 邹正光[2] 周浪[1] 李晓敏[2] 

机构地区：[1]南昌大学材料科学与工程学院,南昌330047 [2]教育部有色金属材料及其加工新技术重点实验室,桂林541004

出　　处：《硅酸盐通报》2005年第3期21-24,共4页Bulletin of the Chinese Ceramic Society

基　　金：广西自然科学基金(桂科自0007021);广西教育厅重点基金(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：钛铁矿资源储量丰富,充分利用钛铁矿中的钛和铁来制备金属陶瓷复合材料是天然钛铁矿综合开发利用中的一个重要方面。通过原位铝热、碳热还原法,以天然钛铁矿为主要原料,合成制备出了TiC-Al2O3/Fe陶瓷复合材料。研究了产物的物相、结构和性能,分析了铝热、碳热的反应过程。实验表明:反应产物主要为TiC相、Al2O3相和Fe相,还有少量Fe-Al相。大部分晶体颗粒尺寸约为3～5μm,分布较为均匀。金属添加剂改善了Fe对陶瓷相的润湿性,同时抑制了Al2O3和TiC间的高温化学反应,减少了气体的放出,界面结合得到了改善,促进了陶瓷材料的烧结致密。The cermet composite was produced using iron and titanium elemen t of abundant rare ilmenite adequately. It is an important aspect in exploitation and ultilization of the rare ilmenite. In this paper, the TiC- Al2O3/Fe composi te was produced by in- situ carbothermic and aluminothermic reduction from ilme nite as the main raw materials. Synthesis and sintering were accomplished unifie dly in vacuum resistance furnace. The composition,microstructure and properties of the products were studied. The process of the carbothermic and aluminothermic reduction were also analyzed. The result shows that the composite consists of T iC phase,Al2O3 phase,Fe- binder and a few of Fe- Al phase. The average grain s ize is about 3～ 5μ m. Adding metal- additives can improve the interfacial bon ding between Fe and the ceramic phase. It can inhibit the high temperature chemi cal reaction between Al2O3 and TiC, and increase the sinterability of composite ceramics.

关 键 词：金属陶瓷复合材料 钛铁矿原位 合成方法 放热反应 显微组织 力学性能 

分 类 号：TQ174.7[化学工程—陶瓷工业] TB332[化学工程—硅酸盐工业]