钛铁矿原位碳热还原合成TiC/Fe的热力学过程及合成条件研究  

Thermodynamics Process and Synthesis Conditions Research on TiC/Fe Composite by In-Situ Carbothermic Reduction Method

作　　者：邹正光[1] 陈寒元[1] 麦立强[1] 

机构地区：[1]桂林工学院材料工程系,桂林541004

出　　处：《无机材料学报》2001年第5期903-908,共6页Journal of Inorganic Materials

基　　金：广西自然科学基金(桂科自0007021);国家自然科学基金(50062001);武汉工业大学材料复合新技术国家重点实验室开放基

摘　　要：以天然矿物钛铁矿（ＦｅＴｉＯ３）、Ｃ（石墨）为原料，采用原位碳热还原法，实现合成与烧结一体化，真空烧结制备了ＴｉＣ／Ｆｅ复合材料，探索了一条低成本合成高性能ＴｉＣ／Ｆｅ复合材料的新途径．对反应的热力学过程进行理论分析和实验研究，探讨了产物的合成条件．研究表明，ＴｉＣ的反应形成机理是：首先，ＦｅＴｉＯ３被Ｃ还原生成ＴｉｘＯｙ和α－Ｆｅ；然后，Ｃ继续与ＴｉｘＯｙ反应，将氧一步一步还原出来，直至生成ＴｉＣ；ＴｉＣ颗粒长大的过程是，先形成富Ｔｉ缺Ｃ的ＴｉＣｘ，然后ＴｉＣｘ继续与Ｃ反应形成接近化学计量比的ＴｉＣ．烧结温度范围在１５００～１６００℃之间，随温度的升高，产物的硬度和密度稍有提高．Ｍｏ的加入可以改善金属相对ＴｉＣ的润湿性．产物中有少量游离碳存在．TiC/Fe Composite was produced by In-Situ Carbothermic Reduction and Synthesis methods. Ilmenite, a natural mineral was used as the main raw material. Synthesis and sintering were accomplished unifiedly in vacuum resistance furnace. The main purpose of the study was to explore a new method to synthesize the advanced TiC/Fe composites with relatively lower cost. The whole thermodynamics process was analyzed and investigated not only in theory but also through experiments. The synthesis conditions of the product were also discussed. The study shows that the reaction formation principles of TiC are as following: firstly, FeTiO3 is reduced by carbon and it forms into Ti,,Oy and Fe; secondly, TixOy continuously reacts with carbon, and oxygen can be reduced out step by step, until the formation of TiC; the growth process of TiC-firstly TiCx with enough Ti and short C can be formed, then TiCx and C formed into TiC which is approximate the chemical meter mount proportion. The sintering temperature zone is between 1500 similar to 1600 degreesC, with the increase of temperature, the hardness and the relative density are also enhanced. Adding Mo can improve the interfacial bonding between the metal and TiC. Some residual carbon exists in the reaction product.

关 键 词：TIC/FE复合材料 原位合成 钛铁矿 热力学过程 合成条件 碳化钛 铁 陶瓷 金属 

分 类 号：TB333[一般工业技术—材料科学与工程]