微波法原位合成V8C7-Cr3C2纳米复合粉末的热动力学及机理研究

项目名称： 微波法原位合成V8C7-Cr3C2纳米复合粉末的热动力学及机理研究

项目编号： No.51304063

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 矿业工程

项目作者： 赵志伟

作者单位： 河南工业大学

项目金额： 22万元

中文摘要： 纳米碳化钒/铬复合粉末兼有高硬度、高强度、高耐磨和抗氧化等优点，在高性能硬质合金和超硬材料领域具有重要应用价值。获得具有高纯度和良好分散性的纳米复合碳化物是实现其工业化应用、显著提升材料性能的关键问题。本课题拟结合热力学计算和动力学实验，系统研究纳米碳化钒/铬复合粉末的可控原位合成技术及其机理。首先采用经典法和Φ函数法两种热力学计算方法，研究微波合成的温度条件，定量化预测反应难易程度。然后采用不定温和化学反应法研究合成过程的动力学，全面揭示反应机制。最后通过研究介质损耗和介电常数变化特点及产物组成和结构变化规律等，探究原位合成纳米尺度复合碳化物的机理及产物性质的影响因素。研究结果将获得微波合成纳米复合碳化物的可控反应机理及影响产物纯度、分散性和微观结构等的关键因素。该课题关键问题的突破将为原位法制备纳米复合碳化物提供重要理论依据，并为高品质纳米复合碳化物的创新制备及应用提供关键技术支撑。

中文关键词： 纳米复合碳化物；原位合成；微波法；晶粒抑制剂；反应机制

英文摘要： Vanadium and chromium carbides nano-composite powders have the advantages of high stiffness, high strength, high abrasion resistance and oxidation resistance, which have important application values in high performance cemented carbides and superhard materials. To obtain nano-composite carbides with high purity and well dispersibility is the key problem to realize its industrial application and to significantly improve material performance. This project will combine the thermodynamics calculation and kinetics experiment, systematically study controllable in situ synthesis technology and its mechanism of vanadium and chromium carbides nano-composite powders. Firstly, two thermodynamics research methods of classical and Φ function methods will be adopted to research the temperature conditions of microwave synthesis and quantitatively forecast the reaction degrees. Secondly, kinetics analysis on the reaction process will be performed by using unconstant temperature and chemical reaction methods, and the reaction mechanism will be comprehensively revealed. Finally, in situ synthesized mechanism of nanoscale composite carbides and influence factors on products properties will be explored by studying the change rule of dielectric loss, dielectric constant, product composition and structure. The controllable reaction m

英文关键词： nano-composite carbides；in situ synthetic method；microwave method；grain growth inhibitor；reaction mechanism