高纯、细粒度钛粉超声熔盐电解可控制备基础研究

项目名称： 高纯、细粒度钛粉超声熔盐电解可控制备基础研究

项目编号： No.51474245

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 袁铁锤

作者单位： 中南大学

项目金额： 80万元

中文摘要： 近年来，W-Ti靶材、激光3D打印、高性能粉末冶金等领域的迅速发展对钛粉提出了较高要求：纯度4N、氧含量≤1000ppm、细粒度-500目。然而传统钛粉制备方法难以满足，成为长期困扰以上高新领域发展的重要难题。本项目在前期已初步获得熔盐电解制取钛粉（纯度3N、氧含量1500ppm，粒度-300目）经验基础上，从粒度细化时纯度降低这一难点出发，提出以超声辅助的熔盐电解为制备方法，以可溶性海绵钛阳极为原料，以NaCl-KCl-TiClx为电解质，开展以下研究：首先，基于能斯特理论及实验研究，获得钛纯度-电极电位-电解工艺定量规律；其次，揭示超声熔盐电解微观机制，建立形核率与生长速率的动力学表征；而后，通过以上模型结合实验测试，明确钛粉粒度-形核率与长大速率-电解工艺的定量关系；最后，综合以上电解工艺对纯度、粒度与形貌影响的定量规律，获得纯度、粒度兼顾的高纯钛粉可控制备理论与技术。

中文关键词： 粉末冶金；高纯钛；熔盐电解；纯度；粒度

英文摘要： The rapid development in industries such as W-Ti target manufacturing, laser 3D printing and high performance powder metallurgy in recent years presents a high demand on raw material titanium powder. It asks for the high purity(4N level) with low oxygen concentration(≤1000ppm), as well as fine grain size(-500 mesh).However, the fact that traditional manufacturing techniques can hardly meet these requirements has become a major concern encumbering the future prospect of those high-tech fields. Based on the earlier-stage work of producing titanium powder (3N purity, ≤1000ppm oxygen concentration, -300 mesh) by molten salt electrolysis method, and focusing on balancing the purity and granularity of the electrolyzed titanium powder,the present research proposes a technique of ultrasonic molten salt electrolysis, using solvable titanium sponge as anode and NaCl-KCl-TiClx as electrolyte, the following work will be conducted: firstly, to obtain the quantitative disciplines of titanium purity, electrode potential and electrolysis process parameters on account of Nernst theory; next, to reveal the micro-mechanism in molten salt electrolysis and establish kinetics model for nucleation and growth rate; then to verify the aforementioned quantitative disciplines by applying the kinetics model into experimental procedure; last but not least, integrating the quantitative disciplines for purity and grain size, to acquire controllable producing theory and technique of high purity titanium powder with ideal granularity.

英文关键词： powder metallurgy;high purity;molten salt electrolysis;purity;particle size