凝縮プラズマ系下の金属-超軽元素化合物生成機構の基礎的解明

在去年研究成果的基础上，逐步开展了两个小型实验研究项目。主要研究结果如下：1.凝聚等离子体反应新合成厚膜的高性能与微观表征。Al-Ti系合金在高温下易形成AlTi、Al_3Ti等化合物，但由于这些化合物晶体易于长大，难以将小尺寸的化合物颗粒分散到基体中以增强材料。本文利用冷凝等离子体与CH_4气体在1400℃高温下反应，在Al-Ti-C系中形成和分散了复杂碳化物。在等离子体反应之后形成厚的（μ omm）和高性能的（mHv_500）膜。通过XRD和EPMA分析，这种高性能的来源归因于一种新的复杂碳化物化合物的形成，包括TiC的超小颗粒尺寸.非平衡等离子体反应新合成厚膜的热力学和环境稳定性。研究了这种新合成的厚膜的热稳定性和环境稳定性。在等离子体反应条件下，通过在Al-C化合物中引入Ti原子，使其稳定性比未引入Ti原子的Al-C化合物有了很大的提高。这两种稳定性的提高也被认为是由于形成了包括TiC在内的具有超小颗粒尺寸的新的复杂化合物，并指出了这种新合成的厚膜在工业上应用的未来趋势。(1)（2）建立这种高性能材料在超小颗粒铝基体中完全均匀分散的方法，在这两个剩余点上，继续进行理论和实验研究。

Two small experimental research projects based on previous results in last year were conducted progressively. Obtained main results are as follows.1. High performance and micro characterization of newly synthesized thick film formed by condensed plasma reaction. Though the compounds such as AlTi and AI_3Ti are easy formed at high temperature in Al-Ti system, it is difficult to disperse small size of these compound particle into matrix for strengthening the materials due to easy growth of these compounds crystal. Formation and dispersion of complex carbide compounds in Al-Ti-C system has tried by means of condensed plasma reaction with CH_4 gas at high temperature up to 1400℃. Thick (^omm) and high performance (mHv^o500) film was formed after the plasma reaction. By using XRD and EPMA analysis,the origin of this high performance has attributed to a new formation of complex carbide compounds including TiC with ultra small size of particle.2. Thermodynamic and environmental stability of newly synthesized thick film in non-equilibrium plasma reaction. Thermal and environmental stability of this newly synthesized thick film has examined. By including of Ti atom into Al-C compound under plasma reaction with CH_4 gas, both stability have improved much more than those without Ti. These progress in both stability were also thought to be attributed to a new formation of complex compounds including TiC with ultra small size of particle.The future trends for applying this newly synthesized thick film to industrial use have pointed out follows. (1) Determination of crystal structure for this firm should be conducted by transmission electron microscope (2) Establishment of completely uniform dispersion method of this high performance materials into aluminum matrix with ultra small size of particle.On this two residual points, theoretical and experimental approach will be continued.