Development and characterization of new ceramics.

我们的研究小组和科廷理工大学的奥康纳教授的研究小组合作进行了新陶瓷的开发和表征研究。在澳大利亚为了进行合作实验和讨论，进行了8次互访。主要研究结果如下：利用原子力显微镜观察到含氧化钇部分稳定氧化锆陶瓷在等温时效过程中发生了从四斜晶到单斜晶的间歇相变，表明相变发生在晶界，并向晶界内部扩展，进而向相邻晶粒扩散。少量氧化铝的加入提高了材料的力学性能（K_），认为这是由于在晶界处形成了非晶层。<IC>从X射线衍射图和合作讨论的分析，主要的，在烧结，然后老化氧化锆试样形成的晶面不同于粉末氧化锆。科廷大学课题组研制了一种新型陶瓷材料Ti_3SiC_2，它具有独特的电学、热学和力学性能。姬路工业大学用高分辨电子显微镜对Ti_3SiC_2进行了织构分析和显微结构观察，并对Ti_3SiC_2的显微结构进行了研究。陶瓷材料的表层强度高，内部韧性好。

Collaborative research on development and characterization of new ceramics has been carried out by our group and the group of Prof. O'Connor in Curtin Univ. of Tech. in Australia. For collaborative experiments and discussion, mutual visits were held eight times. The main results of the research are as follows : On partially stabilized zirconia ceramics containing ytria, tetragonal to monoclinic phase transformation during isothermal aging was intermittently observed using an atomic force microscope, which showed that the transformation occurred at grain boundaries, and propagated to the gram interior, and the spread to the neighboring grains. Addition of small amount of alumina improved mechanical property (K_<IC>), which is believed to be due to amorphous layer formed at gram boundaries. From analyses of X-ray diffraction patterns and collaborative discussion, Predominant, crystal planes formed in sintered and then aged zirconia specimens differed from those formed in powder zirconia. New ceramic, Ti_3SiC_2, having unusual electrical, thermal and mechanical properties was prepared by me group in Curtin Univ. Texture analyses and microstructural observations using high resolution electron microscopes in Himeji Institute of Technology were carried out and the microstructures in Ti_3SiC_2 have process. The ceramics showed high strength in the surface layer and high toughness in the interior region.