Japan-JSPS Fellowship: Machining of Ceramics

0225024Patten该奖项为北卡罗来纳大学夏洛特分校的John A. Patten提供为期18个月的日本科学促进协会（JSPS）短期博士后奖学金。他将与日本东北大学的高伟教授合作。他们将从事陶瓷加工方面的研究。这将涉及到三种不同的氮化硅陶瓷。它们是来自Ceradyne的反应键合氮化硅，来自日本的热等静压（HIP）材料和来自Allied Signal的商用HIP材料。这三种材料在加工时表现相似，因为它们具有延性到脆性的转变（随着切削深度的增加或进料的增加），但在加工特性方面表现不同。他们将研究作用力、刀具磨损、切削刃半径测量、成品表面粗糙度，然后使用TEM和拉曼光谱评估去除的材料（切屑）和成品表面的相变迹象。研究人员希望确定这三种材料的行为差异，然后开发出利用它们差异的方法。陶瓷的延性加工是有利的，因为它可以产生非常光滑、无裂纹的表面。这种表面对许多结构和微电子应用都很有用。这个项目将为两国共同努力提供一个很好的机会。通过思想和技术的交流，该项目将扩大我们的基础知识基础，促进国际了解与合作。研究人员计划在网上公布研究结果，并在科学会议上报告研究结果。

0225024PattenThis award supports an eighteen month Japan Society for the Promotion of Science (JSPS) Short-Term Postdoctoral Fellowship for John A. Patten at the University of North Carolina in Charlotte. He will be collaborating with Professor Wei Gao at Tohoku University in Japan. They will be undertaking research on the machining of ceramics. This will involve working on three different silicon nitride ceramics. They are a reaction bonded silicon nitride from Ceradyne, a hot isostatic press (HIP) material from Japan and a commercial HIP material from Allied Signal. All three materials behave similarly when machined, in that they have a ductile to brittle transition (with increasing depth of cut or increasing feed) yet all behave differently in terms of their machining characteristics. They will be studying the forces, tool wear, cutting edge radius measurements, finished surface roughness and then evaluating the material removed (chips) and the finished surface for signs of phase transformations using TEM and Raman Spectroscopy.The researchers hope to determine the behavior differences for these three materials and then develop methods to exploit their differences. Ductile machining of ceramics is advantageous in that very smooth, crack free surfaces can be generated. Such surfaces are useful for many structural and also microelectronic applications. This project will offer a good opportunity to join efforts between the two countries. Through the exchange of ideas and technology, this project will broaden our base of basic knowledge and promote international understanding and cooperation. The researchers plan to publish results of the research on the web and report on the findings at scientific meetings.