US-Turkey Cooperative Research: Characterization and Processing of Oxide Powders and Compacts

0322622 CarterDescription：该项目支持明尼苏达州明尼阿波利斯明尼苏达大学(UM)化学工程与材料科学系Barry Carter博士与土耳其伊斯坦布尔Sabanci大学工程与自然科学系Mehmet Ali Gulgan博士之间的合作研究。他们计划研究氧化物粉末和压坯的表征和加工。该项目强调了两种重要的陶瓷氧化物，即氧化铈和氧化铝，两名研究人员已经在独立研究这两种氧化物。多晶α-Al_2O_3是一种重要的工业陶瓷材料。例如，它的强度、韧性、耐腐蚀性和耐磨性以及蠕变性能与其微观结构和界面化学密切相关。关于各种杂质对陶瓷的性能和微观结构的影响，文献中已经收集了大量的知识。分析电子显微镜研究，特别是使用能量损失光谱，将有助于研究高掺杂氧化铝陶瓷中第二相(如Ca6)的初始形成。这家美国集团之所以对CeO2感兴趣，主要是因为它在化学/机械抛光(CMP)中发挥了关键作用。土耳其的该集团在处理用于燃料电池的相同材料方面拥有经验。这次合作将利用这两个项目的协同效应。通过与橡树岭国家实验室(ORNL)的合作，这家美国集团已经使用鳗鱼来探索CeO2的化学。这一方法将适用于在土耳其使用与氧化铝样品加工方法类似的方法进行掺杂和加工的多晶CeO2样品。美国团队将提供CeO2原料，并与ORNL和3M公司合作，准备和表征粉末；土耳其团队将提供以受控方式加工这种材料的专业知识。项目范围：美国的一个团队一直致力于粉末及其烧结产品的结构和化学分析，土耳其的一个团队正在制定高纯度粉末的制备和加工计划，该项目将汇集在一起。这两个群体都将本科生和女性纳入了他们的研究项目。美国小组与其他实验室(如ORNL)进行了广泛的互动，从而使学生和其他实验室都受益。卡特教授和古尔冈教授都在氧化铝系统的界面和中间相表征方面做了大量的工作。这项合作将涉及交换三名研究生，其中两名来自明尼苏达大学，一名来自萨班奇大学。

0322622 CarterDescription: This project supports a cooperative research between Dr. Barry Carter, Department of Chemical Engineering and Materials Science at the University of Minnesota (UM), Minneapolis, Minnesota and Dr. Mehmet Ali Gulgun, Department of Engineering and Natural Sciences, Sabanci University, Istanbul, Turkey. They plan to study the characterization and processing of oxide powders and compacts. The project emphasizes two important ceramic oxides, namely ceria and alumina, with which the two investigators are already independently working. Polycrystalline a-Al2O3 is one of the most important ceramics for industrial applications. Its strength, toughness, corrosion and wear resistance, and creep properties, for example, are closely related to its microstructure and interfacial chemistry. Extensive knowledge has been gathered in the literature about the influence of various impurities on the properties and microstructure of the ceramic. Analytical electron microscopy investigations, especially using energy-lossspectroscopy, will allow the study of the incipient formation of second phases, e.g. CA6, in highly doped alumina ceramics. The U.S. group's interest in ceria is due primarily to its critical role in chemical/mechanical polishing (CMP). The group in Turkey has experience in processing the same material for use in fuel cells. The collaboration will exploit the synergy of these two programs. Through collaboration with Oak Ridge National Laboratory (ORNL), the U.S. group has used EELS to probe the chemistry of ceria. This methodology will be applied to polycrystalline ceria samples, which have been doped and processed in Turkey using methods similar to those used to process alumina specimens. The U.S. team will provide the ceria material and, working with ORNL and the 3M Company, prepare and characterize the powders; the Turkish team will provide the expertise to process this material in a controlled manner. Scope: This project brings together a group in the USA which has been extensively working on the structural and chemical analysis of powders and their sintered products and a group in Turkey which is developing a program on the preparation and processing of high-purity powders. Both groups are including undergraduates and women in their research programs. The U.S. group has extensive interaction with other laboratories, e.g., ORNL, thus benefiting both the students and the other labs. Both Professors Carter and Gulgun have worked extensively on characterization of interfaces and interphases in alumina systems. The collaboration will involve the exchange of three graduate students, two from U. of Minnesota and one from Sabanci University.