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

0322622卡特描述：该项目支持明尼苏达大学（UM）化学工程和材料科学系巴里卡特博士与土耳其伊斯坦布尔萨班奇大学工程和自然科学系Mehmet Ali Gulgun博士之间的合作研究。 他们计划研究氧化物粉末和压块的特性和加工。 该项目强调了两种重要的陶瓷氧化物，即二氧化铈和氧化铝，这两位研究人员已经在独立工作。 多晶α-Al_2 O_3是重要的工业陶瓷材料之一。 例如，其强度、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。 在文献中已经收集了关于各种杂质对陶瓷的性质和微观结构的影响的广泛知识。 分析电子显微镜的调查，特别是使用能量损失光谱，将允许研究的初期形成的第二相，如CA 6，在高掺杂的氧化铝陶瓷。 该美国集团对二氧化铈的兴趣主要是由于其在化学/机械抛光（CMP）中的关键作用。 土耳其的这个小组在处理用于燃料电池的相同材料方面有经验。合作将利用这两个项目的协同作用。通过与橡树岭国家实验室（ORNL）的合作，美国研究小组已经使用EELS来探测二氧化铈的化学性质。 这种方法将适用于多晶氧化铈样品，这已被掺杂和加工在土耳其使用的方法类似于那些用来处理氧化铝标本。美国团队将提供二氧化铈材料，并与ORNL和3 M公司合作，制备和表征粉末;土耳其团队将提供专业知识，以受控的方式处理这种材料。适用范围： 该项目汇集了美国的一个小组，该小组一直在广泛研究粉末及其烧结产品的结构和化学分析，以及土耳其的一个小组，该小组正在开发高纯度粉末的制备和加工方案。 这两个小组都包括本科生和妇女在他们的研究计划。该美国小组与其他实验室进行了广泛的互动，例如，ORNL，从而使学生和其他实验室受益。 卡特教授和Gulgun教授都在氧化铝系统中的界面和界面相的表征方面进行了广泛的研究。这项合作将包括交换三名研究生，其中两名来自美国。一个来自明尼苏达州，一个来自萨班奇大学。

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.