RUI: Studies of the Heating and Sintering of Powdered Metals in Separate Electric and Magnetic Fields Using a Single Mode Microwave Cavity

RUI：使用单模微波腔在单独的电场和磁场中加热和烧结粉末金属的研究

• 批准号: 0406584
• 负责人: Darin Zimmerman
• 金额: $ 30万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-06-15 至 2008-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0406584&HistoricalAwards=false
• 关键词: RUI; Studies; Heating; Sintering; Powdered

This RUI award by the Division of Materials Research to Pennsylvania State University at University Park addresses two questions: first, how metal powder compacts are heated so efficiently by microwave radiation and, second, if the initial stage of sintering fits conventional models or does the explanation require a microwave-specific model? These two questions will be addressed by Professor Zimmerman and the team at Pennsylvania State University at Altoona on three fronts: (a) an empirical study of the complex permittivity and permeability of powder metal compacts as a function of temperature, particle size, particle oxidation, and packing density using resonant cavity techniques; (b) identification of the separate contributions of the electric and magnetic fields to the heating and sintering using a single-mode microwave system; and (c) evaluation of the first stage of sintering by direct examination of heated (sintered) samples by inspection with both optical and scanning or transmission electron microscopy (SEM or TEM). The focus will be on transition metal powders of copper, gold, and tungsten and ferromagnetic powders of iron and cobalt, due to the industrial significance of these materials. The knowledge of the temperature distribution and energy deposition gained from these present studies would advance understanding of the microwave sintering process.This project would provide new knowledge on the electromagnetic properties and microwave heating and sintering of powdered metals, which could have wide applications in industry. In addition, the project includes training and development of students and enables professional development of faculty and a postdoctoral researcher. This work is in a research environment for undergraduate students who are preparing for graduate studies or industrial work in the applied sciences and engineering. The universities B.S. degrees in Science, Electromechanical Engineering Technology and a proposed degree program in Applied Science of Materials will benefit greatly from this undergraduate research program. The students will reap educational benefits while making significant contributions to the success of the research. Their experience will culminate in the dissemination of results with oral and poster presentations at regional or national meetings. The studies complement work at the Materials Research Institute at Penn State University in University Park and the undergraduate students will benefit from an exchange of ideas with other students, post- doctoral researchers, and faculty at Penn State University in University Park.

该 RUI 奖项由宾夕法尼亚州立大学大学公园分校材料研究部颁发，解决了两个问题：第一，金属粉末压块如何通过微波辐射如此有效地加热；第二，烧结的初始阶段是否适合传统模型或解释需要微波炉专用型号吗？齐默尔曼教授和宾夕法尼亚州立大学阿尔图纳分校的团队将在三个方面解决这两个问题：（a）对粉末金属压块的复介电常数和磁导率作为温度、颗粒尺寸、颗粒氧化的函数的实证研究，和使用谐振腔技术的堆积密度； (b) 使用单模微波系统确定电场和磁场对加热和烧结的单独贡献； (c) 通过使用光学和扫描或透射电子显微镜（SEM 或 TEM）直接检查加热（烧结）样品来评估烧结的第一阶段。由于铜、金和钨的过渡金属粉末以及铁和钴的铁磁粉末，因为这些材料具有工业意义，因此重点将放在这些材料上。从这些目前的研究中获得的温度分布和能量沉积的知识将促进对微波烧结过程的理解。该项目将为粉末金属的电磁特性以及微波加热和烧结提供新的知识，这可能在工业中具有广泛的应用。此外，该项目还包括学生的培训和发展，并促进教师和博士后研究员的专业发展。这项工作是为准备攻读应用科学和工程领域的研究生或工业工作的本科生提供的研究环境。大学学士学位科学、机电工程技术学位和拟议的材料应用科学学位课程将从这个本科研究项目中受益匪浅。学生将获得教育收益，同时为研究的成功做出重大贡献。他们的经验最终将通过在区域或国家会议上进行口头和海报展示来传播成果。这些研究补充了宾夕法尼亚州立大学大学公园分校材料研究所的工作，本科生将受益于与宾夕法尼亚州立大学大学公园分校的其他学生、博士后研究人员和教师的思想交流。