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.

材料研究部授予位于大学园区的宾夕法尼亚州立大学的RUI奖解决了两个问题：第一，金属粉末压坯是如何通过微波辐射如此高效地加热的；第二，烧结的初始阶段是否符合传统模型，或者解释是否需要微波专用模型？这两个问题将由齐默尔曼教授和宾夕法尼亚州立大学阿尔图纳分校的研究小组从三个方面进行：(A)使用谐振腔技术对粉末金属压坯的复介电常数和磁导率随温度、颗粒大小、颗粒氧化和堆积密度的函数进行实证研究；(B)使用单模微波系统确定电场和磁场对加热和烧结的不同贡献；(C)通过光学和扫描或透射电子显微镜(扫描电子显微镜或透射电子显微镜)对加热(烧结)样品进行直接检查，对烧结的第一阶段进行评估。由于这些材料的工业意义，重点将放在铜、金和钨的过渡金属粉末以及铁和钴的铁磁性粉末上。从这些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了解，该项目将为金属粉末的电磁性能和微波加热与烧结提供新的知识，在工业上具有广泛的应用前景。此外，该项目还包括对学生的培训和发展，并促进教师和博士后研究员的专业发展。这项工作是在本科生的研究环境下进行的，他们正在为应用科学和工程学的研究生学习或工业工作做准备。理科学士学位、机电工程技术学士学位和材料应用科学学位课程将从这个本科生研究项目中受益匪浅。学生将在为研究的成功做出重大贡献的同时，获得教育方面的好处。他们的经验最终将是在区域或国家会议上以口头和海报介绍的方式传播成果。这些研究补充了位于大学园区的宾夕法尼亚州立大学材料研究所的工作，本科生将受益于与位于大学园区的宾夕法尼亚州立大学的其他学生、博士后研究人员和教职员工交流想法。