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.

宾夕法尼亚州立大学公园材料研究部的RUI奖提出了两个问题：首先，如何通过微波辐射如此有效地加热金属粉末粉状，其次，第二，如果烧结的初始阶段适合常规模型，或者解释需要微波特异性模型？齐默尔曼教授和宾夕法尼亚州立大学阿尔图纳州立大学的这两个问题将在三个方面解决：（a）对粉末金属紧凑型的复杂介电常数和渗透性的经验研究，这是使用谐振剂技术的温度，粒径，粒径，粒径，粒径，粒径，粒径，粒径，粒径，颗粒氧化和包装密度的功能； （b）使用单模微波系统鉴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检查（SEM或TEM）的检查，通过直接检查加热（烧结）样品来评估烧结的第一阶段。由于这些材料的工业意义，重点将放在铁和钴的铜，黄金和钨和铁磁粉末的过渡金属粉末上。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提高对微波烧结过程的了解。该项目将提供有关电磁特性以及微波加热和粉末状金属的烧结的新知识，这些知识可能在行业中具有广泛的应用。此外，该项目包括对学生的培训和发展，并使教师和博士后研究员的专业发展。这项工作正处于为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的本科生的研究环境中。大学学士学位科学，机电工程技术和材料科学科学的拟议学位课程的学位将从该本科研究计划中受益匪浅。学生将获得教育福利，同时为研究的成功做出重大贡献。他们的经验将在地区或国家会议上以口头和海报演示的结果传播结果。这些研究补充了大学公园宾夕法尼亚州立大学材料研究所，本科生将受益于与其他学生，博士后研究人员和大学公园宾夕法尼亚州立大学的教职员工的交流。