Microwave processing, characterizationand modeling of metal powder compacts

金属粉末压块的微波加工、表征和建模

• 批准号: 166159772
• 负责人: Professor Dr. Manfred Thumm
• 金额: --
• 依托单位: Department of Electrical Engineering
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/166159772?language=en
• 关键词: Microwave; processing; characterizationand; modeling; metal

The main goal of this project is to carry out a systematic study and the detailed experimental investigations on sintering behaviors of metal powders commonly used for the production of improve machine components. The systematic approach to study different aspects of the microwave sintering phenomenon would be achieved by dividing the overall field into three parts, namely, the modeling, the characterization and the processing. First of all, a number of samples made of commonly used metal powder compacts with different green densities will be prepared by uni-axial pressing. The modeling would involve the realization of these powder compacts as specialized composites, and computing the effective dielectric and magnetic properties of these samples in terms of the volume ratio and the material properties of each constituent. For the characterization, the scattering coefficients of each sample will be measured in order to determine the effective electromagnetic properties of these samples, which would then be compared with their theoretical values. On the processing front, the sintering of most of the samples would be performed in a gyrotron based high power microwave system. It is planned to carry out online measurements of temperature distribution and the DC conductivity during the sintering process of these samples by varying their composition and the green density, and comparing the results with the conventional methods. These investigations will be analyzed in detail with the help of SEM, EDX and the optical microscopy in order to fully understand the observed effects.

本项目的主要目标是对用于生产改进机械部件的金属粉末的烧结行为进行系统的研究和详细的实验调查。通过将整个领域分为三个部分，即建模，表征和处理，可以实现系统的方法来研究微波烧结现象的不同方面。首先，将通过单轴压制制备一些由具有不同绿色密度的常用金属粉末压坯制成的样品。建模将涉及实现这些粉末压块作为专门的复合材料，并计算这些样品的有效介电和磁性能的体积比和每种成分的材料特性。为了进行表征，将测量每个样品的散射系数，以确定这些样品的有效电磁特性，然后将其与理论值进行比较。在加工方面，大多数样品的烧结将在基于回旋管的高功率微波系统中进行。计划通过改变这些样品的成分和绿色密度，在线测量烧结过程中的温度分布和直流电导率，并将结果与常规方法进行比较。这些研究将在SEM，EDX和光学显微镜的帮助下进行详细分析，以充分了解观察到的效果。