Acquisition/Development of Equipment for Processing and Characterization of Functionally Graded Materials

功能梯度材料加工和表征设备的采购/开发

• 批准号: 0315290
• 负责人: Eugene Olevsky
• 金额: $ 11.45万
• 依托单位: San Diego State University Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0315290&HistoricalAwards=false
• 关键词: Acquisition; Development; Equipment; Processing; Characterization

This grant supports the acquisition and development of equipment for sintering and in-sintering non-destructive characterization of functionally graded materials (FGM) at San Diego State University. The new instrumentation will augment modeling efforts in the area of the continuum theory of sintering. This theory is becoming the basis for macroscopic analysis of technological processes of sintering including both conventional powder thermo-processing and novel areas such as microwave sintering. The continuum approach enables the prediction of shape distortions and density distributions under sintering which are critical in modeling net-shape processing of powder materials. Thereby one of the most important problems of powder treatment - dimension control can be successfully resolved. In processing of FGM, sintering rates differ with position and uneven shrinkage may lead to defect formation and damage of a powder specimen. Without advances in the predictive modeling and experimentation, the cost of FGM may remain too high. The new instrumentation will enable the utilization and comparative assessment of two main approaches for the sintering of FGM: conventional sintering by external heating and microwave sintering. While conventional sintering by external heating is usually applied to already graded green specimens, in microwave sintering, porosity gradients appear due to a non-uniform temperature distribution within powder specimens. In sintering of FGM, shape distortions and damage are two most significant known problems. We will also develop a unique dilatometric-ultrasonic testing device. This device will incorporate both dilatometry and nondestructive ultrasonic characterization of powder materials during the sintering process. For this system, we will acquire a Confocal Fabry-Perot Interferometer. This is an innovative experimental technique that will enable a comprehensive integrated and comparative examination of both conventional and microwave sintering kinetics (including shrinkage and surface area reduction) and damage detection. Integration of modeling and experiments should provide the basis for on-line process control for a wide range of sintering operations. %%%Broader impacts of the project include the growing industrial importance of the functionally graded materials, which are used in joining of dissimilar materials, in micro-electronic devices, bioimplants, etc. Furthermore, the acquired and developed equipment will contribute to the research programs of multiple San Diego State University faculty members. Currently active research programs in powder processing and non-destructive materials evaluation will benefit. The new instrumentation will also contribute to the research program in the area of fabrication and in-processing characterization of magnetic materials. The development part of this project assumes considerable involvement of undergraduate students who will be able to explore new experimental capabilities in the framework of their senior design projects.

这笔拨款支持圣地亚哥州立大学的烧结和烧结中功能梯度材料（FGM）无损表征设备的购置和开发。新的仪器将增强烧结连续介质理论领域的建模工作。这一理论正在成为宏观分析烧结工艺过程的基础，包括传统的粉末热加工和微波烧结等新领域。连续介质方法可以预测烧结过程中的形状畸变和密度分布，这对粉末材料的净形状加工建模至关重要。从而成功地解决了粉末处理中最重要的问题之一——尺寸控制。在FGM的加工过程中，烧结速率随位置的不同而不同，不均匀的收缩可能导致粉末试样的缺陷形成和损伤。如果在预测建模和实验方面没有进展，女性生殖器切割的成本可能仍然太高。新的仪器将能够利用和比较评价两种主要的烧结FGM的方法：传统的外部加热烧结和微波烧结。传统的外部加热烧结通常应用于已经分级的绿色试样，而在微波烧结中，由于粉末试样内部温度分布不均匀，孔隙率梯度出现。在FGM烧结中，形状变形和损伤是已知的两个最重要的问题。我们还将开发一种独特的扩张超声检测设备。该装置将在烧结过程中对粉末材料进行膨胀测量和无损超声表征。对于这个系统，我们将获得一个共焦法布里-珀罗干涉仪。这是一项创新的实验技术，将使传统和微波烧结动力学（包括收缩和表面积减少）和损伤检测的综合和比较检查成为可能。建模和实验的结合将为广泛的烧结操作提供在线过程控制的基础。该项目的更广泛影响包括功能分级材料在工业上的重要性日益增加，这些材料用于连接不同材料，微电子设备，生物植入物等。此外，获得和开发的设备将有助于多个圣地亚哥州立大学教职员工的研究项目。目前在粉末加工和无损材料评价方面活跃的研究项目将受益。新仪器还将有助于磁性材料制造和加工表征领域的研究计划。这个项目的开发部分需要大量的本科生参与，他们将能够在他们的高级设计项目的框架中探索新的实验能力。