Collaborative Research: Making Nanostructured Ceramics from Micrometer-Sized Starting Powders

合作研究：用微米级起始粉末制造纳米结构陶瓷

• 批准号: 0800018
• 负责人: Fuqian Yang
• 金额: $ 22.26万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-07-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0800018&HistoricalAwards=false
• 关键词: Collaborative; Research; Making; Nanostructured; Ceramics

Abstract The research objective of this award is to develop a field-activated processing technology for synthesizing bulk nanostructured ceramics (grain size 100 nm) from micrometer-sized starting powders. The effects of processing parameters, such as electric current density, heating rate, frequency of pulse, sintering temperature and holding time, on microstructural evolution and densification of materials will be experimentally investigated to achieve an understanding of the important processing parameters, which control the field-activated processing of nanostructured ceramics. Analytical models will be developed to study the effects of electrothermal-mechanical interactions on the field-activated consolidation of materials and on the formation of nanostructured materials. The theoretical results will be correlated to the experimental findings to obtain a fundamental understanding of the dominant mechanisms controlling the processing. Mechanical testing will be performed to characterize the mechanical behavior of the nanostructured materials and to establish the mechanical property-microstructural relationships of the resultant materials. If successful, the results of this research will lead to a fundamentally new processing technology for synthesizing bulk nanostructured ceramics and potentially to the development of functionally nanostructured materials through the field-activated processes. The primary goal of this work is to determine the key processing conditions that control the formation of nanostructures. The important processing conditions may include distribution of electric current through the consolidated material, input of electric energy into the material, and electrothermal-mechanical interactions. Understanding the fundamental mechanisms in controlling the field-activated processing will help to determine the optimal condition for achieving homogeneous bulk nanostructured ceramics and to improve the design methodology for industrial production of bulk nanostructured ceramics. The proposed work will also contribute to numerical modeling for nonlinear electrothermal-mechanical problems.

摘要该奖项的研究目标是开发一种场激活处理技术，用于从微米级起始粉末合成块体纳米结构陶瓷（晶粒尺寸100 nm）。工艺参数，如电流密度，加热速率，脉冲频率，烧结温度和保温时间，对材料的微观结构演变和致密化的影响将进行实验研究，以实现重要的工艺参数，控制场激活处理的纳米结构陶瓷的理解。将开发分析模型，以研究电热-机械相互作用对材料场激活固结和纳米结构材料形成的影响。理论结果将与实验结果相关联，以获得对控制加工的主导机制的基本理解。将进行机械测试以表征纳米结构材料的机械行为，并建立所得材料的机械性能-微观结构关系。如果成功的话，这项研究的结果将导致一个从根本上新的加工技术，用于合成块体纳米结构陶瓷和潜在的功能纳米结构材料的开发，通过现场激活过程。这项工作的主要目标是确定控制纳米结构形成的关键工艺条件。重要的加工条件可以包括通过固结材料的电流分布、电能输入到材料中以及电热-机械相互作用。了解控制场激活处理的基本机制将有助于确定获得均匀块体纳米结构陶瓷的最佳条件，并改善块体纳米结构陶瓷工业生产的设计方法。所提出的工作也将有助于非线性电热力学问题的数值建模。