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Flash Sintering of Multiphase Ceramics

多相陶瓷的闪速烧结

基本信息

批准号：
1662791
负责人：
Martha Mecartney
金额：
$ 34.94万
依托单位：
University of California-Irvine
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-06-01 至 2021-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1662791&HistoricalAwards=false
关键词：
Flash Sintering Multiphase Ceramics

项目摘要

Traditionally, the process to make a components from ceramic powders or clays requires firing (sintering) in a furnace at high temperatures for a long time (many hours or days), a costly process that consumes a large amount of energy. A new process known as "flash sintering" involves running electrical current directly through the piece, to densify the ceramic and produce a usable component in a matter of seconds. Initial studies show that many types of ceramics can be fired this way, but these studies have focused on single phase materials, while practical applications often require multiple phases made of different types of ceramics. This award supports fundamental research to investigate how the electrical and thermal behavior of each component of a multi-phase ceramic responds to flash sintering. This work will lead to new understanding of the flash sintering process, which will allow for lower cost, higher efficiency processing and manufacture of these critical materials. The processing and the strength of these materials will be studied, to ensure that the components made by this new process are comparable to or better than those made by traditional methods. The scientific results of the project are integrated into video modules for outreach to elementary and middle school children, to demonstrate the ways that scientists and engineers are studying methods to save energy while making new materials. Multiple phases are often required for ceramic components in order to improve mechanical strength, enhance thermal conductivity, and increase thermal shock resistance. In contrast to conventional sintering approaches which expend significant energy heating the sample and furnace cavity, a high applied electric field with current flowing through the sample can be used to densify oxide ceramics in air and without applied pressure and at much lower temperatures. This research program will evaluate how the direct application of electric fields can be used to flash sinter multiphase ceramic powder compacts. Multicomponent oxide systems with phases of varying electrical/ionic and thermal conductivity are used to determine the role of these material properties in promoting flash sintering. This information is used to create compositional design parameters to optimize flash sintering via incorporation of minor phases. Mechanical properties of flash sintered multiphase ceramic composites are compared to conventional sintered materials to evaluate any differences, with microstructural characterization by electron microscopy.

传统上，从陶瓷粉末或粘土中制造组件的过程需要在高温炉中长时间（数小时或数天）烧制（烧结），这是一个消耗大量能源的昂贵过程。一种被称为“闪蒸烧结”的新工艺是将电流直接通过陶瓷，使陶瓷致密，并在几秒钟内生产出可用的部件。最初的研究表明，许多类型的陶瓷都可以用这种方法烧制，但这些研究都集中在单相材料上，而实际应用往往需要由不同类型的陶瓷制成的多相。该奖项支持基础研究，以调查多相陶瓷的每个组件的电学和热行为如何响应闪现烧结。这项工作将导致对闪速烧结工艺的新认识，这将使这些关键材料的加工和制造成本更低，效率更高。将研究这些材料的加工和强度，以确保这种新工艺制造的部件与传统方法制造的部件相当或更好。该项目的科学成果被整合到视频模块中，向中小学生展示科学家和工程师正在研究如何在制造新材料的同时节省能源。为了提高机械强度，增强导热性，增加抗热震性，陶瓷部件通常需要多相。传统的烧结方法需要消耗大量的能量来加热样品和炉腔，与之相反，一个高外加电场和流过样品的电流可以用来在空气中致密化氧化陶瓷，不需要施加压力，而且温度要低得多。本研究计划将评估如何直接应用电场用于闪蒸烧结多相陶瓷粉末压块。采用具有不同电/离子和热导率相的多组分氧化物体系来确定这些材料性质在促进闪速烧结中的作用。该信息用于创建成分设计参数，通过合并小相来优化闪速烧结。将闪蒸烧结多相陶瓷复合材料的力学性能与常规烧结材料进行了比较，并通过电子显微镜对其微观结构进行了表征。