Promoting microstructural homogeneity during flash sintering of ceramics through thermal management
Promoting microstructural homogeneity during flash sintering of ceramics through thermal management
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DOI：
10.1557/s43577-020-00010-2
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发表时间：
2021-01-01
期刊：
影响因子：
5
通讯作者：
Dancer, Claire E. J.
中科院分区：
文献类型：
--
作者：
Jones, Gareth M.;Biesuz, Mattia;Dancer, Claire E. J.
闪速烧结（FS）是一种新颖的场辅助烧结技术，陶瓷通过焦耳效应在内部加热。虽然 FS 有望大幅减少陶瓷烧制时间和炉温，但迄今为止它仅在实验室规模上得到应用。将该技术扩大到工业制造水平的主要限制是管理热量产生和获得工业利益组件中的均匀微观结构的内在困难。异质区域主要源自 FS 期间形成的不同类型的热梯度；因此，热量产生的管理对于实现均匀性至关重要。在本文中，我们讨论了FS过程中控制陶瓷微观结构均匀性的优势，以及实现这一目标的技术路线。概述了闪速烧结时热梯度的起源和形成机制。确定了减少热梯度和微观结构梯度的可能方法。从工业和科学的角度讨论了FS放大的机遇和挑战。
Flash sintering (FS) is a novel field-assisted sintering technology, where the ceramic is heated internally by the Joule effect. While FS promises a tremendous reduction of ceramic firing time and furnace temperature, it has been applied only at the laboratory scale to date. The key limitation of scaling up the technique to the industrial manufacturing level is the intrinsic difficulty managing the heat generation and obtaining homogenous microstructures in components of industrial interest. Heterogeneous regions primarily originate from the different types of thermal gradients that develop during FS; therefore, the management of heat generation is crucial to achieve uniformity. In this article, we discuss the advantages of controlling the microstructural homogeneity of ceramics during FS, and the technical routes to achieve this. The origin and formation mechanisms of thermal gradients upon flash sintering are outlined. Possible approaches to reduce thermal and microstructural gradients are identified. The opportunities and challenges in scale-up of FS are discussed from both industrial and scientific perspectives.