Inherent heating instability of direct microwave sintering process: Sample analysis for porous 3Y-ZrO₂

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• 作者：Charles Maniè ; re^a ; Tony Zahrah^b ; Eugene A. Olevsky^a ; ^c ; ^{eolevsky@mail.sdsu.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Microwave sintering ; Heating ; Instability ; Permittivity ; Effective medium approximation ; Hot spot
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：128
• 期：Complete
• 页码：49-52
• 全文大小：666 K

文摘

Direct microwave heating of 3Y-ZrO₂ is studied at frequency of 2.45 GHz. Different conditions of input power, sample position and size are tested. For the first time, the experimentally known instability of microwave sintering is explained coupling the effective medium approximation and finite-element method. We show how the material dielectric permittivity imaginary part which increases with temperature and relative density encourages high hot spot phenomena. It is shown that the sample location has a great impact on the temperature distribution and decreasing the sample size promotes temperature homogenization thereby assisting the overall sintering stabilization.