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

被引：44

作者：

Maniere, Charles ^{[1
]}

Zahrah, Tony ^{[2
]}

Olevsky, Eugene A. ^{[1
,3
]}

机构：

[1] San Diego State Univ, Powder Technol Lab, San Diego, CA 92182 USA

[2] Matsys Inc, Sterling, VA USA

[3] Univ Calif San Diego, NanoEngn, La Jolla, CA 92093 USA

来源：

SCRIPTA MATERIALIA | 2017年 / 128卷

关键词：

Microwave sintering; Heating; Instability; Permittivity; Effective medium approximation; Hot spot; ZIRCONIA; DENSIFICATION; CONDUCTIVITY; ALUMINA;

D O I：

10.1016/j.scriptamat.2016.10.008

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：49 / 52

页数：4

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