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Research Article | Open Access

Effects of annealing and firing in wet hydrogen on the dielectric breakdown strengths of alumina ceramics

Jishi DUa( ), Binghua TANGa, Wei LIUa, Tao ZHANGa,b, Jiagen PENGa, Hu CHENa, Yangjun LEIa
Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900, China
Department of Materials Science, Sichuan University, Chengdu 610064, China
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Abstract

Annealing and firing in wet hydrogen are widely used steps in the processing alumina–ceramic insulators that may affect their dielectric breakdown strengths (DBS). In this study, the effects of annealing (at 1300 ℃ for 7 h) and firing in wet hydrogen on the DBS of alumina ceramics (all sintered at 1650 ℃) were studied, and the underlying mechanisms were analyzed by material characterizations. Annealing reduced the DBS of the 95% alumina ceramics due to the inter-granular phase crystallization, and the reduction in the DBS could be correlated to the reduction in mechanical strength. In contrast, annealing improved the DBS of the 99% alumina ceramic without intergranular phase transformation. Firing in wet hydrogen at 1500 ℃ caused the DBS increment, which can be ascribed to the reduction in the concentrations of point defects and electrical carriers.

Keywords

alumina ceramicdielectric breakdown strength (DBS)inter-granular phase crystallizationfiring in wet hydrogen

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Journal of Advanced Ceramics
Volume 9 Issue 2,
April 2020
Pages 173-182
DOI: 10.1007/s40145-019-0357-x
Cite this article:
DU J, TANG B, LIU W, et al. Effects of annealing and firing in wet hydrogen on the dielectric breakdown strengths of alumina ceramics. Journal of Advanced Ceramics, 2020, 9(2): 173-182. https://doi.org/10.1007/s40145-019-0357-x

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Received: 15 November 2019
Revised: 24 December 2019
Accepted: 26 December 2019
Published: 07 April 2020
© The author(s) 2019

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