High temperature microwave absorbing properties of plasma sprayed La0.6Sr0.4FeO3-δ/MgAl2O4 composite ceramic coatings

Hongyao Jia, Wancheng Zhou, Hanyi Nan, Yuchang Qing, Fa Luo, Dongmei Zhu

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Microwave absorbing materials (MAM) which can be used in high temperature and oxidation environments are strongly demanded in application, for conventional MAM fail due to various factors at high temperature. In this work, ceramic coatings composed of La0.6Sr0.4FeO3-δ and MgAl2O4 have been successfully prepared via atmospheric plasma spraying and the microwave absorbing properties at high temperature are first reported. When the coatings of LSF/MAS matched with the metal substrate on thermal expansion, they can be treated repeatedly in the temperature range of 300 K–1173 K without peeling off. Meantime, the ceramic coatings with thickness of 1.5 mm showed considerable microwave absorption in the range of 8 GHz–18 GHz at high temperatures between 673 K–1173 K. The absorption bandwidth of LSF30 was 3.5 GHz for RL < −10 dB and 8 GHz for RL < −5 dB in the temperature range of 673 K–1173 K. LSF/MAS possesses the advantages of thin thickness and broad bandwidth at high temperatures, suggesting great potential as MAM in ultra-temperature environment.

Original languageEnglish
Pages (from-to)6168-6173
Number of pages6
JournalCeramics International
Volume46
Issue number5
DOIs
StatePublished - 1 Apr 2020

Keywords

  • Functional applications
  • Perovskites
  • Spinels
  • Thermal expansion

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