Effect of Carbon Black on Dielectric and Microwave Absorption Properties of Carbon Black/Cordierite Plasma-Sprayed Coatings

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• 作者：Jinbu Su ; Wancheng Zhou ; Yi Liu ; Yuchang Qing…
• 关键词：carbon black/cordierite coating ; dielectric property ; plasma spraying ; reflection loss
• 刊名：Journal of Thermal Spray Technology
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：24
• 期：5
• 页码：826-835
• 全文大小：2,536 KB
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• 作者单位：Jinbu Su (1)
  Wancheng Zhou (1)
  Yi Liu (1)
  Yuchang Qing (1)
  Fa Luo (1)
  Dongmei Zhu (1)
  
  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Surfaces and Interfaces and Thin Films
  Tribology, Corrosion and Coatings
  Materials Science
  Characterization and Evaluation Materials
  Operating Procedures and Materials Treatment
  Analytical Chemistry
  
• 出版者：Springer Boston
• ISSN：1544-1016

文摘

Carbon black (CB)/cordierite composite coatings with different CB contents were fabricated by a multi-function micro-plasma spraying system developed by the Second Artillery Engineering College. Scanning electron microscopy was employed to investigate the microstructure of the spray-dried powders and as-sprayed coatings. The complex permittivities of the coatings and powders with different CB contents were investigated at the frequency of 8.2-12.4?GHz. The results show that both real and imaginary part of the permittivity increase with increasing CB content, which can be ascribed to the increase of the number of micro-capacitors and the polarization centers. Reflection loss of the as-sprayed coatings with different CB contents and thicknesses was calculated according to the transmission line theory. The coating with 4.54% CB content and 3.0?mm thickness shows optical microwave absorption with a minimum reflection loss of ?3.90?dB at 10.13?GHz and reflection loss less than ??dB over the whole investigated frequency.