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

Jinbu Su, Wancheng Zhou, Yi Liu, Yuchang Qing, Fa Luo, Dongmei Zhu

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

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 −23.90 dB at 10.13 GHz and reflection loss less than −9 dB over the whole investigated frequency.

Original languageEnglish
Pages (from-to)826-835
Number of pages10
JournalJournal of Thermal Spray Technology
Volume24
Issue number5
DOIs
StatePublished - 28 Jun 2015

Keywords

  • carbon black/cordierite coating
  • dielectric property
  • plasma spraying
  • reflection loss

Fingerprint

Dive into the research topics of 'Effect of Carbon Black on Dielectric and Microwave Absorption Properties of Carbon Black/Cordierite Plasma-Sprayed Coatings'. Together they form a unique fingerprint.

Cite this