Journal of Advanced Materials and Technologies

Journal of Advanced Materials and Technologies

Effect of plasma spray parameters on the microstructure anddielectric properties of barium titanate coating

Authors
Amir hossein Pakseresht 1
Mohamadreza Rahimipour 1
M.R. Vaezi 2
Mehdi Salehi 2
1 Department of Ceramics, Materials and Energy Research Center
2 Department of Materials Engineering, Isfahan University of Technology, Isfahan
10.30501/jamt.2635.70257
Abstract
In this research, Barium titanate thick film was produced by thermal spray method on stainless steel
substrate. Morphology and structure properties of BaTiO3 coatings prepared by atmospheric plasma spraying were
evaluated using scanning electron microscope (SEM) and X-Ray diffraction (XRD) techniques, respectively. According
to the results, parameter optimization has been shown to play a critical role in the deposition of these materials as thin
structurally homogeneous deposits. Based on XRD results, the sprayed films were predominantly polycrystalline but
contained an amorphous second phase. The crystalline/amorphous ratio is directly related to the dielectric properties of
the layer, with greater crystallinity giving higher values of dielectric constant. Microcracks and splat/splat interfaces are
also believed to adversely affect the dielectric properties. The maximum dielectric constant (k) values achieved using
the APS method for deposition is in the range of 70–115. Dielectric constant values changed to 160-180 after heat
treatment. 
Keywords
Dielectric Constant
Amorphous Phases
BaTiO3
Plasma spraying
Splat
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  • Receive Date 04 May 2014
  • Revise Date 25 May 2014
  • Accept Date 31 May 2014