Structure and properties of plasma sprayed BaTiO3 coatings

Abstract

Plasma spraying enables to create layers with thickness in a millimeter range adhering on various substrates. This paper provides a study of electric and mechanical properties of BaTiO 3 coatings prepared by atmospheric plasma spraying. The spraying was carried out by a direct current gas-stabilized plasma gun. BaTiO 3 was fed into the plasma jet as a feedstock powder prepared by a reactive sintering of micrometer-sized powders of BaCO 3 and TiO 2 . Microstructure and phase composition are reported and discussed in connection with electric and mechanical properties. The ability of the used techniques to detect precisely the phase transformation temperatures of BaTiO 3 plasma sprayed coatings is discussed as well. A depth-sensing indentation measurement was done between 290 and 520 K to provide local mechanical characterization. The elastic modulus has shown slightly higher values than that reported typically in papers focused on BaTiO 3 ferroelectric thin films. The average Vickers microhardness is tested to characterize the samples in larger scale. A wear resistance in a slurry environment is reported as well. Dielectric properties are reported for the temperature window of existence of the tetragonal ferroelectric phase. Relative permittivity and loss factor are studied at frequency from 50 Hz to 1 MHz and temperature from 260 to 400 K. #

Microstructure and Properties of Plasma Sprayed Lead Zirconate Titanate (PZT) Ceramics

“…The porosity parameters are compared with those of a BaTiO 3 coating produced by atmospheric plasma spraying using a gas-stabilized plasma gun [10]. The porosity as well as its standard deviation is higher in the case of PZT whereas the mean pore size (expressed as "equivalent diameter") is comparable.…”

Effect of Critical Plasma Spray Parameters on Microstructure and Microwave Absorption Property of Ti3SiC2/Cordierite Coatings

“…Because of high temperature achieved within plasma jets, any materials can be melted, decomposed, or vaporized, including refractory metals and ceramics. Recently, atmospheric plasma spraying (APS) has been developed in many applications in order to improve resistance to wear, corrosion, oxidization, erosion, and heat (Ref [5][6][7][8].…”

High-temperature X-ray diffraction analysis and reactive sintering of BaTiO₃ piezoelectric ceramics

“…3)5) Various methods, such as solgel, 6) hydrothermal precipitation, 7) co-precipitation, 8) mechanochemical synthesis 9) and plasma spray coating, 10) have been investigated for the processing of BaTiO 3 powders and bulk ceramics. To utilize BaTiO 3 as a piezoelectric material, cation doping 11) and two-step sintering 12) are attractive techniques to improve the piezoelectric properties.…”