On reactive suspension plasma spraying of calcium titanate

Significance Statement

Research team from Institute of Plasma Physics of the Czech Academy of Sciences developed procedure for formation of calcium titanate (CaTiO3) coatings or powders based on reactive suspension plasma spraying of mixture of powders CaCO3 and TiO2 dispersed in ethanol. Calcium titanate is widely used dielectric ceramics in electronic applications. Suspension plasma spraying procedure is promising for further technological use in coatings applications because for formation of dielectric CaTiO3 is not necessary to use calcium titanate but use of easily available precursors CaCO3 and TiO2 will satisfy.

Figure Legend: Shadowgraphy of suspension penetration into plasma jet (left), suspension feeding into plasma jet (right).

On reactive suspension plasma spraying of calcium titanate. Advances in Engineering

About the author

Jiří Kotlan studied at Faculty of Electrical Engineering at the Czech Technical University in Prague where he received hid BSc in 2010 and his MSc in 2012. He is currently pursuing his PhD at the same faculty but supervised at the Department of Materials Engineering of the Institute of Plasma Physics of the Czech Academy of Sciences. His current research focuses on the role of deposition conditions, coatings microstructure and chemical composition on electrical properties of thermally sprayed ceramics from conventional powders as well as suspensions. Suspension plasma spraying brings a new opportunity in preparation coatings with fine microstructure and interesting materials properties. This topic is receiving considerable attention in the Institute of Plasma Physics of CAS. 

Journal Reference

Ceramics InternationalVolume 42, Issue 3, 15 February 2016, Pages 4607–4615.

Jiri Kotlan1,2, Zdenek Pala1,Radek Musalek1,Pavel Ctibor1

Show Affiliations
  1. Materials Engineering Department, Institute of Plasma Physics CAS, v. v. i., Za Slovankou 3, 182 00 Prague 8, Czech Republic
  2. Department of Electrotechnology, Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, 166 27 Prague 6, Czech Republic

Abstract

This study shows possibility of preparation of calcium titanate powder and coatings by reactive suspension plasma spraying. Suspension of mixture of calcium carbonate (CaCO3) and titanium dioxide (TiO2) powders in ethanol was fed into hybrid plasma torch with a DC-arc stabilized by a water–argon mixture (WSP®-H 500). Various feeding distances and angles were used in order to optimize suspension feeding conditions. In the next step, the coatings were deposited on stainless steel substrates and the effect of substrate temperature on microstructure and chemical and phase composition of the coatings was studied. Captured in-flight particles and deposits were analysed by X-ray diffraction (XRD) and scanning electron microscopy SEM equipped with EDX detector. Obtained results confirm that chemical reaction of CaCO3 and TiO2 forming CaTiOperovskite takes place during the interaction of suspension with plasma jet. The conditions of rapid cooling during spraying process result in the presence of metastable CaTiO3 high-temperature tetragonal and cubic phases. Increase in the substrate temperature increases the content of the calcium titanate in the deposit and the coatings microstructure becomes more compact. Obtained results show that WSP®-H technology may be used for deposition of the CaTiO3 powders and coatings by reactive plasma spraying.

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