On reactive suspension plasma spraying of calcium titanate

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• 作者：Jiri Kotlan^a ; ^b ; ^{kotlan@ipp.cas.cz" class="auth_mail" title="E-mail the corresponding author} ; Zdenek Pala^a ; Radek Musalek^a ; Pavel Ctibor^a
• 关键词：A. Suspensions ; B. X-ray methods ; D. Perovskites ; E. Substrates ; Suspension plasma spraying
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 February 2016
• 年：2016
• 卷：42
• 期：3
• 页码：4607-4615
• 全文大小：4611 K

文摘

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 CaTiO₃ perovskite 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.