Detonation spraying of TiO₂-2.5 vol. % Ag powders in a reducing atmosphere

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• 作者：Dina V. Dudina^a ; ^{dina1807@gmail.com} ; Sergey B. Zlobin^b ; Natalia V. Bulina^a ; Alexey L. Bychkov^a ; Vladimir N. Korolyuk^c ; Vladimir Yu. Ulianitsky^b ; Oleg I. Lomovsky^a
• 关键词：TiO2 ; Detonation spraying ; Electron microscopy ; Microstructure
• 刊名：Journal of the European Ceramic Society
• 出版年：2012
• 出版时间：April 2012
• 年：2012
• 卷：32
• 期：4
• 页码：815-821
• 全文大小：750 K

文摘

In the present work, rutile powders containing additions of metallic silver (2.5 vol. % ) were detonation sprayed in a reducing atmosphere formed by gaseous detonation products of the C₂H₂ + 1.05O₂ mixture. The initial volume of the C₂H₂ + 1.05O₂ mixture - explosive charge - used for a detonation pulse was computer-controlled as the fraction of the barrel volume filled with the mixture. Using a previously developed model of the detonation process, the particle temperatures and velocities were calculated to explain the observed phase and microstructure development in the coatings. With increasing explosive charge, the temperature of the sprayed particles increased and rutile was partially reduced to oxygen-deficient TiO_2?em>x and then to Ti₃O₅. When the melting temperature of rutile was not reached, the coatings were porous; semi-molten particles formed denser coatings obtained with higher spraying efficiency. Silver inclusions in the titanium oxide matrix experienced melting and substantial overheating, but remained well preserved in the coatings.