Deposition of Al2O3-TiO2 Nanostructured Powders by Atmospheric Plasma Spraying

被引:1
作者
E. Sánchez
E. Bannier
V. Cantavella
M.D. Salvador
E. Klyatskina
J. Morgiel
J. Grzonka
A.R. Boccaccini
机构
[1] Universitat Jaume I.,Instituto de Tecnología Cerámica, Asociación de Investigación de las Industrias Cerámicas
[2] Universidad Politécnica de Valencia,Instituto de Tecnología de Materiales
[3] Institute of Metallurgy and Materials Science,Department of Materials
[4] Imperial College London,undefined
来源
Journal of Thermal Spray Technology | 2008年 / 17卷
关键词
Al; O; -TiO; nanostructured coatings; thermal spraying;
D O I
暂无
中图分类号
学科分类号
摘要
Al2O3-13%TiO2 coatings were deposited on stainless steel substrates from conventional and nanostructured powders using atmospheric plasma spraying (APS). A complete characterization of the feedstock confirmed its nanostructured nature. Coating microstructures and phase compositions were characterized using SEM, TEM, and XRD techniques. The microstructure comprised two clearly differentiated regions. One region, completely fused, consisted mainly of nanometer-sized grains of γ-Al2O3 with dissolved Ti+4. The other region, partly fused, retained the microstructure of the starting powder and was principally made up of submicrometer-sized grains of α-Al2O3, as confirmed by TEM. Coating microhardness as well as tribological behavior were determined. Vickers microhardness values of conventional coatings were in average slightly lower than the values for nanostructured coating. The wear resistance of conventional coatings was shown to be lower than that of nanostructured coatings as a consequence of Ti segregation. A correlation between the final properties, the coating microstructure, and the feedstock characteristics is given.
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