Study of the microstructure of plasma sprayed coatings obtained from Al2O3-13TiO(2) nanostructured and conventional powders

作者：Goral A^*; Zorawski W; Litynska Dobrzynska L

来源：Materials Characterization, 2014, 96: 234-240.

DOI：10.1016/j.matchar.2014.08.016

• Al2O3-13TiO(2) coating
• Nanostructure
• Plasma spraying

The microstructure of coatings obtained from nanostructured or conventional Al2O3-13TiO(2) powders and deposited by plasma spraying technique on low-carbon steel was examined by transmission electron microscopy techniques. The dominating phase in both coatings was gamma-Al2O3 phase. It has been observed that the grains of gamma-Al2O3 grew in various shapes and sizes, that are particularly visible in the case of coating sprayed from nanostructured powder. The coatings obtained from the fully melted conventional powders exhibited a typical lamellar microstructure, into which the strips of TiO2 phase were extended. The microstructure of coatings produced from agglomerates of nanostructured particles also revealed the regions consisting of partially melted alpha-Al2O3 powders surrounded by the net-like structure formed from fully melted oxides that improved the coating properties. Along with the observed morphology diversity some changes in the chemical composition on the cross sections of obtained coatings have been also noticed.

• 出版日期2014-10