Characterization and Microstructure of Thermal Sprayed Stainless Steel/Magnesium Oxide Nanocomposite Coatings
K. Janpin; S. Jiansirisomboon
Journal of Microscopy Society of Thailand
abstract：Stainless steel/magnesium oxide nanocomposite coatings were prepared by thermal spray technique. Magnesium oxide nano-particles (0, 1.25, 2.5, 5 and 10 wt%) were mixed with stainless steel 431 spray powder using ball milling for 1 hour. Microstructure and chemical composition of nanocomposite powders and coatings have been investigated via optical microscope with image analysis, scanning electron microscopy and energy- dispersive X-ray technique. In addition, hardness of the coatings was investigated using Vicker microhardness tester. The scanning electron micrographs revealed that magnesium oxide nano-particles adhered on stainless steel particles. Microstructures of pure stainless steel and stainless steel/magnesium oxide nano-composite coatings were rather similar. It showed Fe splat, oxide layers, un-melted particles and pores. The porosity of the nanocomposite coatings was found to increase with increasing magnesium oxide nano-powder content. The hardness of the coating containing 2.50 wt% magnesium oxide (385.6 HV0.3) was highest and higher than that of pure stainless steel coating (352.1 HV0.3).
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