Diffusion Coatings with the Participation of Titanium, Aluminium and Silicon on Surface of the Steel 12X18H10T
DOI:
https://doi.org/10.20535/1810-0546.2014.5.34780Keywords:
Steel 12Cr18Ni10Ti, Powder method, Diffusion coatings, Titanation, Titanium calorizing, Titanium-aluminum-silicon, Microhardness, Heat resistance, PorosityAbstract
Patterns of forming a multilayered diffusion coatings after complex saturation of titanium, aluminum and silicon to steel to improve heat resistance 12Cr18Ni10Ti were obtained and studied. The possibility of obtaining titanium-aluminum-silicon layers on steel 12Cr18Ni10Ti powder in containers with a gate in unpressurized conditions at temperature 1050 °C and with duration 4 hours was studied. As initial components powders of titanium, aluminum, silicon, aluminum oxide, ammonium chloride were used. The phase and chemical composition, structure and micro-hardness of the obtained coatings were investigated. For titanation and titanium-calorizing, coating phase composition consists of compounds zone Ti4Fe2O, Fe2Ti, TiS, the transition zone and for titanium-aluminum-silicon: Ti3(Al,Fe), (Fe,Al,Ni)2Ti, (Fe,Al,Ni)Ti, Ti(C,N,O) and the transition zone. In titanium-aluminum-silicon content in the coating zone Fe2Ti compounds in the layer is 1,5 % by weight, and in the transition zone at the boundary with the zone of connection – 1,2 % by weight. During oxidation of obtained coatings, degradation carries out in phase composition and structure. Heat-resistance of steel 12Cr18Ni10Ti with titanium aluminum siliconized coating increases 4,0 times in comparison with steel without coating.
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