Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2016 - zeszyt 6

Structure and properties of the FeAl (HVOF, HVAF, DGS) coatings for power industry

10.15199/28.2016.6.1

nr katalogowy: 103151
10.15199/28.2016.6.1

Recently, some systematic studies have been conducted on microstructural changes and material properties of B2 FeAl coatings sprayed by supersonic stream metallization in HVOF (High Velocity Oxygen Fuel), HVAF (High Velocity Air Fuel) and DGS (Detonation Gas Spraying) conditions. The present paper reports the results and analysis of HVOF, HVAF and DGS supersonic spraying on the structure and properties of Fe-Al type coatings obtained from spraying the Fe40Al0.05Zr at. % +50 ppm B intermetallic feedstock powder on a C45 steel substrate. A comprehensive study of the coating performances was conducted in relation to their material parameters by taking into account technological conditions affecting the formation of a structure in the ultrasonic spraying technologies. Analysis included chemical-phase composition inheritance, morphology of the grains, and porosity as well as oxidation of the coating material, hardness and abrasive resistance. These properties were analysed to determine if, Fe-Al coatings could be used as a potential material in the elements of gas turbines and boilers. Key words: Fe-Al type coatings, HVOF, HVAF, and DGS ultrasonic spraying technologies.1. INTRODUCTION The FeAl and Fe3Al-based iron aluminides are of interest as potential materials for hot structural applications, and they are promising substitutes for stainless steel and cast iron at room temperature, both as bulk materials and as coatings [1, 2]. Their promise is due to their good mechanical properties, relatively low density (5.56 g/ cm3 for the FeAl phase), excellent corrosion resistance in oxidizing and sulfurizing atmospheres (a result of their ability to form a highly protective Al2O3 scale), and low manufacturing cost [2, 3]. However, their use as bulk materials has been limited by their brittleness at room temperature and poor creep resistance [4]. The implementation of the Fe-Al type intermetallics as protective coatings can reduce these drawbacks. A[...]

Bibliografia

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