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Microstructure of Al Si slurry coating on austenitic high temperature creep resistant cast steel

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Document pages: 12 pages

Abstract: The microstructure of slurry aluminide coating was examined by scanning electron microscope, X-ray microanalysis and X-ray diffraction. Aluminide coating was prepared on austenitic high temperature creep resistant cast steel in air atmosphere. The function of aluminide coating is to protect equipment components from high temperature corrosion in carburizing atmosphere under thermal shock conditions. The resulting coating has a multilayer structure composed of intermetallic compounds. The newly developed slurry consists of aluminum and silicon powder; Sodium chloride, potassium chloride and sodium fluoride halide salts; And an aqueous solution of soluble glass as an inorganic binder. Application of inorganic binder in mud allowed to be producedthe coatings in one single step without additional annealing at an intermediate temperature as it is when applied organic binder. The coatings were formed on both: the ground surface and on the raw cast surface. The main technological parameters were temperature (732–1068°C) and time of annealing (3.3–11.7 h) and the Al Si ratio (4–14) in the slurry. The rotatable design was used to evaluate the effect of the production parameters on the coatings thickness. The correlation between the technological parameters and the coating structure was determined.

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