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Faculty of Technology and Metallurgy, University of Belgrade , Belgrade , Serbia
Faculty of Technology and Metallurgy, University of Belgrade , Belgrade , Serbia
Faculty of Technology and Metallurgy, University of Belgrade , Belgrade , Serbia
For the development of refractory coatings with controlled rheological properties the influence of
micronized milling process was investigated. Change the properties of fillers based on cordierite,
primarily on changing the size and shape of grain fillers, dispersion and stability of the suspension of
the coating was investigated, also. Cordierite was obtained by synthesis in the solid state from the
weight of the assembled components: kaolin, alumina, talc. For the characterization of cordierite
these methods were applied: X-ray diffraction, differential thermal analysis, SEM and optical
microscopy. Micronized grinding of filler was done in a vibro mill in time (min): 15, 30, 60.
Optimization of composition and improvement of utility properties of the coating was achieved by a
choice of sizes and form factors grain activated filler, using different components of coatings, as well
as changing the process of developing coatings. The resulting coatings showed sizable sedimentation
stability (precipitated matter content of less than 4 % at 24 h), satisfactory fire resistance and
permeability to gases, easy application and adhesion to the surface of the sand mold, easy to adjust
the thickness of the coating layers, no bubbles, no cracking and abrasion the dried coating layers.
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