Serov Pavel Ivanovich, Postgraduate student, Penza State University (40 Krasnaya street, Penza, Russia), firstname.lastname@example.org
Background. The research objects are heat-resistant composite materials on the basis of a magnesia binder and a refractory fiber. The research subject is the influence of the chemical compound and parameters of the technological process on physical and mechanical properties of the heat-resistant material. The purpose of the present work is to replace binders that burn out during functioning, expensive and toxic organic binders with the magnesia binder.
Materials and methods. In the research the author used magnesium sulfate (epsomite), mullite fiber in a form of rolls, heat insulating and heat-resistant dispersed aluminosilicate glass fiber, exfoliated vermiculate.
Results. When the magnesium sulfate solution has a density in range 1.04 to 1.15 g/cm3, the composite fiber widgets have a density in range 150 to 350 kg/m3, bending strength up to 2 kg/cm2, and the linear shrinking not more than 2 %. Introduction of 40–50 % of a grain-formed filler increases diffusion of gases into the materials, thus, the speed of air flow through the material increases 2–2.5 times and wetness after forming decreases up to 120–150 % that allows to predict a significant decrement of time and energy spent on drying.
Conclusions. The author developed the compounds of fiber products on the basis of the magnesia binder with average density of 250–600 kg/m3 and operating temperature of 1100–1200 °C, being in no way inferior to the existing products on the basis of refractory clay and polyvinyl acetate dispersion.
heat-resistant composite material, magnesia cement, heat-resistant fiber, cement aggregates, sulfate solution, gas permeability
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