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Castable Refractory Cement Process Detail

Refractory materials must be chemically and physically stable at high temperatures.  Depending on the operating environment, they need to be resistant to thermal shock, be  chemically inert, and/or have specific ranges of thermal conductivity and of the  coefficient of thermal expansion.Understanding the mineralogy of materials is very  necessary and understanding why they do what they do physically. For example, why does  a bentonite take three weeks to dry? Why does a fired bar made of calcium carbonate  and clay fracture into a powder after sitting for a few days? Why do two different  glaze slurries with the same clay content or even same recipe have different settling  and hardening behaviors.Why do some clays shrink more and yet dry with fewer cracks  than others, or why does one clay dry so much better than another of the same  plasticity?
Castable Refractory Cement is ideal for casting into custom shapes to replace worn-out  firebrick. Originally developed for use in blast furnaces, it has exceptional strength  and is abrasion resistant. It can be cast into irregular shapes, used to fill large  holes or cracks in masonry fireboxes or as a solid stone bed Why do two glazes of the  same chemistry but using different materials to supply that chemistry, melt at  different temperatures? Why do some glazes have serious blistering problems? Why do  some clays effloresce? Why are frits often better sources of oxides than raw  materials. All of these are mineralogy questions
Frit content is in the range 20-40%, depending on maximum firing temperature, while  other components are typical of fire brick: clays, feldspars, nepheline, kaolin,  micronized zircon, alumina and quartz. The content of plastic materials must be  suitable to ensure a homogeneous drying of glaze, Usually monoporosa frits contain low  percentages sodium, potassium and boron oxides because they actively generate a glassy  phase during heating .Compared to normal firing cycles for floor tiles, monoporosa  firing cycles show a longer preheating. This is a direct consequence of the reactions  of carbonates present in bodies

Pub Time : 2015-03-19 15:53:42 >> News list
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