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Micro silica, or Silica Fume in the special refractories can form a multi-layer protective layer during oxide. Micro silica has good mechanical properties and resistance to high temperature and oxidation. The special refractory with micro silica powder has obvious improving on the flowability, sintering properties, binding, filled pores performance.
Micro silica Physicochemical Properties:
1, Micro silica appearance: white；Refractoriness > 1600 ℃； Bulk density: 200 to 250 kg / m3.
2, Micro silica fineness: 90% fineness of 0.1μm; average particle size of 0.1 ~ 0.2μm, specific surface area: 20 ~ 28m2 / g. Micro silica fineness and specific surface area is 80 to 100 times of that of cement, 50 to 70 times of fly ash.
3, Micro silica particle morphology and mineralogical structure: Due to the surface tension of the phase change, micro silica fume forms into amorphous phase amorphous spherical particles with smooth surface, or a plurality of ball particles stick together.
Micro silica fume is a high activity pozzolanic material with large surface area. Micro silica in materials will play the role of lubrication with the tiny spherical body.
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