Method for preparing polycrystal mullite fibers
A polycrystalline mullite and fiber technology, applied in the direction of artificial filaments made of inorganic materials, can solve the problems of low fiber softness, high brittleness index, environmental pollution, etc., and achieve high fiber softness, low brittleness index, and good toughness Effect
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Embodiment 1
[0022] Dissolve 27g of aluminum powder in a mixed acid of 184g of formic acid and 90g of acetic acid, add demineralized water, adjust the concentration of alumina in the sol to about 20%, and reflow at a temperature of 90-100°C, heat and dissolve to obtain a clear and transparent Aluminum oxide sol, filter to remove impurities; according to the molar ratio of Al2O3 / SiO2, add acidic silica sol, 1 drop of isobutanol, 5% by mass of tartaric acid, and 3% by mass of corn syrup at 50-60°C Concentrate under vacuum to a clear colloid suitable for fiber formation. The viscosity of the colloid is 20-100 poise at 20°C. The colloid is clear and transparent, and it is stable for more than 6 months and still maintains its original properties. Use the spinning machine of patent 00267325 claim to carry out fiber-forming experiment. The ambient temperature for fiber formation is 15-30℃, and the relative humidity is 20-70%. Send it to the drying belt, and then enter the heat treatment furnace ...
Embodiment 2
[0024] Dissolve 27g of aluminum powder in the mixed acid of 184g of formic acid and 180g of acetic acid, add some demineralized water, adjust the concentration of alumina in the sol to about 10%, and reflow at a temperature of 90-100°C, heat and dissolve to obtain a clear and transparent Alumina sol, filtered to remove impurities; add acidic silica sol, 1 drop of isobutanol, 3% corn syrup by mass according to the ratio of Al2O3 / SiO2 molar ratio of 3:1, and concentrate in vacuum at 50-60°C to suitable It is a clear colloid for fiber formation, the viscosity of the colloid is 20-100 poise, the colloid is opaque, and the colloid is whitish. Use the spinning machine of patent 00267325 claim to carry out fiber-forming experiment. The ambient temperature for fiber formation is 15-30℃, and the relative humidity is 20-70%. Send it to the drying belt, and then enter the heat treatment furnace for calcination heat treatment. The treatment temperature is 1400°C. After treatment, soft an...
Embodiment 3
[0026] According to the molar ratio of Al2O3 / SiO2 is that the ratio of 3: 1 adds acidic silica sol in embodiment 1, 1 drop of isobutanol, the tartaric acid of 5% quality, the polyoxyethylene of 3% quality, vacuum at 50~60 ℃ Concentrated to a clear colloid suitable for fiber formation, the viscosity of the colloid is 20-100 poise at 20°C, the colloid is clear and transparent, and it remains stable for more than 6 months and still maintains its original properties.
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