Polycrystalline alumina fiber liner and manufacturing method thereof
A technology of polycrystalline alumina and fiber pads, applied in the field of fiber pads, can solve problems such as increased slag balls, fiber cracks, and fiber structure damage, and achieve the effect of process improvement
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Embodiment 1
[0059] Dissolve 940g of crystalline aluminum chloride (content 97%) in 3200g of water, then add 500.5g of metal aluminum powder (particle size is 70~100 mesh, aluminum content > 99%), stir and react at 80°C until the solution is completely clear, and react A small amount of water volatilized during the process, and a very small amount of unreacted metal aluminum powder was filtered out to obtain a colorless and transparent basic aluminum chloride aqueous solution with an alumina content of 27.8wt.% and an aluminum / chlorine molar ratio of 1.97.
[0060] Add 35g citric acid (citric acid monohydrate content 99%), 2202g alkaline silica sol (average particle diameter 7 nanometers, silicon dioxide content 20%), 1285g polyvinyl alcohol aqueous solution ( 2088 type, concentration 5wt.%).
[0061] After mixing evenly, heat and distill at atmospheric pressure to obtain a colloid with a viscosity of 1.6 Pa·s (measured at 25°C) and good spinnability.
[0062] Use a spinning disk with a d...
Embodiment 2
[0068] Formaldehyde acetic acid glue, add 600 grams of metal aluminum powder (particle size is 70~100 mesh, aluminum content > 99%), add 3888g of formic acid and 791g of acetic acid mixed acid, add water to adjust the aluminum concentration in the solution (according to alumina conversion) To about 15wt.%, under the condition of 90-100°C, heat and reflux for reaction, filter out a very small amount of unreacted metal aluminum powder, and obtain a transparent polymerized aluminum formate acetate solution. Add 2202 grams of acidic silica sol (average particle size 7 nm, silicon oxide content 20%), 1355 grams of polyvinylpyrrolidone aqueous solution concentration (K90 type, concentration 3%) and 45 grams of lactic acid. After mixing the above liquids evenly, heat and distill under reduced pressure at a vacuum of -0.7MPa to obtain a colloid with a viscosity of 2.1Pa·s (measured at 25°C) with good spinnability. A spinneret with a hole diameter of 0.2 mm, a hole spacing of 8.0 mm, a...
Embodiment 3
[0074] On the basis of Example 1, the ratio of aluminum to silicon is 85:15, 1185g of crystalline aluminum chloride (content 97%) is dissolved in 4765g of water, and then 581g of metal aluminum powder (particle size is 325~350 mesh, aluminum content> 99%) is added ), stirred and reacted at 50°C until the solution was completely clear (a small amount of water volatilized during the reaction), filtered out a very small amount of unreacted metal aluminum powder, and obtained a colorless and transparent aluminum oxide content of 22.8wt.%. Aqueous aluminum chloride solution having a molar / chlorine ratio of 1.83. Add 1179g alkaline silica sol (average particle size 25nm, silicon dioxide content 20%), 1190g polyvinyl alcohol aqueous solution (1799 type, concentration 8wt.%), and 150g acetic acid to this basic aluminum chloride aqueous solution. After mixing evenly, heat and distill under reduced pressure at a vacuum of -0.6MPa to obtain a colloid with a viscosity of 7.6Pa·s (measured...
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