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

Active Publication Date: 2014-02-19
山东鲁阳浩特高技术纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The polycrystalline mullite short fiber metal matrix composite material developed in the 1980s has light weight, high temperature resistance, wear resistance, fatigue resistance, low thermal expansion coefficient and relatively low price, but due to the use of inorganic strong acids, it has caused environmental pollution. Moreover, the fiber has low softness, poor toughness, and high brittleness index, and there has always been a problem of pulverization of polycrystalline mullite fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a method for preparing polycrystal mullite fibers, which is characterized by comprising the following steps of: dissolving aluminite powder into a mixture of formic acid and acetic acid, and heating and refluxing to prepare mixed sol solution of aluminium basic and aluminium acetate; adding acid silicone sol without sodium into the mixed sol of aluminium basic and aluminium acetate; adding spinning auxiliaries into the evenly mixed solution; adding a surface active agent in the mixture; adding one or more of tartaric acid, citric acid or lactic acid in spinning dope; fibering the mixture under the condition of injection or thrown silk; initially drying polycrystal alumina fiber strand; and heating the polycrystal alumina fiber strand at the temperature of 500-1,400 DEG C. The polycrystal mullite fiber prepared by the method is free from using inorganic strong acid, cannot cause environment pollution, has high fiber softness, good toughness and low friability index, and solves the problem of pulverization of the polycrystal mullite fiber, which always exists.

Description

technical field [0001] The invention relates to a preparation method of inorganic fiber material, in particular to a preparation method of polycrystalline mullite fiber. Background technique [0002] Mullite fiber is a new type of lightweight inorganic fiber material developed in the 1970s. Compared with ordinary alumina fibers, mullite fibers not only have the advantages of high strength and high modulus, but also have high temperature resistance, low thermal conductivity and high resistance to chemical erosion. The service temperature is 1300-1600 ° C. Therefore, it is widely used in aerospace, atomic energy and large-scale metallurgical industrial furnaces (steel rolling heating furnaces, soaking furnaces), electric porcelain firing kilns and ceramic baking kilns in the ceramic industry, high-temperature kilns in the refractory industry, etc., which can save a lot of energy. [0003] The polycrystalline mullite short fiber metal matrix composite material developed in the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08
Inventor 鹿成洪荆桂华刘超
Owner 山东鲁阳浩特高技术纤维有限公司
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