Preparation method of alkaline-earth metal reinforced continuous aluminum silicate ceramic fiber

A technology of aluminum silicate ceramics and alkaline earth metals, which is applied in the field of preparation of continuous aluminum silicate ceramic fibers, can solve problems such as poor precursor gel spinning performance, and achieves simplified high-temperature calcination process, high mechanical tensile strength, The effect of maintaining uniformity

Active Publication Date: 2022-01-07
QUANGANG PETROCHEM RES INST OF FUJIAN NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sol-gel method is currently the main method for producing continuous aluminum silicate ceramic fibers, but the production of aluminum silicate ceramic fibers by the sol-gel method has a key technical bottleneck, that is, the spinning performance of the precursor gel of the aluminum silicate ceramic fiber poor

Method used

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  • Preparation method of alkaline-earth metal reinforced continuous aluminum silicate ceramic fiber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing continuous aluminum silicate ceramic fibers reinforced by alkaline earth metals, comprising the steps of:

[0031] S1: Dissolve and disperse 10 g of aluminum nitrate in 150 ml of water, and disperse for 2 hours under electric stirring under continuous ultrasonic conditions. Add 40 g of aluminum isopropoxide to the aluminum nitrate hydrolyzate, and disperse for 2 hours under electric stirring under continuous ultrasonic conditions. Then, electric stirring was continued at 60°C for 6 hours to obtain a mixed aluminum salt hydrolyzate.

[0032] S2: Add 20% calcium nitrate-magnesium nitrate mixed aqueous solution (molar ratio of calcium to magnesium: 1.2:1) to the above mixed aluminum salt hydrolyzate in the form of spray, the aqueous solution contains 15% PVP and EDTA disodium (PVP and EDTA disodium The mass ratio is 5: 1), and the spraying time is not shorter than 15 minutes to prevent the temperature fluctuation of the reaction system, and the mola...

Embodiment 2

[0039] A method for preparing continuous aluminum silicate ceramic fibers reinforced by alkaline earth metals, comprising the steps of:

[0040] S1: Dissolve and disperse 20 g of aluminum nitrate in 150 ml of water, and disperse for 3 hours under electric stirring under continuous ultrasonic conditions. Add 50 g of aluminum isopropoxide to the aluminum nitrate hydrolyzate, and disperse for 3 hours under electric stirring under continuous ultrasonic conditions. Then electric stirring was continued at 60°C for 8 hours to obtain a mixed aluminum salt hydrolyzate.

[0041] S2: Add 20% calcium nitrate-magnesium nitrate mixed aqueous solution (molar ratio of calcium to magnesium: 2:1) to the above-mentioned aluminum salt hydrolyzate in the form of spray, the aqueous solution contains 15% PVP and disodium EDTA (the mass of PVP and disodium EDTA Ratio of 3: 1), the spray addition time is not shorter than 15 min, in order to prevent the temperature fluctuation of the reaction system, ...

Embodiment 3

[0048] A method for preparing continuous aluminum silicate ceramic fibers reinforced by alkaline earth metals, comprising the steps of:

[0049] S1: Dissolve and disperse 10 g of aluminum nitrate in 150 ml of water, and disperse for 2 hours under electric stirring under continuous ultrasonic conditions. Add 40 g of aluminum isopropoxide to the aluminum nitrate hydrolyzate, and disperse for 2 hours under electric stirring under continuous ultrasonic conditions. Then, electric stirring was continued at 60°C for 6 hours to obtain a mixed aluminum salt hydrolyzate.

[0050] S2: Add 20% calcium nitrate-magnesium nitrate-strontium nitrate mixed aqueous solution (molar ratio of calcium to magnesium and strontium 1.2 : 0.6 : 0.6) in the form of spray to the above mixed aluminum salt hydrolyzate, the aqueous solution contains 15% PVP and disodium EDTA (The mass ratio of PVP to disodium EDTA is 3: 1), and the spraying time should not be shorter than 15 minutes to prevent the temperatur...

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Abstract

The invention discloses a preparation method of alkaline-earth metal enhanced continuous aluminum silicate ceramic fibers, which comprises the following steps: firstly, preparing aluminum salt hydrolysate by ultrasonic and constant-temperature stirring, and recording as a solution A; dissolving alkaline earth metal salt in a mixed aqueous solution of EDTA disodium and PVP to obtain a solution B, adding the solution B into the solution A in a spraying form, and conducting stirring at a constant temperature to obtain a solution C; adding tetraethoxysilane and sodium silicate into the solution C, and conducting heating and stirring to obtain a solution D; adding the solution B into the solution D in a spraying form, and conducting stirring at constant temperature; stirring and reacting the system under slight boiling, and conducting concentrating to obtain precursor gel; aging the precursor gel under an infrared bulb to obtain gel; and laddering the gel, conducting spinning by using a combined reel, conducting air-drying, and directly carrying out high-temperature heat treatment by using a pipe to obtain the continuous aluminum silicate ceramic fiber. The continuous aluminum silicate ceramic fiber prepared by adopting a method of adding a metal ion chelating agent, spraying alkaline-earth metal salt and infrared-assisted aging and combining a drum spinning process is excellent in mechanical property.

Description

technical field [0001] The invention relates to the field of aluminum silicate ceramic fibers, in particular to a method for preparing continuous aluminum silicate ceramic fibers reinforced with alkaline earth metals. Background technique [0002] Aluminosilicate ceramic fiber is a new type of ceramic fiber developed on the basis of alumina fiber. Because of its excellent high temperature strength, high temperature creep resistance, thermochemical stability, low thermal expansion coefficient and good dielectric properties, etc. , is considered to be an excellent new ceramic fiber material, and compared with alumina fiber, its raw material source is wider and its production cost is relatively lower. Aluminum silicate ceramic fibers can be used to make fiberboards, fiber felts, fiber blankets, etc., and are widely used in industrial kilns and thermal equipment linings to reduce heat storage losses; they can also be used as thermal insulation materials for aerospace application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/74C04B35/18C04B35/622C04B35/624
CPCC04B35/74C04B35/18C04B35/62245C04B35/624C04B2235/401C04B2235/6567C04B2235/96
Inventor 李忠水叶影向宇轩彭俊琛陈登龙刘金玲
Owner QUANGANG PETROCHEM RES INST OF FUJIAN NORMAL UNIV
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