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Method for preparing aluminium oxide-silicon oxide fibre

A technology of silica fiber and alumina, applied in the direction of inorganic raw material rayon filament, etc., can solve the problems of fiber breakage, unsuitable reinforcement materials, etc., to achieve uniform and stable fiber quality, controllable nitrogen flow and heating program, and simple process. Effect

Inactive Publication Date: 2003-08-06
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alumina fiber obtained by this hydrothermal treatment method has a rich inner surface area and a large number of pores, which will become stress centers when subjected to external force and cause fiber fracture, so it is not suitable for use as a reinforcement material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Mix 120.7 g of AlCl 3 ·6H 2 O (analytically pure) was dissolved in 600 milliliters of distilled water, poured into a round-bottomed flask with 81.2 grams of aluminum flakes with a purity of 99.5%, refluxed at a temperature of 96°C for 10 hours, and filtered to obtain the Al / Cl ratio A colorless and transparent aluminum oxychloride sol of 1.98;

[0020] 2. Add 30 grams of ethanol and 15.2 grams of ethyl orthosilicate to the above colloid, and stir and reflux at 50°C for 2 hours, and filter to obtain a transparent aluminum-silicon composite sol;

[0021] 3. Add 0.9 g of polyethylene oxide with a molecular weight of 600,000 to the above-mentioned aluminum-silicon composite sol, stir until it is completely dissolved, then heat and concentrate at 40°C to obtain a uniform and transparent spinning stock solution with a viscosity of 20 poise (20°C) ;

[0022] 4. Pour the above spinning stock solution into the liquid material tank of the spinning device, control the air pr...

Embodiment 2

[0025] 1. Sol preparation and spinning method are the same as embodiment 1.

[0026] 2. The heat treatment process of the precursor fiber is as follows: the whole process adopts a heating rate of 2°C / min, and the control flow rate is 40ml / min to feed nitrogen gas. First, the above precursor fiber is kept at a temperature of 110°C for 60 minutes to remove the part The moisture contained in the fiber is heated up to 290°C and kept at a constant temperature for 60 minutes to remove part of the organic matter. Finally, it was calcined at 900° C. for 45 minutes in the air to obtain the alumina-silica fiber of the present invention. The AUTOGRAPH WinAG material performance testing machine of Shimadzu Corporation of Japan was used to test the tensile strength and elastic modulus of the fiber at a tensile rate of 2mm / min. The strength was 1092.9MPa, the modulus was 87.4GPa, and the specific surface was 20m 2 / g.

Embodiment 3

[0028] 1. 375.2 grams of Al(NO 3 ) 3 9H 2 O (analytically pure) was dissolved in 1000 milliliters of distilled water, poured into a round-bottomed flask with 100 grams of aluminum flakes with a purity of 99.5%, refluxed at a temperature of 100°C for 10 hours, and filtered to obtain a colorless and transparent Alumina precursor sol;

[0029] 2. Take 10 grams of DC5604 silicone surfactant from Air Products & Chemicals in the United States and 0.9 g of polyethylene oxide with a molecular weight of 600,000, add it to the above colloid and mix it evenly, heat and concentrate at 40 ° C to obtain a viscosity of 25 Poise (20°C) homogeneous and transparent spinning dope;

[0030] 3. Pour the above spinning stock solution into the liquid material tank of the spinning device, control the air pressure to 0.15MPa, hydraulic pressure to 0.03MPa, keep the liquid flow direction and the airflow direction at about 40°, at a temperature of 25°C and a relative humidity of Precursor fibers are...

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Abstract

The preparation method of aluminia-silica fibre uses water soluble inorganic aluminium salt and metal aluminium as main raw material, uses distilled water as solvent, and adopts the following steps: under the reflux condition utilizing hydrolysis and polymerization to obtain uniform transparent alumina precursor sol, adding a certain quantity of silicide and water soluble polymer as spinning adjuvant into the sol, concentrating to obtain spinning dope with proper rheological property, using blast drawing method to make the spinning dope into precursor fibre, further heat treatment in nitrogengas atmospher to convert the alumina and silica precursor into alumina and silica so as to finally obtain the invented alumina-silica fibre.

Description

Technical field: [0001] The invention relates to a method for preparing inorganic fibers, in particular to a method for preparing alumina-silicon oxide fibers used as reinforcing materials for metal matrix and ceramic matrix composite materials. Background technique: [0002] Alumina fiber is a kind of fiber that has developed rapidly abroad since the 1970s. Because alumina fiber has a series of properties such as good chemical inertness, high specific surface area and low thermal conductivity, it can be used as high-temperature heat insulation and sound insulation materials, catalyst supports, and reinforcing agents for metal-based and ceramic-based composite materials. Wide range of uses. Especially in recent years, with the continuous development and application of fiber-reinforced matrix (resin, metal and ceramics, etc.) requirements. SiO2 2 As a crystal phase inhibitor, it has been recognized as an effective method to improve the high-temperature strength of alumina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08
Inventor 宋士玮王浩静温月芳王心葵
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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