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Preparation method of alpha-Al2O3/mullite multiphase ceramic fiber

A technology of composite ceramics and mullite, which is applied in the direction of inorganic raw materials such as artificial filaments, can solve the problems of environmental pollution, high risk, and difficulty in large-scale preparation, and achieve high surface activity, low cost, and uniform microstructure Effect

Inactive Publication Date: 2019-08-02
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method uses ammonia gas in the sintering process, which is dangerous and easy to cause environmental pollution, and it is difficult to prepare on a large scale

Method used

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  • Preparation method of alpha-Al2O3/mullite multiphase ceramic fiber
  • Preparation method of alpha-Al2O3/mullite multiphase ceramic fiber
  • Preparation method of alpha-Al2O3/mullite multiphase ceramic fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] an α-Al 2 o 3 The preparation method of / mullite multi-phase ceramic fiber comprises steps:

[0045] (1) Add 645g of aluminum sulfate hexadecahydrate and 9.0g of aluminum powder into 1000mL of deionized water and stir evenly, heat and reflux at 150°C for 10h until the aluminum powder reacts completely, cool and filter to obtain 13 Colloidal alumina sol, colloidal particle size 3nm, namely aluminum sol.

[0046] (2) Take 115.67g of aluminum sol obtained in step (1) and 10.0g of silica sol (the content of silicon dioxide is 30wt%) and mix evenly at 35°C, add 2.0g of α-Al 2 o 3 Dispersion (α-Al 2 o 3 content is 20wt%) and 10.0g polyvinylpyrrolidone, mix evenly, then aging and concentrating at 38°C and 0.095MPa vacuum conditions to a solid content of 35wt%, viscosity at 25°C is 1000Pa.s, can be obtained Spinable silica / aluminum sol.

[0047] (3) Utilize the above-mentioned spinnable silica / alumina sol to adopt dry spinning, and the gel fiber with a diameter of about 1...

Embodiment 2

[0056] an α-Al 2 o 3 The preparation method of / mullite multi-phase ceramic fiber comprises steps:

[0057] (1) The preparation of aluminum sol is as described in Example 1.

[0058] (2) Take 115.67g of aluminum sol obtained in step (1) and 5.0g of silica sol (the content of silicon dioxide is 30wt%) and mix evenly at 35°C, add 3.5g of γ-Al 2 o 3 Dispersion (γ-Al 2 o 3 content of 20wt%) and 3.0g of polyethylene oxide, mixed evenly, and then aged and concentrated at 38°C and 0.095MPa vacuum conditions to a solid content of 38wt%, and a viscosity of 830Pa.s at 25°C to obtain spinnable silicon / aluminum sol.

[0059] (3) Utilize the above-mentioned spinnable silicon / alumina sol to adopt dry spinning, and the gel fiber with a diameter of about 17 μm is prepared under the condition that the ambient temperature is 30° C. and the relative humidity is 30%, and the fiber is collected at a speed of 80 m / min. The speed winds the gel fiber on the take-up roll.

[0060] (4) Calcini...

Embodiment 3

[0063] an α-Al 2 o 3 The preparation method of / mullite multi-phase ceramic fiber comprises steps:

[0064] (1) Add 80.5g of aluminum chloride and 9.0g of aluminum powder into 1000mL of deionized water and stir evenly, heat and reflux at 180°C for 14h until the aluminum powder is completely reacted, cool and filter to obtain 13 Colloidal alumina sol, colloidal particle size 8nm, namely aluminum sol.

[0065] (2) Take 142.7g of aluminum sol obtained in step (1) and 10.0g of silica sol (the content of silicon dioxide is 30wt%) and mix uniformly at 35°C, add 3.0g of α-Fe 2 o 3 Dispersion (α-Fe 2 o 3 content is 20wt%) and 5.0g polyvinylpyrrolidone, mix evenly, then aging and concentrating at 38°C and 0.095MPa vacuum conditions to a solid content of 30wt%, viscosity at 25°C is 580Pa.s, can be obtained Spinable silica / aluminum sol.

[0066](3) Utilize the above-mentioned spinnable silica / alumina sol to adopt dry spinning, and the gel fiber with a diameter of about 16 μm is pre...

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Abstract

The invention provides a preparation method of an alpha-Al2O3 / mullite multiphase ceramic fiber. The preparation method comprises the following steps: mixing aluminum powder, aluminum salt and water, performing heating reflux at 110-200 DEG C till the aluminum powder reacts completely to form aluminum collosol, mixing the aluminum collosol prepared by the above method, silicasol, nano particle dispersing liquid and a spin finish aid, and performing aging, concentration, spinning and calcining to form the alpha-Al2O3 / mullite multiphase ceramic fiber, wherein the nano particle dispersing liquid is one or a combination of more than two of alpha-Al2O3 dispersing liquid, gamma-Al2O3 dispersing liquid or alpha-Fe2O3 dispersing liquid. A formation temperature difference of alpha-Al2O3 and a mullite crystal phase in the ceramic fiber is reduced by adding nano particles; and the dense ceramic fiber that is high in length, excellent in mechanical property and high in purity can be prepared at a lower temperature.

Description

technical field [0001] The present invention relates to a kind of α-Al 2 o 3 The invention discloses a preparation method of mullite composite ceramic fiber, which belongs to the technical field of inorganic non-metallic materials. Background technique [0002] Alumina fiber is a new type of ceramic material, its main component is alumina, and its performance in an oxidizing environment is significantly better than that of metal fibers, carbon fibers and non-oxide fibers. At the same time, the alumina-based ceramic continuous fiber has an ultra-fine or even nano-scale microstructure. Due to this nano-scale microstructure, it has good strength and flexibility and is widely used in machinery, metallurgy, chemical industry, petroleum, ceramics, glass, electronics and other industries are widely used. Alumina ceramic fibers have the advantages of high strength, high hardness, corrosion resistance, and wear resistance, but the grains of ceramic fibers with high alumina content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/185C04B35/622D01F9/08
CPCC04B35/62236C04B35/62227D01F9/08C04B2235/3272C04B2235/444C04B2235/443C04B2235/448C04B2235/96C04B2235/95
Inventor 陈代荣周欣欣贾玉娜焦秀玲
Owner SHANDONG UNIV
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