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A kind of preparation method of alumina fiber-reinforced high-temperature-resistant and anti-scour thermal insulation material

A technology of alumina fiber and alumina, which is applied in the field of ceramic matrix composite materials, can solve the problems of poor high temperature resistance of products, many processes, and long preparation cycle, so as to improve strength and high temperature resistance, increase sintering temperature, and shorten production cycle effect

Active Publication Date: 2021-05-04
湖南合为新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Multiple impregnations endow the material with higher strength, but also greatly increase the density of the material, which is not suitable for application scenarios that require light weight of the material
And because it requires repeated dipping (too many dips), the production cost of the product is extremely high
[0004] Aiming at the problems of long preparation period, too many processes, too long time-consuming, poor high-temperature resistance of the product, single form of product prefabricated body, and inability to meet many application fields in the preparation of high-temperature-resistant and anti-scouring alumina thermal insulation composite materials in the current prior art Product demand, this invention designs and prepares a material that can meet the requirements of high temperature resistance, erosion resistance, heat preservation and insulation and high temperature resistance, erosion resistance, heat preservation and insulation for the first time

Method used

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  • A kind of preparation method of alumina fiber-reinforced high-temperature-resistant and anti-scour thermal insulation material
  • A kind of preparation method of alumina fiber-reinforced high-temperature-resistant and anti-scour thermal insulation material
  • A kind of preparation method of alumina fiber-reinforced high-temperature-resistant and anti-scour thermal insulation material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] S1. Preparation of alumina preform:

[0071] Prepare an alumina preform with pores according to requirements; the alumina preform is alumina wool, and the alumina wool density is 0.8g / cm 3 , the thickness is 25mm, and the thermal conductivity at 25-1600°C is 0.05-0.45W / (m·K).

[0072] S2. prepare the slurry of high temperature resistant coating:

[0073]Put the ceramic powder, solvent, dispersant, and adhesive in a ball mill in proportion to the ball mill and mix them evenly, then add ammonia water to adjust the pH value to 7-9, and stir evenly to prepare the alumina fiber high temperature resistant coating slurry ;

[0074] The ceramic powder is α-Al 2 o 3 Aluminum oxide ceramic powder, yttrium oxide. The particle size of the ceramic powder is 0.1-0.3 microns (the mass ratio of the two is 1:1).

[0075] The solvent is deionized water.

[0076] The dispersant is acrylic resin.

[0077] The adhesive is acrylic resin.

[0078] In S2, the mass ratio of ceramic pow...

Embodiment 2

[0098] S1. Preparation of alumina preform:

[0099] Prepare alumina preforms with pores according to requirements; the alumina preforms are alumina felts, and the alumina felts are composed of alumina fiber cloth, alumina cotton and alumina textile threads, with two layers of alumina on the top and bottom Thick fiber cloth with alumina cotton in the middle, each strand of alumina textile thread is composed of 1000 continuous alumina fibers, and the thermal conductivity of the felt at 25-1600°C is 0.05-0.5W / (m·K). The average density of the alumina felt is 1.2g / cm 3 , the thickness is 12mm.

[0100] S2. prepare the slurry of high temperature resistant coating:

[0101] Put the ceramic powder, solvent, dispersant, and adhesive in a ball mill in proportion to the ball mill and mix them evenly, then add ammonia water to adjust the pH value to 7-9, and stir evenly to prepare the alumina fiber high temperature resistant coating slurry ;

[0102] The ceramic powder is zirconia an...

Embodiment 3

[0112] Other conditions are consistent with embodiment 1; The difference is

[0113] The alumina preform is alumina fiber cloth, and the density of the alumina cloth is 1.8g / cm 3 , The thickness is 0.3mm, the weaving method is double twill, and the warp or weft yarn per 1cm of the fabric is 9 strands.

[0114] The finished density of the composite material obtained in S5 is 2.2 g / cm 3 When the porosity is 30% and the fiber volume content is 28%, the tensile strength of the obtained product is 202MPa, the bending strength is 380MPa, and the fracture toughness is 8MPa.m 1 / 2 , high temperature resistance is greater than or equal to 2200°C, and the thermal conductivity is 0.5W / (m·K); when the gas flushing speed is 6.8km / s, the time is 50s, and the temperature is 2200°C, its mass loss is less than 1%.

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Abstract

The invention belongs to the technical field of ceramic-based composite materials, and in particular relates to a preparation method of an alumina fiber-reinforced high-temperature-resistant and erosion-resistant thermal insulation material. The preparation method comprises the following steps: S1. preparation of alumina preform, S2. preparation of slurry for high temperature resistant coating, S3. preparation of high temperature resistant coating of alumina preform, S4 preparation of composite material green body, S5 low temperature sintering Preparation of alumina matrix composites. In the present invention, the alumina preform is soaked in the modifier, and after the soaking is completed, the slurry obtained in S2 is impregnated and / or coated and / or deposited on the modified green body. This design can be fast, efficient, and Uniformly obtain high-quality high-temperature resistant coatings, and cooperate with subsequent processes to prepare materials that can meet the requirements of high temperature resistance, erosion resistance, thermal insulation and high temperature resistance, erosion resistance, thermal insulation and insulation. The invention has reasonable step design, simple and controllable process, and is convenient for large-scale industrial application.

Description

technical field [0001] The invention belongs to the technical field of ceramic-based composite materials, and in particular relates to a high-temperature-resistant and erosion-resistant thermal insulation material and a preparation method thereof. Background technique [0002] Alumina ceramic fibers have excellent properties such as high temperature resistance, high strength, high stiffness, low density, corrosion resistance, high elasticity and suitable for weaving. They are mainly compounded with high temperature resistant coatings / alumina matrix to obtain composites reinforced by alumina fibers with excellent toughness. Material. [0003] Alumina fiber-reinforced ceramic matrix composites have the characteristics of low density, high specific strength, high specific modulus, high temperature resistance, oxidation resistance, and good reliability. Load-bearing materials are widely used in high-performance aero-engines, high-temperature furnaces, heavy-duty vehicle exhaust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/84C04B35/628C04B35/10
CPCC04B35/10C04B35/62802C04B35/62844C04B35/62886C04B2235/3217C04B2235/3222C04B2235/3225C04B2235/3232C04B2235/3244C04B2235/3293C04B2235/3418C04B2235/425C04B2235/447C04B2235/52C04B2235/5224C04B2235/5292C04B2235/608C04B2235/61C04B2235/77C04B2235/96C04B2235/9607
Inventor 阳海棠
Owner 湖南合为新材料科技有限公司
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