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Preparation method of alumina fiber reinforced high-temperature-resistant anti-scouring 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 single product prefabrication, long time consumption, poor high temperature resistance of products, etc., and achieve obvious efficiency and product quality, high temperature resistant coating The effect of shortening the time

Active Publication Date: 2021-03-16
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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  • Preparation method of alumina fiber reinforced high-temperature-resistant anti-scouring thermal insulation material
  • Preparation method of alumina fiber reinforced high-temperature-resistant anti-scouring thermal insulation material
  • Preparation method of alumina fiber reinforced high-temperature-resistant anti-scouring thermal insulation material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] S1. Preparation of alumina preform:

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

[0072] S2. Preparation of slurry for high temperature resistant coating:

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

[0074] The ceramic powder is α-Al 2 O 3 alumina 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 an acrylic resin.

[0077] The adhesive is acrylic resin.

[0078] In S2, the mass ratio ...

Embodiment 2

[0098] S1. Preparation of alumina preform:

[0099] Prepare alumina preforms with pores according to requirements; the alumina preforms are alumina felts, which are composed of alumina fiber cloth, alumina wool and alumina textile threads, with two layers of alumina on the top and bottom A 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. Preparation of slurry for high temperature resistant coating:

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

[0102] The ceramic powder is zirconia and yttrium oxide. The par...

Embodiment 3

[0112] Other conditions are the same as in Example 1; the difference is that

[0113] The alumina preform is an 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 final density of the composite obtained by 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 , the high temperature resistance is greater than or equal to 2200℃, 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℃, the mass loss is less than 1%.

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Abstract

The invention belongs to the technical field of ceramic matrix composite materials, and particularly relates to a preparation method of an alumina fiber reinforced high-temperature-resistant anti-scouring thermal insulation material. The preparation method comprises the following steps: S1, preparation of an aluminum oxide preform; S2, preparation of slurry of a high-temperature-resistant coating;S3, preparation of a high-temperature-resistant coating of the aluminum oxide preform; S4, preparation of a composite material blank. According to the method, the aluminum oxide preform is soaked inthe modifier, and after soaking is completed, the slurry obtained in the step S2 is soaked and / or coated and / or deposited on the modified green body, so that the high-quality high-temperature-resistant coating can be quickly, efficiently and uniformly obtained through the design; and the material which can meet the requirements of high-temperature resistance, anti-scouring, heat preservation, heatinsulation and high-temperature resistance, anti-scouring, heat preservation and insulation at the same time is prepared by matching with a subsequent process. The method is reasonable in step design, simple and controllable in process and convenient for large-scale industrial application.

Description

technical field [0001] The invention belongs to the technical field of ceramic matrix composite materials, and in particular relates to a high temperature resistant and anti-scouring thermal insulation material and a preparation method thereof. Background technique [0002] Alumina ceramic fiber has excellent properties such as high temperature resistance, high strength, high stiffness, low density, corrosion resistance, high elasticity and suitable for weaving. 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. Bearing materials are widely used in high-performance aero-engines, high-temperature furnaces, heavy-duty vehicle exhaust emission devices, and aerospace rockets. It has a natural advantage in the direction of ablation resistance. Traditional ablation materials (including low-density abl...

Claims

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Application Information

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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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