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Preparation method of alumina fiber-reinforced alumina ceramic matrix composite material

A technology of alumina ceramics and alumina fiber, which is applied in the field of composite material preparation, can solve problems such as long time, influence on composite material performance, oxide fiber performance, etc., achieve short production cycle, avoid fiber strength decline or pulverization, The effect of simple production process

Inactive Publication Date: 2019-11-19
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, chemical vapor deposition or high temperature pyrolysis process is used to prepare the interface layer. The temperature of the interface layer is relatively high and the time is long, which may have a certain impact on the properties of the oxide fiber and ultimately affect the performance of the composite material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The steps of the method for preparing the alumina fiber reinforced alumina ceramic matrix composite material of the present invention are as follows:

[0028] 1. Immerse the alumina fiber fabric in an ethanol solution containing 5% PVA, and take it out for 5-10 minutes; place the impregnated fiber fabric in the air until the organic solvent is completely volatilized, and then treat the fiber fabric at 550 ° C for 2 hours Preparation of carbonaceous coatings. Repeat the above steps 3 times, the thickness of carbon-containing coating reaches 6nm;

[0029] 2. Put 55wt% of alumina powder, 1.5wt% of calcium oxide powder, 1.0wt% of magnesium oxide powder, 2.5wt% of silicon oxide powder, and 40wt% of polyaluminoxane solution with a particle size of 0.1 μm in the The ball mill is mixed evenly in the ball milling tank to obtain a uniformly dispersed alumina ceramic slurry; the prepared ceramic slurry is evenly painted on the surface of the alumina fiber twill fabric, and dried ...

Embodiment 2

[0032] The steps of the method for preparing the alumina fiber reinforced alumina ceramic matrix composite material of the present invention are as follows:

[0033] 1. Immerse the alumina fiber fabric in an ethanol solution containing 5% PVA and take it out for 5-10 minutes; place the impregnated fiber fabric in the air until the organic solvent is completely volatilized, and then treat the fiber fabric at 550 ° C for 2 hours to prepare carbonaceous coatings. The above steps were repeated 4 times, and the thickness of the carbon-containing coating reached 8 nm.

[0034] 2. Put 60wt% of alumina powder, 3.0wt% of manganese oxide powder, 1.5wt% of titanium oxide powder, 0.5wt% of lanthanum oxide powder and 35wt% of polyaluminoxane solution with a particle size of 0.2 μm in a The ball mill is mixed evenly in the ball mill tank to obtain a uniformly dispersed alumina ceramic slurry; the prepared ceramic slurry is evenly brushed on the surface of the alumina fiber forged fabric, a...

Embodiment 3

[0037] The steps of the method for preparing the alumina fiber reinforced alumina ceramic matrix composite material of the present invention are as follows:

[0038] 1. Immerse the alumina fiber fabric in an ethanol solution containing 5% PVA and take it out for 5-10 minutes; place the impregnated fiber fabric in the air until the organic solvent is completely volatilized, and then treat the fiber fabric at 550 ° C for 2 hours to prepare carbonaceous coatings. Repeat the above steps 5 times, and the thickness of the carbon-containing coating reaches 10 nm.

[0039] 2. The particle size of 0.3μm alumina powder 70wt%, manganese oxide powder 2.0wt%, titanium oxide powder 1.5wt%, calcium oxide powder 1.0wt%, lanthanum oxide powder 0.5wt%, polyaluminum oxide powder Oxane solution of 25wt%, placed in a ball mill tank and ball-milled and mixed evenly to obtain a uniformly dispersed alumina ceramic slurry; the prepared ceramic slurry was evenly brushed on the surface of the alumina f...

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Abstract

The invention relates to a preparation method of an alumina fiber-reinforced alumina ceramic matrix composite material. The method comprises the following steps: impregnating an alumina fiber fabric in an ethanol solution of PVA to prepare a carbon-containing coating on the surface; mixing an alumina ceramic precursor solution with an alumina powder and a sintering aid powder to prepare a ceramicslurry, brushing the surface of the prepared alumina fiber fabric, provided with the carbon-containing coating on the surface, with the slurry to prepare an alumina fiber prepreg, and paving, hot-pressing and sintering the prepreg to obtain the alumina fiber fabric-reinforced alumina ceramic matrix composite material. The carbon-containing coating is oxidatively decomposed in the sintering processto produce a gap-type interface layer between the fiber and the matrix.

Description

technical field [0001] The invention relates to a preparation method of an alumina fiber reinforced alumina ceramic matrix composite material, and belongs to the technical field of composite material preparation. Background technique [0002] Alumina / alumina ceramic matrix composites refer to a class of materials that use alumina ceramics as the matrix and are compounded with alumina fibers. This type of material has the characteristics of low density, high temperature resistance, and oxidation resistance. Compared with SiC matrix composites, alumina / alumina ceramic matrix composites have better environmental stability and lower cost, and the material may serve in a gas environment of 1000℃-1400℃ for a long time. Alumina / alumina ceramic matrix composites have excellent high-temperature oxidation resistance, and are ideal candidates for high-temperature aerobic environments. They have great application potential in aerospace hot-end components such as engine combustion chambe...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/10C04B35/628
CPCC04B35/10C04B35/62839C04B2235/5224C04B2235/602C04B2235/5445C04B2235/656C04B2235/6567C04B2235/77C04B2235/96
Inventor 杨瑞焦健吕晓旭齐哲姜卓钰杨金华
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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