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

A technology of alumina fiber and porous alumina, which is applied in ceramic products, applications, household appliances, etc., can solve the problems of fiber loss of reinforcement, long preparation cycle, high sodium/calcium ion content, etc., to achieve short production cycle and avoid fiber The effect of strength reduction or pulverization and 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, sols are generally used to prepare ceramic slurry. The high content of sodium / calcium ions in the sol will directly affect the high-temperature mechanical properties of the composite material, and most of the sols are strongly acidic or alkaline. When the fiber is combined, it is easy to corrode the fiber, so that the fiber loses its reinforcing effect
And it needs to be impregnated repeatedly, and the preparation cycle is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The process of the method for preparing the alumina fiber reinforced porous alumina ceramic matrix composite material of the present invention is as follows:

[0025] Put 60wt% of alumina powder with a particle size of 0.1μm and 40wt% of polyaluminoxane solution in a ball mill tank and mix evenly to obtain a uniformly dispersed alumina ceramic slurry; apply the prepared ceramic slurry evenly Place the prepreg on the surface of the alumina fiber twill fabric and place it in the air to dry to 85% of the original weight to obtain the prepreg. Lay the prepreg in a mold and heat it in a vacuum press after the layup. Then, the hot-pressed preform is sintered in a ceramic sintering furnace with a sintering temperature of 1000° C. and a sintering time of 6 hours to finally obtain a porous matrix ceramic matrix composite material.

[0026] The porosity of the composite material is 25%, and the density of the composite material is 2.75g / cm 3 , The tensile strength is 180MPa.

Embodiment 2

[0028] The process of the method for preparing the alumina fiber reinforced porous alumina ceramic matrix composite material of the present invention is as follows:

[0029] Put 60wt% of alumina powder with a particle size of 0.2μm and 40wt% of polyaluminoxane solution in a ball mill tank and mix evenly to obtain a uniformly dispersed alumina ceramic slurry; apply the prepared ceramic slurry evenly Place the prepreg on the surface of the alumina fiber twill fabric and place it in the air to dry to 85% of the original weight to obtain the prepreg. Lay the prepreg in a mold and heat it in a vacuum press after the layup. Then, the hot-pressed preform is sintered in a ceramic sintering furnace at a sintering temperature of 1100°C and a sintering time of 5 hours to finally obtain a porous matrix ceramic matrix composite material.

[0030] The porosity of the composite material is 23%, and the density of the composite material is 2.85g / cm 3 , The tensile strength is 210MPa.

Embodiment 3

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

[0033] Put 60wt% of alumina powder with a particle size of 0.3μm and 40wt% of polyaluminoxane solution in a ball mill tank and mix evenly to obtain a uniformly dispersed alumina ceramic slurry; apply the prepared ceramic slurry evenly Place the prepreg on the surface of the alumina fiber twill fabric and place it in the air to dry to 85% of the original weight to obtain the prepreg. Lay the prepreg in a mold and heat it in a vacuum press after the layup. Then, the hot-pressed preform is sintered in a ceramic sintering furnace at a sintering temperature of 1200°C and a sintering time of 4 hours to finally obtain a porous matrix ceramic matrix composite material.

[0034] The porosity of the porous matrix in the composite material is 27%, and the density of the composite material is 2.68g / cm 3 , The tensile strength is ...

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Abstract

The invention relates to a preparation method of an alumina fiber reinforced porous alumina ceramic matrix composite material. The method comprises the following steps: mixing an alumina ceramic precursor solution with an alumina powder to prepare a ceramic slurry, brushing the surface of an alumina fiber fabric 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 surface of the fiber in the composite material has no interface layer, and the tougheningof a porous matrix is adopted. The alumina ceramic precursor is mixed with the alumina powder to prepare the slurry in order to prepare the porous matrix, and when the porous matrix is formed, the difficult-to-sinter alumina powder forms the skeleton of the porous matrix, and the easy-to-sinter alumina ceramic precursor forms the continuous phase of the matrix, so alumina powder particles canbe bonded, and the strength is provided for the porous matrix structure.

Description

Technical field [0001] The invention is a preparation method of alumina fiber reinforced porous alumina ceramic matrix composite material, which belongs to the technical field of composite material preparation. Background technique [0002] Alumina / alumina ceramic matrix composite material refers to a type of material that uses alumina ceramic as the matrix and is composited with alumina fibers. This type of material has the characteristics of low density, high temperature resistance, and oxidation resistance. Compared with SiC-based composite materials, alumina / alumina ceramic-based composite materials have better environmental stability and lower cost. The material may serve for a long time in a gas environment of 1000℃-1400℃(10 4 h). 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 engin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/80C04B38/08C04B35/645
CPCC04B35/10C04B38/08C04B35/645C04B2235/77C04B2235/96C04B38/0074
Inventor 杨瑞焦健齐哲杨金华姜卓钰焦春荣
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS