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Preparation method for oxide fiber-reinforced oxide porous ceramic matrix composite

A technology of oxide ceramics and composite materials, which is applied in ceramic products, applications, household appliances, etc., can solve the problems of long preparation cycle, and achieve the effect of avoiding the decrease of fiber strength, simple production process and promoting sintering.

Inactive Publication Date: 2018-11-27
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When preparing composite materials in this patent, repeated impregnation is required, and the preparation cycle is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 40wt% of alumina powder with a particle size of 1 μm, 15wt% of alumina powder with a particle size of 0.1 μm, 1.5wt% of calcium oxide powder, 1.0wt% of magnesium oxide powder, 2.5wt% of silicon oxide powder, 40wt% polyaluminoxane solution, placed in a ball mill tank and mixed evenly by ball milling to obtain a uniformly dispersed oxide ceramic slurry; evenly brush the prepared ceramic slurry on the surface of the alumina fiber twill fabric to control the oxide fiber in the composite The volume fraction in the material is 35%, and then the fiber fabric is placed in the air and dried to 80% of the original weight to obtain a prepreg; the prepreg is laid in a mold, and after the layup is completed, it is placed in a vacuum press Carry out hot pressing treatment, the temperature is 200°C, the pressure is 0.25MPa, and the time is 2h. Then the hot-pressed preform was sintered in a ceramic sintering furnace at a sintering temperature of 1200° C. and a sintering time of 6 hours...

Embodiment 2

[0033] 30wt% of mullite powder with a particle size of 2μm, 30wt% of alumina powder with a particle size of 0.15μm, 3.0wt% of manganese oxide powder, 1.5wt% of titanium oxide powder, and 0.5wt% of lanthanum oxide powder , polyaluminoxane solution 25wt%, polysiloxane 10wt%, place in the ball mill tank and mix evenly by ball milling to obtain a uniformly dispersed oxide ceramic slurry; the prepared ceramic slurry is evenly coated on the mullite fiber forging On the surface of the weave fabric, control the volume fraction of the oxide fiber in the composite material to 40%, and then place the fiber fabric in the air to dry to 90% of the original weight to obtain a prepreg; lay the prepreg in the mold , after laying up layers, carry out hot pressing treatment in a vacuum press at a temperature of 175°C, a pressure of 0.50 MPa, and a time of 0.5 h, and then sinter the hot-pressed preform in a ceramic sintering furnace at a sintering temperature of 1300°C, the sintering time is 0.5 ...

Embodiment 3

[0035] 40wt% of alumina powder with a particle size of 2 μm, 30wt% of alumina powder with a particle size of 0.2 μm, 2.0wt% of manganese oxide powder, 1.5wt% of titanium oxide powder, 1.0wt% of calcium oxide powder, Put 0.5wt% of lanthanum oxide powder and 25wt% of polyaluminoxane solution into a ball mill jar and mix evenly to obtain a uniformly dispersed oxide ceramic slurry; evenly brush the prepared ceramic slurry on the surface of the quartz fiber plain weave fabric , control the volume fraction of oxide fibers in the composite material to be 35%, and then place the fiber fabric in the air to dry to 85% of the original weight, that is, obtain the prepreg; lay the prepreg in the mold, lay up After completion, carry out hot-pressing treatment in a vacuum press at a temperature of 200°C, a pressure of 0.75 MPa, and a time of 1 hour, and then sinter the hot-pressed preform in a ceramic sintering furnace at a sintering temperature of 1100°C. The time is 4 hours, and a porous m...

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Abstract

The invention relates to a preparation method for an oxide fiber-reinforced oxide porous ceramic matrix composite. The method comprises the following steps: firstly, mixing an oxide ceramic precursorsolution, ceramic powder and sintering aid powder, thus obtaining ceramic slurry; brushing the slurry on an oxide fiber fabric surface, thus obtaining an oxide fiber prepreg; paving the prepreg, hot-pressing and sintering, thus obtaining a continuous fiber reinforced porous ceramic matrix composite. According to the preparation method, in order to prepare a porous matrix, the ceramic powder and the sintering aid powder with different grain sizes and sintering properties are mixed with the oxide ceramic precursor solution so as to obtain the slurry; when the porous matrix is formed, a frameworkof the porous matrix is formed by the large-size and hardly sintered ceramic powder; a continuous phase of the porous matrix is formed by the small-size and easily sintered ceramic powder; a bridgingfiber lap joint is formed between the framework of the porous matrix and the continuous phase of the porous matrix by the sintering aid powder; the sintering of the matrix is accelerated and the mechanical property of the porous matrix is guaranteed.

Description

technical field [0001] The invention relates to a preparation method of an oxide fiber reinforced oxide porous ceramic matrix composite material, which belongs to the technical field of composite material preparation. Background technique [0002] Oxide / oxide ceramic matrix composites refer to a class of materials that use oxide ceramics as a matrix and are composited with oxide fibers. This type of material has the characteristics of low density, high temperature resistance, and oxidation resistance. Compared with SiC-based composites, oxide / oxide ceramic-based composites have better environmental stability and lower cost, and the material has the potential to serve for a long time in a gas environment at 1000°C-1400°C (10 4 h). Oxide / oxide 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 comb...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/84C04B35/10C04B35/185C04B38/08
CPCC04B35/803C04B35/10C04B35/185C04B38/08C04B2235/3206C04B2235/3208C04B2235/3227C04B2235/3232C04B2235/3262C04B2235/3418C04B2235/48C04B2235/483C04B2235/5224
Inventor 杨瑞焦健杨金华焦春荣刘虎
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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