A kind of fiber reinforced mullite ceramic matrix composite material and preparation method thereof

A fiber-reinforced and composite material technology is applied in the field of fiber-reinforced mullite ceramic matrix composite materials and its preparation, which can solve the problems of large preparation cost and cycle, high preparation cost and low solid content of composite materials, and achieves the advantage of low cost , large solid content, excellent performance

Active Publication Date: 2022-01-28
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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Problems solved by technology

[0005] In addition, when preparing the mullite ceramic matrix, the prior art generally uses mullite sol or precursor, but the preparation cost of mullite sol or precursor with excellent performance is relatively high, and the solid content is low. The solid content of phase sol and dual-phase sol is generally lower than 20%, which leads to a large cost and cycle of composite material preparation, which restricts the application of fiber-reinforced mullite ceramic matrix composites in the civil field

Method used

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  • A kind of fiber reinforced mullite ceramic matrix composite material and preparation method thereof

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preparation example Construction

[0034] The present invention provides a method of preparing a fiber reinforced mullite ceramic matrix composite material in a first aspect. The preparation method improves the existing PIP process, thereby making the preparation method with low cost and easy advantages. First, the preparation method provided by the present invention is used to impregnate the silica sol and nano aluminum oxide powder into an impregnated precursor, which has significant low cost compared to single-phase or double phase mockliol. Advantage, and a mixture of solid content (Mullioli is a mixture of silica sol and aluminum sol, and its solid content is generally less than 20 wt%, and the aluminum sol price is higher, but the price of alumina powder is low). Since the ratio of alumina and silicon oxide in the component can be easily regulated, this facilitates the control of the composite matrix components, thereby ensuring a mullite ceramic component. Further, since the impregnation material of such a n...

Embodiment 1

[0069] refer to figure 1First, first, the particle diameter fractionation is less than 100 nm of powder accounts for 80%, 100 nm-200 nm powder accounts for 80%, which is 15% of the oxide powder, which is 15% of the oxide powder, which is 15%, is 15% acidic. In a silica sol, there is a molar ratio of alumina and silicon oxide of 3: 2, and 1% polyethylene glycol is added as a dispersant, passed through the ball milling for 20%, 5 MPa · S and a stable impregnation front drive. body. Then, the alumina fiber cloth layer was placed in a vacuum impregnation apparatus, and after 0.09 MPa evacuated, the slurry injection, the slurry did not fibrous cloth layer, and the vacuum was allowed to be exhausted. Subsequently, the wet cloth layer was taken out from the apparatus, which was superimposed on the plate and dried by a vacuum bag and dried at 0.1 MPa and 40 ° C; secondly, the molded block was sintered at 1000 ° C for 0.5 h. Finally, the fiber reinforcing composite is multi-impregnated-dry...

Embodiment 2

[0071] First, the particle cassette is divided into a powder of 15%, 100 nm to 200 nm, which is 80%, greater than 200 nm, which is more than 200 nm, is dispersed to a solid content of 20% acidic silicon. In the sol, there is a molar ratio of alumina and silicon oxide of 3: 2, and 1% polyethylene glycol is added as a dispersant, and the solid content is 20%, 5 MPa · S and a stable impregnation precursor. . Then, the silicon oxide fiber cloth layer was placed in a vacuum impregnation apparatus, and after 0.09 MPa evacuated, the slurry injection, the slurry did not fibrilize layers, and the vacuum was allowed to be exhausted. Subsequently, the wet cloth layer was taken out from the apparatus, which was superimposed on the plate and dried by a vacuum bag and dried at 0.1 MPa and 40 ° C; secondly, the molded block was sintered at 1000 ° C for 0.5 h. Finally, the fiber reinforcing composite is multi-impregnated-dry-sintering, so that the ceramic density reaches 60% of theoretical densit...

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Abstract

The invention relates to a fiber-reinforced mullite ceramic matrix composite material and a preparation method thereof. The preparation method includes the following steps: (1) the step of preparing an impregnating precursor: mixing alumina powder, silica sol and a dispersant, and ball-milling to obtain an impregnating precursor; the silica sol has a solid content of 15-30wt% Acidic silica sol; the particle size gradation of the alumina powder is as follows: the powder smaller than 100nm accounts for 5-15wt%, the powder with 100nm-200nm accounts for 70-80wt%, and the powder larger than 200nm accounts for 5-15wt% ; The molar ratio of the alumina in the alumina powder and the silica in the silica sol is 3:2-4:2; (2) the step of vacuum impregnation; (3) the step of drying; (4) the step of sintering; and (5) the step of densification. The preparation method has lower requirements on the weaving of fibers and lower cost, and can obtain a mullite ceramic matrix composite material with excellent performance.

Description

Technical field [0001] The present invention relates to the field of fiber reinforced ceramic matrix composite materials, and more particularly to a fiber reinforced mullite ceramic matrix composite material and a preparation method thereof. Background technique [0002] The fiber reinforced ceramic base composite has excellent thermal properties and mechanical properties. Europe, Germany, Europe, America, have the preparation techniques of such composites and use such composites for aerospace engine combustion chambers, tail nozzle thermal components, aircraft thermal protection structural parts. However, in the country, the composite technology has slowed slowly, and there is no mature manufacturing process, and there are even many technical details fail to break through. [0003] The fiber reinforced mullite ceramic matrix composite is a composite material with a mullite ceramic as a substrate as a reinforcing body. Mullite (3Al) 2 O 3 2SIO 2 Ceramics have good chemical and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/185C04B35/622
CPCC04B35/185C04B35/622C04B2235/5256C04B2235/5224C04B2235/3217C04B2235/3418C04B2235/96C04B2235/5228
Inventor 孙志强张剑吕毅吴涛慈吉良
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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