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Preparation method of continuous oxide fiber reinforced oxide ceramic matrix composite

A technology for oxide ceramics and composite materials, which is applied in the field of preparation of continuous oxide fiber reinforced oxide ceramic matrix composite materials, can solve the problems of low content of sol ceramics, inability to perform, and difficult to store, and avoid the decrease of fiber strength or Powdering, flexible structural design, avoiding the effect of density gradients

Active Publication Date: 2021-02-09
AVIC BEIJING AERONAUTICAL MFG TECH RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the precursor prepared by the sol-gel method has strong acidity and alkalinity, which is easy to corrode fibers and equipment. Excessive acidity and alkalinity will even cause the fibers to be pulverized after impregnated with sol, which cannot play the role of strengthening and toughening.
In addition, the ceramic content of the sol is low, and repeated impregnation is required, and the stability of the sol is poor, easy to settle and precipitate, and difficult to store

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] (1) Preparation of slurry

[0023] Put the oxide ceramic powder, the oxide ceramic organic precursor solution, and the organic solvent in a ball mill pot according to the weight ratio and mix them uniformly, wherein the oxide ceramic powder is 40wt% to 80wt%, and the oxide ceramic organic precursor The solution is 10wt%-50wt%, the organic solvent is 10wt%-40wt%, and the organic slurry with evenly dispersed oxide ceramic powder is obtained;

[0024] (2) Preparation of continuous oxide fiber prepreg

[0025] Weave the continuous oxide fiber into a two-dimensional fabric, and then pre-cut the above-mentioned oxide fiber fabric of a certain size according to the component size requirements, and evenly paint the organic slurry prepared in step (1) on the oxide fiber fabric surface, and place the fiber fabric coated with the slurry in a vacuum oven for solvent removal treatment, and obtain the prepreg after the slurry on the surface of the fiber fabric is dried;

[0026] (3...

Embodiment 1

[0031] Put 60wt% of alumina powder, 20wt% of polyaluminoxane solution, and 20wt% of toluene solution in a certain proportion into a ball mill jar and mix them evenly to prepare alumina ceramic slurry. Apply the above organic slurry evenly on the surface of the pre-cut alumina fiber plain weave fabric produced by Mitsubishi Corporation of Japan, and place the fiber fabric coated with the slurry in a vacuum oven for solvent removal treatment, and wait for the surface slurry of the fiber fabric to dry Then the prepreg is obtained. The fiber volume fraction is controlled at 40%.

[0032] The above prepregs are placed in a metal mold to be stacked, and molded in a vacuum press, and then the molded preform is heat treated in a cracking furnace. The heat treatment temperature is 1150 ° C, and the heat treatment time is 2 hours. Finally, Low porosity ceramic matrix composite preform. Then the polyaluminoxane solution is used to carry out repeated impregnation-cracking process on the...

Embodiment 2

[0034] Put 50wt% of mullite powder, 15wt% of polyaluminoxane solution, 15wt% of vinyl silane solution, and 20wt% of chloroform solution into a ball mill tank according to a certain proportion and mix them uniformly to prepare mullite ceramic slurry . Apply the above organic slurry evenly on the surface of the pre-cut mullite fiber twill fabric produced by 3M Company in the United States, and place the fiber fabric coated with the slurry in a vacuum oven for solvent removal treatment. After drying, a prepreg is obtained. The fiber volume fraction is controlled at 42%.

[0035] The above prepregs are placed in a metal mold to be laminated, and molded in a vacuum press, and then the molded preform is heat treated in a cracking furnace. The heat treatment temperature is 1100 ° C, and the heat treatment time is 3 hours. Finally, Low porosity ceramic matrix composite preform. The polyaluminoxane solution and vinyl silane solution are mixed in proportion, and the preform is subjec...

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Abstract

The invention belongs to the preparation technology of continuous fiber reinforced ceramic matrix composite material, and relates to a preparation method of continuous oxide fiber reinforced oxide ceramic matrix composite material. The steps of this technology are: first, use the organic ceramic precursor solution as a solvent and ceramic powder to configure the slurry, then apply the slurry on the surface of the oxide fiber fabric to prepare the oxide fiber prepreg, and then pass the prepreg stacking The layer-molding-sintering process obtains a low-porosity ceramic matrix composite preform, and finally uses the organic ceramic precursor to repeatedly impregnate-crack the process to finally obtain a continuous fiber-reinforced ceramic matrix composite with ideal density. The present invention uses the organic ceramic precursor as a solvent to configure the ceramic slurry. The organic ceramic precursor can act as a binder for bonding the ceramic powder, and can also utilize the low-temperature inorganic characteristics of the organic ceramic precursor, so that it can be used in composite materials. During the preparation process, the fiber is protected from high temperature heat damage, and the strength of the composite material is improved.

Description

technical field [0001] The invention belongs to the preparation technology of continuous fiber reinforced ceramic matrix composite material, and relates to a preparation method of continuous oxide fiber reinforced oxide ceramic matrix composite material. Background technique [0002] Continuous fiber-reinforced composite materials have the characteristics of low density, high specific strength, high specific modulus, high temperature resistance, oxidation resistance, and good reliability. They are the development direction of high-performance aero-engine materials. Among them, ceramic matrix composite (CMC) is a structural material with high temperature (1650°C) and low density (2.5g / cm3~3.3g / cm3), which is expected to replace nickel with a density greater than 8.0g / cm3 The base or single crystal nickel alloy is used as the engine's combustion chamber, flame stabilizer, inner cone, tail nozzle, worm wheel outer ring, high-pressure turbine, low-pressure turbine and other comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/622
Inventor 梁艳媛王岭焦健李宝伟焦春荣
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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