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Preparation method of continuous oxide fiber reinforced oxide ceramic based 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: 2016-01-20
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 and mix them uniformly by weight, wherein the oxide ceramic powder is 40wt% to 80wt%, and the organic oxide ceramic precursor 10wt% to 50wt%, the organic solvent is 10wt% to 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) Preparation of low porosity ...

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 subject...

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Abstract

The invention belongs to the preparation technology of a continuous fiber reinforced ceramic based composite, and relates to a preparation method of a continuous oxide fiber reinforced oxide ceramic based composite. The technology comprises the steps that an organic ceramic precursor solution is utilized to serve as solvent to prepare slurry with ceramic powder, the slurry is smeared on the surface of oxide fiber fabric to prepare oxide fiber prepreg, the technological processes of laminating, mold pressing and sintering are conducted on the prepreg, a low-porosity ceramic based composite preform is obtained, the repeated processes of soaking and splitting are conducted by adopting an organic ceramic precursor, and the continuous fiber reinforced ceramic based composite with the ideal density is obtained. According to the preparation method of the continuous oxide fiber reinforced oxide ceramic based composite, the organic ceramic precursor is adopted to serve as the solvent to prepare the ceramic slurry, the organic ceramic precursor can play a role of bonder for bonding the ceramic powder, low-temperature inorganic characteristics of the organic ceramic precursor can be utilized, fiber is protected against thermal damage caused by high temperature in the composite preparation process, and the composite strength 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 kind of high temperature (1650 ℃) and low density (2.5g / cm 3 ~3.3g / cm 3 ), which is expected to replace the density greater than 8.0g / cm 3 High-quality nickel-based or single-crystal nickel alloys are used as engine combustion chambers, flame stabilizers, inner cones, tail nozzles, worm wheel outer rings, high-pressure turbines, low-pressure turbines and other comp...

Claims

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Application Information

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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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