Continuous fiber reinforced high-entropy ceramic matrix composite material and preparation method thereof

A composite material and continuous fiber technology, which is applied in the field of continuous fiber reinforced high-entropy ceramic matrix composite materials and their preparation, can solve problems such as defect sensitivity, high brittleness, and limited engineering applications, and achieves low preparation temperature, simple equipment and process, and wide The effect of the application foreground

Active Publication Date: 2021-11-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, like other ceramic materials, its shortcomings such as high brittleness and defect sensitivity greatly limit its engineering applications.

Method used

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  • Continuous fiber reinforced high-entropy ceramic matrix composite material and preparation method thereof
  • Continuous fiber reinforced high-entropy ceramic matrix composite material and preparation method thereof
  • Continuous fiber reinforced high-entropy ceramic matrix composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for preparing continuous fiber reinforced high-entropy ceramic matrix composites:

[0037] For the preparation flow chart, see figure 1 ;

[0038] (1) Mix TiC, ZrC, HfC, NbC, and TaC in equal molar proportions by ball milling, and heat at 2000°C for 1 hour to obtain high-entropy ceramic powder (HEC); 258.6g high-entropy ceramic powder (HEC), 78.4g silicon carbide Ceramic powder (SiC), 50g deionized water, 2.5g polyethylene glycol (dispersant PEG), and 2g methylcellulose (binder MC) are mixed and put into a ball mill jar, and the speed is 400r on a planetary ball mill / min ball milling for 3 hours to obtain a uniformly dispersed HEC-SiC composite slurry.

[0039] (2) Put 120g of boric acid, 40g of urea, 40g of deionized water, and 40g of absolute ethanol into a ball mill jar after mixing, and ball mill for 3 hours on a planetary ball mill at a speed of 400r / min to obtain a uniformly dispersed boric acid / urea mixed solution.

[0040] (3) The continuous carbon ...

Embodiment 2

[0044] Same as Example 1, the difference is that the amount of high-entropy ceramic powder is 187.2g, and the amount of silicon carbide ceramic powder is 133.8g;

[0045] The porosity of the prepared high-entropy ceramic matrix composite is 10%, and the bending strength is 200MPa.

Embodiment 3

[0047] With embodiment 1, difference is that the layer thickness in step (4) is 0.5mm;

[0048] The porosity of the prepared high-entropy ceramic matrix composite is 15%, and the bending strength is 150Mpa.

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Abstract

The invention discloses a continuous fiber reinforced high-entropy ceramic matrix composite material and a preparation method thereof, and belongs to the technical field of composite material forming. The preparation method of the high-entropy ceramic-based composite material comprises the following steps: carrying out primary impregnation on a carbon fiber material in a boric acid/urea mixed solution, then carrying out heat treatment to obtain a carbon fiber material with a coating, coating the carbon fiber material with the coating with composite slurry, pressurizing, drying to obtain a high-entropy ceramic-based composite material green body, and carrying out secondary impregnation and cracking on the green body in the precursor solution to obtain the high-entropy ceramic-based composite material. According to the forming method, low-temperature and low-cost preparation of the high-entropy ceramic-based composite material is achieved.

Description

technical field [0001] The invention relates to the technical field of composite material molding, in particular to a continuous fiber reinforced high-entropy ceramic matrix composite material and a preparation method thereof. Background technique [0002] High-entropy ceramics are promising materials with great application prospects in the field of hypersonic vehicles. However, like other ceramic materials, their shortcomings such as high brittleness and defect sensitivity greatly limit their engineering applications. Therefore, it must be toughened to improve the reliability of the material. In recent decades, ceramic matrix composites represented by C / SiC have been extensively studied, providing an important reference for the preparation of high-entropy ceramic matrix composites. Among them, continuous fiber-reinforced ceramic matrix composites have the best toughening effect, which is an effective way to improve the toughness of high-entropy ceramics. Compared with C / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/56C04B35/622
CPCC04B35/80C04B35/5607C04B35/622C04B2235/96C04B2235/9607C04B2235/3826C04B2235/616
Inventor 何汝杰张路王文清董星杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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