A continuous fiber reinforced high-entropy ceramic matrix composite material and its preparation method

A technology of composite materials and continuous fibers, applied in coatings, special surfaces, devices for coating liquids on surfaces, etc., can solve problems such as high brittleness, sensitivity to defects, and limited engineering applications, and achieve low preparation temperature and simple equipment process , the effect of broad application prospects

Active Publication Date: 2022-05-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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  • Claims
  • Application Information

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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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  • A continuous fiber reinforced high-entropy ceramic matrix composite material and its preparation method
  • A continuous fiber reinforced high-entropy ceramic matrix composite material and its preparation method
  • A continuous fiber reinforced high-entropy ceramic matrix composite material and its preparation method

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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, belonging to the technical field of composite material molding. The preparation method of the high-entropy ceramic matrix composite material comprises: once immersing the carbon fiber material in the boric acid / urea mixed solution, then performing heat treatment to obtain the carbon fiber material with coating, coating the composite slurry on the carbon fiber material with coating, adding Pressing and drying to obtain a high-entropy ceramic matrix composite material green body, and then immersing and cracking the green body in a precursor solution for a second time to obtain the high-entropy ceramic matrix composite material. The molding method of the invention realizes the low-temperature and low-cost preparation of the high-entropy ceramic matrix composite material.

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 Patents(China)
IPC IPC(8): B05D5/00C04B35/80C04B35/56C04B35/622
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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