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Cf/C-MC ultra-high-temperature ceramic matrix composite and preparation method thereof

A technology of ultra-high temperature ceramics and composite materials, which is applied in the field of Cf/C-MC ultra-high temperature ceramic matrix composite materials and its preparation, can solve the problems of reduced mechanical properties of materials, long production cycle, carbon fiber damage, etc., and achieves low cost and synthesis. Faster and more efficient

Active Publication Date: 2015-04-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the above-mentioned preparation processes, the chemical vapor infiltration process has a relatively long production cycle and relatively high cost; most of the liquid precursors used in the precursor impregnation and cracking process are toxic; the high-temperature metal liquid in the reactive melt infiltration technology will cause damage to carbon fibers, resulting in material mechanical properties. reduce

Method used

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  • Cf/C-MC ultra-high-temperature ceramic matrix composite and preparation method thereof
  • Cf/C-MC ultra-high-temperature ceramic matrix composite and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] A preparation method of Cf / C-MC (M=Zr) ultra-high temperature ceramic matrix composite material, comprising the following steps:

[0026] 1) Chopped carbon felt is selected as the carbon fiber preform; glucose is used as the carbon source, and glucose solution A with a concentration of 50 g / L is prepared;

[0027] 2) Choose chemically pure ZrOCl 2 ·8H 2 O was dissolved in deionized water and placed in a constant temperature magnetic stirrer at 50 °C to fully stir, and the pH value was adjusted to 4 with a NaOH solution with a mass concentration of 20%, to prepare Zr 4+ The concentration is 0.5mol / L solution B;

[0028] 3) Put the carbon source solution A into the reaction kettle, and put the carbon fiber prefabricated body, put the reaction kettle into the homogeneous reactor to carry out the synthesis reaction, the temperature of the hydrothermal reaction is 180°C, and the reaction time is 6h; After cooling to room temperature, the carbon fiber preform was taken out...

Embodiment 2

[0033] A preparation method of Cf / C-MC (M=Zr) ultra-high temperature ceramic matrix composite material, comprising the following steps:

[0034] 1) Chopped carbon felt is selected as the carbon fiber preform; sucrose is used as the carbon source, and a sucrose solution A with a concentration of 80 g / L is prepared;

[0035] 2) Choose chemically pure ZrCl 4 Dissolved in deionized water and placed in a constant temperature magnetic stirrer at 50 ° C to fully stir, adjust the pH value to 6 with a NaOH solution with a mass concentration of 20%, and prepare Zr 4+ The concentration is 1mol / L;

[0036] 3) Put the carbon source solution A into the reaction kettle, and put the carbon fiber prefabricated body, put the reaction kettle into the homogeneous reactor to carry out the synthesis reaction, the temperature of the hydrothermal reaction is 190°C, and the reaction time is 5h; After cooling to room temperature, the carbon fiber preform was taken out and dried at 80° C. for 4 hours ...

Embodiment 3

[0043] A preparation method of Cf / C-MC (M=Zr) ultra-high temperature ceramic matrix composite material, comprising the following steps:

[0044] 1) Chopped carbon cloth is selected as the carbon fiber preform; starch is used as the carbon source to prepare starch solution A with a concentration of 70g / L;

[0045] 2) Use chemically pure ZrO(NO 3 ) 2 2H 2 O was dissolved in deionized water and placed in a constant temperature magnetic stirrer at 50 ° C to fully stir, and the pH value was adjusted to 8 with a NaOH solution with a mass concentration of 20%, to prepare Zr 4+ The concentration is 1.5mol / L solution B;

[0046] 3) Put the carbon source solution A into the reaction kettle, and put the carbon fiber prefabricated body, put the reaction kettle into the homogeneous reactor to carry out the synthesis reaction, the temperature of the hydrothermal reaction is 200°C, and the reaction time is 4h; After cooling to room temperature, the carbon fiber preform was taken out and ...

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Abstract

The invention provides a Cf / C-MC ultra-high-temperature ceramic matrix composite and a preparation method of the Cf / C-MC ultra-high-temperature ceramic matrix composite. The method includes the steps of selecting a carbon fiber prefabricated body as a reinforcement body, taking biomass carbon as a carbon source, conducting carbon microsphere sedimentation in the fiber prefabricated body through a homogeneous phase hydrothermal method, depositing oxides in the carbon fiber prefabricated body through the microwave hydrothermal method, repeatedly executing the carbon microsphere and oxide depositing step, and conducting calcination in the argon atmosphere to obtain the Cf / C-MC ultra-high-temperature ceramic matrix composite. According to the Cf / C-MC ultra-high-temperature ceramic matrix composite prepared through the method, the density ranges from 1.20 g / cm<3> to 2.05 g / cm<3>, and the porosity ranges from 6% to 13%. The method is easy to operate, short in preparation cycle and low in cost. No damage is caused to carbon fiber in the preparation process, and the method is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of preparation of ultra-high-temperature ceramic-based composite materials, and in particular relates to a Cf / C-MC ultra-high-temperature ceramic-based composite material and a preparation method thereof. Background technique [0002] Carbon fiber reinforced carbide (Cf / C-MC, M=Zr, Ta, Hf) ultra-high temperature ceramic matrix composites not only have the advantages of high melting point, high hardness, excellent thermal conductivity, etc., but also have good fracture toughness and heat resistance The shock performance makes it have broad application prospects in the application of materials in the ultra-high temperature field, such as aircraft nose cones, wing leading edges and engine throat linings and other thermal structural components. At present, the preparation methods of Cf / C-MC ultra-high temperature ceramic matrix composites mainly include chemical vapor infiltration process, precursor impregnation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/83C04B35/56C04B35/622
Inventor 李翠艳欧阳海波黄剑锋曹丽云费杰孔新刚卢靖
Owner SHAANXI UNIV OF SCI & TECH
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