a c f - Preparation method of hfcnw micro-nano multi-scale toughened carbon matrix composites

A cf-hfcnw, composite material technology, applied in the field of preparation of strong and tough carbon-based composite materials, can solve the problems of high requirements for process equipment, complicated preparation process, and long cycle

Active Publication Date: 2020-10-27
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this method is relatively complicated, the cycle is long, and the requirements for process equipment are high.

Method used

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  • a c <sub>f</sub> - Preparation method of hfcnw micro-nano multi-scale toughened carbon matrix composites
  • a c <sub>f</sub> - Preparation method of hfcnw micro-nano multi-scale toughened carbon matrix composites
  • a c <sub>f</sub> - Preparation method of hfcnw micro-nano multi-scale toughened carbon matrix composites

Examples

Experimental program
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Effect test

Embodiment 1

[0035] 1) Prepare an ethanol solution with a molar concentration of 0.2mol / L nickel nitrate, and use a glass rod to stir until the nickel nitrate is completely dissolved at room temperature, in order to obtain a uniform mixed solution;

[0036] 2) Set the density to 0.8g / cm 3 The low-density C / C composite material was cleaned, soaked in the ethanol solution of nickel nitrate described in step 1 for 12 hours, and then taken out and dried in an oven at 50°C for later use.

[0037] 3) Put the low-density C / C composite material containing nickel nitrate obtained in step 2 into a tube furnace, and pass through H at 500°C 2 A low-density C / C composite material preform containing catalyst Ni is obtained through reduction.

[0038] 4) Weigh an appropriate amount of HfC precursor PHC and divinylbenzene in a beaker with a mass fraction of 1:10, heat and stir with a magnetic stirrer at room temperature for 3 hours, so that the HfC precursor PHC is fully dissolved in the divinylbenzene s...

Embodiment 2

[0042] 1) Prepare an ethanol solution with a molar concentration of 0.5mol / L nickel nitrate, and use a glass rod to stir until the nickel nitrate is completely dissolved at room temperature, in order to obtain a uniform mixed solution;

[0043] 2) Set the density to 0.8g / cm 3 The low-density C / C composite material was cleaned, soaked in the ethanol solution of nickel nitrate described in step 1 for 12 hours, and then taken out and dried in an oven at 50°C for later use.

[0044] 3) Put the low-density C / C composite material containing nickel nitrate obtained in step 2 into a tube furnace, and pass through H at 500°C 2 A low-density C / C composite material preform containing catalyst Ni is obtained through reduction.

[0045] 4) Weigh an appropriate amount of HfC precursor PHC and divinylbenzene in a beaker with a mass fraction of 3:10, heat and stir with a magnetic stirrer at room temperature for 3 hours, so that the HfC precursor PHC is fully dissolved in the divinylbenzene s...

Embodiment 3

[0049] 1) Prepare an ethanol solution with a molar concentration of 1mol / L nickel nitrate, and use a glass rod to stir until the nickel nitrate is completely dissolved at room temperature, in order to obtain a uniform mixed solution;

[0050] 2) Set the density to 0.8g / cm 3 The low-density C / C composite material was cleaned, soaked in the ethanol solution of nickel nitrate described in step 1 for 12 hours, and then taken out and dried in an oven at 50°C for later use.

[0051] 3) Put the low-density C / C composite material containing nickel nitrate obtained in step 2 into a tube furnace, and pass through H at 500°C 2 A low-density C / C composite material preform containing catalyst Ni is obtained through reduction.

[0052] 4) Weigh an appropriate amount of HfC precursor PHC and divinylbenzene in a beaker with a mass fraction of 5:10, heat and stir with a magnetic stirrer at room temperature for 3 hours, so that the HfC precursor PHC is fully dissolved in the divinylbenzene sol...

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Abstract

The invention relates to a preparation method of a Cf-HfCnw micronano multiscale toughened carbon matrix composite. The preparation method comprises the following steps: soaking a low-density C / C composite with the density of 0.7-1.0 g / cm<3> in a nickel nitrate ethanol solution, wherein generation of unnecessary change of state is avoided in the drying process; adding a 0.01-1% peroxide as an initiator to initiate the cross-linked polymerization of a precursor PHC and divinyl benzene; and successively preparing an HfC nanowire on the surface of the low-density C / C composite by adopting a precursor conversion method to realize the toughing of the carbon matrix composite on the micronano scale to obtain the Cf-HfCnw micronano multiscale toughened carbon matrix composite. The large-scale in-situ growth of the HfC nanowire on the surface of the low-density C / C composite is realized, and the effectively control to the appearance and the purity of the HfC nanowire can be realized.

Description

technical field [0001] The invention belongs to a preparation method of a strong and tough carbon-based composite material, and relates to a C f - Preparation method of HfCnw micro-nano multi-scale toughened carbon-based composite material. Background technique [0002] C / C composite material is carbon fiber and its fabric reinforced carbon matrix material, which has low density, high specific strength and specific modulus, good fracture toughness, small thermal expansion coefficient, high temperature resistance, ablation resistance, thermal shock resistance and stable chemical properties, etc. A series of excellent properties, especially at high temperatures, its strength does not decrease but increases with temperature, making it an incomparable advantage as a high-temperature thermal protection structural material in the aerospace field. However, C / C composites inherit the characteristics of carbon materials that are easily oxidized in high-temperature aerobic environmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/52C04B35/622
CPCC04B35/52C04B35/622C04B35/83C04B2235/405C04B2235/6562C04B2235/6567C04B2235/77
Inventor 张雨雷付艳芹赵志刚任金翠
Owner NORTHWESTERN POLYTECHNICAL UNIV
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