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Preparation method of C/SiC-HfB2-HfC ultrahigh-temperature ceramic-based composite material

A technology of sic-hfb2-hfc and ultra-high temperature ceramics, which is applied in the field of preparation of C/SiC-HfB2-HfC ultra-high temperature ceramic matrix composites, can solve problems such as poor mechanical properties and poor thermal shock resistance of ceramics, and achieve Improve the effect of anti-ablation performance, good mechanical properties and high volume content

Inactive Publication Date: 2014-08-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

HfB 2 The high-temperature oxidation resistance of HfC and HfC ceramics can be proved from the text, but the ceramics prepared in this way have poor thermal shock resistance and poor mechanical properties

Method used

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  • Preparation method of C/SiC-HfB2-HfC ultrahigh-temperature ceramic-based composite material
  • Preparation method of C/SiC-HfB2-HfC ultrahigh-temperature ceramic-based composite material
  • Preparation method of C/SiC-HfB2-HfC ultrahigh-temperature ceramic-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Preparation of C / SiC-HfB using C / SiC preform 2 -HfC ultra-high temperature ceramic matrix composites

[0028] Concrete preparation steps are as follows:

[0029] 1. Preparation of composite material preform: The three-dimensional needle-punched C / SiC composite material preform with an open porosity of 35vol% was cleaned by ultrasonic waves for 1 hour, and dried in an oven at 100°C for 2 hours to obtain a C / SiC preform.

[0030] 2. Slurry preparation: Dissolve phenolic resin and hexamethylenetetramine in absolute ethanol, then add B 4 C powder and ball milled on a roller ball mill for 36 hours to obtain slurry; phenolic resin and B 4 The mass ratio of C powder is 2:1, the quality of hexamethylenetetramine is 10% of the phenolic resin quality; the viscosity of the slurry is controlled by the content of absolute ethanol to be 125mPa.s; the pH value is adjusted to 10 to control the dispersion .

[0031] 3. Vacuum pressure impregnation: Vacuum pressure impregn...

Embodiment 2

[0034] Example 2: Preparation of C / SiC-HfB using C / C preform 2 -HfC ultra-high temperature ceramic matrix composites

[0035] Concrete preparation steps are as follows:

[0036] 1. Preparation of composite material preform: The two-dimensional laminated C / C composite material preform with an open porosity of 25vol% was cleaned by ultrasonic waves for 1 hour, and dried in an oven at 120°C for 1 hour to obtain a C / C preform.

[0037] 2. Slurry preparation: Dissolve phenolic resin in absolute ethanol, then add B 4 C powder and ball milled on a roller ball mill for 48 hours to obtain slurry; phenolic resin and B 4 The mass ratio of C powder is 1:1, the quality of hexamethylenetetramine is 10% of the phenolic resin quality; the viscosity of the slurry is controlled by the content of absolute ethanol to be 150mPa.s; the pH value is adjusted to 10 to control the dispersion .

[0038] 3. Vacuum pressure impregnation: Vacuum pressure impregnation of the C / C preform in the slurry, t...

Embodiment 3

[0041] Example 3: Preparation of C / SiC-HfB using C / SiC preform 2 -HfC ultra-high temperature ceramic matrix composites

[0042] Concrete preparation steps are as follows:

[0043] 1. Preform preparation: The three-dimensional needle-punched C / SiC composite material preform with an open porosity of 30vol% was cleaned by ultrasonic waves for 1 hour, and dried in an oven at 120° C. for 1 hour to obtain a C / SiC preform.

[0044] 2. Slurry preparation: Dissolve furan resin in absolute ethanol, then add B 4 C and ball milled on a drum type ball mill for 48 hours to obtain slurry; phenolic resin and B 4 The mass ratio of C powder is 2:1, and the quality of hexamethylenetetramine is 10% of the furan resin quality; The viscosity of the slurry is controlled by the content of dehydrated alcohol to be 100mPa.s and measure the viscosity with a rotational viscometer, and adjust the pH A value of 9 controls dispersion.

[0045] 3. Vacuum pressure impregnation: vacuum pressure impregnate ...

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Abstract

The invention relates to a preparation method of a C / SiC-HfB2-HfC ultrahigh-temperature ceramics-based composite material. B4C and an organic precursor of C are introduced on a prefabricated body of a fiber reinforced composite material in a manner of vacuum pressure immersion method. A silicon-hafnium alloy is reacted with B4C and C to obtain SiC, HfB2 and HfC in situ with a reaction melt infiltration method. The material has good mechanical properties and contains various anti-ablation components. The obtained HfB2 and HfC are fine in grystal grains, are high in volume content and has effectively-improved anti-ablation performance. The material preparation method of the invention is suitable for a composite material. An HfC phase, a SiC phase and an HfB2 phase can be generated. The volume fraction of hafnium compound phases in a substrate is effectively increased and the anti-ablation performance at an ultrahigh-temperature environment of the material is improved.

Description

technical field [0001] The invention belongs to the preparation method of ultra-high temperature ceramic matrix composite material, in particular to a C / SiC-HfB 2 -The preparation method of HfC ultra-high temperature ceramic matrix composite material is a kind of using HfB 2 , HfC and SiC to modify the matrix of fiber-reinforced ceramic matrix composites for ablation resistance. Background technique [0002] Continuous fiber toughened silicon carbide matrix composite (C / SiC) is an ideal high-temperature structural material, which has a series of advantages such as high temperature resistance, low density, high strength, and thermal shock resistance, and is widely used in aviation and aerospace fields. prospect. Under oxidation conditions below 1700°C, the SiC matrix in the C / SiC composite material is passively oxidized, and SiO is formed on the surface of the material. 2 Protective layer, can be used for a long time. When re-entering the atmosphere and the high aerodynam...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/52C04B35/622
Inventor 王一光罗磊刘俊朋段刘阳张立同成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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