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Method for preparing C/SiC-HfC carbon fiber reinforced ultrahigh-temperature ceramic matrix composite

A technology of ultra-high temperature ceramics and composite materials, which is applied in the field of preparation of C/SiC-HfC carbon fiber reinforced ultra-high temperature ceramic matrix composites, can solve the problems of long preparation time, high material cost, and low volume fraction of HfC, and achieves high resistance to Ablation performance, improved ablation resistance, effect of increasing volume fraction

Inactive Publication Date: 2014-08-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume fraction of HfC in the material is too small, the preparation time is too long, the efficiency is low, the ability to resist long-term ablation is limited, and the cost of the material is too high

Method used

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  • Method for preparing C/SiC-HfC carbon fiber reinforced ultrahigh-temperature ceramic matrix composite
  • Method for preparing C/SiC-HfC carbon fiber reinforced ultrahigh-temperature ceramic matrix composite
  • Method for preparing C/SiC-HfC carbon fiber reinforced ultrahigh-temperature ceramic matrix composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Preparation of C / SiC-HfC ultra-high temperature ceramic matrix composites using C / C preforms

[0027] Concrete preparation steps are as follows:

[0028] 1. Preparation of composite material prefabricated body: A three-dimensional needle-punched C / C composite material prefabricated body with an open porosity of 30vol% was prepared by CVI process, ultrasonically cleaned for 1 hour, and dried in an oven at 120°C for 2 hours to obtain a C / C prefabricated body .

[0029] 2. Slurry preparation: Dissolve C organic precursor and hexamethylenetetramine in absolute ethanol, and ball mill for 24 to 48 hours to obtain slurry; the mass of hexamethylenetetramine is 10% of the mass of C organic precursor %; The viscosity of the slurry is controlled by the content of absolute ethanol to be 20-200mPa·s; the pH value is adjusted to 9-11;

[0030] 3. Vacuum pressure impregnation: vacuum pressure impregnate the composite material preform in step 1 into the slurry, the vacuum ...

Embodiment 2

[0033] Example 2: Preparation of C / SiC-HfC ultra-high temperature ceramic matrix composites using C / SiC preforms

[0034] Concrete preparation steps are as follows:

[0035] 1. Preparation of composite material preform: The three-dimensional punctured C / SiC composite material preform with an open porosity of 30vol% was ultrasonically cleaned for 1 hour, and dried in an oven at 120° C. for 2 hours to obtain a C / SiC preform.

[0036] 2. Slurry preparation: Dissolve silane resin and hexamethylenetetramine in absolute ethanol, and ball mill for 48 hours to obtain slurry; the quality of hexamethylenetetramine is 10% of the mass of silane resin; The viscosity of the content of the slurry is controlled to be 120mPa·s; the pH value is adjusted to 10 to control the dispersibility.

[0037] 3. Vacuum pressure impregnation: Vacuum pressure impregnation of the C / SiC preform in the slurry, the vacuum degree is -0.08MPa, and the pressure is 0.9MPa, so that the silane resin in the slurry is...

Embodiment 3

[0040] Example 3: Preparation of C / SiC-HfC ultra-high temperature ceramic matrix composites using C / SiC preforms

[0041] Concrete preparation steps are as follows:

[0042]1. Preparation of composite material preform: The three-dimensional punctured 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 120° C. for 2 hours to obtain a C / SiC preform.

[0043] 2. Slurry preparation: Dissolve phenolic resin and hexamethylenetetramine in absolute ethanol, and ball mill for 36 hours to obtain slurry; the quality of hexamethylenetetramine is 10% of the mass of phenolic resin; The viscosity of the slurry is controlled to be 150mPa·s; the pH value is adjusted to 11 to control the dispersibility.

[0044] 3. Vacuum pressure impregnation: Vacuum pressure impregnation of the C / SiC preform in the slurry, the vacuum degree is -0.10MPa, and the pressure is 1.0MPa, so that the phenolic resin in the slurry is imme...

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Abstract

The invention relates to a method for preparing C / SiC-HfC carbon fiber reinforced ultrahigh-temperature ceramic matrix composite, which comprises the following steps: introducing C organic precursor in C / SiC preform by vacuum pressure impregnation method or directly using C / C perform; combining with reaction melt impregnation method; and reacting silicon hafnium alloy with C to in-situ generate HfC-SiC. The obtained composite has high volume fraction of HfC; generated SiC and HfC have small grains to effectively improve the erosion resistance capability of materials. The method is applicable for composite, in site generates HfC phase in the process of preparing material and increases the volume fraction of hafnium compounds to enhance the erosion resistance capability.

Description

technical field [0001] The invention belongs to a preparation method of an ultra-high temperature ceramic matrix composite material, in particular to a preparation method of a C / SiC-HfC carbon fiber reinforced ultra-high temperature ceramic matrix composite material, which is a method for modifying the matrix of a fiber reinforced ceramic matrix composite material by using SiC and HfC sexual method. Background technique [0002] C / C composite materials have excellent properties such as low density, high specific strength, high specific modulus, ablation resistance, and erosion resistance. However, the oxidation resistance of C / C composites is poor, and it begins to oxidize in an oxidizing atmosphere exceeding 370 °C. Continuous fiber toughened silicon carbide composites (C / SiC) have the comprehensive advantages of C / C composites and SiC ceramics, and have a series of advantages such as high temperature resistance, low density, high strength, and thermal shock resistance. Th...

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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