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Cf/HfC-SiC ultrahigh temperature ceramic matrix composite material and preparation method thereof

A technology of ultra-high temperature ceramics and composite materials, applied in the field of ceramic matrix composite material preparation, can solve the problems of fiber/interface damage, metal residues, affecting the mechanical properties of composite materials, etc., achieve uniform filling, low silicon/carbon residues, and eliminate defects effect of influence

Inactive Publication Date: 2019-07-12
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under the control of infiltration kinetics, the newly formed products of metal melting reaction tend to coat the internal pore surface of the porous preform, resulting in large-scale metal residues in the prepared material; The interface causes damage, which seriously affects the mechanical properties of composite materials
These shortcomings limit the application of reactive infiltration in the preparation of high-performance ultra-high temperature ceramic matrix composites to a certain extent.

Method used

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  • Cf/HfC-SiC ultrahigh temperature ceramic matrix composite material and preparation method thereof
  • Cf/HfC-SiC ultrahigh temperature ceramic matrix composite material and preparation method thereof
  • Cf/HfC-SiC ultrahigh temperature ceramic matrix composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Carbon fiber preform treatment: PyC / SiC composite multilayer interface is deposited on the surface of the carbon fiber preform fiber by chemical vapor deposition, with a thickness of 500 nm. The open porosity of the obtained carbon fiber preform is 65 vol%;

[0040] (2) Preparation of HfC-C precursor solution: Dissolve hafnium tetrachloride in deionized water at a molar concentration of hafnium element 2mol / L, and then add sucrose in a ratio of 8:3 in the molar ratio of hafnium tetrachloride to sucrose (to make hafnium The ratio of the element to the carbon element is 1:4.5). After dissolution, add polyvinylpyrrolidone with a mass of 2wt% deionized water and stir for 6 hours until a uniform solution is formed to obtain a HfC-C precursor solution;

[0041] (3) Vacuum impregnation of HfC-C precursor solution: the precursor solution obtained in step (2) is introduced into the carbon fiber preform obtained in step (1) by vacuum impregnation, the vacuum degree is -0.08MPa, an...

Embodiment 2

[0047] The steps are similar to those in Example 1, except that the carbon fiber preform has a PyC / SiC interface layer with an interface thickness of ~1500 nm. The open porosity of the obtained carbon fiber preform was 56 vol%. In the precursor solution used, the hafnium source compound is hafnium oxychloride monohydrate, the carbon source compound is sucrose, and the molar ratio of the hafnium source compound to the carbon source compound is 2:1. C prepared in Example 2 f The volume ratio of the HfC-SiC phase in the HfC-SiC ultra-high temperature ceramic matrix composite is ~1:4, the open porosity is 6%, and the bending strength is 248MPa.

Embodiment 3

[0049] The steps are similar to those in Example 1, except that the interface of the carbon fiber preform is BN with a thickness of ~500nm. The open porosity of the obtained carbon fiber preform was 65 vol%. In the precursor solution used, the hafnium source compound is hafnium oxychloride monohydrate, the carbon source compound is sucrose, the stabilizer used is polyacrylic acid, the addition amount of stabilizer is 5wt% of the solvent mass, the pyrolysis temperature is 1000°C, and the time is 1 hour. C prepared in Example 3 f / HfC-SiC ultra-high temperature ceramic matrix composites, the volume ratio of HfC-SiC phase is ~1:2.5, the open porosity is 8%, and the bending strength is 203MPa.

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Abstract

The invention relates to a Cf / HfC-SiC ultrahigh temperature ceramic matrix composite material and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving a hafnium source compound, a carbon source compound and a stabilizer in a solvent to obtain a HfC-C precursor solution, wherein the hafnium source compound is a hafnium salt which can be thermally decomposed to obtain hafnium oxide; (2) introducing the HfC-C precursor solution to a carbon fiber preform by a vacuum impregnation process, and carrying out curing, cracking and carbothermal reduction treatment to obtain a Cf / HfC-C porous preform; and (3) repeating step (2) for at least one time, and carrying out reactive melt infiltration treatment on the Cf / HfC-C porous preform by using Si or HfSi2 to obtain the Cf / HfC-SiC ultrahigh temperature ceramic matrix composite material.

Description

Technical field [0001] The present invention relates to a C f / HfC-SiC ultra-high temperature ceramic matrix composite material and preparation method thereof belong to the technical field of ceramic matrix composite material preparation. Background technique [0002] Continuous fiber reinforced ultra-high temperature ceramic matrix composite materials (such as C f / ZrC-SiC, C f / HfC-SiC, C f / ZrB 2 -ZrC-SiC, etc.) overcome the inherent brittleness of ultra-high temperature ceramics, and have the advantages of light weight, extreme high temperature resistance, non-brittle fracture, oxidation and ablation resistance, and strong designability. It is considered as a thermal protection material for hypersonic aircraft and The most promising candidate material for heat protection components of a new generation of scramjet engines. [0003] The preparation methods of ultra-high temperature ceramic matrix composites mainly include Chemical Vapor Infiltration (CVI), Precursor Infiltration ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/56C04B35/565C04B35/622
CPCC04B35/806C04B35/5622C04B35/565C04B35/622C04B2235/5248C04B2235/616
Inventor 倪德伟姜佑霖董绍明阚艳梅高乐
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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