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Method for preparing Cf/ZrC-SiC superhigh-temperature ceramic composite material through hot-pressing sintering/precursor cracking process

A technology for cracking ultra-high temperature ceramics and precursors, which is applied in the field of preparing Cf/ZrC-SiC ultra-high temperature ceramic composite materials by hot pressing sintering/precursor cracking method, which can solve the problem of high manufacturing cost, long preparation cycle and unsuitable for thick-walled parts And other issues

Active Publication Date: 2015-01-28
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: ① The matrix densification speed is low, the growth cycle is long (more than 100h), and the manufacturing cost is high; ② It is not suitable for the preparation of thick-walled parts; ③ The process equipment is complicated and the equipment investment is large
However, due to the low ceramic yield during the pyrolysis process of the polymer from the precursor to the ceramic state, more than ten impregnation-pyrolysis cycles are often required to meet the density and strength requirements of the material, and the preparation cycle is long.
In addition, the cost of the precursor is very high, resulting in a high cost of the material

Method used

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  • Method for preparing Cf/ZrC-SiC superhigh-temperature ceramic composite material through hot-pressing sintering/precursor cracking process
  • Method for preparing Cf/ZrC-SiC superhigh-temperature ceramic composite material through hot-pressing sintering/precursor cracking process
  • Method for preparing Cf/ZrC-SiC superhigh-temperature ceramic composite material through hot-pressing sintering/precursor cracking process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of preparation method of Cf / ZrC-SiC ultra-high temperature ceramic composite material, ZrSiC 2 The powder is introduced into the carbon fiber fabric, and ZrC and SiC ceramic substrates are generated in situ by hot pressing and sintering, and the final densification process is performed by precursor cracking method to obtain dense Cf / ZrC-SiC ultra-high temperature ceramic composite materials.

[0026] The concrete steps of this method are:

[0027] 1) ZrSi 2 Powder mixed in absolute ethanol, ZrSi 2 The massfraction of is 100g, and the massfraction of dehydrated alcohol is 100g, obtains slurry;

[0028] 2) Brush the slurry obtained in step 1) evenly on the surface of the cut carbon cloth, the quality of the carbon cloth and the slurry is 40g and 200g respectively;

[0029] 3) Stack the carbon cloth brushed with slurry in step 2), and place it in a graphite mold, then put the carbon cloth together with the graphite mold into a high-temperature hot-pressing sinter...

Embodiment 2

[0040]A kind of preparation method of Cf / ZrC-SiC ultra-high temperature ceramic composite material, ZrSiC 2 The powder is introduced into the carbon fiber fabric, and ZrC and SiC ceramic substrates are generated in situ by hot pressing and sintering, and the final densification process is performed by precursor cracking method to obtain dense Cf / ZrC-SiC ultra-high temperature ceramic composite materials.

[0041] The concrete steps of this method are:

[0042] 1) Mix ZrSi2 powder in absolute ethanol, ZrSi 2 The massfraction of is 60%, and the massfraction of dehydrated alcohol is 40%, obtains slurry;

[0043] 2) Brush the slurry obtained in step 1) evenly on the surface of the cut carbon cloth, the mass ratio of carbon cloth to slurry is 1:8;

[0044] 3) Stack up the carbon cloth brushed with slurry in step 2), and place it in a graphite mold, then put the carbon cloth together with the graphite mold into a high-temperature hot-pressing sintering furnace, and inert atmospher...

Embodiment 3

[0054] A kind of preparation method of Cf / ZrC-SiC ultra-high temperature ceramic composite material, ZrSiC 2 The powder is introduced into the carbon fiber fabric, and ZrC and SiC ceramic substrates are generated in situ by hot pressing and sintering, and the final densification process is performed by precursor cracking method to obtain dense Cf / ZrC-SiC ultra-high temperature ceramic composite materials.

[0055] The concrete steps of this method are:

[0056] 1) ZrSi 2 Powder mixed in absolute ethanol, ZrSi 2 The mass fraction of is 80%, and the mass fraction of dehydrated alcohol is 20%, obtains slurry;

[0057] 2) Brush the slurry obtained in step 1) evenly on the surface of the cut carbon cloth, the mass ratio of carbon cloth to slurry is 1:10;

[0058] 3) Stack up the carbon cloth brushed with slurry in step 2), and place it in a graphite mold, then put the carbon cloth together with the graphite mold into a high-temperature hot-pressing sintering furnace, and inert a...

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Abstract

The invention relates to a method for preparing a Cf / ZrC-SiC superhigh-temperature ceramic composite material through a hot-pressing sintering / precursor cracking process, and concretely relates to an in-situ preparation method for the Cf / ZrC-SiC superhigh-temperature ceramic composite material by combining a precursor cracking process and a hot-pressing sintering process. The method comprises: introducing ZrSi2 powder into carbon fiber fabric, employing the hot-pressing sintering process for in-situ generation of ZrC and SiC ceramic base bodies, and employing the precursor cracking process to perform final densification processing, so as to obtain the compact Cf / ZrC-Si superhigh-temperature ceramic composite material. The superhigh-temperature ceramic composite material prepared by employing the preparation method has excellent superhigh temperature usage performance, and the method is simple in process and short in time consumption. The obtained Cf / ZrC-SiC superhigh-temperature ceramic composite material can basically satisfy practical application of some heatproof structural members, and has wide application prospect in extreme environments such as super hypersonic speed flight, aerosphere reentry, trans-atmospheric flight, rocket propulsion system and the like.

Description

technical field [0001] The invention relates to a method for preparing Cf / ZrC-SiC ultra-high temperature ceramic composite material by hot pressing sintering / precursor cracking method, specifically preparing Cf / ZrC-SiC ultra-high temperature ceramics in situ by using precursor cracking method combined with hot pressing sintering method Composite approach. Background technique [0002] Carbon fiber reinforced ceramic matrix composites are a kind of thermal structural materials with high temperature resistance, low density and high strength and toughness. They combine the superior mechanical properties of fiber reinforcements and good chemical and thermal stability of ceramic matrix. , Excellent thermophysical properties, ablation resistance and high dynamic and static friction and wear properties, etc., can be prepared into engineering components with complex shapes. At present, the methods used to prepare continuous carbon fiber reinforced ceramic matrix composites at home ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/565C04B35/56C04B35/622
Inventor 孙新冯志海周延春李军平赵彦伟胡继东
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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