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A preparation method for in-situ growth of silicon carbide nanofibers and carbon fiber co-reinforced ceramic matrix composites

A technology of in-situ growth of nanofibers, which is applied in the field of ceramic matrix composites, can solve the problems of low purity of silicon carbide nanofibers, achieve the effects of improving strength, toughness and high temperature environment stability, simple equipment, and increasing resistance to crack propagation

Inactive Publication Date: 2018-05-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Specifically, the present invention uses a carbon / carbon porous material with silicon carbide nanofibers grown in situ as a prefabricated body, and prepares a ceramic matrix composite material reinforced by nanofibers synergistically with carbon fibers by infiltration above the melting point of silicon. The technical defect that the purity of catalyst growth silicon carbide nanofiber is not high, the present invention utilizes silicon powder and silicon dioxide mixed powder as reaction source material, wherein the carbon source that generates silicon carbide nanofiber comes from carbon / carbon porous material Carbon matrix, silicon source from mixed powder in graphite crucible

Method used

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  • A preparation method for in-situ growth of silicon carbide nanofibers and carbon fiber co-reinforced ceramic matrix composites
  • A preparation method for in-situ growth of silicon carbide nanofibers and carbon fiber co-reinforced ceramic matrix composites
  • A preparation method for in-situ growth of silicon carbide nanofibers and carbon fiber co-reinforced ceramic matrix composites

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Experimental program
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Effect test

Embodiment 1

[0037] A method for preparing in-situ growth of silicon carbide nanofibers synergistically with carbon fiber co-increased ceramic matrix composites, comprising the following steps:

[0038] a) Weigh 75g of silicon powder and 100g of silicon dioxide powder (purity: 99.9%), uniformly mix through high-energy ball milling to make a fine powder slurry, evaporate and dry the slurry on a rotary evaporator, and then grind to obtain a mixed powder material.

[0039] b) Weigh 100g of the mixed powder obtained in step a, place it on the bottom of the graphite crucible, place a porous graphite support at the middle end of the crucible, then place 50g of carbon / carbon porous material on the porous graphite support, and finally take A graphite lid covers the graphite crucible.

[0040] c) Place the device in step b in a tube furnace, first evacuate it to within 10Pa, then fill it with high-purity argon (purity ≥ 99.99%; oxygen content ≤ 10PPM) at a flow rate of 15cc / min, with 10 The heati...

Embodiment 2

[0045] The difference between this embodiment and embodiment 1 is that in step c, when heating to 1500° C., the holding time is 40 minutes, and other steps and test parameters are the same.

Embodiment 3

[0047] The difference between this embodiment and embodiment 1 is that in step c, when heating to 1600° C., the holding time is 40 minutes, and other steps and test parameters are the same.

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Abstract

The invention discloses a preparation method for in-situ growth silicon carbide nanofiber cooperated with a carbon fiber co-addition ceramic matrix composite material. A carbon / carbon porous material of the in-situ growth silicon carbide nanofiber is used as a prefabricated body, silica particle embedding is performed, and the material is prepared through a liquid phase silicon infiltration reaction above a melting point. By adopting the nanometer silicon carbide fiber cooperated with the carbon fiber co-addition ceramic matrix composite material, silicon carbide nanofiber and carbon fiber are organically combined through in-situ growth of silicon carbide nanofiber, and multiscale toughening is formed, so that the multi-scale compounding effect is brought into play, structural defects of materials are reduced, and the crack propagation resistance is enlarged, and therefore the strength and toughness and the high-temperature environment stability of the material are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of ceramic matrix composite materials, in particular to the preparation of continuous fiber reinforced ceramic matrix composite materials. Background technique [0002] Continuous carbon fiber reinforced silicon carbide ceramic matrix (C / SiC) composites not only have a series of excellent properties such as light weight, high temperature resistance, high specific strength, high specific modulus, and low thermal expansion coefficient, but also have high matrix density and heat resistance. It is a new lightweight composite material that integrates structural load-bearing and oxidation / ablation resistance. In recent years, it has been highly concerned by domestic and foreign counterparts in the field of aerospace. [0003] At present, for the preparation of such materials, mainly micron-scale carbon fibers are used, which are combined with the matrix in a certain way through the interface to form a ceramic mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/65
CPCC04B35/573C04B35/65C04B35/806C04B2235/5244C04B2235/5248C04B2235/96
Inventor 代吉祥沙建军邵俊琦吕钊钊张兆甫
Owner DALIAN UNIV OF TECH
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