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A preparation method of c/c-sic composite material containing carbon-rich boron nitride interface phase

A carbon boron nitride boundary and composite material technology, applied in the field of fiber reinforced ceramic matrix composite material preparation, can solve the problems of poor BN interface uniformity, poor wettability of liquid silicon, etc., and achieves improved bonding, improved mechanical properties, improved efficiency and The effect of uniformity

Active Publication Date: 2021-11-19
HUNAN SHIXIN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wettability of BN to liquid silicon is poor, which will have a negative impact on the siliconization efficiency and the combination of the interface layer and the substrate, and the uniformity of the BN interface prepared by the traditional process is poor, so it is necessary to improve the traditional process

Method used

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  • A preparation method of c/c-sic composite material containing carbon-rich boron nitride interface phase
  • A preparation method of c/c-sic composite material containing carbon-rich boron nitride interface phase
  • A preparation method of c/c-sic composite material containing carbon-rich boron nitride interface phase

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Preparation of carbon-rich boron nitride interfacial phase

[0037] 1) Dissolve 40 g of boric acid and 120 g of urea in a mixed solvent of 400 ml of ethanol and water (V B: V water = 1:1), heat in a water bath at 80°C, and stir for 30 minutes to dissolve to obtain precursor solution A; in precursor solution A Add 10g of monomer acrylamide (AM) and 0.4g of cross-linking agent N,N'-methylenebisacrylamide (MBAM), stir to dissolve, cool down to 40°C and add 1.7856g of initiator ammonium persulfate (APS), Stir for 10min to initiate polymerization reaction to form sol solution B;

[0038] 2) Set the density to 0.55g / cm 3The 2.5D needle-punched integral felt was degummed at 800°C in an inert atmosphere in a vacuum carbon tube furnace, then immersed in sol solution B at 40°C for 20 minutes, taken out and dried at 80°C for 40 minutes, and repeated this treatment 4 times. After drying, the carbon felt is heat-treated under normal pressure in a nitrogen atmosphere to obtain a un...

Embodiment 2

[0042] Preparation of carbon-rich boron nitride interfacial phase

[0043] 1) Dissolve 40 g of boric acid and 120 g of urea in a mixed solvent of 400 ml of ethanol and water (V B: V water = 1:1), heat in a water bath at 80°C, and stir for 30 minutes to dissolve to obtain precursor solution A; in precursor solution A Add 15g of monomer acrylamide (AM) and 0.6g of cross-linking agent N,N'-methylenebisacrylamide (MBAM), stir to dissolve, cool down to 40°C and add 1.7856g of initiator ammonium persulfate (APS), Stir for 10min to initiate polymerization reaction to form sol solution B;

[0044] 2) The 2.5D needle-punched integral felt with a density of 0.55g / cm3 is degummed at 800°C under an inert atmosphere in a vacuum carbon tube furnace, then immersed in sol solution B at 40°C for 20 minutes, taken out and dried at 80°C for 40 minutes, Repeat this treatment 4 times, and heat-treat the carbon felt after repeated impregnation and drying treatment in a nitrogen atmosphere at norma...

Embodiment 3

[0046] Preparation of carbon-rich boron nitride interfacial phase

[0047] 1) Dissolve 40 g of boric acid and 120 g of urea in a mixed solvent of 400 ml of ethanol and water (V B: V water = 1:1), heat in a water bath at 80°C, and stir for 30 minutes to dissolve to obtain precursor solution A; in precursor solution A Add 5g of monomer acrylamide (AM) and 0.2g of cross-linking agent N,N'-methylenebisacrylamide (MBAM), stir to dissolve, cool down to 40°C and add 1.7856g of initiator ammonium persulfate (APS), Stir for 10min to initiate polymerization reaction to form sol solution B;

[0048] 2) The 2.5D needle-punched integral felt with a density of 0.55g / cm3 is degummed at 800°C under an inert atmosphere in a vacuum carbon tube furnace, then immersed in sol solution B at 40°C for 20 minutes, taken out and dried at 80°C for 40 minutes, Repeat this treatment 4 times, and heat-treat the carbon felt after repeated impregnation and drying treatment in a nitrogen atmosphere at normal...

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Abstract

The invention discloses a preparation method of a C / C-SiC composite material containing a carbon-rich boron nitride interface phase. The method is as follows: 1) Add AM and MBAM to the precursor solution A containing boric acid and urea to mix and dissolve, then add the initiator ammonium persulfate APS to initiate the polymerization reaction to form sol solution B; 2) immerse the carbon fiber preform in the sol solution In B, dry after impregnation, repeat impregnation, drying, and heat treatment to obtain a carbon fiber prefabricated part containing a carbon-rich boron nitride interface phase; layers of C / C‑SiC composites. The interfacial phase in the prepared material, on the one hand, can prevent liquid silicon from corroding fibers because there is no chemical reaction between BN and liquid silicon; Carbon can improve the wettability of the interface to silicon, thereby increasing the bonding strength between the interface and the matrix. The coupling of the two effects ultimately greatly improves the mechanical properties of the C / C‑SiC material.

Description

technical field [0001] The invention relates to a preparation method of a C / C-SiC composite material containing a carbon-rich boron nitride interface phase, and belongs to the technical field of preparation of fiber-reinforced ceramic matrix composite materials. Background technique [0002] Fiber-reinforced ceramic matrix composites consist of a ceramic or carbon matrix reinforced with continuous ceramic or carbon fibers, which offer greater resistance to high temperatures and corrosive environments than metals or other conventional engineering materials. Therefore, the material is significant as a thermal structural material, originally developed for military and aerospace applications. Now, they are being introduced into many other new fields, and their range of applications will grow when the cost of production is drastically reduced. Potential applications include structural components for heat exchangers, heat engines, gas turbines, aerospace industry, nuclear reactor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/628C04B35/573C04B35/524
CPCC04B35/524C04B35/573C04B35/62868C04B35/62886C04B35/83C04B2235/77C04B2235/96
Inventor 朱苏华
Owner HUNAN SHIXIN NEW MATERIALS CO LTD
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