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Method for preparing multi-level multi-scale fiber toughened ceramic matrix composite material

A fiber toughening and composite material technology is applied in the field of preparing fiber toughening ceramic matrix composite materials, which can solve the problems of difficulty in meeting the fatigue performance of engine materials, insufficient damage toughness, short fatigue life, etc., and achieves easy control and improved uniformity. , the effect of high controllability

Inactive Publication Date: 2019-10-22
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Continuous fiber-reinforced ceramic matrix composites, due to defects such as holes and cracks formed in the matrix during high-temperature use, lead to high material brittleness, insufficient damage toughness, and short fatigue life, which is difficult to meet the requirements of fatigue performance of next-generation engine materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The steps of the method for preparing multilevel and multiscale fiber-reinforced ceramic matrix composites are as follows:

[0037] Step 1. Evenly mix silicon carbide powder, phenolic resin, silicon powder and ethanol according to the mass fraction ratio of 1:3:1:5, and ball mill for 5 hours to obtain a slurry, which is ready for use;

[0038] Step 2: Using silicon carbide fiber fabric as a continuous fiber reinforcement, depositing a BN / SiC / PyC interface layer on the surface of the silicon carbide fiber fabric, the thickness of the single layer interface layer is about 400nm;

[0039] Step 3, Si powder and SiO 2 Powder is used as raw material, and nano-SiC fibers are grown in situ on the surface of continuous SiC fiber fabrics to prepare multi-level and multi-scale fibers. The reaction temperature for preparing nano-SiC fibers by in-situ gas phase reaction is 1450 °C;

[0040] Step 4: Apply the slurry prepared in Step 1 evenly to the multi-level and multi-scale fibers...

Embodiment 2

[0046] The steps of the method for preparing multilevel and multiscale fiber-reinforced ceramic matrix composites are as follows:

[0047] Step 1. Uniformly mix silicon carbide powder, phenolic resin, silicon powder and ethanol according to the mass fraction ratio of 1:2:1.5:7, and ball mill for 5 hours to obtain a slurry for use;

[0048] Step 2, using silicon carbide fiber fabric as a continuous fiber reinforcement, depositing a PyC / SiC / PyC interface layer on the surface of the silicon carbide fiber fabric, the thickness of the single layer interface layer is about 500nm;

[0049] Step 3: Prepare a mixed solution of absolute ethanol and polyethylene glycol according to the mass fraction ratio of 20:1, add nano-SiC fibers to the mixed solution, and disperse for 2 hours by ultrasonic vibration + mechanical stirring to obtain Nano silicon carbide fiber mixed solution;

[0050] Step 4. Apply the mixed solution obtained in Step 3 evenly on the surface of the continuous silicon c...

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Abstract

The invention relates to a method for preparing a multi-level multi-scale fiber toughened ceramic matrix composite material. The method comprises: depositing an interface layer on the surface of fiber, preparing a nanometer reinforcing body on the fiber surface having the interface layer to obtain multi-level multi-scale fiber, simultaneously preparing a mixed solution as a slurry, and introducingthe slurry into the multi-level multi-scale fiber through a wet prepreg preparation method to obtain a prepreg; cutting the prepreg, paving, and carrying out hot pressing molding to obtain a preform;carrying out high temperature carbonizing on the preform to obtain a porous body; and finally embedding the porous body with silicon powder, and carrying out melt siliconizing to obtain the multi-level multi-scale fiber toughened ceramic matrix composite material. According to the present invention, the multi-level multi-scale fiber toughened ceramic matrix composite material prepared by the method can achieve a density of 2.7 g / cm<3>, can control the porosity within 5%, and further has significantly improved bending strength and significantly improved fracture toughness.

Description

technical field [0001] The invention relates to a method for preparing multilevel and multiscale fiber-toughened ceramic matrix composite materials, belonging to the technical field of preparation of fiber-toughened ceramic matrix composite materials. Background technique [0002] Ceramic matrix composites refer to the introduction of dispersed phases into the ceramic matrix to form reinforcements, and the ceramic matrix is ​​a composite material of the continuous phase. It has good temperature resistance, low density, is insensitive to cracks, and will not cause catastrophic damage. Therefore, it has important applications in engine hot-end parts such as engine blades, brakes, high / low pressure turbine disks, flame stabilizers and exhaust nozzles, effectively improving the working efficiency of the engine. [0003] Continuous fiber-reinforced ceramic matrix composites, due to defects such as holes and cracks formed in the matrix during high-temperature use, lead to high mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/573C04B35/622C04B35/628
CPCC04B35/806C04B35/573C04B35/622C04B35/62863C04B35/62868C04B35/62873C04B2235/428C04B2235/5244C04B2235/5256C04B2235/616C04B2235/77
Inventor 姜卓钰焦健杨金华周怡然吕晓旭
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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