Method used for limiting composite material matrix internal crack expansion

A composite material and internal crack technology, which is applied in the field of limiting the internal crack propagation of the composite material matrix, can solve the problems of poor damage resistance of the composite material matrix, weakening the enhancement efficiency of SiC nanowires, and uneven distribution of SiC nanowires, and achieves feasibility. High, controllable growth effect

Inactive Publication Date: 2019-01-22
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, for the above method, the distribution of SiC nanowires obtained is not uniform, and they are partially or slightly distributed in the matrix, and for the latter, the nanowires under no interface protection are strongly bonded to the matrix, which weakens the enhancement efficiency of SiC nanowires
Therefore, there is still the problem of poor damage resistance of the composite matrix.

Method used

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  • Method used for limiting composite material matrix internal crack expansion
  • Method used for limiting composite material matrix internal crack expansion
  • Method used for limiting composite material matrix internal crack expansion

Examples

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Effect test

Embodiment 1

[0045] The carbon fiber preform was vacuum impregnated in 0.5 mol / L Ni(NO 3 ) 2 in acetone solution for 10h, take out and dry. Put the dry catalyst-loaded carbon fiber braid into a chemical vapor deposition device, and raise the temperature to 1200° C. under an argon atmosphere. Close the argon, pass through methyltrichlorosilane (MTS) and H 2 ,MTS / H 2 The mole fraction ratio is 0.1, the furnace pressure is 3KPa, and the reaction time is 1h, and the SiC nanowire reinforcement is obtained. Close MTS and H 2 , pass in argon, after the temperature drops to 1000°C, turn off the argon, and pass in CH 4 The gas provides the carbon source, the furnace pressure is 3KPa, and the reaction time is 2h. After the reaction, the gas was turned off, and the SiCNWs / PyC reinforcement was obtained by cooling to room temperature under the protection of an argon atmosphere. The SiC matrix was prepared by the CVI process to realize the densification of the composite material, with MTS as the...

Embodiment 2

[0050] Access to CH 4 The reaction time of the gas was 4h, and the thickness (200nm) of the layered PyC interface was increased. Others were the same as in Example 1. As a result, a SiCNWs / PyC synergistically reinforced composite material was obtained.

[0051] Image 6 Comparing the optical macroscopic morphology of the SiCNWs / PyC synergistically reinforced composite material prepared for this example without external force and with 180MPa external force, it was found that the composite material did not change after the external force was applied.

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Abstract

The invention relates to a method used for limiting composite material matrix internal crack expansion. The method comprises following steps: 1, chemical vapor deposition is adopted for preparation ofa layered PyC interface on the surface of a fiber prefab with surface in-suit growth of SiC nanometer wire so as to obtain a SiCNWs/PyC fiber prefab; 2, at least one method selected from chemical vapor infiltration CVI, precursor infiltration pyrolysis PIP, and reactive melt infiltration RMI is adopted for filling of a ceramic matrix in the SiCNWs/PyC fiber prefab so as to obtain the SiCNWs/PyC synergetically enhanced ceramic based composite material; wherein the ceramic matrix is at least one selected from SiC, Si-C-N, and Si-B-C-N.

Description

technical field [0001] The invention relates to a method for limiting crack propagation inside a matrix of a composite material, in particular to a method for enhancing the damage resistance of a composite material by using SiCNWs / PyC reinforcement, and belongs to the field of fiber-reinforced ceramic matrix composite materials. Background technique [0002] In composite materials, the toughness of composite materials is improved by introducing micron-sized fibers into the matrix, and the tolerance of the matrix to damage is improved. Due to the thermal expansion coefficient mismatch between the fiber and matrix of ceramic matrix composites, when the service temperature is higher or lower than the preparation temperature, a large number of microcracks are generated in the composite matrix. Since the size of these microcracks is much smaller than the diameter of the fibers, the fibers are not sufficient to consume the cracks. Under the action of external force, these externa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/58C04B35/84C04B35/628
CPCC04B35/806C04B35/565C04B35/58C04B35/62844C04B35/62884C04B2235/5244C04B2235/5248
Inventor 秦浩胡建宝董绍明何平阚艳梅杨金山
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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