Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF7 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Experimental program
Comparison scheme
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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com