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Fiber reinforcement and preparation method thereof

A fiber reinforcement and fiber weaving technology, which is applied in the field of fiber in-situ growth of multi-level SiC nanowire reinforcement and its preparation, can solve the problems of inability to microcrack branching, catastrophic failure of materials, and difficulty in size control. The effect of easy control of growth, simple preparation process and high safety

Active Publication Date: 2017-10-24
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

Generally, the size (nanoscale to micronscale) of randomly generated microcracks in the microdomain matrix is ​​difficult to control, and the SiC nanowires prepared by the above method cannot branch microcracks at different scales.
Therefore, the potential for catastrophic material failure remains
[0004] It can be seen that one-level SiC nanowires are not complete enough to improve the brittleness of ceramic micro-domains, and it is necessary to develop a multi-level SiC nanowire structure to improve the micro-domains of ceramic matrix composites.

Method used

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  • Fiber reinforcement and preparation method thereof
  • Fiber reinforcement and preparation method thereof
  • Fiber reinforcement and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] This example is to demonstrate the structure and morphology of the multi-level SiC nanowire reinforcement prepared by the "secondary catalyst method";

[0045] The carbon fiber braid was vacuum impregnated in 0.02 mol / L Ni(NO 3 ) 2 in acetone solution for 2h, remove and dry. Put the dry catalyst-loaded carbon fiber braid into the chemical vapor deposition equipment, raise the temperature to 700 ° C under the argon atmosphere, stop the argon, and pass in H 2 Ni(NO 3 ) 2 Reduced to Ni metal particles. stop h 2 Introduce, continue to heat up to 1100 ℃ by argon. 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 0.5h. After the reaction, the gas was turned off and cooled to room temperature under an argon atmosphere to obtain a first-grade SiC nanowire reinforcement. The obtained reinforcement was washed with ethanol and dried, and the above steps were re...

Embodiment 2

[0048] This example is to demonstrate the structure and morphology of the multi-level SiC nanowire reinforcement prepared by the "pressure adjustment method";

[0049] The SiC fiber braid was vacuum impregnated in a concentration of 0.01 Fe(NO 3 ) 3 in ethanol solution for 4h. Put the dry catalyst-loaded silicon carbide fiber braid into the chemical vapor deposition equipment, raise the temperature to 1000 ° C under nitrogen atmosphere, and pass H 2 Fe(NO 3 ) 3 Reduction to Fe metal particles. Stop aeration, pass into methyltrichlorosilane (MTS) and H 2 , and MTS / H 2 The mole fraction ratio is 0.2, the furnace pressure is 5KPa, the reaction is to be carried out for 40 minutes, the furnace pressure is changed to 100KPa, and the reaction is continued for 30 minutes. After the reaction, turn off the gas, and cool to room temperature under the protection of nitrogen atmosphere to obtain a multi-level SiC nanowire reinforcement, such as image 3 shown.

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Abstract

The invention relates to a fiber reinforcement and a preparation method thereof. The reinforcement is formed through in-situ growth of multi-stage SiC nano-wires on the surface of a fiber fabric body; the multi-stage SiC nano-wires comprise a sub-micron scale and a nano scale, wherein the sub-micron scale is 0.1mu m to 1mu m and the nano scale is 5nm to 100nm. The invention innovatively explores the preparation method of the multi-stage SiC nano-wire reinforcement through the in-situ growth on surfaces of fibers for the first time to obtain the needed multi-stage SiC nano-wire reinforcement. A preparation technology provided by the invention has the advantages of simple method, easiness for controlling the growth and high safety.

Description

technical field [0001] The invention belongs to the field of composite material preparation, and relates to a fiber-in-situ-grown multilevel SiC nanowire reinforcement and a preparation method thereof. Background technique [0002] In ceramic matrix composites, the composite material is strengthened and toughened by introducing micron-sized fibers into the ceramic matrix, and the tolerance of the ceramic matrix to damage is improved. However, for the micro-domain matrix between fiber bundles and layers, the matrix in the micro-domain still maintains inherent brittleness. During the service process, due to the thermal expansion coefficient mismatch between the fiber and the ceramic matrix, when the temperature of the service environment changes, a large number of microcracks will be generated in the brittle matrix of the micro-zone of the composite material, and the micron-sized fibers are not enough to resist the generated microcracks . Under the action of cyclic stress, t...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/565C04B35/52C04B35/622
CPCC04B35/52C04B35/565C04B35/62281C04B35/806C04B2235/5445C04B2235/5454
Inventor 董绍明秦浩胡建宝
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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