sic f Interface Modification Methods of /sic Composite Materials

A composite material and modification technology, which is applied in the field of interface modification of SiCf/SiC composite materials, can solve the problems of adverse effects on material properties and strong interface bonding, and achieve the effects of shortening the preparation period, improving the interface bonding and reducing the porosity.

Active Publication Date: 2017-06-20
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used fiber-matrix interface has a SiC interface, but the SiC coating acts as a SiC f The fiber-matrix interface of SiC / SiC composites can also lead to strong interfacial bonding and adversely affect the material properties.

Method used

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  • sic <sub>f</sub> Interface Modification Methods of /sic Composite Materials
  • sic <sub>f</sub> Interface Modification Methods of /sic Composite Materials
  • sic <sub>f</sub> Interface Modification Methods of /sic Composite Materials

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Effect test

Embodiment 1

[0037] A kind of SiC of the present invention f The interface modification method of / SiC composite material comprises the following steps:

[0038] (1) The PyC coating was prepared on the surface of the SiC fiber in the SiC fiber preform by LPCVD (low pressure chemical vapor deposition). In the CVD deposition furnace, the chemical vapor deposition was carried out by the differential pressure method, the deposition temperature was 900 ° C, the deposition time was 5 h, the deposition pressure was 2000 Pa, and the flow rate of propylene was 200 L h -1 , the nitrogen flow rate is 100L·h -1 , to obtain a SiC fiber preform with PyC coating, that is, SiC f / PyC intermediates.

[0039] (2) SiC obtained in step (1) f / PyC intermediate placed in LPVCS (liquid polycarbosilane containing vinyl) impregnation solution, vacuum impregnated for 24h. Take out the vacuum-impregnated intermediate and put it into a graphite mold, and carry out cross-linking molding under a flowing nitrogen a...

Embodiment 2

[0044] A kind of SiC of the present invention f The interface modification method of / SiC composite material comprises the following steps:

[0045] (1) The h-BN coating was prepared on the surface of the SiC fiber in the SiC fiber preform by using the LPCVD process. The specific steps were: using boron trichloride and ammonia as the source gas, nitrogen and hydrogen as the dilution gas, and the silicon carbide fiber The braided piece is placed in a CVD deposition furnace, and the chemical vapor deposition is carried out by the differential pressure method. The deposition temperature is 700 ° C, the deposition time is 4 h, the deposition pressure is 1000 Pa, and the flow rate of boron trichloride is 0.6 L h -1 , the flow rate of ammonia gas is 1.8L·h -1 , the flow rate of hydrogen is 6L·h -1 , the nitrogen flow rate is 6L·h -1 , to obtain a SiC fiber preform with h-BN coating, that is, SiC f / h-BN intermediate.

[0046] (2) SiC in step (1) f / h-BN intermediate placed in ...

Embodiment 3

[0051] A kind of SiC of the present invention f The interface modification method of / SiC composite material comprises the following steps:

[0052] (1) The PyC coating was prepared on the surface of the SiC fiber in the SiC fiber preform by LPCVD process. The specific steps were as follows: using propylene as the source gas and nitrogen as the dilution gas, placing the silicon carbide fiber braid in the CVD deposition furnace, using Chemical vapor deposition was carried out by differential pressure method, the deposition temperature was 950 °C, the deposition time was 2 h, the deposition pressure was 3000 Pa, and the flow rate of propylene was 400 L h -1 , the nitrogen flow rate is 300L·h -1 , to obtain a SiC fiber preform with PyC coating, that is, SiC f / PyC intermediates.

[0053] (2) SiC obtained in step (1) by LPCVD process f / PyC intermediate surface to prepare h-BN coating, the specific steps are: using boron trichloride and ammonia as source gas, nitrogen and hydr...

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Abstract

The invention discloses an interface modification method of a SiCf / SiC composite material. The method comprises the following steps: 1, producing an interface coating layer on the SiC fiber surface of a SiC fiber preform; and 2, processing by adopting a hot die pressing assisted cross-linking PIP technology with the SiC fiber preform with the interface coating layer as a reinforcement and LPVCS as a precursor to produce an interface modified SiCf / SiC composite material. The interface modification method substantially improves the interface combination of fibers and a substrate in the composite material, improves the bending strength and the fracture toughness of the composite material, reduces the porosity of the material and shortens the preparation cycle of the composite material.

Description

technical field [0001] The invention relates to the field of silicon carbide-based composite materials, in particular to a SiC f Interface modification method of SiC / SiC composites. Background technique [0002] With the development of human science and technology, how to further improve the performance of structural materials has gradually become an important breakthrough to accelerate scientific and technological progress. Due to the fatal weaknesses of ceramic materials such as high brittleness, poor reliability, and high processing difficulty, it has seriously hindered its practical application as a structural material. Fiber-reinforced ceramic matrix composites can greatly improve the brittleness of single-phase ceramic materials, absorb energy through mechanisms such as crack deflection, fiber fracture, and fiber pull-out during the fracture process, and improve the strength and toughness of the material. Excellent properties such as strength, high specific modulus, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/622
Inventor 周新贵杨备余金山王洪磊柴宇新杨会永殷刘彦
Owner NAT UNIV OF DEFENSE TECH
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