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Carbon fiber with Sibcn coating deposited on surface and preparation method thereof

A carbon fiber and coating technology, which is applied in the direction of carbon fiber, coating, fiber treatment, etc., can solve the problems of unsuitable industrial production of SiBCN and complicated process, and achieve good mixing uniformity, uniform coating structure, and gas source control process easy effect

Active Publication Date: 2016-04-13
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation of the above-mentioned SiBCN coating, two or more types of deposition gas sources are used, the process is relatively complicated, and most of the deposition reaction process produces corrosive by-products, which have no effect on the deposition substrate material and equipment, and Not suitable for industrial production of SiBCN

Method used

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  • Carbon fiber with Sibcn coating deposited on surface and preparation method thereof
  • Carbon fiber with Sibcn coating deposited on surface and preparation method thereof
  • Carbon fiber with Sibcn coating deposited on surface and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] Kind of like figure 1 , figure 2 The carbon fiber with SiBCN coating deposited on the surface of the present invention includes a carbon fiber matrix and a SiBCN coating deposited on the carbon fiber matrix. The SiBCN coating and the carbon fiber matrix are combined by mechanical engagement and chemical bonding. The SiBCN coating is boron azine And liquid polycarbosilane as raw materials are prepared by chemical vapor deposition process. In this embodiment, the carbon fiber matrix is ​​a carbon fiber monofilament, and the thickness of the SiBCN coating is 200 nm.

[0035] The method for preparing the carbon fiber with SiBCN coating deposited on the surface of this embodiment includes the following steps:

[0036] (1) The carbon fiber monofilament is ultrasonically cleaned in organic solvent acetone, and the time of ultrasonic cleaning is controlled to 1.0h;

[0037] (2) The carbon fiber monofilament after ultrasonic cleaning is dried and placed in the furnace of the deposit...

Embodiment 2

[0048] A carbon fiber with a SiBCN coating deposited on the surface of the present invention, comprising a carbon fiber matrix and a SiBCN coating deposited on the carbon fiber matrix. The SiBCN coating and the carbon fiber matrix are combined by mechanical and chemical bonding. The SiBCN coating is a boron azine And liquid polycarbosilane as raw materials are prepared by chemical vapor deposition process. In this embodiment, the carbon fiber matrix is ​​carbon fiber bundles, and the thickness of the SiBCN coating is 500 nm.

[0049] The method for preparing the carbon fiber with SiBCN coating deposited on the surface of this embodiment includes the following steps:

[0050] (1) Put the carbon fiber bundles in the organic solvent carbon tetrachloride for ultrasonic cleaning, and the ultrasonic cleaning time is controlled to 2.0h;

[0051] (2) The carbon fiber bundles after ultrasonic cleaning are dried and put into the furnace of the deposition furnace; the deposition furnace device...

Embodiment 3

[0058] A carbon fiber with SiBCN coating deposited on the surface of the present invention, comprising a carbon fiber matrix and a SiBCN coating deposited on the carbon fiber matrix. The SiBCN coating and the carbon fiber matrix are combined by mechanical engagement and chemical bonding. The SiBCN coating is a boron azine And liquid polycarbosilane as raw materials are prepared by chemical vapor deposition process. In this embodiment, the carbon fiber matrix is ​​a carbon fiber braid, and the thickness of the SiBCN coating is 800 nm.

[0059] The method for preparing the carbon fiber with SiBCN coating deposited on the surface of this embodiment includes the following steps:

[0060] (1) The carbon fiber braid is ultrasonically cleaned in a mixed solvent of acetone and carbon tetrachloride, and the ultrasonic cleaning time is controlled to 3.0h;

[0061] (2) Put the ultrasonically cleaned carbon fiber braid into the hearth of the deposition furnace; the deposition furnace device use...

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Abstract

The invention discloses carbon fiber provided with a SiBCN coating deposited on the surface. The carbon fiber comprises a carbon fiber matrix and the SiBCN coating deposited on the matrix, wherein the SiBCN coating and the carbon fiber matrix are combined through a mechanical meshing or chemical bonding mode, and the SiBCN coating is prepared from raw materials including borazine and liquid polycarbosilane with a CVD (chemical vapor deposition) process. A preparation method of the carbon fiber comprises the following steps: a carbon fiber matrix material is subjected to ultrasonic cleaning firstly, dried and placed in a hearth of a depositing furnace; air in the depositing furnace is replaced; carrier gas and diluent gas are introduced after the vacuum and temperature of the hearth of the depositing furnace reach set values, borazine and liquid polycarbosilane are carried in with a bubbling manner, are diluted by the diluent gas and then introduced into the depositing furnace; SiBCN resolved in the hearth is deposited gradually on the surface of the carbon fiber to form the SiBCN coating. A product has uniform and compact coating and good high-temperature stability, and the antioxidant ability of the carbon fiber can be improved remarkably.

Description

Technical field [0001] The invention belongs to the technical field of ceramic-based composite materials and their preparation, and in particular relates to a carbon fiber with a coating deposited on the surface and a preparation method thereof. Background technique [0002] The bulk density of carbon fiber reinforced ceramic matrix composites is usually less than 2.0g / cm 3 , Is only 1 / 2 of ceramic materials and 1 / 4 of nickel-based superalloys, and has excellent mechanical properties such as high modulus, high specific strength, and low thermal expansion coefficient, especially at ultra-high temperatures (up to 2200℃), Its strength does not drop but rises, which is higher than at room temperature. Therefore, carbon fiber reinforced ceramic matrix composite is an excellent high-temperature structural material. However, the carbon fiber and the interface phase in the composite material are easily oxidized at high temperature, which greatly limits its application under high temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/80D06M11/77C23C16/30D06M101/40
Inventor 李俊生程海峰周永江李斌斯永敏童思超孙逊
Owner NAT UNIV OF DEFENSE TECH
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