Preparation method of continuous SiC fiber surface C/AIN composite gradient coating.

A gradient coating, fiber surface technology, applied in the direction of coating, fiber treatment, synthetic fiber, etc., can solve the problems of complex interface requirements and the inability of carbon coating to meet, and achieve the effect of improving longitudinal tensile strength and high temperature performance.

Inactive Publication Date: 2009-11-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problem that the general carbon coating cannot meet the complex requirements of the interface, the purpose of the present invention is to provide a method for preparing a C / AlN composite gradient coating on the surface of a continuous SiC fiber. SiC fiber with stable interfacial properties on titanium alloy matrix

Method used

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  • Preparation method of continuous SiC fiber surface C/AIN composite gradient coating.
  • Preparation method of continuous SiC fiber surface C/AIN composite gradient coating.
  • Preparation method of continuous SiC fiber surface C/AIN composite gradient coating.

Examples

Experimental program
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Effect test

Embodiment 1

[0035] In this example, SiC fibers produced by radio frequency heating chemical vapor deposition (the specification of SiC fibers are: length 300 meters, diameter 100 μm), acetylene is pyrolyzed and deposited at 920 ° C, and SiC with a length of 300 meters and a carbon-rich coating of 0.5 μm is prepared. fiber. The produced SiC fibers were wound on a sample holder and put into a vacuum chamber. When the vacuum degree of the vacuum chamber is 5×10 -4 At Pa, turn the sample holder to heat it, the heating temperature is 350°C, the heating rate is 6°C / min, and the temperature is kept for 1 hour. After the heat preservation is over, argon gas is introduced first, so that the partial pressure of the gas in the vacuum chamber is 3.1×10 -1 Pa, and then nitrogen gas is introduced. After the gases are fully mixed, the partial pressure ratio of argon and nitrogen is 1:0.66. Start the RF reactive sputtering power supply, control the output power at 340W, the sputtering time is 2 hours,...

Embodiment 2

[0039] In this example, SiC fibers produced by radio frequency heating chemical vapor deposition (the specification of SiC fibers are: length 280 meters, diameter 95 μm), acetylene is pyrolyzed and deposited at 1280 ° C, and SiC fibers with a length of 280 meters and a carbon-rich coating of 4 μm are prepared. . The produced SiC fibers were wound on a sample holder and put into a vacuum chamber. When the vacuum degree of the vacuum chamber is 8×10 -4At Pa, rotate the sample holder to heat it, the heating temperature is 550° C., the heating rate is 9° C. / min, and the temperature is kept for 3 hours. After the heat preservation is over, argon gas is introduced first, so that the partial pressure of the gas in the vacuum chamber is 5×10 -1 Pa, and then nitrogen gas, after the gas is fully mixed, the partial pressure ratio of argon and nitrogen is 1:1. Start the RF reactive sputtering power supply, control the target power at 350W, the sputtering time is 2 hours, the power freq...

Embodiment 3

[0042] In this example, SiC fibers produced by radio frequency heating chemical vapor deposition (the specifications of SiC fibers are: length 350 meters, diameter 105 μm), acetylene is pyrolyzed and deposited at 1000 ° C, and SiC with a length of 350 meters and a carbon-rich coating of 0.5 μm is prepared. fiber. The produced SiC fibers were wound on a sample holder and put into a vacuum chamber. When the vacuum degree of the vacuum chamber is 4×10 -4 At Pa, turn the sample holder to heat it, the heating temperature is 450° C., the heating rate is 8° C. / min, and the temperature is kept for 2 hours. After the heat preservation is over, argon gas is introduced first, so that the partial pressure of the gas in the vacuum chamber is 3×10 -1 Pa, and then nitrogen gas is introduced. After the gases are fully mixed, the partial pressure ratio of argon and nitrogen is 1:1.6. The RF reactive sputtering power supply was started, the target power was controlled at 390W, the sputtering...

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Abstract

The invention relates to a preparation technology of a composite material, in particular to a preparation method of a continuous SiC fiber surface C / AIN composite gradient coating. The preparation method comprises the following steps: first step, preparating SiC fibers of a carbon-enriched coating; second step, winding the produced SiC fibers on a sample support and then putting the sample support in a vacuum chamber of a magnetic control sputtering device; third step, rotating the sample support for heating and heat preservation when the vacuum degree of the vacuum chamber is superior to 1.0*10 Pa; fourth step, firstly pumping argon, then pumping nitrogen and fully mixing the gases after the heat preservation; and fifth step, starting a radio-frequency reaction sputtering power supply for sputtering, closing a gas path after the sputtering, keeping the vacuum degree superior to a vacuum degree below 1*10 Pa and cooling the sample support below 40 DEG C. The invention can solve the technical problem of unsatisfied interface complicated requirements by a common coating and can prepare the SiC fibers which have higher strength and stable interface performance with a titanium alloy basal body.

Description

Technical field: [0001] The invention relates to the preparation technology of composite materials, in particular to a preparation method of C / AlN composite gradient coating on the surface of continuous SiC fiber. Background technique: [0002] SiC fibers have the advantages of high specific strength, high specific modulus, corrosion resistance, wear resistance, and good thermal stability, and can be used as reinforcements for titanium-based materials (including titanium alloys and Ti-Al intermetallic compounds). Compared with matrix materials, SiC fiber reinforced titanium matrix composites have lower density, higher strength and stiffness, and can be applied at higher temperatures, so they are an important class of high-tech structural materials with clear applications in the aerospace industry prospect. [0003] In order to protect the fiber and improve the interfacial properties, most of the fibers are coated on their surface when they are prepared. The fiber surface c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/74D06M11/58C23C14/35C23C14/54C23C14/18C23C16/26C23C8/24D06M101/16
Inventor 肖鹏王玉敏雷家峰石南林杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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