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A method of preparing pyrolytic carbon interface coatings using ethanol as a precursor

A technology of interface coating and pyrolytic carbon, which is applied in the field of silicon carbide fiber reinforced silicon carbide composite material interface coating preparation, can solve the problems of high cost, slow deposition rate, and difficult texture shape, and achieve low cost and high deposition rate. Fast, simple and controllable preparation process

Active Publication Date: 2021-07-20
BEIHANG UNIV
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Problems solved by technology

[0005] For SiC f / SiC composite material strengthening and toughening technical problems, in order to overcome the disadvantages of slow deposition rate, high cost, and difficult control of texture shape in the process of preparing PyC coating on the surface of SiC fiber by existing methods, and at the same time realize the deposition on the surface of SiC fiber Uniform PyC interface coating with controllable thickness and texture morphology

Method used

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  • A method of preparing pyrolytic carbon interface coatings using ethanol as a precursor
  • A method of preparing pyrolytic carbon interface coatings using ethanol as a precursor
  • A method of preparing pyrolytic carbon interface coatings using ethanol as a precursor

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Effect test

Embodiment 1

[0036] S1: Fix the SiC fiber without any pretreatment on a specific mold, wrap it with graphite paper, and then place it in a box furnace for heat treatment in an air environment of 650°C, and the holding time is 2h;

[0037]S2: Ultrasonic cleaning the SiC fiber treated in step S1 for 30 minutes with absolute ethanol to remove the fiber surface-setting glue;

[0038] S3: put the SiC fiber treated in step S2 into a box furnace, and quickly dry the SiC fiber in an air environment of 60° C., and the holding time is 30 minutes;

[0039] S4: Fix the SiC fiber treated in step S3 on the mold, put it into the CVD reaction furnace, pass argon gas at a flow rate of 80ml / min as a protective gas, and increase the furnace temperature at a heating rate of 10°C / min From room temperature to 1350°C;

[0040] S5: Pass ethanol into the CVD system by bubbling method, the bubbling carrier gas and protective gas are both argon, the total gas flow rate: 5L / min; the ratio of carrier gas flow rate to...

Embodiment 2

[0045] S1: Fix the SiC fiber without any pretreatment on a specific mold, wrap it with graphite paper, and then place it in a box furnace for heat treatment in an air environment of 650°C, and the holding time is 2h;

[0046] S1: Ultrasonic cleaning the SiC fibers treated in step S1 for 30 minutes with absolute ethanol to remove the fiber surface-setting glue;

[0047] S1: Put the SiC fibers treated in step S2 into a box furnace, and quickly dry the SiC fibers in an air environment of 60°C, and the holding time is 30 minutes;

[0048] S1: Fix the SiC fiber treated in step S3 on the mold, and put it into the CVD reaction furnace

[0049] In the process, argon was introduced as a protective gas at a flow rate of 40ml / min, and the furnace temperature was raised from room temperature to 1200°C at a heating rate of 5°C / min;

[0050] S1: Bubble ethanol into the CVD system by bubbling method, use argon as the bubbling carrier gas and protective gas, use a vacuum pump to maintain the...

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Abstract

The invention discloses a method for preparing a pyrolytic carbon (Pyrolytic Carbon, PyC) interface coating by using ethanol as a single precursor, utilizing the higher chemical activity of alcohols and the function of hydroxyl in gas phase reaction, through controlling temperature, PyC interfacial coatings with different textures, deposition rates and thicknesses were prepared at the five parameter levels of total gas pressure, ethanol residence time, ethanol partial pressure, and deposition time. Through the technical scheme of the present invention, the problems of slow deposition rate, high cost, and difficult control of texture shape in the process of preparing the PyC coating on the surface of SiC fibers are solved, and at the same time, a layer of uniform thickness and texture can be deposited on the surface of SiC fibers. Shape-controllable PyC interface coatings.

Description

technical field [0001] The invention belongs to silicon carbide fiber reinforced silicon carbide (SiC f / SiC) composite material interface coating preparation technology field, in particular to a preparation method for depositing a pyrolytic carbon (PyC) interface coating on the surface of silicon carbide (SiC) fibers using ethanol as a single precursor. Background technique [0002] SiC f / SiC composites have extremely broad application prospects in aerospace thermal structural components due to their high specific strength and specific modulus, high-temperature mechanical properties and excellent creep resistance. However, SiC ceramics are inherently brittle. How to achieve a significant improvement in the toughness of composite materials through the synergistic effect of SiC matrix and SiC fibers while maintaining the good high-temperature mechanical properties of SiC matrix materials has become an important issue for SiC ceramics. f / The core technical issues in the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/80C04B35/628
CPCC04B35/565C04B35/62873C04B35/62884C04B2235/5244
Inventor 王文浩李露徐昊马朝利
Owner BEIHANG UNIV
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