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A fiber prefabricated body with double wave-transparent ceramic coating and its preparation method

A technology of ceramic coating and prefabricated body, which is applied in the field of preparation of high-temperature electromagnetic wave-transparent composite materials, which can solve the problems of easy moisture absorption of boron nitride coating, limited temperature resistance of quartz fiber, oxidation, etc., and achieve poor oxidation resistance , improve overall performance, and reduce heat damage

Active Publication Date: 2022-03-29
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the temperature resistance of the quartz fiber used in this process is limited, and the boron nitride coating is easy to absorb moisture and oxidize

Method used

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  • A fiber prefabricated body with double wave-transparent ceramic coating and its preparation method
  • A fiber prefabricated body with double wave-transparent ceramic coating and its preparation method
  • A fiber prefabricated body with double wave-transparent ceramic coating and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for preparing a fiber preform with a double transparent wave ceramic coating in this embodiment comprises the following steps:

[0044] (1) Put the silicon nitride fiber into the deposition furnace, heat it to 1100°C at a heating rate of 10°C / min under the protection of nitrogen atmosphere, then vacuumize, and use the carrier gas and diluent gas (both nitrogen) to move the precursor The liquid borazine (concentration is 3.1vol.%) is brought into the deposition furnace; at the same time, adjust the working state of the vacuum pump to keep it in balance with the flow rate of the carrier gas to achieve the pressure required for deposition and keep it stable. When stable, the corresponding The flow rate of the carrier gas is 0.2L / min, the flow rate of the dilution gas is 1.0L / min, the pressure of the precursor gas tank is 0.16MPa, the pressure of the mixing tank is 0.3MPa, and the deposition time is 60min. After the deposition is completed, turn off the carrier gas ...

Embodiment 2

[0056] A method for preparing a fiber preform with a double transparent wave ceramic coating in this embodiment comprises the following steps:

[0057] (1) Put the silicon nitride fiber into the deposition furnace, heat it to 1300°C at a heating rate of 10°C / min under the protection of nitrogen atmosphere, then vacuumize, and use the carrier gas and dilution gas (both nitrogen) to move the precursor The liquid borazine (concentration is 3.1vol.%) is brought into the deposition chamber; at the same time, adjust the working state of the vacuum pump to keep it in balance with the flow rate of the carrier gas to achieve the pressure required for deposition and keep it stable. When stable, the corresponding The flow rate of the carrier gas is 0.2L / min, the flow rate of the dilution gas is 1.0L / min, the pressure of the precursor gas tank is 0.16MPa, the pressure of the mixing tank is 0.3MPa, and the deposition time is 30min. After the deposition is completed, turn off the carrier gas...

Embodiment 3

[0061] A method for preparing a fiber preform with a double transparent wave ceramic coating in this embodiment comprises the following steps:

[0062](1) Put the silicon nitride fiber into the deposition furnace, heat it to 1200°C at a heating rate of 10°C / min under the protection of nitrogen atmosphere, then vacuumize, and use the carrier gas and diluent gas (both nitrogen) to move the precursor to 1200°C. The liquid borazine (concentration is 3.1vol.%) is brought into the deposition chamber; at the same time, adjust the working state of the vacuum pump to keep it in balance with the flow rate of the carrier gas to achieve the pressure required for deposition and keep it stable. When stable, the corresponding The flow rate of the carrier gas is 0.6L / min, the flow rate of the dilution gas is 1.3L / min, the pressure of the precursor gas tank is 0.16MPa, the pressure of the mixing tank is 0.3MPa, and the deposition time is 60min. After the deposition is completed, turn off the ca...

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Abstract

The invention discloses a preparation method of a fiber prefabricated body with a double-transparent wave ceramic coating, which comprises the following steps: using borazine as a precursor, and adopting a chemical vapor deposition process to deposit a BN coating on the surface of a nitride fiber to obtain a single coating layer nitride fiber; put the obtained single-coated fiber into the perhydropolysilazane (PHPS) solution and soak it completely, take it out, evaporate the solvent at room temperature, and then transfer it to a constant temperature and humidity box for hydrolysis conversion to obtain a double-transparent fiber. Wave ceramic coated fiber preforms. The method has the advantages of simple equipment, safe process and low cost, and the prepared wave-transparent fiber preform is resistant to high temperature, oxidation and moisture absorption, and is expected to be applied to the reinforcement of oxide-based wave-transparent composite materials.

Description

technical field [0001] The invention belongs to the field of preparation of high-temperature electromagnetic wave-transparent composite materials, and in particular relates to a fiber prefabricated body with double wave-transparent ceramic coatings and a preparation method thereof. Background technique [0002] High speed, long endurance, and high precision are the development trends of a new generation of aircraft. The radome / window, which is the key electromagnetic transmission part of the aircraft, will face the extremely harsh environment of continuous heating and loading for a long time. So far, there are not many varieties of high-temperature wave-transmitting materials with good comprehensive performance, and only continuous fiber-reinforced ceramic-based wave-transmitting materials are expected to meet their application requirements. [0003] Common high-temperature wave-transparent fiber reinforcements mainly include quartz fibers, alumina fibers and nitride fibers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/628C04B35/80
CPCC04B35/62868C04B35/62857C04B35/62884C04B35/62886C04B35/62894C04B35/80
Inventor 李端于秋萍
Owner NAT UNIV OF DEFENSE TECH
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