SiC/SiC composite material wide temperature range thermal protective coating and preparation method thereof

A composite material and heat protection technology, applied in the field of preparation of heat protection coatings, can solve the problems of weak erosion resistance of coatings, difficulty in maintaining structural stability, weak bonding strength and thermal shock resistance, etc., to achieve increased matching , Improve high temperature oxidation resistance, ensure integrity and compactness

Active Publication Date: 2019-02-12
AVIC BASIC TECH RES INST
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Traditional thermal protection coatings are mainly SiC coatings (CVD-SiC coatings) prepared by chemical vapor deposition processes. CVD-SiC coatings are generally used to fill small gaps inside SiC/SiC composite materials, and their oxidation products are at 800 The temperature range of ℃~1000℃ has a loose structure, and it is difficult to seal the penetration path of the oxidizing medium; at the same time, the coating has weak erosion resistance, and it is difficult to maintain structural stability under the impact of gas particles, thermal shock an...

Method used

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preparation example Construction

[0035] The preparation method of the SiC / SiC composite material wide temperature range thermal protective coating of the present invention comprises the following steps:

[0036] 1) Preparation of SiC ceramic transition layer

[0037] 1.1) Using polycarbosilane as the solute and xylene as the solvent, configure a polycarbosilane xylene solution 1, the solute accounting for 30 to 70% by weight of the polycarbosilane xylene solution;

[0038] 1.2) Put the SiC / SiC composite material in polycarbosilane xylene solution 1, and vacuum impregnate it for more than 10 hours;

[0039] 1.3) After the impregnation is completed, place the SiC / SiC composite material in a high-temperature cracking furnace, vacuumize until the internal pressure of the high-temperature cracking furnace is less than 5KPa, and perform high-temperature cracking at 1000 ° C to 1300 ° C. After 0.5 hours to 2 hours, obtain a SiC / SiC composite material of SiC ceramic transition layer;

[0040] 2) Preparation of SiBC...

Embodiment 1

[0055] 1. Preparation of SiC ceramic transition layer: take polycarbosilane as solute, xylene as solvent, solute accounts for 50% by weight of precursor solution, configure polycarbosilane xylene solution; place SiC / SiC composite material in poly Carbosilane xylene solution, vacuum impregnation for more than 10h; after impregnation, place the SiC / SiC composite material in a high-temperature cracking furnace, vacuumize to less than 5KPa, and crack at a high temperature of 1000°C to 1300°C for 2 hours to obtain SiC SiC / SiC composites for ceramic transition layers.

[0056] 2. Preparation of SiBCN ceramic transition layer: polyborazine is used as the solute, xylene is used as the solvent, and the solute accounts for 50% of the weight percentage of the precursor solution, and the polyborazine xylene solution is configured; the step 1 is completed The SiC / SiC composite material for preparing the SiC ceramic transition layer is placed in a polyborazine xylene solution, vacuum-impreg...

Embodiment 2

[0061] 1. Preparation of SiC ceramic transition layer: take polycarbosilane as solute, xylene as solvent, solute accounts for 40% by weight of precursor solution, configure polycarbosilane xylene solution; place SiC / SiC composite material in poly Carbosilane xylene solution, vacuum impregnation for more than 10h; after impregnation, put the SiC / SiC composite material in a high-temperature cracking furnace, vacuumize to less than 5KPa, high-temperature cracking temperature is 1300°C, and hold for 0.5 hours to obtain SiC ceramics SiC / SiC composites for the transition layer.

[0062] 2. Preparation of SiBCN ceramic transition layer: polyborazine is used as solute, xylene is used as solvent, solute accounts for 40% by weight of the precursor solution, and polyborazine xylene solution is configured; step 1 is completed The SiC / SiC composite material for preparing the SiC ceramic transition layer is placed in a polyborazine xylene solution, vacuum-impregnated for more than 10 hours,...

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Abstract

The invention relates to a SiC/SiC composite material wide temperature range thermal protective coating. The coating is composed of a transition layer, a hole-sealing layer and an anti-washout layer.The transition layer is made of SiC and SiBCN ceramic prepared through a polymer precursor infiltration and pyrolysis (PIP) technology. The hole-sealing layer is made of SiBCN ceramic prepared througha slurry method and CVD-SiC prepared through a chemical vapor deposition technology. The anti-washout layer is made of a yttrium silicate coating prepared through a molten-salt growth method. The invention further relates to a preparation method of the SiC/SiC composite material wide temperature range thermal protective coating. The coating has excellent thermal shock resistance and antioxidant property in the wide temperature range of 800-1300 DEG C, and has wide application prospects in hot end parts such as aero-engine exhaust nozzles, heat shields and turbine outer rings and thermal protective structures of aircrafts with high Mach number such as leading edges and rudders.

Description

technical field [0001] The invention belongs to the technical field of preparation of thermal protection coatings, and in particular relates to a SiC / SiC composite material wide temperature range thermal protection coating and a preparation method thereof. Background technique [0002] SiC / SiC composite materials have the characteristics of low density, high temperature resistance, high hardness, oxidation resistance, and excellent mechanical properties. It is an ideal material for thermal protection structure of high Mach number aircraft. [0003] However, the current engineering production of raw material SiC fibers has a high carbon content or oxygen content, which limits the oxidation resistance of SiC / SiC composites. In addition, the porosity of SiC / SiC composites prepared by traditional preparation processes (such as chemical vapor deposition process and polymer precursor impregnation cracking process) is relatively high, reaching 5% to 15%, and the oxidation media ox...

Claims

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Application Information

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IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B41/5066C04B41/5064C04B41/0072C04B41/5059C04B41/4531C04B41/5045C04B41/4539C04B35/806C04B35/565
Inventor 陈明伟邱海鹏谢巍杰张冰玉
Owner AVIC BASIC TECH RES INST
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