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Method for repairing medium temperature coating (1000 to 1400 DEG C) of silicon carbide base composite material toughened by carbon fiber

A technology for toughening silicon carbide-based and composite materials, which is applied in the field of repairing carbon fiber toughened silicon carbide-based composite materials in the field of medium-temperature coatings, can solve the problems of surface coating damage, high equipment requirements, component failure, etc., and meets the requirements of preparation equipment The effect of low cost, lower usage cost and longer service life

Inactive Publication Date: 2013-11-06
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that the surface coating of C / SiC composite materials will be damaged to a certain extent during the processing and equipment process. The damage of the coating may cause the carbon fiber to be exposed to the gas environment, and the oxidation of the carbon fiber will cause the failure of the component and seriously affect the material. normal use
However, there are few reports on the coating online repair technology in the medium temperature (1000-1400 °C) area.
[0005] There are many coating preparation technologies at present, but none of them can be repaired online, such as CVD method, which requires high equipment for preparing coatings, which limits its online repair behavior

Method used

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  • Method for repairing medium temperature coating (1000 to 1400 DEG C) of silicon carbide base composite material toughened by carbon fiber
  • Method for repairing medium temperature coating (1000 to 1400 DEG C) of silicon carbide base composite material toughened by carbon fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: The carbon fiber toughened silicon carbide matrix composite material to be repaired is ultrasonically cleaned with clean water for 30 minutes, then placed in an oven at 100°C for 30 minutes and dried for use;

[0023] Step 2: add 100% ethanol to the silicon powder as a solvent, add 20% polyazide silane as a binder, and ball mill for about 30 minutes to obtain a uniformly mixed slurry;

[0024] Step 3: Brush the uniformly mixed slurry on the surface of the substrate, and cure it for about 5-6 hours at 120°C (infrared lamps can be used on site) to obtain an inner coating; the purpose of the inner coating is to improve the coating layer-to-substrate adhesion.

[0025] Step 4: Add 100% ethanol to BSAS powder as a solvent, add 20% polyazide silane as a binder, and ball mill for about 30 minutes to obtain a uniformly mixed slurry;

[0026] Step 5: Brush the uniformly mixed slurry on the inner coating prepared in steps 2 and 3, and cure it completely at 120°C (infrare...

Embodiment 2

[0031] Step 1: The carbon fiber toughened silicon carbide matrix composite material to be repaired is ultrasonically cleaned with clean water for 30 minutes, then placed in an oven at 100°C for 30 minutes and dried for use;

[0032] Step 2: add 100% ethanol to silicon powder as a solvent, add 20% polycarbosilane as a binder, and ball mill for about 30 minutes to obtain a uniformly mixed slurry;

[0033] Step 3: Brush the uniformly mixed slurry on the surface of the substrate, and cure it for about 10-12 hours at 80°C (infrared lamps can be used on site) to obtain an inner coating; the purpose of the inner coating is to improve the coating layer-to-substrate adhesion.

[0034] Step 4: Add 100% ethanol to BSAS powder as a solvent, add 20% polycarbosilane as a binder, and ball mill for about 30 minutes to obtain a uniformly mixed slurry;

[0035] Step 5: Brush the uniformly mixed slurry on the inner coating prepared in steps 2 and 3, and cure it completely at 80°C (infrared lamp...

Embodiment 3

[0040] Step 1: The carbon fiber toughened silicon carbide matrix composite material to be repaired is ultrasonically cleaned with clean water for 30 minutes, then placed in an oven at 100°C for 30 minutes and dried for use;

[0041] Step 2: add 100% ethanol to the silicon powder as a solvent, add 20% polyazide silane as a binder, and ball mill for about 30 minutes to obtain a uniformly mixed slurry;

[0042] Step 3: Brush the uniformly mixed slurry on the surface of the substrate, and cure it for about 5-6 hours at 120°C (infrared lamps can be used on site) to obtain an inner coating; the purpose of the inner coating is to improve the coating layer-to-substrate adhesion.

[0043] Step 4: Add 100% ethanol to BSAS powder as a solvent, add 20% polyazide silane as a binder, and ball mill for about 30 minutes to obtain a uniformly mixed slurry;

[0044] Step 5: Brush the uniformly mixed slurry on the inner coating prepared in steps 2 and 3, and cure it completely at 120°C (infrare...

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Abstract

The invention relates to a method for repairing a medium temperature coating (1000 to 1400 DEG C) of a silicon carbide base composite material toughened by carbon fiber. The method mainly uses silicon powder, barium strontium aluminium silicon (BSAS) and low-melting glass powder as raw materials, adding a certain amount of organosilane and solvent to prepare uniform slurry, coating the slurry onto the surface of the damaged coating of the silicon carbide base composite material toughened by the carbon fiber, and getting the compact coating which is well combined with the matrix through low temperature solidification. The method effectively resolves problems of online repair of the damaged coating of the silicon carbide base composite material toughened by the carbon fiber, and meanwhile the method has advantages of short preparation period, simple process and good repeatability. The prepared coating system is proven to be able to effectively improve antioxidation performance of the composite material in a temperature range of 1000 to 1400 DEG C.

Description

technical field [0001] The invention relates to a method for repairing a medium-temperature coating of a carbon fiber-toughened silicon carbide-based composite material, and relates to an online repair method for a medium-temperature coating (1000-1400° C.) of a carbon-fiber-toughened silicon carbide-based composite material. Background technique [0002] Continuous carbon fiber-toughened SiC-based composites exhibit metal-like fracture behavior, are insensitive to cracks, and do not undergo catastrophic failure. Its high temperature resistance and low density make it a key material for the development of heat-resistant structures for advanced aero-engines, rocket engines and aerospace vehicles. In terms of aero-engine applications, C / SiC materials are used for the nozzles and exhaust regulators on the M88-2 and M53-2 engines produced by the French SNECMA company. C / SiC materials are mainly used in large-area thermal protection systems on hypersonic vehicles, which are 50% ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
Inventor 王一光成来飞张立同杨娟
Owner NORTHWESTERN POLYTECHNICAL UNIV
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