Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Microwave preparation method of anti-oxidation coating made of carbon-based material

A carbon-based material and anti-oxidation technology, which is applied in the field of preparation of high-temperature anti-oxidation coatings for C-based materials, can solve problems such as lack of product quality, complex equipment, and high cost, and achieve reduced equipment complexity, reduced operating costs, and prevention of substrate The effect of oxidation

Inactive Publication Date: 2010-08-04
UNIV OF SCI & TECH BEIJING
View PDF1 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Chinese patent 200610041916.7 uses MoSi 2 -SiC-Si slurry method prepares a multi-layer structure, and obtains a good anti-oxidation effect through surface siliconization under high temperature conditions, but each coating treatment needs to be processed in a vacuum furnace, and the temperature is as high as 1500-2300 ° C. Due to the slow speed of siliconization, the reaction time is several hours, the cost is high, and the equipment is complicated
The US patent reports the SiC anti-oxidation coating technology prepared by CVD technology, which also has the problems of complex equipment and high operating costs, and is not suitable for the preparation of complex-shaped parts.
Summarize the main shortcomings of the existing anti-oxidation coating preparation technology of carbon-based composite materials represented by C / C composite materials: 1. The preparation process is complicated; 2. Using CVD, vacuum treatment furnace and other equipment, the operating cost is high The quality lacks stability 3. It is difficult to apply an anti-oxidation coating on the surface of some samples with complex shapes, which can no longer meet the needs of actual work

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Microwave preparation method of anti-oxidation coating made of carbon-based material
  • Microwave preparation method of anti-oxidation coating made of carbon-based material
  • Microwave preparation method of anti-oxidation coating made of carbon-based material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First prepare the slurry: weigh 27% of Si powder, 25% of C, and 33% of SiO 2 , 12% Al 2 o 3 powder, 2% Al aluminum powder, add 1% hydroxyethyl cellulose thickener, use absolute ethanol as a dispersant, put the above-mentioned weighed ingredients in a container for ultrasonic dispersion, not less than 10min, and then use Silica sol is used as a binder, and the addition amount of silica sol is 5% of the above slurry. The slurry is prepared by conventional paint stirring equipment, and the stirring time is 35 minutes; at the same time, the surface pretreatment process of the substrate is as follows: the carbon materials are respectively No. 600, No. 1500 and No. 2000 sandpapers were polished in turn, washed with absolute ethanol, and placed in an oven at 100°C for later use. The slurry coating process is as follows: the treated base material is dipped and coated with the prepared slurry, and dried in an oven at 100°C. The coating sintering process is as follows: put gra...

Embodiment 2

[0021] First prepare the slurry: weigh 20% of Si powder, 14% of C, and 45% of SiO 2 , 5% SiC powder, 10% Al 2 o 3 Powder, 5% Al aluminum powder, use absolute ethanol as dispersant, add 1% soluble starch thickener, the addition of silica sol is 3% of the above slurry, and adjust the slurry through conventional paint mixing equipment; matrix The surface pretreatment process is as follows: the C / C composite material is polished and polished with No. 600, No. 1500 and No. 2000 sandpaper in turn, washed with absolute ethanol, and placed in an oven at 100 ° C for use. The slurry coating process is as follows: the treated base material is dipped and coated with the prepared slurry, and dried in an oven at 100°C. The coating sintering process is as follows: put graphite powder in the alumina crucible, put the base material coated with the slurry in the crucible, then cover it completely with graphite powder, put it into a 700W microwave oven, and first adjust the power of the microw...

Embodiment 3

[0023] First prepare the slurry: weigh 12% Si powder, 20% C, and 43% SiO respectively 2 , 12% SiC powder, 5% Al 2 o 3 Powder, 8% Al aluminum powder, using absolute ethanol as a dispersant, the addition of silica sol is 8% of the above slurry, adjusted to slurry by conventional paint mixing equipment; the surface pretreatment process of the substrate is: The / SiC composite materials were respectively polished and polished with No. 600, No. 1500 and No. 2000 sandpapers in sequence, washed with absolute ethanol, and placed in an oven at 100°C for use. The slurry coating process is as follows: the treated base material is dipped and coated with the prepared slurry, and dried in an oven at 100°C. The coating sintering process is as follows: put graphite powder in the alumina crucible, put the base material coated with the slurry in the crucible, then cover it completely with graphite powder, put it into a 700W microwave oven, and first adjust the power of the microwave oven to 40...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a microwave preparation method of an anti-oxidation coating made of a carbon-based material, in particular to a substrate material which may be a carbon material, a C / C composite material or a C / SiC composite material. In the invention, slurry prepared by using Si compounds is coated on the carbon-based material, which is subjected to surface treatment, by a brush or immersion, then the carbon-based material is buried in graphite powder in a corundum crucible, the corundum crucible is placed in microwaves to be heated, the pre-heating, heating and temperature preservation are performed by stepwise regulating the power of a microwave oven, and thus, an anti-oxidation single-layer coating is obtained; on this basis, a composite coating of oxides, silicides and the like can be obtained. In the invention, microwaves act directly on the carbon-based material and the carbon-based material, after absorbing the microwaves, generate heat raises the temperature to a required temperature, so that the coating and a substrate are bonded and a protective coating with high protective performance is obtained; and as aluminum powder is added as a SiC sintering aid, the compaction of the SiC is promoted by the silicon aluminum alloy produced by the low-melting-point aluminum and part of molten silicon.

Description

technical field [0001] The invention relates to a preparation method of a C-based material high-temperature anti-oxidation coating, in particular to the surface treatment of a carbon material, a C / C composite material and a C / SiC composite material as a base material, and belongs to the surface technology field. Background technique [0002] C-based composite materials, such as C / C composite materials, refer to composite materials composed of carbon matrix and carbon fiber, which have excellent high specific strength, ablation resistance, thermal shock resistance, low creep and high temperature performance stability, etc. It has a wide range of applications in aerospace and military technology and other fields. However, due to the rapid oxidation of C / C composite materials above 500 °C in the air, resulting in devastating damage, its application range is very limited. A lot of research has been done on the anti-oxidation methods of C / C composite materials at high temperature...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B41/85C04B41/50
Inventor 孔祥华沈奎段方苗刘虎王帅
Owner UNIV OF SCI & TECH BEIJING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com