Method for preparing graphite high-temperature-resistant composite coating through cooperation of electrochemistry and impregnation

A composite coating, high temperature resistant technology, applied in the field of graphite high temperature coating, can solve the problems such as the inability to meet the anti-oxidation requirements of graphite materials, poor bonding between the coating and the substrate, and insufficient air tightness of the coating, so as to facilitate industrial production and application. , Not easy to fall off, good air tightness

Active Publication Date: 2020-10-27
江西宁新新材料股份有限公司 +1
View PDF13 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the single silicon carbide coating is easy to fall off due to poor bonding between the coating and the substrate; on the other hand, the airtightness of the coating is not enough, which cannot meet the oxidation resistance requirements of graphite materials. Coating preparation method for layer anti-oxidation effect

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
  • Method for preparing graphite high-temperature-resistant composite coating through cooperation of electrochemistry and impregnation
  • Method for preparing graphite high-temperature-resistant composite coating through cooperation of electrochemistry and impregnation
  • Method for preparing graphite high-temperature-resistant composite coating through cooperation of electrochemistry and impregnation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Select graphite base material, polish the surface and ultrasonically treat it with absolute ethanol. After the surface is dry, put it in an oven and place it at 100°C for 2 hours before use.

[0028] (2) Preparation of matrix suspension: mix silicon carbide 18g / L, alumina 5g / L, aluminum phosphate 8g / L, phenolic resin 10g / L, nano silicon powder 6g / L, graphite powder 3g / L, dodecyl Sodium benzenesulfonate 2g / L, the rest is added to 1L with ethanol, and then ultrasonic treatment is performed for 60 minutes to obtain a matrix suspension.

[0029] (3) Preparation of phosphate coating: weigh 35g aluminum dihydrogen phosphate, 7g sodium hexametaphosphate, 2g nano alumina, 3g silica, 1g sodium dodecylbenzene sulfonate, 52g solvent water, and then perform 60min Ball mill treatment to obtain phosphate coating;

[0030] (4) Fix it with an electrochemical fixture, adjust it and place it in parallel between two high-purity graphite blocks, connect the working electrode, and use the cal...

Embodiment 2

[0036] (1) Select graphite base material, polish the surface and ultrasonically treat it with absolute ethanol. After the surface is dry, put it in an oven and place it at 100°C for 2 hours before use.

[0037] (2) Preparation of matrix suspension: 10g / L silicon carbide, 5g / L aluminum oxide, 9g / L aluminum phosphate, 12g / L phenolic resin, 10g / L nano silicon powder, 4g / L graphite powder, dodecyl Sodium benzenesulfonate 2g / L, the rest is added to 1L with ethanol, and then ultrasonic treatment is performed for 60 minutes to obtain a matrix suspension.

[0038] (3) Preparation of phosphate coating: weigh 25g aluminum dihydrogen phosphate, 10g magnesium dihydrogen phosphate, 7g sodium hexametaphosphate, 1.5g nano alumina, 3.5g silica, and 1g sodium dodecylbenzene sulfonate. 52g of solvent water, followed by ball milling for 60 minutes to obtain a phosphate dipping solution;

[0039] (4) Fix it with an electrochemical fixture, adjust it and place it in parallel between two high-purity grap...

Embodiment 3

[0045] (1) Select graphite base material, polish the surface and ultrasonically treat it with absolute ethanol. After the surface is dry, put it in an oven and place it at 100°C for 2 hours before use.

[0046] (2) Preparation of matrix suspension: 10g / L silicon carbide, 5g / L aluminum oxide, 9g / L aluminum phosphate, 12g / L phenolic resin, 10g / L nano silicon powder, 4g / L graphite powder, dodecyl Sodium benzenesulfonate 2g / L, the rest is added to 1L with ethanol, and then ultrasonic treatment is performed for 60 minutes to obtain a matrix suspension.

[0047] (4) Fix it with an electrochemical fixture, adjust it and place it in parallel between two high-purity graphite blocks, connect the working electrode, and use the calomel electrode as the reference electrode, select CHI606 electrochemical workstation, it curve, set the voltage 10V, and time 250S, electrochemical deposition in the substrate suspension.

[0048] (5) After the graphite substrate is electrochemically deposited and coa...

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 provides a method for preparing a graphite high-temperature-resistant composite coating through cooperation of electrochemistry and impregnation. The method is characterized in that firstly, pre-treating the surface of a graphite base material; carrying out electrochemical deposition on a SiC/Si/C coating in the matrix suspension, drying the surface solvent in a drying oven, dippingin a phosphate coating or brushing with the phosphate coating, carrying out pre-heating treatment on the graphite substrate, and finally sintering to form the high-temperature-resistant composite coating on the graphite substrate. The high-temperature-resistant coating has a good anti-oxidation effect and plays a role in protecting the graphite base material.

Description

Technical field [0001] The invention relates to a method for preparing a graphite high-temperature resistant composite coating by electrochemistry-dipping coordination, and belongs to the technical field of graphite high-temperature coatings. Background technique [0002] Graphite has the characteristics of high density and high strength. It is a good high-temperature structural material. It can be used as nuclear graphite, electrodes for electrical discharge machining, structural materials for rocket technology, and aluminum plating. Graphite has a wide range of applications in many occasions, especially under high temperature conditions, graphite has very good high temperature strength. But its fatal problem is that it is rapidly oxidized in the presence of oxygen, which seriously affects the performance and service life. Therefore, it is necessary to improve the oxidation resistance of graphite. The usual practice is to provide a coating on the graphite substrate to improve t...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89C04B41/52
CPCC04B41/89C04B41/52C04B41/5096C04B41/5059C04B41/5001C04B41/4564C04B41/5035C04B41/5031C04B41/5015C04B41/4539C04B41/0072
Inventor 吴相福陈香萍田家利邓达琴洪文晶李海航李江标刘春根邓聪秀
Owner 江西宁新新材料股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap