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A high-temperature corrosion-resistant high-emissivity ceramic coating and its preparation method

A high-emissivity, ceramic coating technology, applied in the field of special coatings, can solve the problems of high temperature corrosion, difficult to control boiler air volume, and increase the cost of water-cooled wall pipes, so as to reduce external energy loss and spraying process costs. The effect of low and low cost of spraying process

Active Publication Date: 2017-05-17
HANGZHOU ZHEDA TIANYUAN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of aluminized tubes will increase the cost of the water-cooled wall tubes and shorten the service life; the use of wall-attached air will reduce the efficiency of the boiler, and the system layout is complicated; the air volume of the boiler is not easy to control during actual operation
It can be seen that these measures cannot solve the problem of high temperature corrosion well.

Method used

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  • A high-temperature corrosion-resistant high-emissivity ceramic coating and its preparation method
  • A high-temperature corrosion-resistant high-emissivity ceramic coating and its preparation method
  • A high-temperature corrosion-resistant high-emissivity ceramic coating and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The binder liquid that is 20% by mass percent is added with water is mixed to obtain binder liquid, wherein the mass percent of aluminum dihydrogen phosphate binder is 15 percent, and the mass percent of water glass binder is 5 percent, then Add the dispersant triethanolamine that mass percentage is 0.15%, the defoamer n-octanol that mass percentage is 0.1%, the wetting agent JFC that mass percentage is 0.05%, then add mass percentage that is 18 % of fillers, wherein the fillers include: 3% titanium dioxide, 4% copper oxide, 6% silicon dioxide, 4% graphite, 1% cerium oxide, after grinding for 1 hour by a planetary ball mill, add 0.15% by mass The dispersant triethanolamine, the defoamer n-octanol with a mass percentage of 0.1%, and the wetting agent JFC with a mass percentage of 0.05% are continuously ground until the particle size of the coating is 200-700nm, and then filtered and packaged.

Embodiment 2

[0024] The binding agent that is 23% by mass percentage is mixed with water to obtain binding agent liquid, wherein the mass percentage of aluminum dihydrogen phosphate binding agent is 17%, and the mass percentage of water glass binding agent is 6%, then Add the dispersant triethanolamine that mass percentage is 0.15%, the defoamer n-octanol that mass percentage is 0.1%, the wetting agent JFC that mass percentage is 0.05%, then add mass percentage that is 19% % of fillers, wherein the fillers include: 3% titanium dioxide, 4% copper oxide, 7% silicon dioxide, 4% graphite, 1% cerium oxide, after grinding for 1 hour by a planetary ball mill, add 0.15% by mass The dispersant triethanolamine, the defoamer n-octanol with a mass percentage of 0.1%, and the wetting agent JFC with a mass percentage of 0.05% are continuously ground until the particle size of the coating is 200-700nm, and then filtered and packaged.

Embodiment 3

[0026] The binder liquid that is 27% by mass percent is added with water is mixed to obtain binder liquid, wherein the mass percent of aluminum dihydrogen phosphate binder is 19 percent, and the mass percent of water glass binder is 8 percent, then Add the dispersant triethanolamine that the mass percentage is 0.25%, the defoamer n-octanol that the mass percentage is 0.25%, the wetting agent JFC that the mass percentage is 0.1%, then add the mass percentage that is 21% % of fillers, wherein the fillers include: 4% titanium dioxide, 5% copper oxide, 6% silicon dioxide, 4.5% graphite, 1.5% cerium oxide, after grinding for 1 hour by a planetary ball mill, add 0.25% by mass The dispersant triethanolamine, the defoamer n-octanol with a mass percentage of 0.25%, and the wetting agent JFC with a mass percentage of 0.1% are continuously ground until the particle size of the coating is 200-700nm, and then filtered and packaged.

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Abstract

The invention provides a high emissivity ceramic coating with high temperature corrosion resistance and preparation method thereof, and belongs to the technical field of special coatings. The ceramic coating comprises the following ingredients by mass percentage: 18-22% of filling materials, 20-30% of binders and balance being water, wherein the filling materials comprises 3-4% of titanium dioxide, 4-5% of silica, 4-4.5% of graphite, and 1-1.5% of cerium oxide. The preparation method is as follows: adding water in the binders, stirring until the binder and the water are uniform, adding the filling materials in the binder liquid, wherein the filling materials is subjected to a thinning processing and the size ranges from 500 to 1000nm, then adding half of adjuvant and stirring until the adjuvant is uniform, grinding by a planetary bowl mill for one hour and adding the other half of adjuvant, continuing grinding until the size of the ceramic materials ranges from 200 to 700nm, then filtering and packaging. The coating can be applied on the heating surface of the boiler water screen and superheater, and the coating can be cured by high temperature and forms a dense ceramic coating which effectively alleviates high temperature corrosion of heating surface, increases emissivity of the heating surface, enhances heat exchange effects and promotes boiler efficiency.

Description

technical field [0001] The invention belongs to the technical field of special coatings, and in particular relates to a high-temperature corrosion-resistant high-emissivity ceramic coating and a preparation method thereof. Background technique [0002] During the operation of power plant boilers, the heating surfaces of water-cooled walls, superheaters, and reheaters are at high operating temperatures. Harmful components in flue gas and fly ash will chemically react with metal walls to form high-temperature corrosion. High-temperature corrosion will thin the pipe wall and reduce its strength, and the pipe burst and leakage accident caused by it is an important reason for the unplanned outage of the generating set. High temperature corrosion generally includes sulfide corrosion, chloride corrosion, reducing atmosphere corrosion and sulfate corrosion, etc. These corrosion problems seriously affect the safe operation and economic benefits of power plants, reduce the service lif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 游国平王进卿张文涛曲成刚韩洋池俊杰薛飞
Owner HANGZHOU ZHEDA TIANYUAN SCI & TECH
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