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Ceramic paint used on surface of steel and preparing method thereof

A technology for steel surface and ceramic coating, applied in the field of materials science, can solve the problems of low bonding force between ceramic coating and metal substrate, can not meet the anti-corrosion requirements of the heating surface of power plant boilers, etc., achieves low cost, high temperature molten salt corrosion inhibition, The effect of good application prospects

Active Publication Date: 2015-12-30
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a ceramic paint for steel surface and its preparation method. The ceramic paint for steel surface and its preparation method solve the problems in the prior art. The low bonding force between the ceramic coating and the metal substrate cannot meet the technical problem of anti-corrosion requirements of the heating surface of the boiler in the power plant

Method used

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  • Ceramic paint used on surface of steel and preparing method thereof
  • Ceramic paint used on surface of steel and preparing method thereof
  • Ceramic paint used on surface of steel and preparing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The concrete steps of the method for preparing metal-based ceramic coating by thermochemical reaction of the present invention are as follows:

[0028] (1) Preparation of coating slurry:

[0029] Add sodium hydroxymethylcellulose into the deionized water, the specific ratio is 2-3g / L, then stir and heat to form a paste;

[0030] Put the ceramic aggregate in a certain proportion (mass fraction: 25% silica, 25% alumina, 10% titanium dioxide, 40% kaolin) into a ball mill jar and mill at 500r / min for 2-4h; then according to the weight percentage, mix 50 % ceramic aggregate, 2% tungsten carbide, 30% sodium silicate, and 4% sodium carbonate are mixed evenly, and the mixed powder is put into 14% prepared sodium hydroxymethyl cellulose aqueous solution. The mass of sodium hydroxymethyl cellulose accounts for 3% of the total mass of the paint, after stirring and aging for 24 hours, the mixed slurry was obtained;

[0031] (2) Coat the slurry prepared in step (1) evenly on the p...

Embodiment 2

[0033] The concrete steps of the method for preparing metal-based ceramic coating by thermochemical reaction of the present invention are as follows:

[0034] (1) Preparation of coating slurry:

[0035] Add sodium hydroxymethylcellulose into the deionized water, the specific ratio is 8g / L, then stir and heat to form a paste;

[0036] Put the ceramic aggregate in a certain proportion (mass fraction: 20% silica, 20% alumina, 20% titanium dioxide, 40% kaolin) into a ball mill jar and mill at 500r / min for 2-4h; then according to the weight percentage, mix 50 % ceramic aggregate, 5% tungsten carbide, 25% sodium silicate, and 5% sodium carbonate are mixed evenly, and the mixed powder is put into 15% prepared sodium hydroxymethyl cellulose aqueous solution, and the mass of sodium hydroxymethyl cellulose accounts for 5% of the total mass of the paint, after stirring and aging for 24 hours, the mixed slurry was obtained;

[0037] (2) Coat the slurry prepared in step (1) evenly on the...

Embodiment 3

[0039] Prepared coating 1 and coating 2 are carried out XRD phase analysis, the results are shown in figure 2 . Depend on figure 2 It can be seen that TiO exists in the coatings fired at 420 °C and 610 °C. 2 , Kaolin, SiO 2 and Al 2 o 3 and other phases, and the amorphous "steamed bread peak" appeared in the range of 20-30°, indicating that there is a CMS glass phase (CaO+MgO+SiO 2 )generate. With the increase of temperature, the "mantou peak" gradually disappeared, and the peaks corresponding to each substance became sharper, but no new phase was formed obviously.

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Abstract

The invention discloses ceramic paint used on the surface of steel. The ceramic paint is prepared from, by mass, 20-50% of ceramic aggregate, 2-10% of carbide wear-resisting and enhancing phase, 20-40% of binder and the balance water. The invention further provides a method for preparing the ceramic paint. According to the method, ceramic aggregate, carbide wear-resisting and enhancing phase, binder, cosolvent and thickener are blended to form coating slurry, the coating slurry is brushed or sprayed onto the surface of steel, heating is conducted to enable chemical reaction to be conducted between different components of the coating, and then the ceramic coating is prepared on the surface of heat-resistant steel through sintering. The coating has certain strength and tenacity and also has the advantages of ceramic materials of being resistant to high temperature, resistant to oxidation, resistant to corrosion and the like, and can be used for high-temperature anti-corrosion protection of heat-resistant steel in a thermal power plant.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a coating, in particular to a ceramic coating for steel surfaces and a preparation method thereof. Background technique [0002] The flue gas side corrosion of utility boilers is a very complicated process, which usually occurs on thermal components such as water walls, superheaters and reheaters. The main cause of high temperature corrosion on the flue gas side is impurities such as sulfur and alkali metals in coal , as well as the increase in tube wall temperature and the presence of a reducing atmosphere. As the proportion of low-quality coal and mixed coal in the coal-fired coal of power plants increases, the ash, corrosion and wear of the heating area of ​​the boiler are becoming more and more serious, resulting in more unit operation failures. As a common protective material, coating has been widely used in power stations. The preparation of ceramic coatings ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/10C04B35/46C04B33/04C04B33/13C04B35/63C04B35/636
Inventor 张大全夏铁锋高立新
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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