Fouling and slagging resistance and high temperature and corrosion resistance ceramic paint and preparation and usage method thereof

A technology for high-temperature corrosion-resistant ceramic coatings, which is applied in the fields of anti-contamination and slagging and high-temperature corrosion-resistant ceramic coatings and its preparation. Formula components and ratios are unreasonable, etc., to achieve the effect of improving safety and economy, long service life and reasonable ratio

Inactive Publication Date: 2015-10-21
HANGZHOU CHITIAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing ceramic coatings have improved the contamination and slagging of the high-temperature furnace tubes of boilers and heating furnaces to a certain extent, but the ceramic coatings on the surface of the metal furnace tubes in the high-temperature environment in the furnace for a long time (generally no more than 3 years) have dust particles. The reasons are mainly due to the unreasonable formula components and ratio of ceramic coatings, large filler particle size, and unreasonable particle size matching between different filler components. It is caused by the combination of poor compatibility between filler and binder system, thicker coating thickness, and mismatch between the thermal expansion coefficient of ceramic coating and the thermal expansion coefficient of metal furnace tube.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] An anti-fouling, slagging and high-temperature corrosion-resistant ceramic coating, including fillers, binders, additives and water. The mass percentages of its components are: filler 20-30%, binder 23-29%, and additives 0.8-1.2%, the rest is water. Among them, the filler includes: 5-7% zirconium oxide, 3-5% boron nitride, 0.6-1% silicon nitride, 0.2-0.5% titanium nitride, 0.3-0.5% magnesium oxide, 1-1.5% chromium oxide, Copper oxide 0.5-1%, kaolin 5-7%, graphite 1-1.5%, mica 2-2.5%, nano-bentonite 0.5-0.7%, the rest are rare earths: scandium oxide 0.1-0.2%, cerium oxide 0.1-0.2% , Neodymium oxide 0.1-0.2%, lanthanum oxide 0.1-0.2%, yttrium oxide 0.1-0.2%, promethium oxide 0.1-0.2%, praseodymium oxide 0.1-0.2%, niobium oxide 0.1-0.2%, samarium oxide 0.1-0.2%; The binder includes: 15-19% silica sol, 5-7% acrylic resin emulsion, 3-5% aluminum phosphate; additives include: dispersant 0.3-0.4%, wetting agent 0.2-0.3%, defoamer 0.1 -0.2%, ammonia water 0.2-0.3%.

[0021] Fil...

Embodiment 2

[0027] The difference between this embodiment and the first embodiment is that the percentage of each component is different.

[0028] In this embodiment, the mass percentage of each component is: zirconium oxide 5%, boron nitride 3%, silicon nitride 0.6%, titanium nitride 0.2%, magnesium oxide 0.3%, chromium oxide 1%, copper oxide 0.5% %, Kaolin 5%, Graphite 1%, Mica 2%, Nano Bentonite 0.5%, Scandium Oxide 0.1%, Cerium Oxide 0.1%, Neodymium Oxide 0.1%, Lanthanum Oxide 0.1%, Yttrium Oxide 0.1%, Promethium Oxide 0.1%, Oxidized Praseodymium 0.1%, niobium oxide 0.1%, samarium oxide 0.1%; silica sol 15%, acrylic resin emulsion 5%, aluminum phosphate solution 3%; dispersant 0.3%, wetting agent 0.2%, defoaming agent 0.1%, ammonia 0.2% %; water 56.4%.

Embodiment 3

[0030] The difference between this embodiment and the first embodiment is that the percentage of each component is different.

[0031] In this embodiment, the mass percentage of each component is: zirconium oxide 6%, boron nitride 4%, silicon nitride 0.8%, titanium nitride 0.35%, magnesium oxide 0.4%, chromium oxide 1.25%, copper oxide 0.75 %, kaolin 6%, graphite 1.25%, mica 2.25%, nano bentonite 0.6%, scandium oxide 0.15%, cerium oxide 0.15%, neodymium oxide 0.15%, lanthanum oxide 0.15%, yttrium oxide 0.15%, promethium oxide 0.15%, oxidation Praseodymium 0.15%, niobium oxide 0.15%, samarium oxide 0.15%; silica sol 17%, acrylic resin emulsion 6%, aluminum phosphate solution 4%; dispersant 0.35%, wetting agent 0.25%, defoaming agent 0.15%, ammonia 0.25 %; water 47.25%.

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Abstract

The invention relates to a fouling and slagging resistance and high temperature and corrosion resistance ceramic paint and a preparation and usage method thereof. The ceramic paint comprises, by mass, the components of 20-30% of filler, 23-29% of binders, 0.8-1.2% of addition agents and the balance water. According to the ceramic paint, the formula component and ratio are reasonable, the filler granularity is small, granularity matching among different filler components is reasonable, and the matching compatibility of the filler and a binder system is good. A ceramic coating prepared by spray coating can resist high temperature 1320 DEG C, is thinner, has the functions of resisting fouling and slagging and resisting high temperature and corrosion, and cannot be pulverized and fall off in a long-term high-temperature operating environment; the high emissivity above 0.95 can be still kept at high temperature and is close to the thermal expansion coefficients of metal, and heat transfer can be enhanced; the coating integrates chemical inertness and passivation protection into a body, and therefore a high-temperature corrosion environment is prevented from corroding the metal through the compact ceramic coating; meanwhile, due to the fact that the coating has the self-cleaning effect, the coating can be applied easily and conveniently.

Description

Technical field [0001] The invention relates to a ceramic coating and a preparation and use method thereof, in particular to an anti-fouling slagging and high temperature corrosion resistance ceramic coating and a preparation and use method thereof, belonging to the field of ceramic coatings and preparation and use. Background technique [0002] For a long time, the carbon steel and alloy steel metal furnace tubes of coal, oil, gas and biomass-fueled power industry boilers, petroleum and petrochemical industry heating furnaces, and small and medium-sized industrial boilers have been subjected to combustion in the high-temperature operating environment of the furnace. The product alkali metal oxides and corrosive gases on the surface of the furnace tube are contaminated, slagging, and high-temperature corrosion. Especially in recent years, with the widespread adoption of low-nitrogen combustion technology, it has also increased the reducing atmosphere in some areas of the furnace. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/34C04B14/30C04B14/32
Inventor 常伟常虹赵凯
Owner HANGZHOU CHITIAN ENERGY TECH CO LTD
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