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A kind of high temperature anti-corrosion coating material and its use method and application

An anti-corrosion coating and anti-corrosion technology, applied in the field of high-temperature anti-corrosion coating materials, can solve the problems of poor resistance to acid and alkali corrosion and slag corrosion, limiting the application range of ceramic fiber boards, and poor surface strength of ceramic fiber boards, etc. To achieve the effect of good matching of thermal expansion coefficient with the matrix, improving corrosion resistance and improving structural compactness

Inactive Publication Date: 2018-07-10
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors of the present application have found that the use of existing ceramic fiber boards as refractory materials for the heating surface of the furnace has at least the following disadvantages: first, the existing ceramic fiber boards have poor surface strength and are prone to slag; second, the existing ceramic fiber boards are resistant to Acid-base corrosion and slag corrosion resistance are poor, and it is very easy to be corroded by acidic or alkaline substances, causing powdering and falling off, so this greatly limits the application range of existing ceramic fiberboards in industrial kilns

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] Further, the preparation method of the high-temperature anti-corrosion coating material may include the following steps:

[0028] A. Steps for preparing anti-corrosion powder: Weigh magnesium aluminum spinel powder and white corundum powder respectively according to the weight ratio in the above technical scheme, and put them into a ball mill jar for ball milling until the desired particle size distribution is obtained corrosion-resistant powder.

[0029] B. Steps for preparing colloid:

[0030] ① Steps for preparing modified alumina sol: fully stir the hydrated alumina nanopowder accounting for 2% to 5% of the total weight of the modified alumina sol with an appropriate amount of deionized water, and then add 0% to 3% by weight of alumina nano-powder with an average particle size of 20 to 35 nanometers is fully stirred, then add transparent alumina sol with an alumina content of 8% to 20% (by weight percentage), and fully stir Mix evenly, and finally configure a modi...

Embodiment 1

[0042] A method for preparing a high-temperature anti-corrosion coating material, comprising the steps of:

[0043] a1. Steps for preparing anti-corrosion powder: Weigh 9 kg of magnesia-aluminum spinel powder with a particle size of 325 mesh, and 1 kg of white corundum powder with an average particle size of 5 microns, and put it into an alumina ball mill tank, After about 8 hours of ball milling, the anti-corrosion powder material can be obtained. The particle size of the anti-corrosion powder is all less than 50 microns, the average particle size is less than 10 microns, and the anti-corrosion powder with a particle size of less than 2 microns accounts for at least 20% of the total weight of all anti-corrosion powders.

[0044] b1, the step of preparing modified alumina sol: fully stir and mix 1 kg of hydrated alumina nanopowder with 9 kg of deionized water, then add 10 kg of transparent alumina sol with an alumina content of 10% (by weight percentage), After fully stirring...

Embodiment 2

[0048] A method for preparing a high-temperature anti-corrosion coating material, comprising the steps of:

[0049] a2. Steps for preparing anti-corrosion powder: Weigh 8 kg of magnesia-aluminum spinel powder with a particle size of 325 mesh and 2 kg of white corundum powder with an average particle size of 5 microns, put them into an alumina ball mill tank, and ball mill After about 8 hours, a corrosion-resistant powder material was obtained. The particle size of the anti-corrosion powder is all less than 50 microns, the average particle size is less than 10 microns, and the anti-corrosion powder with a particle size of less than 2 microns accounts for at least 20% of the total weight of all anti-corrosion powders.

[0050] b2. Steps for preparing modified alumina sol: Pour 1kg of hydrated alumina nanopowder and 0.3kg of alumina nanopowder with an average particle size of 30nm into 9kg of deionized water respectively, fully stir and mix evenly, and then add 9.7 kg of transpa...

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Abstract

The invention discloses a high-temperature anti-corrosion coating material and its use method and application. The high-temperature anti-corrosion coating material is mixed with anti-corrosion powder and colloid according to the weight ratio of 1:1 to 1:2; wherein , the anti-corrosion powder is composed of magnesium aluminum spinel powder and white corundum powder, the total weight of magnesium aluminum spinel powder accounts for 70% to 98% of the total weight of the anti-corrosion powder, white corundum The total weight of the powder accounts for 2%-30% of the total weight of the corrosion-resistant powder; the colloid is modified alumina sol or modified zirconia sol. The coating material provided by the invention not only has the advantages of compact structure, high surface strength, high temperature resistance and good corrosion resistance, but also has strong bonding ability with the substrate, good thermal shock resistance, and is not easy to fall off. It is suitable for coating in industrial kilns. The surface of the furnace lining is used as the refractory material for the heating surface of the furnace.

Description

technical field [0001] The invention relates to the field of high-temperature anti-corrosion coating materials, in particular to a high-temperature anti-corrosion coating material for industrial kiln lining and its use method and application. Background technique [0002] Ceramic fiber (for example: alumina, aluminum silicate, etc.) is a kind of lightweight refractory material with the characteristics of light bulk density, good thermal stability, low thermal conductivity, small heat capacity, good resistance to mechanical vibration, and easy cutting and processing. In recent years, with the continuous improvement of the quality of ceramic fiber boards, more and more industrial kilns use ceramic fiber boards to replace traditional refractory bricks as refractory materials for the heating surface of the furnace. However, the inventors of the present application have found that the use of existing ceramic fiber boards as refractory materials for the heating surface of the furn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/443C04B35/63C04B35/66
Inventor 戴建明郭帅史鹰朝胡小林
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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