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High-temperature wearable composite dope for electric power boiler flue

A high-temperature wear-resistant, composite coating technology, used in coatings, combustion product treatment, exhaust gas devices, etc., can solve the problem of high-temperature volume stability, erosion resistance and wear resistance, and acid gas corrosion resistance Reduce, liner deformation and wear resistance and other issues, to achieve the effect of improving high temperature volume stability and wear resistance, reducing the number of repairs and maintenance, and improving high temperature performance

Inactive Publication Date: 2008-08-13
LUOYANG KENAI HIGH TEMPERATURE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the plasticity and facilitate the construction, a large amount of raw clay is added to the plastic, thereby introducing a large amount of impurity elements, resulting in a decrease in the high temperature performance of the material
A large amount of liquid phase is generated at high temperature, causing the deformation of the lining and the decrease of wear resistance, and the erosion is intensified, which restricts the service life of the lining
However, the high-alumina low-cement castable uses high-alumina bauxite as the main raw material, introduces some silica powder and 5-8% high-alumina cement, the corrosion resistance of acid gas is reduced, and more CaO- is formed in the material under high temperature conditions. SiO 2 -Al 2 o 3 Liquid phase, which affects the high temperature volume stability, corrosion resistance and wear resistance of the material, and has a low service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The high-temperature wear-resistant composite coating for electric boiler flue of the present invention contains the following components and contents calculated by mass percentage:

[0033] The granular raw material is super high bauxite, the particle size is 5-3mm, and the addition amount is 15%.

[0034] The raw material of the particles is sub-white corundum, the particle size is 3-1mm, the addition amount is 30%, and the particle size is 1-0mm, the addition amount is 20%.

[0035] The addition amount of white corundum fine powder with a particle size of 200 mesh is 3.0%

[0036] Bimodal α-Al 2 o 3 Micro-powder and nano-silica micro-powder are compounded, and the addition amount is 10%;

[0037] Reinforced particle material is boron carbide CB 4 The addition amount is 5%;

[0038] The binder is hydrated alumina p-Al 2 o 3 The addition amount is 4%;

[0039] The admixture is FDN and sodium hexametaphosphate, and the addition amount is 1.0%;

[0040] The addi...

Embodiment approach 2

[0051] The high-temperature wear-resistant composite coating for electric boiler flue of the present invention contains the following components and contents calculated by mass percentage:

[0052] Granular raw materials are two composites of brown corundum and tabular corundum, with a particle size of 5-3mm, adding 20%; for a particle size of 3-1mm, adding 30%; for a particle size of 1-0mm, adding 20% ​​white corundum fine powder 320 Adding amount is 2.0%

[0053] Chromium Oxide Cr 2 o 3 Micropowder, two composites of silicon carbide SiC micropowder, the addition amount is 7%;

[0054] The reinforcing particle material is titanium boride TiB 2 , zirconium boride ZrB 2 The two kinds of composites, the addition amount is 3%;

[0055] The binder is Lafarge cement Secar71 and the addition of pure calcium aluminate cement is 6%;

[0056] The admixture is two kinds of compound (addition) of sodium tartrate and sodium pyrophosphate, and the addition amount is 0.25%;

[0057] ...

Embodiment approach 3

[0062] The high-temperature wear-resistant composite coating for electric boiler flue of the present invention contains the following components and contents calculated by mass percentage:

[0063] The granular raw material is three composites of super-grade high-bauxite, sintered mullite, and sub-white corundum. The dosage is 20% for particle size 5-3mm, 32% for particle size 3-1mm, and 16% for particle size <1.0mm. %;

[0064] The powder is chromium oxide Cr 2 o 3 Micropowder, silicon carbide SiC micropowder, and multimodal alumina micropowder are compounded of three kinds, the addition amount is 15%;

[0065] Reinforced particle material is boron carbide CB 4 , silicon nitride Si 3 N 4 1. Three kinds of composites of silicon carbide SiC hard particles, the addition amount is 2.0%;

[0066] The binder is Lafarge cement Secar71, pure calcium aluminate cement, and bauxite cement, and the addition amount is 8%;

[0067] The admixture is three compounds of sodium hexameta...

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Abstract

The invention relates to a high-temperature wear-resistant composite coating for the flue of an electrical furnace, belonging to the high-temperature coating field. The invention enhances the strength and toughness of the material, improves the high-temperature performance of the material and forms mullite net compound structure under high temperature condition by using modern composite material principle and a coupling method by particle enhancing and fiber toughness increasing and adding high-performance material and using nano-compound powder as bonding and using hard high-strength particle as enhancer, further, the invention can also improves the volume stability and the rear resistant performance in high temperature, and prolongs service life. The invention is especially suitable for the flue of a furnace, and has the advantages of high refractoriness, wear-resistant performance, excellent high temperature performance, stable volume, high strength, good toughness, prolonging service life of the material, reducing maintenance times for the flue, and labor saving.

Description

technical field [0001] The invention relates to the technical field of high-temperature coatings, in particular to a high-temperature wear-resistant composite coating for electric boiler flues, which is suitable for boiler flues. Background technique [0002] At present, the boiler flue is an important equipment for conveying boiler combustion exhaust gas. Exhaust gas mainly contains N 2 , CO 2 , SO 2 , NO 2 And other gases, the use temperature is 1000 ~ 1400 ℃. Due to the high temperature, the exhaust gas contains a large amount of acidic components, and the exhaust gas contains a certain amount of fly ash particles, which will cause serious erosion and wear to the flue. Now the flue lining mainly uses high-aluminum phosphate plastic and high-alumina low-cement castables. In order to improve plasticity and facilitate construction, a large amount of raw clay is added to the plastic, thereby introducing a large amount of impurity elements, resulting in a decrease in the...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D5/00F23J13/02
Inventor 李延会李会玲化运坡姬会杰
Owner LUOYANG KENAI HIGH TEMPERATURE MATERIAL
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