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Production method of composite material of light mullite brick and silicon carbide coating

A technology of mullite and refractory bricks, which is applied in the field of composite materials of mullite lightweight bricks and silicon carbide coatings and its manufacture, can solve the problems of not considering the combination of mullite lightweight refractory bricks and sealing open pores, Achieve the effects of solving compatibility problems, prolonging service life, and high emissivity

Active Publication Date: 2013-03-06
JIANGSU ZHONGLEI ENERGY SAVING TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the results of this study did not use silicon carbide coatings, nor did they consider the combination with mullite lightweight refractory bricks and the issue of sealing open pores

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The composition of the silicon carbide coating material is 70% of silicon carbide, 20% of petroleum coke, and 10% of fused corundum. The composition of silicon carbide is calculated by weight percentage: SiC 99.31%, Fe 0.08%, free C 0.21%, free Si 0.18%, and others 0.22%. The composition of petroleum coke in weight percent is: total C 94.69%, SiO 2 0.10%, Al 2 O3 0.04%, S 0.30%, volatile matter 4.81%, other 0.06%. The composition of fused corundum is calculated by weight percentage: Al 2 O3 99.06%, SiO 2 0.29%, Fe 2 O30.10%, Na 2 O 0.10%, K 2 O0.03%, CaO 0.03%, MgO 0.03%, TiO 2 0.21%, other 0.18%. The chemical composition of the mullite lightweight refractory bricks used is: Al 2 O3 73.19%, SiO 2 25.72%, TiO 2 0.33%, Fe 2 O3 0.41%, Na 2 O 0.10%, K 2 O 0.03%, CaO 0.05%, MgO 0.04%, others 0.13%. The phase composition of the mullite lightweight refractory brick used: mullite 95.88%, corundum 4.06%, other 0.06%; the bulk density of the mullite lightweight ref...

Embodiment 2

[0013] The silicon carbide coating material consists of 80% silicon carbide, 15% petroleum coke, and 5% fused corundum. Among them, the composition of silicon carbide is calculated by weight percentage: SiC 98.87%, Fe 0.09%, free C 0.38%, free Si 0.42%, and others 0.24%. The composition of petroleum coke in weight percent is: total C 90.17%, SiO 2 0.08%, Al 2 O3 0.05%, S 0.41%, volatile matter 9.21%, other 0.08%. The composition of fused corundum is calculated by weight percentage: Al 2 O3 99.06%, SiO 2 0.29%, Fe 2 O30.10%, Na 2 O 0.10%, K 2O0.03%, CaO 0.03%, MgO 0.03%, TiO 2 0.21%, other 0.18%. The chemical composition of the mullite lightweight refractory bricks used is: Al 2 O3 73.19%, SiO 2 25.72%, TiO 2 0.33%, Fe 2 O3 0.41%, Na 2 O 0.10%, K 2 O 0.03%, CaO 0.05%, MgO 0.04%, others 0.13%. The phase composition of the mullite lightweight refractory brick used: mullite 95.88%, corundum 4.06%, other 0.06%; the bulk density of the mullite lightweight refractory b...

Embodiment 3

[0015] The composition of the silicon carbide coating material is 75% of silicon carbide, 15% of petroleum coke, and 10% of fused corundum. Among them, the composition of silicon carbide is calculated by weight percentage: SiC 98.87%, Fe 0.09%, free C 0.38%, free Si 0.42%, and others 0.24%. The composition of petroleum coke in weight percent is: total C 90.17%, SiO 2 0.08%, Al 2 O3 0.05%, S 0.41%, volatile matter 9.21%, other 0.08%. The composition of fused corundum is calculated by weight percentage: Al 2 O3 99.06%, SiO 2 0.29%, Fe 2 O30.10%, Na 2 O 0.10%, K 2 O0.03%, CaO 0.03%, MgO 0.03%, TiO 2 0.21%, other 0.18%. The chemical composition of the mullite lightweight refractory bricks used is: Al 2 O3 77.19%, SiO 2 22.11%, TiO 2 0.25%, Fe 2 O3 0.26%, Na 2 O 0.03%, K 2 O 0.02%, CaO 0.09%, MgO 0.05%, others 0.17%. The phase composition of the mullite lightweight refractory brick used: mullite 93.81%, corundum 6.15%, other 0.08%; the bulk density of the mullite lig...

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Abstract

The invention belongs to the field of a refractory material, in particular to a composite material of a light mullite brick and a silicon carbide coating and a production method of the composite material, which is characterized in that the silicon carbide coating comprises 70 to 80% of silicon carbide, 15 to 20% of petroleum coke and 5 to 10% of electriccorundum; the coating powder uniformly mixed is coated on the counter-firing working surface of the light mullite refractory brick by adopting a plasma coating machine so as to prepare the composite material of the light mullite refractory brick and the silicon carbide coating by controlling the thickness of the coating between 200 mu m to 500 mu m. When the prepared composite material is compared with the non-composite light mullite refractory brick, the heat conductivity at 1000 DEG C perpendicular to the surface of the coating can be reduced by 20% to 30%,the heat conductivity is greatly reduced, and the composite material plays an important role in reducing the heat loss of the high-temperature coal gas recovery pipeline of a large-sized coke oven. The carburization resistance of the light mullite refractory brick is greatly improved, and the service life can be effectively prolonged because of the good sealing function of the coating.

Description

technical field [0001] The invention belongs to the field of refractory materials, in particular to a composite material of mullite lightweight brick and silicon carbide coating and a manufacturing method thereof. Background of the invention [0002] The pipelines used for high temperature gas recovery of large coke ovens need to use mullite lightweight refractory bricks with low thermal conductivity and high carburization resistance as lining materials. However, the heat insulation performance and carburization resistance of the existing mullite lightweight refractory bricks cannot well meet the actual needs of the coke oven high-temperature gas recovery pipeline lining, resulting in a relatively large heat loss of the pipeline and a relatively long service life of the lining. short. The main problem of the unsatisfactory thermal insulation performance of mullite lightweight refractory bricks is that its macroscopic pores and the main crystal phase of mullite itself have l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85C04B35/66
Inventor 徐广平宋一华何江荣刘秋兰
Owner JIANGSU ZHONGLEI ENERGY SAVING TECH DEV CO LTD
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