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Ceramic Al203SiC refractory and preparation method thereof

An al2o3-sic, ceramic technology, applied in the field of refractory materials, can solve the problems of high porosity of refractory bricks, reduced service performance, deterioration of brick quality, etc., to achieve the effects of low porosity, prolong service life, and slow down corrosion loss

Inactive Publication Date: 2007-10-03
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In short, in terms of material selection, high alumina bauxite clinker, white corundum, brown corundum, sub-white corundum, graphite (C), industrial silicon carbide and other materials are commonly used at home and abroad; from the perspective of high temperature resistance, these materials All can meet the requirements of use. The problem is that the porosity of the refractory bricks prepared according to the above-mentioned brick-making method is relatively large, and it is easy to slag seepage, or the oxidation of graphite (C) causes the quality of the bricks to deteriorate and reduce the performance.

Method used

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Examples

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Effect test

Embodiment 1

[0013] Example 1 A ceramic Al 2 o 3 -SiC refractory brick and its preparation method, the weight percentage of its components is: Al 2 o 3 The content of high alumina bauxite clinker with content ≥85% is 55-70%, Al 2 o 3 Andalusite with content ≥ 52% is 5-10%, industrial silicon carbide with SiC content ≥ 95% is 10-17%, Al 2 o 3 White corundum content ≥ 97% is 3-10%, Al 2 o 3 Brown corundum with a content ≥ 92.5% is 0-8%, ceramic additives 3-5%, plus 1.0-2.5% binder and 3.5-4.5% water, stirred or mixed for 10-25 minutes and then pressed into shape; Dry at 60-110°C for 20-24 hours, and then burn at 1430-1450°C for 4-6 hours.

[0014] In this example, the particle gradation of each component is: 5-0 mm for high alumina bauxite clinker, 1-0 mm for white corundum, 3-0 mm for brown corundum, 1-0 mm for industrial silicon carbide, and 1-0 mm for andalusite 1 ~ 0mm, the ceramic additive is 8 ~ 0μm.

[0015] The ceramic additive in this embodiment is a homogeneous mixture of...

Embodiment 2

[0017] Example 2 A ceramic Al 2 o 3 -SiC refractory brick and its preparation method, the weight percentage of its components is: Al 2 o 3 High alumina bauxite clinker with content ≥85% is 55-75%, Al 2 o 3 Andalusite with content ≥ 52% is 5-10%, industrial silicon carbide with SiC content ≥ 95% is 10-17%, Al 2 o 3 Brown corundum with a content ≥92.5% is 5-10%, ceramic additives 3-5%, plus 1.5-2.5% binder and 3.5-5.0% water, stirred or mixed for 10-25 minutes, then pressed into shape, and then Dry at 60-110°C for 20-24 hours, and then burn at 1430-1450°C for 4-6 hours.

[0018] In this embodiment, the particle gradation of each component is: high alumina bauxite clinker is 5-0mm, brown corundum is 3-0mm, industrial silicon carbide is 1-0mm, andalusite is 1-0mm, ceramic additive is 8~0μm.

[0019] The ceramic additive of the present embodiment 2 is a homogeneous mixture of activated alumina, boehmite and montmorillonite; its weight percentage is that activated alumina is...

Embodiment 3

[0021] Embodiment 3 a kind of ceramic Al 2 o 3 -The preparation method of SiC refractory bricks is that the weight percentage of its components is: Al 2 o 3 High alumina bauxite clinker with content ≥ 85% is 50-65%, industrial silicon carbide with SiC content ≥ 95% is 10-17%, Al2 o 3 White corundum content ≥ 97% is 5-15%, Al 2 o 3 Brown corundum with a content ≥92.5% is mixed with 3-15% and ceramic additives 3-5%, plus 1.5-2.5% binder and 3.5-4.5% water, stirred or mixed for 10-25 minutes and then pressed into shape , and then dried at 60-110°C for 20-24 hours, and then fired at 1430-1450°C for 4-6 hours.

[0022] The particle gradation of each component in this example is: 5-0mm for high alumina bauxite clinker, 1-0mm for white corundum, 3-0mm for brown corundum, 1-0mm for SiC, and 8-0μm for ceramic additives .

[0023] The ceramic additive is a homogeneous mixture of activated alumina, boehmite and montmorillonite; its weight percentage is 30-40% of activated alumina,...

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Abstract

A refractory ceramic Al2O3-SiC brick with high strength and low porosity is prepared through proportionally mixing high-Al alumine, white corundum, brown corundum, industrial silicon carbide, andalusite, ceramic additive, adhesive and water, stirring or grinding, die pressing, drying at 60-110 deg.C for 12-24 hr or natural drying, and calcining at 1400-1470 deg.C.

Description

technical field [0001] The invention belongs to the field of refractory materials with high alumina bauxite, white corundum, brown corundum, silicon carbide and andalusite as base materials. Especially related to a ceramic Al 2 o 3 -SiC refractory brick and its preparation method. Background technique [0002] The equipment for smelting, storing and transporting high-temperature molten iron includes ironmaking blast furnaces, tapping troughs, mixed iron tanks (torpedo tanks) and molten iron tanks, mixed iron furnaces and iron furnaces, etc. The lining of these equipment used to be made of clay bricks , High alumina brick masonry. With the application of new metallurgical technologies such as intensified smelting and hot metal pretreatment based on desulfurization, the erosion of the lining brick by molten iron has been intensified, and the use conditions of the lining brick are significantly harsh. This kind of clay bricks and high alumina bricks are not only gradually e...

Claims

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Application Information

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IPC IPC(8): C04B35/63C04B35/64C04B35/66C04B35/10
Inventor 祝洪喜邓承继白晨刘奎然白中兴白周义钟喜庆
Owner WUHAN UNIV OF SCI & TECH
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