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Unburned carbon-free brick for generating MgAlON/beta-Sialon complex phase in situ under smelting condition

An in-situ generation and sialon complex phase technology, applied in the field of carbon-free refractory materials, can solve problems such as collapse, low strength of carbon-containing refractory materials, and overall strength decline

Active Publication Date: 2013-12-04
辽宁青花耐火材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in addition to adding carbon to molten steel, graphite-based carbon-containing refractory materials also have a fatal disadvantage: the strength of carbon-containing refractory materials is generally low. Once the oxidation amount exceeds a critical value, the overall strength of the material will drop significantly. even collapse

Method used

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  • Unburned carbon-free brick for generating MgAlON/beta-Sialon complex phase in situ under smelting condition
  • Unburned carbon-free brick for generating MgAlON/beta-Sialon complex phase in situ under smelting condition
  • Unburned carbon-free brick for generating MgAlON/beta-Sialon complex phase in situ under smelting condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Example 1: A non-fired carbon-free brick that uses smelting conditions to generate magnesia-alone / β-sialon complex phases in situ

[0067] (1) Raw material ratio

[0068] 98 fused magnesia (MgO≥98%, SiO 2 ≤1.5%, Fe 2 o 3 ≤1.5%, CaO≤1.5%) 60~70 parts,

[0069] MgO·Al 2 o 3 Spinel (2 o 3 ≥75%, MgO≥10%, SiO 2 ≤6%, Fe 2 o 3 ≤2%)

[0070] 5~10 copies,

[0071] Metal aluminum powder (<200 mesh Al≥97%) 6~12 parts,

[0072] Metal silicon powder (<200 mesh, Si≥97%) 3~5 parts,

[0073] Alumina micropowder (use BT-9300H laser particle size distribution analyzer to test the particle size, the median particle size of the raw material is D(50)=2.10μm, D90=4.08μm, Al 2 o 3 ≥98 ) 2~6 parts,

[0074] Magnesium aluminate cement (Al 2 o 3 ≥10%, MgO≥60%, SiO 2 ≤2%, Fe 2 o 3 ≤2%) 4~6 parts;

[0075] Among them: the composition of 98 fused magnesia is: 15 parts by weight with a particle size between 5 and 3 mm, 35 parts by weight with a particle size between 3 and 1 mm...

Embodiment 2

[0089] Example 2: A non-fired carbon-free brick that uses smelting conditions to generate magnesia-alone / β-sialon complex phases in situ

[0090] (1) Raw material ratio

[0091] 98 fused magnesia (MgO≥98%, SiO 2 ≤1.5%, Fe 2 o 3 ≤1.5%, CaO≤1.5%) 60 parts,

[0092] MgO·Al 2 o 3 Spinel (2 o 3 ≥75%, MgO≥10%, SiO 2 ≤6%, Fe 2 o 3 ≤2%)

[0093] 6 servings,

[0094] Metal aluminum powder (<200 mesh, Al≥97%) 10 parts,

[0095] Metal silicon powder (<200 mesh, Si≥97%) 4 parts,

[0096] Alumina micropowder (use BT-9300H laser particle size distribution analyzer to test the particle size, the median particle size of the raw material is D(50)=2.10μm, D90=4.08μm, Al 2 o 3 ≥98) 3 copies,

[0097] Magnesium aluminate cement (Al 2 o 3 ≥10%, MgO≥60%, SiO 2 ≤2%, Fe 2 o 3 ≤2%) 5 copies;

[0098] Among them: the composition of 98 fused magnesia is: 15 parts by weight with a particle size between 5 and 3 mm, 35 parts by weight with a particle size between 3 and 1 mm, and a pa...

Embodiment 3

[0106] Example 3: A non-fired carbon-free brick that uses smelting conditions to generate magnesia-alone / β-sialon complex phases in situ

[0107] (1) Raw material ratio

[0108] 97 fused magnesia (MgO≥97%, SiO 2 ≤1.5%, Fe 2 o 3 ≤1.5%, CaO≤1.5%) 60~70 parts,

[0109] MgO·Al 2 o 3 Spinel (2 o 3 ≥75%, MgO≥10%, SiO 2 ≤6%, Fe 2 o 3 ≤2%)

[0110] 5~10 copies,

[0111] Metal aluminum powder (<200 mesh, Al≥97%) 3~6 parts,

[0112] Metal silicon powder (<200 mesh, Si≥97%) 0~3 parts,

[0113] Alumina micropowder (use BT-9300H laser particle size distribution instrument to test the particle size, the median particle size of the raw material is D(50)=2.10μmD90=4.08μmAl 2 o 3 ≥98% 2~6 copies,

[0114] Magnesium aluminate cement (Al 2 o 3 ≥10%, MgO≥60%, SiO 2 ≤2%, Fe 2 o 3 ≤2%) 4~6 parts;

[0115] Among them: the composition of 97 fused magnesia is: 15 parts by weight with a particle size between 5 and 3 mm, 35 parts by weight with a particle size between 3 and 1 mm, ...

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Abstract

The invention discloses an unburned carbon-free brick for generating an MgAlON / beta-Sialon complex phase in situ under a smelting condition. According to the adopted technical scheme, the MgAlON / beta-Sialon complex phase consists of the following raw materials in parts by weight: 60-70 parts of fused magnesite, 5-10 parts of MaO.Al2O3 spinel with a fiber netlike structure, 3-12 parts of metal aluminum powder and 0-5 parts of metal silicon powder, 2-6 parts of aluminum oxide micro powder and 4-6 parts of a magnesium aluminate cementing agent; and the unburned carbon-free brick is prepared by mixing the raw materials above according to a certain weight proportion, molding and drying at 100-200 DEG C for 24-30 hours. Environmental protection is facilitated, the production period is shortened greatly, and production cost is reduced. An MgAlON / beta-Sialon complex phase refractory material is generated in situ under a smelting condition, and has the advantages of small linear expansion, low apparent porosity, high volume density, high thermal shock resistance, high erosion resistance, high scouring resistance, high oxidation resistance, self-repairing capacity and the like.

Description

technical field [0001] The invention relates to a carbon-free refractory material, in particular to a non-fired carbon-free brick in which magnesia-alone / β-sialon complex phases are formed in situ by using smelting conditions and a preparation method thereof. Background technique [0002] With the rapid development of modern ceramic materials, traditional refractory materials are developing in the direction of high technology, high performance, precision, and "functionalization", from oxide-based to composite refractory materials that emphasize both oxides and non-oxides . Proper combination of oxides and non-oxides can optimize the high temperature performance of the material, adjust and control the microstructure of the material according to different service conditions, improve and optimize the service performance of the material, so as to adapt to the use under high temperature and harsh environmental conditions. [0003] The successful application of MgO-C bricks in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 潘波余占国高心魁
Owner 辽宁青花耐火材料股份有限公司
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