Al2O3-SiC-C refractory brick for torpedo ladles and preparation method thereof

A technology of al2o3-sic-c and refractory bricks, which is applied in the field of Al2O3-SiC-C refractory bricks for torpedo tanks and its preparation, can solve problems such as thermodynamic imbalance and reduce the service life of SiC-C bricks, so as to improve the service life , enhance the oxidation resistance, improve the effect of hot state strength

Inactive Publication Date: 2014-02-26
河南海格尔高温材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Al for traditional torpedo tanks 2 o 3 -SiC-C brick is a resin-bonded non-fired brick. It is directly used after low-temperature baking. It belongs to a carbon-bonded state. The inside of the brick is in a state of thermodynamic imbalance. Al 2 o 3 -The thermal strength, erosion resistance and high temperature volume stability of SiC-C bricks reduce the Al 2 o 3 - Service life of SiC-C bricks

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0018] Al 2 o 3 -The preparation method of SiC-C refractory brick, comprises the steps:

[0019] (1) Mixing: First, mix the super-grade bauxite clinker and corundum particles in the forced mixer for 5-10 minutes, then add phenolic resin into the forced mixer and mix for 5-10 minutes, then add The natural flake graphite is then mixed and milled for 5-10 minutes, and finally corundum fine powder, SiC fine powder, alumina micro-powder and Si powder are added, and then mixed and milled for 10-20 minutes to make a mixture and set aside;

[0020] (2) Forming: press the mixed material after step (1) on a brick press to form it, then bake the formed brick at 200°C for 24 hours, and take it out for later use;

[0021] (3) Nitriding treatment: Place the refractory bricks baked at low temperature in step (2) in a nitriding furnace, keep the partial pressure of nitrogen in the nitriding furnace at 0.1~0.2MPa, and fire at 1400~1450°C 36~72h, then naturally cooled to room temperature to ...

Embodiment 1

[0023] Al for torpedo tanks 2 o 3 - SiC-C refractory bricks, in parts by weight, its raw material composition is: 30 parts by weight ratio of 25:10:20 special-grade bauxite clinker with particle diameters of 3~5mm, 1~3mm and 0~1mm respectively , 20 parts of brown corundum particles with a particle size of 0.2~1mm, 3 parts of phenolic resin, 15 parts of brown corundum fine powder with a particle size of 325 mesh, 12 parts of SiC fine powder with a particle size of 200 mesh, and 3 parts of a particle size of 1~5μm Alumina fine powder, 10 parts of natural flake graphite with a particle size of 100 mesh and 4 parts of Si powder with a particle size of 200 mesh; 3 N 4 、Si 2 N 2 O and Sialon non-oxide reinforcing phases.

[0024] Al 2 o 3 - The preparation method of SiC-C refractory bricks is as follows: firstly mix the special-grade bauxite clinker and corundum particles in the forced mixer for 5 minutes, then add phenolic resin into the forced mixer and mix for 5 minutes, t...

Embodiment 2

[0026] Al for torpedo tanks 2 o 3 - SiC-C refractory bricks, in terms of parts by weight, its raw material composition is: 25 parts of super-grade bauxite clinker with a weight ratio of 30:10:15 and particle sizes of 3~5mm, 1~3mm and 0~1mm respectively , 25 parts of fused white corundum particles with a particle size of 0.2~1mm, 3 parts of phenolic resin, 12 parts of fused white corundum fine powder with a particle size of 200 mesh, 15 parts of SiC fine powder with a particle size of 325 mesh, and 5 parts of Alumina fine powder of 1-5 μm, 8 parts of natural flake graphite with a particle size of 100 mesh and 2 parts of Si powder with a particle size of 325 mesh; Si is generated inside the refractory brick 3 N 4 、Si 2 N 2 O and Sialon non-oxide reinforcing phases.

[0027] Al 2 o 3- The preparation method of SiC-C refractory bricks is as follows: firstly mix the special-grade bauxite clinker and corundum particles in the forced mixer for 10 minutes, then add phenolic res...

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Abstract

The invention discloses an Al2O3-SiC-C refractory brick for torpedo ladles and a preparation method thereof, which relate to the fields of refractory bricks and preparation methods thereof. The refractory brick is composed of the following raw materials in parts by weight: 25-35 parts of super bauxite clinker, 15-25 parts of corundum particles with a particle size of 0.2-1 mm, 3-5 parts of a phenolic resin, 12-18 parts of fine corundum powder, 10-15 parts of fine SiC powder, 3-5 parts of alumina micro-powder with a particle size of 1-5mu m, 8-15 parts of natural flake graphite and 2-4 parts of Si powder; and Si3N4, Si2N2O and Sialon nonoxide reinforced phases are generated in the refractory brick. The preparation method of the refractory brick comprises the steps of material mixing, forming and nitriding treatment. Compared with traditional Al2O3-SiC-C bricks for torpedo ladles, the Al2O3-SiC-C refractory brick for torpedo ladles disclosed by the invention can significantly improve the hot strength, scour resistance and thermal shock resistance of a brick body.

Description

technical field [0001] The invention relates to the field of refractory bricks and preparation methods thereof, in particular to an aluminum alloy for torpedo cans 2 o 3 -SiC-C refractory brick and its preparation method. Background technique [0002] The refractory bricks for torpedo tanks are mainly Al 2 o 3 -SiC-C material, in order to adapt to the working environment of different areas in the torpedo tank, its composition is slightly adjusted in the impact area, slag line area and iron line area in the torpedo tank. According to the service conditions of the torpedo tank, the Al used in the lining is frequently used in the process of receiving molten iron and pouring molten iron. 2 o 3 -SiC-C refractory bricks are mainly damaged by molten iron erosion, slag erosion and thermal shock damage. Therefore, Al 2 o 3 -SiC-C bricks especially need to have high thermal shock resistance, hot strength and slag erosion resistance. [0003] Al for traditional torpedo tanks 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 毕振勇李纪伟王崇江周传臣李天学
Owner 河南海格尔高温材料有限公司
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