Analyze ways to improve the physical and chemical properties of ladle air-permeable bricks (1)

Breathable bricks are classified according to their materials. Luoyang firstfurnace@gmil.com Co., Ltd. has been focusing on the development, production and sales of air-permeable bricks for 17 years, and is a professional manufacturer of air-permeable bricks.

(Picture) Luoyang firstfurnace@gmil.com Co., Ltd. patented product FS series slit-type air-permeable brick

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Many steel mills are troubled by the inefficiency and high consumption caused by frequent replacement of the ventilating bricks due to the problems of steel seepage and peeling in the slits of the ventilating bricks. learn from past experience. Based on the analysis of the damage factors of the remaining bricks, this paper proposes methods to improve the physical and chemical properties of the ventilating bricks, avoiding stepping into the minefields stepped on by the predecessors, and producing safer and more efficient ventilating bricks.

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1. Choose tabular corundum as raw material

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Tabular corundum is a pure sintered corundum that does not add any additives such as MgO, B2O3, and is completely fired and shrinks. Its special hexagonal plate-shaped α-Al2O3 mineral phase structure can greatly improve the thermal volume stability of the breathable brick And thermal shock resistance.

When fast sintering, the coarse crystals formed by the recrystallization of α-Al2O3 contain small round sealed spherical pores, and there are many closed pores. The porosity is roughly equivalent to that of fused corundum, with high purity, good volume stability, and extremely small weight. Burning shrinkage, so the refractory or castable produced by it has strong thermal shock stability and flexural strength after high temperature treatment.

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2. Add rare metal zirconium

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Zirconium has amazing corrosion resistance, extremely high melting point, ultra-high hardness and strength. Because it has a special structure. There are many variations of its crystal form, monoclinic crystal system at low temperature, tetragonal crystal form at high temperature, and cubic crystal form at higher temperature. When the monoclinic crystal is heated to 1170°C, it transforms into a tetragonal crystal form, and when heated to 2370°C, it transforms into a cubic crystal form. The melting point of zirconium is above 1800 degrees, and the melting point of zirconium dioxide is even higher than 2700 degrees.

Aiming at the situation that the air-permeable brick is damaged by thermal spalling caused by the thermal stress caused by the huge temperature difference (the steel ladle is baked before use, the temperature of the converter steel rises sharply, and the temperature drops sharply after the steel is poured), by adding pre-synthesized zirconium-based materials through Change the physical and chemical properties of the air-permeable brick, thereby greatly improving the thermal stability of the air-permeable brick. This is because although corundum-based materials and zirconium-based materials have different thermal expansion coefficients, microcracks will occur at high temperatures, but the cracks can absorb and disperse the energy of the main crack and disperse the problem of stress concentration, thereby inhibiting the propagation of cracks, plus ZrO2 itself has toughening properties, and the toughness of ventilated bricks can be significantly improved.

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in conclusion

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Selecting plate-shaped corundum and adding rare metal materials that can improve the toughness of the ventilating brick can significantly improve the thermal spalling and erosion resistance of the ventilating brick, and greatly improve the thermal stability and thermal shock resistance of the brick. Luoyang firstfurnace@gmil.com Co., Ltd. focuses on the research and development, production, sales and use of ventilating bricks. It is a professional manufacturer of ventilating bricks. Welcome to call us for details.