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Thermal-shock-resistant magnesian sliding plate brick and production method thereof

A technology for sliding bricks and thermal shock resistance, which is applied in the direction of casting molten material containers, manufacturing tools, metal processing equipment, etc., and can solve the problems of large thermal expansion coefficient of magnesia particles, weak bonding strength between particles and matrix, and affecting thermal shock resistance, etc. , to achieve the effect of promoting green manufacturing, significant economic and environmental benefits, and increasing service life

Inactive Publication Date: 2020-11-20
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a heat-resistant Vibration magnesia slide brick and production method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] Embodiment: A thermal shock resistant magnesia sliding brick, characterized in that, by weight percentage, the raw material composition of the sliding brick is: 55% to 70% of modified magnesia particles, 30% to 45% of magnesia micropowder , Pulp waste liquid 3% to 5%.

[0025] The α-Al mentioned above 2 o 3 A method for preparing a thermal shock resistant magnesia sliding brick with micropowder coated modified magnesia particles, the specific steps are as follows:

[0026] A. α-Al 2 o 3 Preparation of micropowder-coated modified magnesia particles:

[0027] a. First add the magnesia particles into the mixer and stir for 1-2 minutes to obtain the mixture A;

[0028] b. After stirring evenly, add 2% to 4% by weight of the binder of the mixture A and continue to stir for 2 to 3 minutes to obtain the mixture B. The binder is a saturated solution of aluminum chloride or aluminum sulfate;

[0029] c. After stirring evenly, slowly add α-Al with D50=1~3µm 2 o 3 Continue...

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Abstract

The invention discloses a thermal-shock-resistant magnesian sliding plate brick which is prepared from the following raw materials in percentage by weight: 55-70% of modified magnesia particles, 30-45% of magnesia fine powder and 3-5% of paper pulp waste liquid. The preparation method comprises the following steps: firstly, preparing alpha-Al2O3 micro-powder coated modified magnesia particles by taking a saturated solution of aluminum chloride or aluminum sulfate as a binding agent, weighing the components according to the weight, mixing for 0.5 hour, forming by selecting a press machine according to the single weight of a sliding plate, drying a green body for 24 hours at the temperature of 110 DEG C, loading into a kiln, firing at 1500 DEG C for 8 hours, hooping the fired green body, adhering a steel shell, grinding, coating, finishing, checking and accepting, and storing in a warehouse. According to the thermal-shock-resistant magnesium sliding plate produced by the invention, low-expansion spinel is generated around magnesia particles to absorb thermal expansion of the magnesia particles, so that the internal thermal stress of the material is reduced and the thermal shock resistance is improved, through modification, the surface activity of magnesia particles is improved, sintering is promoted, combination of the particles and a matrix is strengthened, and the high-temperature strength is improved, so that the service life of the magnesian skateboard is prolonged and the sintering temperature is reduced.

Description

technical field [0001] The invention relates to a sliding brick for steelmaking and continuous casting, in particular to a sliding brick with surface-modified magnesia particles and a production method thereof, belonging to the production field of magnesia series sliding bricks. Background technique [0002] Sliding bricks are used in steelmaking and continuous casting to regulate and control the flow of molten steel, or used in the slag blocking tapping system of converters to improve the slag blocking effect. With the development of special steel, calcium treatment of molten steel has become inevitable. The traditional aluminum-zirconium-carbon sliding plate has serious melting loss when pouring calcium-treated steel. Magnesium sliding plate has better corrosion resistance to calcium-treated steel and is low in cost. However, the thermal expansion coefficient of magnesia particles is relatively large, and large thermal stress is generated in the material at high temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043C04B35/622C04B35/628C04B35/64B22D41/32
CPCC04B35/043C04B35/622C04B35/62813C04B35/64B22D41/32C04B2235/5427C04B2235/5436C04B2235/3222C04B2235/656C04B2235/6567C04B2235/9607
Inventor 韩晓源石凯马世行夏熠张逸栗正新
Owner HENAN UNIVERSITY OF TECHNOLOGY
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