Composition and preparation method of magnesium-yttrium-calcium compound stabilized zirconia nozzle brick

A technology for stabilizing zirconia and nozzle bricks, applied in the field of refractory materials, can solve the problems of low service life of nozzles, low density of zirconia nozzles, and high production costs, and achieve high production efficiency, good thermal shock stability and low production costs. Effect

Inactive Publication Date: 2014-07-23
上海宝威陶瓷新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN201210061568.5 patent discloses that the zirconia sizing nozzle preparation method contains more than 2% alumina components, adopts ball milling for 24h-48h, and adopts isostatic pressing molding process, the density of zirconia nozzle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: 91.7% by weight of fused monoclinic zirconia micropowder, 5% fused calcium yttrium composite stabilized zirconia micropowder, 2.4% high-purity active magnesia and 0.9% high-purity yttrium oxide micropowder were first added with water and stirred, Achieving agglomeration, then using a granulator to granulate, and then according to the shape requirements of the nozzle brick, put the granulated mud on a hydraulic press to form it, and transfer the formed saliva to a dryer for 12 hours , and then placed in a high-temperature kiln for sintering at 1700 ° C for 6 hours, the volume of the nozzle brick is 5.34 g / cm 3 , the apparent porosity is 4.5%, and the thermal shock resistance is average.

Embodiment 2

[0021] Example 2: 90% by weight of fused monoclinic zirconia micropowder, 7% fused calcium yttrium composite stabilized zirconia micropowder, 2.2% high-purity active magnesia and 0.8% high-purity yttrium oxide micropowder were first added with water and stirred , to achieve agglomeration, and then use a granulator to granulate, and then according to the shape requirements of the nozzle brick, put the granulated mud on a hydraulic press to form it, and transfer the formed saliva to a dryer for drying for 12 hours, and then placed in a high-temperature kiln for sintering at 1650 ° C for 8 hours, the volume of the nozzle brick is 5.32 g / cm 3 , the apparent porosity is 6.4%, and the thermal shock resistance is good.

Embodiment 3

[0022] Example 3: 86.5% by weight of fused monoclinic zirconia micropowder, 13% fused calcium yttrium composite stabilized zirconia micropowder, 2% high-purity active magnesia and 0.5% high-purity yttrium oxide micropowder were first added with water and stirred , to achieve agglomeration, and then use a granulator to granulate, and then according to the shape requirements of the nozzle brick, put the granulated mud on a hydraulic press to form it, and transfer the formed saliva to a dryer for drying for 12 hours, and then placed in a high-temperature kiln for sintering at 1650°C for 8 hours, the volume of the nozzle brick is 5.29g / cm 3 , the apparent porosity is 7.5%, and the thermal shock resistance is very good.

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PUM

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Abstract

The invention discloses a composition and a preparation method of a magnesium-yttrium-calcium compound stabilized zirconia nozzle brick and belongs to the technical field of refractory materials. Firstly, an electro-fused zirconia monoclinic micro powder, an electro-fused calcium-yttrium compound stabilized zirconia micro powder, high-purity active magnesium oxide and a high-purity yttrium oxide micro powder are stirred in the presence of a polyvinyl alcohol binding agent until an agglomerate can be formed; secondly, the mixture is pelletized by using a pelletizer; thirdly, according to the shape requirement of the nozzle brick, the pelletized pug is compression-molded on a hydraulic press, and the molded nozzle bricks are put in a dryer at a temperature ranging from 120 to 150 DEG C and dried for 12-24 hours, and then the nozzle bricks are put in a kiln to be sintered at a temperature ranging from 1600 to 1700 DEG C for 6-10 hours so that the volume density of the nozzle is 5.2g/cm<3> and the apparent porosity is less than 10%. The manufacturing method is simple, the formed nozzle bricks have the characteristics of liquid steel erosion resistance, scouring resistance and good thermal shock resistance, and also the characteristics of high production efficiency and low production cost.

Description

technical field [0001] The invention relates to a composition and a preparation method of a magnesium yttrium calcium composite stabilized zirconia nozzle brick, belonging to the technical field of refractory materials. Background technique [0002] With the development of steelmaking technology, the conditions for the use of refractory materials for the sizing nozzle of the tundish and the upper nozzle of the tundish have become increasingly harsh. In order to increase the life of the nozzle brick, even when the refractory material is in contact with molten steel, it is necessary to prevent it from reacting with molten steel and slag. The damage of nozzle bricks is not only due to the chemical action of molten steel and steel slag, but also due to physical actions such as cracks and spalling caused by rapid thermal shock of molten steel and wear of molten steel. Therefore, in order to enable the nozzle brick to operate stably, refractory materials that can resist thermal s...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/48C04B35/622
Inventor 方文兵李杨
Owner 上海宝威陶瓷新材料有限公司
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