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Sintered fused alumina zirconia refractory raw material and preparation method thereof

A technology of refractory raw material, zirconium corundum, which is applied in the field of corundum refractory materials, can solve the problems of inability to give full play to the toughening effect of ZrO2, high cost of raw material preparation, uneven distribution, etc., and achieves excellent thermal shock resistance stability, low production cost, The effect of the process is simple and easy to operate

Inactive Publication Date: 2016-09-28
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current production of fused zirconia corundum refractory raw materials has the following main problems: 1) The preparation process consumes a lot of energy, and ZrO 2 The amount of addition is large, which makes the preparation cost of raw materials higher; 2) ZrO in raw materials 2 The grain size is relatively large (generally above 50 μm), and the distribution is uneven, so ZrO cannot be fully utilized 2 Toughening effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A sintered zirconium corundum refractory raw material and a preparation method thereof. According to the mass ratio of industrial alumina powder: ball forming liquid is 1: (0.16~0.18), the alumina powder is first placed in the ball forming machine, and the ball forming liquid is sprayed to obtain a ball with a diameter of 18 ~ 25mm. The green balls are sent into the drying chamber of the high-temperature shaft kiln, dried at 450-500°C for 70-80 minutes, and then sent into the firing chamber of the high-temperature shaft kiln at 1850-1870°C Keep warm for 25-30 minutes under the same conditions, cool down with the furnace, crush, sieve, and pack to get sintered zirconium corundum refractory raw material.

[0025] The preparation method of described spherical liquid is: take 86~88wt% zirconium oxychloride, 7~9wt% calcium chloride, 1~3wt% yttrium chloride and 2~3wt% cerium chloride as raw material, press The solid-to-liquid ratio is 40~60g / L. Add water to the raw material,...

Embodiment 2

[0028] A sintered zirconium corundum refractory raw material and a preparation method thereof. According to the mass ratio of α-alumina powder: ball forming liquid is 1: (0.17~0.19), the alumina powder is first placed in the ball forming machine, and the ball forming liquid is sprayed to obtain a ball with a diameter of 19~ 26mm green balls; then send the green balls into the drying chamber of the high-temperature shaft kiln, dry at 500-550°C for 80-90 minutes, then send them into the firing chamber of the high-temperature shaft kiln, and dry them at 1870-1890°C Keep warm for 30-35 minutes at ℃, cool with the furnace, crush, sieve, and package to obtain sintered zirconium corundum refractory raw material.

[0029] The preparation method of described spherical liquid is: take 88~90wt% zirconium oxychloride, 5~7wt% calcium nitrate, 3~5wt% yttrium chloride and 1~2wt% cerium chloride as raw material, according to solid The liquid ratio is 60~80g / L. Add water to the raw material, ...

Embodiment 3

[0032] A sintered zirconium corundum refractory raw material and a preparation method thereof. According to the mass ratio of α-alumina powder: ball forming liquid is 1: (0.18~0.20), the alumina powder is first placed in the ball forming machine, and the ball forming liquid is sprayed to obtain a ball with a diameter of 20~ 27mm green balls; then send the green balls into the drying chamber of the high-temperature shaft kiln, dry at 550-600°C for 90-100 minutes, then send them into the firing chamber of the high-temperature shaft kiln, and dry them at 1880-1900°C Keep warm for 35-40 minutes at ℃, cool with the furnace, crush, sieve, and pack to get sintered zirconium corundum refractory raw material.

[0033] The preparation method of described spherical liquid is: take 90~92wt% zirconium oxychloride, 4~6wt% magnesium chloride, 4.5~6.5wt% yttrium chloride and 0.5~1.5wt% cerium chloride as raw materials, press The solid-to-liquid ratio is 80~100g / L. Add water to the raw materi...

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Abstract

The invention relates to a sintered fused alumina zirconia refractory raw material and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: placing alumina powder into a ball forming mill, and spraying ball forming liquid to obtain blank balls being 18-28mm in diameters, wherein the mass ratio of the alumina powder to the ball forming liquid is 1:(0.16-0.22); introducing the blank balls into a drying chamber of a high-temperature shaft kiln, drying at the temperature of 450-650 DEG C for 70-100 minutes, introducing the dried blank balls into a burning chamber of the high-temperature shaft kiln, preserving heat at the temperature of 1,850-1,900 DEG C for 25-45 minutes, cooling along with the kiln, smashing, sieving and packaging to obtain the sintered fused alumina zirconia refractory raw material. A preparation method of the ball-forming liquid comprises the following steps: preparing 86-92 percent by weight of zirconium oxychloride, 4-9 percent by weight of calcium salt or magnesium salt, 1-6.5 percent by weight of yttrium chloride and 0.5-3 percent by weight of cerium chloride to serve as raw materials; adding water into the raw materials in a solid-liquid ratio of 40-120g / L; stirring till clarification. The sintered fused alumina zirconia refractory raw material is low in cost, is suitable for industrial production, is uniform in structure and has superior thermal shock stability.

Description

technical field [0001] The invention belongs to the technical field of corundum refractory materials. Specifically relates to a sintered zirconium corundum refractory raw material and a preparation method thereof. Background technique [0002] Corundum refractory materials are widely used in steel, casting, ceramics and other industries due to their excellent high-temperature properties, and their application in the steel industry almost covers the entire process of iron-making and steel-making. However, in some parts with harsh working environments, it is still urgent to further improve the thermal shock resistance of corundum refractory materials. [0003] In recent years, scholars from various countries have proposed ZrO 2 Different toughening mechanisms mainly include: 1) phase transformation toughening mechanism; 2) micro-crack toughening mechanism; 3) dispersion toughening mechanism. According to the above ZrO 2 In the field of ceramics, zirconia toughened alumina ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/626
CPCC04B35/106C04B35/119C04B35/62615C04B35/62695C04B2235/3206C04B2235/3208C04B2235/3229C04B2235/3244C04B2235/74C04B2235/77C04B2235/785C04B2235/786
Inventor 徐义彪李亚伟赵义桑绍柏黄凯王庆虎李远兵李淑静
Owner WUHAN UNIV OF SCI & TECH
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