Zirconium oxide refractory with homogeneous micro-crystallized structure and preparation method thereof

A technology of refractory material and zirconia, applied in the field of refractory material, can solve the problems of easy crushing of particles, low particle strength, and difficulty in stabilizing and guaranteeing material properties, so as to achieve the effect of improving the forming performance.

Inactive Publication Date: 2012-03-21
ZHEJIANG ZILI HIGH TEMPERATURE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by spray granulation, it is difficult to obtain spherical particles exceeding 150 μm, and the particle strength is low; by counter-roll granulation, the obtained particles are irregular prismatic, and the particles are easily crushed during the granulation process, resulting in low yield
In order to ensure the bulk density and sintering performance, in the pressed semi-finished products, the particles produced by the spray or double-roll method are easily broken, resulting in a part of the finished product with a dense structure, some with a large number of coarse pores, and a large number of pores in the middle of the particles. At the same time, ZrO 2 Large variance in grain size and uneven distribution
Therefore, it is difficult to stabilize and guarantee the performance of the material, and further breakthroughs and improvements are needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The zirconium ring for the ladle slide plate of this embodiment is prepared by the following steps:

[0023] A. First, take at room temperature: 32 kg of fused monoclinic zirconia powder with a particle size of -325 mesh; 35 kg of fused monoclinic zirconia powder with a particle size of -1000 mesh; 28 kg of fused monoclinic zirconia powder with d50≤3 μm; Lightly burned magnesia powder 2.5kg, yttrium oxide powder 1kg; calcium nitrate 1kg; yellow dextrin 0.5kg; plus 10kg binder. The binder raw materials are composed of: 0.45kg of industrial ethanol; 0.65kg of polyvinyl alcohol; 8.3kg of distilled water; and 0.6kg of industrial glycerin. The binder is prepared by the following method: first mix industrial ethanol and polyvinyl alcohol, then add boiling distilled water, stir for 15-30 minutes and heat to 60°C to fully dissolve the polyvinyl alcohol, then add industrial glycerin, and stir until no knots block, filter and cool.

[0024] B. Use GHL-200L high-speed mixing...

Embodiment 2

[0041] The sizing nozzle for continuous casting of this embodiment is prepared by the following steps:

[0042] A. First, take according to the weight ratio under normal temperature conditions: fused monoclinic zirconia powder with a particle size of -325 mesh 28kg; fused monoclinic zirconia powder with a particle size of -1000 mesh 38kg; fused monoclinic zirconia powder with a particle size of -1000 mesh; 27kg of fine powder; 3.5kg of light-burned magnesia fine powder with d50≤2μm, 0.5kg of yttrium oxide fine powder; 1kg of yttrium nitrate; 2kg of calcium nitrate; plus 8kg of binder. The binder raw materials are composed of: 0.4kg of industrial ethanol; 0.5kg of polyvinyl alcohol; 8.6kg of distilled water; and 0.5kg of industrial glycerin. The preparation method of the binding agent is the same as in Example 1.

[0043] B. Use GHL-200L high-speed mixing and granulating machine for mixing and granulating. The mixing and granulation process is as follows: first put all th...

Embodiment 3

[0059] The high-temperature kiln push plate and pillars of this embodiment are prepared by the following steps:

[0060] A. First, take according to the weight ratio at room temperature: 38kg of fused monoclinic zirconia powder with a particle size of -325 mesh; 35kg of fused monoclinic zirconia powder with a particle size of -1000 mesh; fused monoclinic zirconia powder with d50≤3μm Micropowder 20kg; d50≤2μm lightly burned magnesia micropowder 3kg, yttrium oxide micropowder 1kg; yttrium nitrate 1kg; calcium nitrate 1kg; yellow dextrin 1kg; plus 12kg binder. The binder raw materials are composed of: 0.6kg of industrial ethanol; 0.96kg of polyvinyl alcohol; 9.6kg of distilled water; and 0.84kg of industrial glycerin. The preparation method of the binding agent is the same as in Example 1.

[0061] B. Use GHL-200L high-speed mixing and granulating machine for mixing and granulating. The mixing and granulation process is: first put all the solid powder into it, turn on high-...

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Abstract

The invention discloses a zirconium oxide refractory with a homogeneous micro-crystallized structure. The raw materials of the zirconium oxide refractory comprise the following components by weight percent: 92-96wt% of fused monoclinic zirconium oxide, 4-8wt% of compound stabilizer and sintering aid and 0-1wt% of yellow dextrin. Simultaneously, the invention also discloses a preparation method ofthe zirconium oxide refractory. The preparation method comprises the following steps of: firstly, mixing the raw material dry powder for 1-2 minutes by adopting a high-speed mixing and pelleting machine; after additionally adding 8-12wt% of combining agent, carrying out high-speed pug milling for 5-8 minutes, and then cutting for 1-3 minutes at a high speed; after boiling drying and screening, pelleting, and pressing and forming at the pressure of 150-200MPa; drying a formed green body for 12-24 hours at the temperature of 110 DEG C; and calcining for 2-3 hours at the temperature of 1600-1650DEG C. The zirconium oxide refractory of the invention has the advantages of high temperature and high strength, low apparent porosity, small pore aperture, good scouring resistance and stripping resistance and strong thermal shock resistance. The zirconium oxide refractory of the invention not only can adapt to longevity requirements of a steel ladle, an intermediate ladle sliding plate and a continuous casting sizing water gap but also can be used as longevous kiln furniture.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. It specifically relates to a homogeneous microcrystalline structure zirconia refractory material and a preparation method thereof. Background technique [0002] Continuous casting functional refractory materials such as slide plates have the functions of molten steel injection and flow regulation, and can withstand chemical erosion and physical erosion of high-temperature molten steel as well as severe thermal shock, and the service conditions are very harsh. With the rapid development of iron and steel technology, the molten steel calcium treatment process has been widely used, and the use of aluminum-carbon or aluminum-zirconium-carbon slides has serious melting loss and significantly reduced durability. ZrO 2 The chemical properties are very stable at high temperature, and it does not react with CaO to form low-melting substances. It is an ideal material for skateboards and has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 吴斌
Owner ZHEJIANG ZILI HIGH TEMPERATURE TECH CO LTD
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