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Self-adaptive zirconium oxide tundish nozzle

A zirconia and tundish technology, applied in the field of refractory materials, can solve problems such as short service life, and achieve the effects of reducing energy consumption, uniform material and high product strength

Inactive Publication Date: 2016-03-23
ZHEJIANG IRON LION HIGH TEMPERATURE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a functional refractory material, most of the sizing nozzles have a relatively short service life due to corrosion resistance and shrinkage problems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Adaptive zirconia tundish nozzle, prepared by the following method:

[0019] (1) equipped with raw materials:

[0020] According to parts by weight, 40 parts of 50% stabilization rate partial magnesium oxide stabilized zirconia, 10 parts of particle size is 52nm superfine aluminum-rich desilication monoclinic zirconia powder, 20 parts of monoclinic zirconia with 2UM particle size, 3 parts One part of ultrafine activated magnesia with a particle size of 10 μm, and one part with a particle size of 20 μm yttrium oxide fine powder.

[0021] Wherein, the semi-stable zirconia is matched according to the quantity ratio, D10:D20:D30:D50:D90 according to 1:1:2:3:1.5;

[0022] (2) Granulation:

[0023] According to the formula, the raw materials are granulated, first pressed with a four-column press, and then the pressed product is vacuumized, put into an isostatic press, and kept under pressure for 5 minutes under a pressure of 120 MPa for further molding. The uniformity of th...

Embodiment 2

[0025] Adaptive zirconia tundish nozzle, prepared by the following method:

[0026] (1) equipped with raw materials:

[0027] According to parts by weight, 60 parts of 30% stabilization rate partial magnesia stabilized zirconia, 20 parts of particle size is 35nm superfine aluminum-rich desilication monoclinic zirconia powder, 30 parts of monoclinic zirconia with 2UM particle size, 2 A particle size of 10 μm ultrafine activated magnesia, 2 parts particle size of 16 μm yttrium oxide fine powder.

[0028] Wherein, the semi-stable zirconia is matched according to the quantity ratio, D10:D20:D30:D50:D90 according to 1:1:2:3:1.5;

[0029] (2) Granulation:

[0030] According to the formula, the raw materials are granulated, first pressed with a four-column press, and then the pressed product is vacuumized, put into an isostatic press, and kept under pressure for 5 minutes under a pressure of 120 MPa for further molding. The uniformity of the product The performance is the same, pu...

Embodiment 3

[0032] Adaptive zirconia tundish nozzle, prepared by the following method:

[0033] (1) equipped with raw materials:

[0034] According to parts by weight, 50 parts of 40% stabilization rate partial magnesia stabilized zirconia, 13 parts of particle size is 45nm superfine aluminum-rich desilication monoclinic zirconia powder, 28 parts of monoclinic zirconia with 2UM particle size, 3 parts One part of ultrafine activated magnesia with a particle size of 10 μm, and one part with a particle size of 19 μm yttrium oxide fine powder.

[0035] Wherein, the semi-stable zirconia is matched according to the quantity ratio, D10:D20:D30:D50:D90 according to 1:1:2:3:1.5;

[0036] (2) Granulation:

[0037] According to the formula, the raw materials are granulated, first pressed with a four-column press, and then the pressed product is vacuumized, put into an isostatic press, and kept under pressure for 5 minutes under a pressure of 120 MPa for further molding. The uniformity of the produ...

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Abstract

The invention discloses a self-adaptive zirconium oxide tundish nozzle. Serving as functional fireproof materials, most of sizing nozzles have relatively short service life because of the problems of erosion resistance and hole shrinkage. According to the invention, in the research direction, by researching the crystalline phase, particle size distribution and firing process of zirconium oxide, on the premise that the thermal shock stability and erosion resistance of products are ensured, in the process of eroding a zirconium core in molten steel, a second sintering shrinkage phenomenon is caused, thereby achieving the dynamic change of pore sizes; and tracking is carried out aiming at the special service environment of a steel mill, thereby controlling the initial air hole and body density so as to achieve the dynamic balance of nozzle pore sizes. In the aspect of hole shrinkage, Al2O3 nodulation is mainly prevented. Therefore, in the invention, argon blowing-free materials are used for preventing blockage, partial aluminum-rich desiliconized monoclinic zirconium oxide is added, surface sintering of the products is promoted, and smooth surfaces are not favorable for attachment of aluminum oxide.

Description

technical field [0001] The invention relates to an adaptive zirconia tundish nozzle and a production process thereof, belonging to the field of refractory materials. Background technique [0002] The tundish nozzle is the passage for the molten steel from the tundish to the mold, which ensures that the molten steel flows smoothly from the tundish to the mold without any impurities falling off into the molten steel. As the service life of the tundish is getting longer and the purity of molten steel is getting higher and higher, most of the zirconium nozzles in China are either severely expanded in diameter, which affects the life; or shrink in diameter, which affects the billet casting speed; the final impact The service life of the tundish and the output of billets. The new self-adaptive zirconium nozzle, through the study of zirconia grains and firing process, under the premise of ensuring the thermal shock stability and corrosion resistance of the product, has achieved se...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/48C04B35/622
Inventor 应文瀚都智刚周涛佘峰强许琳媛
Owner ZHEJIANG IRON LION HIGH TEMPERATURE MATERIALS CO LTD
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