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Method for preparing zirconia cushion block used by walking-beam heating furnace

A walking heating furnace and zirconia technology, applied in the field of high-temperature-resistant inorganic materials, can solve the problems of reduced thermoplasticity and ductility of billets, large ablation of billets, and slow production speed, etc., and achieve good creep resistance and anti-corrosion Good thermal shock resistance and low thermal conductivity

Inactive Publication Date: 2012-11-07
湖北红花高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the low temperature in the "water-cooled scar" area also reduces the thermoplasticity and ductility of the steel billet, and the steel plate is prone to rolling cracks and scrapped, and the thinner the steel plate is rolled, the higher the scrap rate, especially when producing high-grade oriented silicon steel plate , ultra-thin sheets cannot even be rolled
[0003] In order to solve the problem of "water-cooling scar" in the contact part between the heated billet and the block, hot rolling mills usually adopt the method of increasing the heating temperature and prolonging the heating time to ensure that the billet achieves proper thermoplasticity and ductility. This method obviously consumes energy High, large billet ablation, slow production speed and low efficiency, and the heat-resistant steel block will be "compressed" damaged due to high temperature creep, causing the heated billet to "deviate" and affect the normal operation of the heating furnace Production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 100kg of zirconia fine powder, add 16kg of water, then add 0.2kg of sodium tripolyphosphate, 0.7kg of gum arabic powder and 0.1kg of quicklime powder, mix and grind in a ceramic ball mill for 10 hours to make a slurry, and then inject it into a plaster mold , after 24 hours of static curing, demould and take out the pad wet blank.

[0034] Dry the wet billet at 110°C for 24 hours under normal pressure to make a mat green body; place the green billet in a high-temperature furnace and heat it at 1750°C for 24 hours under normal pressure to sinter it into a mat sintered billet.

[0035] The sintered compact is subjected to conventional mechanical processing to obtain a zirconia pad for a walking heating furnace.

Embodiment 2

[0037] Weigh 100kg of zirconia fine powder, add 20kg of water, then add 2:7:1 sodium tripolyphosphate, gum arabic powder and quicklime for a total of 1.4kg, mix and grind for 10h to make a slurry, inject it into a plaster mold and let it stand for curing 24h to get the pad wet blank.

[0038] Dry the wet billet at 100°C for 48 hours under normal pressure to make a green block; place the green billet in a high-temperature furnace and heat it at 1790°C for 20 hours to make a sintered block.

[0039] The sintered compact is subjected to conventional mechanical processing to obtain a zirconia pad for a walking heating furnace.

Embodiment 3

[0041] Weigh 100kg of zirconia fine powder, add 22kg of water, then add 2:7:1 sodium tripolyphosphate, gum arabic powder and quicklime in total 1.5kg, mix and grind for 12h to make slurry, pour into plaster mold and let stand for 24h to obtain Pad block wet blank.

[0042] Dry the wet billet at 120°C for 24 hours under normal pressure to make a green block; place the green billet in a high-temperature furnace and heat it at 1850°C for 12 hours to make a sintered block.

[0043] The sintered compact is subjected to conventional mechanical processing to obtain a zirconia pad for a walking heating furnace.

[0044] It can be seen that the process of the present invention is simple and can be sintered without nitriding reaction. The zirconia pad prepared by the method has the advantages of high temperature resistance, high strength, good creep resistance, small thermal conductivity and good thermal shock resistance.

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Abstract

The invention belongs to the technical field of high temperature resistant inorganic materials and particularly relates to a method for preparing a zirconia cushion block used by a walking-beam heating furnace. The method includes: taking 100 parts of zirconia powder, 16-22 parts of water and 1.0-1.5 parts of additives, wherein the additives are mixtures composed of sodium tripolyphosphate, arabic gum powder and quick lime in weight ratio of 2:7:1; and obtaining the zirconia cushion block used by the walking-beam heating furnace after material mixing for blank making, sintering and heat preserving. The method is simple and convenient in process, sintering can be carried out directly without nitriding reaction, the obtained zirconia cushion block is high temperature resistance, large in strength, good in creep resistance, small in heat conduction coefficient and good in thermal shock resistance, and the problem of water-cooling scars generated on the contact portion of heated billets and the cushion block and the problem of billet offset caused by high temperature compression and deformation of the cushion block can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature-resistant inorganic materials, and in particular relates to a method for preparing a zirconia pad for a walking heating furnace, and a product obtained by the method. Background technique [0002] At present, most of the pads on the water-cooled beams in the walking heating furnace in the hot rolling plant of the metallurgical industry are made of heat-resistant alloy steel. Due to the congenital defects such as high thermal conductivity, high temperature creep and oxidation damage of heat-resistant alloy steel, it is easy to cause "deviation" when heating the billet, and "water-cooling scar" at the contact part with the block (so the uneven temperature or low temperature caused Partial black marks on the product), etc., which will affect the quality of rolled products. This problem has become one of the main bottlenecks restricting the rolling production of high-tech steel products such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 祝洪喜邓承继汪盛明张小东彭玮珂李君
Owner 湖北红花高温材料股份有限公司