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SiSiC cushion block for walking beam furnace and preparation method thereof

A technology of walking heating furnace and block, which is applied in the field of composite high-temperature ceramics, can solve problems such as billet deviation, and achieve the effects of low cost, high strength, and small thermal conductivity

Inactive Publication Date: 2013-01-30
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

Therefore, the SiSiC pad can not only effectively solve the problem of "water cooling scar" at the contact part between the heated billet and the pad and the problem of billet deviation caused by high temperature "compression" deformation of the pad, but also has better durability and more easy to produce

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 90kg of SiC powder, 10kg of carbon powder, 1kg of carboxymethyl cellulose and 0.5kg of ammonium polyacrylate, add 20kg of water, mix and grind in a ceramic ball mill for 6 hours to make a slurry, inject it into a plaster mold and cast it into a wet pad, static Place and maintain for 25 hours, and demould to obtain a wet billet.

[0022] Put the wet billet into a drying furnace and hold it at 110°C for 32 hours, and then keep it in a sintering furnace with metal Si at 1700°C and a vacuum of 30Pa for 32 hours to obtain a base plate blank.

[0023] Machining the blank to produce a SiSiC pad.

Embodiment 2

[0025] Weigh 99kg of SiC powder, 1kg of carbon powder, 333g of carboxymethyl cellulose and 167g of sodium polyacrylate, add 16kg of water, mix and grind in a ceramic ball mill for 10 hours to make slurry, inject it into a gypsum mold and cast it into a wet pad, and let it stand Curing for 20 hours, demoulding to get wet billet.

[0026] Put the wet billet into a drying furnace and hold it at 120°C for 24 hours, and then keep it in a sintering furnace with metal Si at 1850°C and a vacuum of 100Pa for 4 hours to obtain a base plate blank.

[0027] Machining the blank to produce a SiSiC pad.

Embodiment 3

[0029] Weigh 94kg of SiC powder, 4kg of charcoal powder, 600g of carboxymethyl cellulose and 300g of sodium polyacrylate, add 18kg of water, mix and grind it in a ceramic ball mill for 12 hours to make slurry, inject it into a plaster mold and cast it to form a wet pad, and let it stand Curing for 30 hours, demoulding to obtain a wet billet.

[0030] Put the wet billet into a drying furnace and hold it at 100°C for 48 hours, and then place it in a sintering furnace with metal Si at 1800°C and a vacuum of 80 Pa for 10 hours to obtain a base plate blank.

[0031] Machining the blank to produce a SiSiC pad.

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Abstract

The invention relates to a preparation method of a SiSiC cushion block for a walking beam furnace. The preparation method comprises the following steps of: grinding 90-99 parts of SiC powder, 1-10 parts of carbon powder, 0.5-1.5 parts of an additive and 16-20 parts of water into slurry; molding by casting; drying a wet blank; sintering through a siliconizing reaction; machining and the like. The preparation method disclosed by the invention has the advantages of simple process, low cost, and capability of realizing direct baking without sintering through a nitriding reaction. The prepared SiSiC cushion block has the advantages of high temperature resistance, very high strength, high creeping resistance, low heat conductivity coefficient, high thermal shock resistance and capability of replacing a heat-resistant alloy steel cushion block.

Description

【Technical field】 [0001] The invention belongs to the technical field of composite high-temperature ceramics, and in particular relates to a SiSiC cushion block for a hot-rolled walking heating furnace and a preparation method thereof. 【Background technique】 [0002] At present, the pads on the water-cooled beams in the walking heating furnace of the hot rolling plant of the metallurgical industry are made of heat-resistant alloy steel. Due to the high thermal conductivity and high-temperature creep of heat-resistant alloy steel, they are "compressed" and oxidized. Congenital defects can easily cause "deviation" of the heated billet, "water-cooled scar" (low temperature black mark) at the contact part with the block, and affect the quality of the rolled material, which has become a restriction for the production of high-tech steel products such as hot-rolled sheets. At the same time, the temperature of the "water-cooled scar" (low temperature black mark) is low, which reduce...

Claims

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Application Information

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