Graphite sleeves of rollers at furnace bottom and their dipping process and special apparatus thereof

A special equipment, graphite carbon technology, applied in the field of high temperature refractories, can solve the problems of reducing the commercial value of silicon steel sheets, nodules of silicon steel sheets, and high porosity

Inactive Publication Date: 2005-02-23
BASAN SPECIAL FIRE RETARDANT MATERIAL FACTORY SHANDONG
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the graphite carbon sleeves treated above still cannot be used at a temperature above 920°C, and cannot meet the needs of improving the grade of silicon steel sheets. This is because some of the above-mentioned inorganic compounds chemically react with the matrix graphite at such high temperatures Reactions such as chromic anhydride
In addition, the hearth roller ink carbon sleeve body produced by the invention of ZL94110738.8 has high porosity and uneven size and distribution of pores, which will easily cause nodules on the silicon steel sheet during use and reduce the commercial value of the silicon steel sheet.
Especially with the further increase of the linear speed of the silicon steel sheet in the furnace, the wear resistance of the graphite hearth roller produced by the above technology has been difficult to meet the new requirements

Method used

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  • Graphite sleeves of rollers at furnace bottom and their dipping process and special apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: the green body produced by the above-mentioned raw material formula is processed into a hearth roller graphite carbon sleeve, put into a dipping tank, vacuumize to -0.095Mpa, then inject the aluminum dihydrogen phosphate solution with a mass percentage concentration of 50%, add Press to 0.6Mpa, keep the pressure for 2 hours, take it out, air-dry and dry at 230°C, then heat-treat at 950°C, grind and groove, and then the finished bottom roller graphite carbon sleeve.

Embodiment 2

[0024] Embodiment 2: The green body is the same as in Embodiment 1, and the dipping, air-drying, drying and high-temperature treatment processes are also the same, and the dipping solution is changed to a magnesium dihydrogen phosphate solution with a mass percentage concentration of 50%.

Embodiment 3

[0025] Embodiment 3: The green body is the same as in Embodiment 1, and the dipping, air-drying, drying and high-temperature treatment processes are also the same, and the dipping solution is changed to a 50% mass percentage concentration of aluminum dihydrogen phosphate solution and a mass percentage concentration of 50% dihydrogen phosphate A mixture of magnesium solutions.

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PUM

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Abstract

A graphite carbon sleeve of the roller at furnace bearth is prepared from calcined coke powder, adhesive, and additional coke through proportional mixing, kneading, die pressing, calcining, high-pressure dipping in metallic phosphate solution, graphitizing machining for shaping, chemical treating and high-temp treating. Its dipping method and dedicated apparatus are also disclosed.

Description

[0001] The technical field mentioned: [0002] The invention belongs to special high-temperature refractory materials, and in particular relates to graphite carbon sleeves for hearth rolls used in heat treatment furnaces for silicon steel sheets, as well as their impregnation treatment methods and special equipment. Background technique: [0003] Bottom rollers for soaking furnaces for heat treatment of silicon steel sheets are divided in terms of production materials, including metal rollers, ceramic rollers and graphite rollers. The metal roller is made of heat-resistant steel, the biggest problem is that it is easy to deform and nodulate, which makes the silicon steel sheet difficult to level and easy to damage the silicon steel sheet, thus greatly reducing the quality of the silicon steel sheet. Therefore, the metal roller is used in the silicon steel sheet heat treatment furnace. The soaking zone has been eliminated. In addition to the above-mentioned nodulation phenomen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/622C21D1/00C21D9/56
Inventor 郝尚宝任庆祥孙启振李海涛林月珍李同庆纪国胜孙志文郭法军费传庆
Owner BASAN SPECIAL FIRE RETARDANT MATERIAL FACTORY SHANDONG
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