Novel semi-graphitization silicon nitride carbide brick and its production method

A technology of silicon carbonitride bricks and semi-graphitization, applied in the field of refractory materials and their production, can solve the problems of low strength, thermal shock spalling, poor cooling effect, etc., and achieve the effect of improving economic efficiency and prolonging life.

Inactive Publication Date: 2008-06-25
郑州华宇高炉工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to their low thermal conductivity (≤15w/m.k), the cooling effect is poor, the thermal stress is large, and thermal shock spalling is prone to occur. The combined water vapor-alkali corrosion also leads to the oxidative decomposition of these refractory materials.
There are also cases where semi-

Method used

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  • Novel semi-graphitization silicon nitride carbide brick and its production method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1: Weigh 20% electric calcined anthracite with a particle size of 0.074-10mm, 40% graphite with a particle size of 0.074-3mm, 30% industrial silicon with a particle size of no more than 320 mesh, and carbonized with a particle size of 0.074-2.5mm. 10% of silicon, put into the mixer, plus 20% of the total weight of the above raw materials, thermosetting phenolic resin,

[0027] After the raw materials are uniformly mixed, they are pressed and molded, dried and then charged into the kiln. The firing kiln is filled with nitrogen at a pressure of 0.15MPa and kept at a temperature of 1200°C for 24 hours. The product is cooled out of the kiln along with the furnace.

[0028] After the products are out of the kiln, their physical and chemical properties, surface quality and overall dimensions are inspected; the products that pass the inspection are processed according to the size standards or contract requirements; finally the products are packaged and stored, stored or sh...

Example Embodiment

[0029] The second embodiment: It is basically the same as the first embodiment, and the similarities will not be described again. The differences are:

[0030] Weigh the raw materials according to the formula: 50% electric calcined anthracite with a particle size of 0.074-10mm, 20% graphite with a particle size of 0.074-3mm, 15% industrial silicon with a particle size of no more than 320 mesh, and 15% silicon carbide with a particle size of 0.074-2.5mm. Put into the blender, plus thermosetting phenolic resin which accounts for 20% of the total weight of the above raw materials,

[0031] After mixing uniformly, it is pressed and molded, dried, and then put into the kiln. The kiln is filled with nitrogen at a pressure of 0.2MPa, and the furnace is kept at 1800°C for 8 hours for sintering. The product is cooled out of the kiln along with the furnace.

Example Embodiment

[0032] The third embodiment: It is basically the same as the first embodiment, and the similarities will not be described again. The differences are:

[0033] Weigh the raw materials according to the formula: 30% electric calcined anthracite with a particle size of 0.074-10mm, 30% graphite with a particle size of 0.074-3mm, 30% industrial silicon with a particle size of no more than 320 mesh, and 10% silicon carbide with a particle size of 0.074-2.5mm. Put into the mixer, add 17% of the total weight of the above-mentioned raw materials resin, after mixing uniformly, press and shape, dry and put into the kiln, fill the firing kiln with nitrogen at a pressure of 1.0MPa, at 1300℃ It is fired at the temperature for 10 hours, and the product is cooled out of the kiln with the furnace.

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Abstract

The invention relates the fire resistive material and the preparing method, especially the new pattern graphitization silicon carbide nitride brick and its preparing method. The material comprises 20-50wt% anthracite coal, 20-40wt% graphite, 15-30wt% industrial silicon, 10-30wt% silicon carbide, and 7-20wt% binding agent. The method comprises the following steps: mixing the raw material and binding agent, press forming, drying, and baking them at 1200-1800Deg.C for 8-24 hours at the atmosphere of nitrogen, and charging 0.1MPa nitrogen into calcining kiln. The invention has the advantages of good opposing iron and alkali metal corrosion capability, good heat conductivity, high thermal conductivity factor which above 30 w/m.k, and good earthquake resistance and high machinery strength. The invention can be used in furnace bottom, furnace hearth and inside lining from breast to shaft, extending the durability, and improving economic benefit.

Description

1. Technical field: [0001] The invention relates to a refractory material and a production method thereof, in particular to a semi-graphitized silicon carbonitride brick and a production method thereof. 2. Background technology: [0002] In order to obtain the longest possible blast furnace life under high-efficiency production conditions in the modern blast furnace ironmaking industry, thereby obtaining considerable economic benefits, microporous carbon bricks are generally used in the hearth containing molten iron and the working layer of the furnace bottom lining. Silicon nitride bonded silicon carbide bricks, sialon bonded corundum bricks or semi-graphite and graphite products are built from the bosh to the lower part of the furnace body. At present, the microporous carbon bricks used in the furnace bottom and the working layer of the hearth have technical characteristics such as good microporosity and a thermal conductivity of 14-20w / m.k. During use, it can better preve...

Claims

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Application Information

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IPC IPC(8): C04B35/52C04B35/632C04B35/622
Inventor 白继周聂桂秋白建伟王培茹
Owner 郑州华宇高炉工程技术有限公司
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