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Silicon nitride-silicon carbide composite brick and preparation method thereof

A technology of silicon carbide bricks and silicon nitride complexes, applied in the field of refractory ceramics, can solve the problems of low service life, impact on production efficiency, repairing shutdown and other problems, achieve strong acid and alkali resistance, scientific and simple preparation method, and improve oxygen content rate Effect

Active Publication Date: 2014-06-04
宜兴市钰玺窑业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional waste incinerator is composed of several materials, and the lining of the entire furnace body is made of different refractory materials. Even so, because the material of the incinerator lining is in a high temperature state for a long time, the key parts often need to be replaced in a short period of time. Very low, not only increases the production cost, but also causes a certain period of repair stoppage, which has a serious impact on production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 70% by weight of silicon carbide sand, 10% of industrial silicon, 5% of silica powder, 10% of silicon nitride, 0.5% of magnesium oxide, 2% of zirconia, 2% of binder and 0.5 % Lanthanum oxide; the preparation method of the binder is: 30% lignin, 3.5% carboxymethyl cellulose, 10% yellow dextrin, 1.5% urea, 1% paper fiber according to mass percentage With 54% tap water, heat the paper fiber and tap water to 50°C while mixing and stirring, then continue to add lignin, carboxymethyl cellulose, yellow dextrin and continue to stir, slowly heating to 80°C and then stop heating. After cooling to room temperature, add urea and stir for 5-8 minutes, and then stand for more than 24 hours. First put industrial silicon, ultrafine silicon dioxide powder, silicon nitride, magnesium oxide, zirconium oxide, and lanthanum oxide into the cone mixing equipment, mix for 30 minutes, and set aside; then put the silicon carbide sand and the binder into the mixer, Stir for 5 minutes; add th...

Embodiment 2

[0026] Take the weight percentage of 43% silicon carbide sand, 19% industrial silicon, 10% silicon dioxide powder, 20% silicon nitride, 2% magnesium oxide, 3% zirconia, 2% binder and 1 % Lanthanum oxide; the preparation method of the binder is: 10% lignin, 0.5% carboxymethyl cellulose, 20% yellow dextrin, 1% urea, 1.5% paper fiber according to mass percentage With 67% tap water, heat the paper fiber and tap water to 50°C while mixing and stirring, then continue to add lignin, carboxymethyl cellulose, yellow dextrin and continue to stir, slowly heating to 80°C and then stop heating. After cooling to room temperature, add urea and stir for 5-8 minutes, and then stand for more than 24 hours. First put industrial silicon, ultrafine silicon dioxide powder, silicon nitride, magnesium oxide, zirconium oxide, and lanthanum oxide into the cone mixing equipment, mix for 30 minutes, and set aside; then put the silicon carbide sand and the binder into the mixer, Stir for 5 minutes; add th...

Embodiment 3

[0028] Take 50% by weight of silicon carbide sand, 15% of industrial silicon, 10% of silica powder, 15% of silicon nitride, 3% of magnesium oxide, 4% of zirconia, 2.5% of binder and 0.5 % Lanthanum oxide; the preparation method of the binder is: 20% lignin, 2% carboxymethyl cellulose, 15% yellow dextrin, 1.5% urea, 1.5% paper fiber according to mass percentage With 60% tap water, heat the paper fiber and tap water to 50°C while mixing and stirring, then continue to add lignin, carboxymethyl cellulose, yellow dextrin and continue to stir, slowly heating to 80°C and then stop heating. After cooling to room temperature, add urea and stir for 5-8 minutes, and then stand for more than 24 hours. First put industrial silicon, ultrafine silicon dioxide powder, silicon nitride, magnesium oxide, zirconium oxide, and lanthanum oxide into the cone mixing equipment, mix for 30 minutes, and set aside; then put the silicon carbide sand and the binder into the mixer, Stir for 5 minutes; add t...

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Abstract

The invention discloses a silicon nitride-silicon carbide composite brick, comprising, by weight, 43 to 80% of silicon carbide sand, 5 to 19% of industrial silicon, 3 to 15% of micro silica powder, 10 to 20% of silicon nitride, 0.5 to 3.5% of a transforming agent, 0.5 to 4% of a toughening agent, 0.5 to 3% of a binder and 0.1 to 1% of an additive. Meanwhile, the invention further discloses a preparation method for a ceramic refractory material, i.e., the silicon nitride-silicon carbide composite brick. The ceramic refractory material provided by the invention has the advantages of novelty, creativity, advancement, practicality, wear resistance, anti-stripping performance, strong acid and alkaline resistance and substantial effects on matching of a monolithic lining and prolongation of an integral furnace age. The preparation method provided by the invention is simple, uses nitrogen and other nitrides in the air as sintering protection gas in the process of preparation, discharges oxygen in the air, thereby increasing a local oxygen-containing rate, and is beneficial and harmless to the natural environment and suitable for energetic popularization.

Description

Technical field [0001] The invention belongs to the field of refractory ceramics, and specifically relates to a silicon nitride composite bonded silicon carbide brick and a preparation method thereof. Background technique [0002] With the rapid development of industrialization in various countries and the rapid growth of urban populations, urban domestic waste and industrial waste have increased sharply, causing serious pollution to the urban natural environment, and garbage incineration has become necessary. [0003] Traditional waste incinerators are composed of several materials, and the lining of the entire furnace body is made of different refractory materials. Even so, because the material of the incinerator lining is in a high temperature state for a long time, the key parts often need to be replaced in a relatively short time. Very low, not only increases the production cost, but also causes a certain period of repair shutdown, which has a serious impact on production effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/565C04B35/622
Inventor 蒋玉清喻映君
Owner 宜兴市钰玺窑业有限公司
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