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A kind of silicon nitride composite phase bonded silicon carbide brick and its preparation method

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

Active Publication Date: 2016-03-02
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 silicon carbide sand, 10% industrial silicon, 5% silicon dioxide micropowder, 10% silicon nitride, 0.5% magnesium oxide, 2% zirconia, 2% binder and 0.5 % of lanthanum oxide; the preparation method of the binding agent is: get 30% lignin, 3.5% carboxymethyl cellulose, 10% yellow dextrin, 1.5% urea, 1% paper fiber by mass percentage and 54% tap water, heat the above paper fiber and tap water to 50°C while stirring, then continue to add lignin, carboxymethyl cellulose, yellow dextrin and continue to stir, slowly heat to 80°C and then stop heating, After cooling to room temperature, add urea and stir for 5-8 minutes, then let it stand for more than 24 hours. First put industrial silicon, silicon dioxide superfine powder, silicon nitride, magnesium oxide, zirconium oxide, and lanthanum oxide into the conical mixing equipment, mix for 30 minutes, and set aside; then put the silicon carbide sand and binder into the mixer, Stir for 5 minutes; add the previou...

Embodiment 2

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

Embodiment 3

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

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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 in particular relates to a silicon nitride complex-phase bonded silicon carbide brick and a preparation method thereof. Background technique [0002] With the rapid development of industrialization and the rapid growth of urban population in various countries, urban domestic garbage and industrial waste have increased sharply, causing serious pollution to the urban natural environment, and garbage incineration has become necessary. [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. It is extremely low, which not only increases the production cost, but also causes a certain period of repair stoppage, which has a se...

Claims

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Application Information

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Patent Type & Authority Patents(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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