Preparation method of high-temperature electric furnace heat-insulation porous ceramic lining

A technology of thermal insulation and porous ceramics, applied in the field of ceramic materials, can solve the problems of low porosity, hindrance to application, poor stability, etc., and achieve the effects of high porosity, precise and adjustable pore structure, and low cost

Inactive Publication Date: 2020-04-17
安徽锵信网络科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional kilns and high-temperature electric furnaces are mostly lined with porous ceramics, but the existing single-phase porous ceramics have low porosity and poor stability at high temperatures, which has hindered their further application.

Method used

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  • Preparation method of high-temperature electric furnace heat-insulation porous ceramic lining

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for preparing a heat-insulating and heat-preserving porous ceramic inner lining of a high-temperature electric furnace, specifically as follows:

[0029] Add dilute hydrochloric acid dropwise to the ethanol aqueous solution with a mass concentration of 28% to adjust the pH to 2-3, add tetraethyl orthosilicate dropwise under mechanical stirring at 400r / min, continue stirring for 35min after the dropping, and adjust the speed to 150r / min Add ammonia water dropwise in 1 minute until the pH of the system reaches 9-10. After reacting for 6 hours, the silica gel is obtained, which is allowed to stand at room temperature for 28 hours. Alkanes were replaced 3 times, each time for 13 hours, taken out and dried at 80°C for 12 hours, ground into powder and mixed with carbon black and trace nano-silicon carbide evenly, the weight ratio of dried silica gel to carbon black was 1:1.3, nitrogen Under protection, react at 1400°C for 3 hours to obtain a porous nano-silicon carbi...

Embodiment 2

[0031] A method for preparing a heat-insulating and heat-preserving porous ceramic inner lining of a high-temperature electric furnace, specifically as follows:

[0032] Add dilute hydrochloric acid dropwise to the ethanol aqueous solution with a mass concentration of 24% to adjust the pH to 2-3, add tetraethyl orthosilicate dropwise under mechanical stirring at 300r / min, continue stirring for 32min after dropping, adjust the speed to 180r / min Add ammonia water dropwise in 1 minute until the pH of the system reaches 9-10. After reacting for 5 hours, the silica gel is obtained, which is allowed to stand at room temperature for 30 hours. Alkanes were replaced 3 times, 12 hours each time, taken out and dried at 85°C for 15 hours, ground into powder and mixed evenly with carbon black and a small amount of nano-silicon carbide. The weight ratio of the dried silica gel to carbon black was 1:1.4, nitrogen Under protection, react at 1400°C for 4 hours to obtain a porous nano-silicon car...

Embodiment 3

[0034] A method for preparing a heat-insulating and heat-preserving porous ceramic inner lining of a high-temperature electric furnace, specifically as follows:

[0035] Add dilute hydrochloric acid dropwise to the ethanol aqueous solution with a mass concentration of 30% to adjust the pH to 2-3, add tetraethyl orthosilicate dropwise under 450r / min mechanical stirring, continue stirring for 40min after dropping, adjust the speed to 120r / min Add ammonia water dropwise in 1 minute until the pH of the system reaches 9-10. After 10 hours of reaction, the silica gel is obtained. Let it stand at room temperature for 28 hours. After immersing the silica gel in absolute ethanol at 40°C and aging it for 5 days, use n-hexane Alkanes were replaced 3 times, each time for 13 hours, taken out and dried at 95°C for 12 hours, ground into powder and mixed with carbon black and trace nano-silicon carbide evenly, the weight ratio of dried silica gel to carbon black was 1:1.5, nitrogen Under prot...

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Abstract

The invention provides a preparation method of a high-temperature electric furnace heat-insulation porous ceramic lining, and belongs to the field of ceramic materials. The preparation method specifically comprises the following steps: preparing porous nanosilicon carbide components, carrying out dry grinding on rho-aluminum oxide, diatomite, a porous nano silicon carbide component and yttrium oxide for 45-50 h, adding an obtained mixture into deionized water, then adding aluminum fluoride, molybdenum trioxide and a polyacrylamide dispersing agent; carrying out wet grinding for 15 to 20h to obtain a slurry with good flowing performance, transferring the slurry into a vacuum drying oven; discharging air in the slurry at negative pressure at 40-45 DEG C; injecting the slurry into a mold under the protection of nitrogen; placing the mold in liquid nitrogen to be frozen for 10-20 min until the internal slurry is completely frozen; transferring the mold into a vacuum freeze dryer; slowly cooling to -50 to -55 DEG C, carrying out freeze-drying for 20-24 hours at the vacuum degree of 50-100Pa, taking the mold out, demolding to obtain a blank, and sintering the crude blank in a vacuum carbon tube furnace. The porous ceramic lining disclosed by the invention is high in compressive strength, high in porosity, low in heat conductivity coefficient, low in density and low in reheating linear shrinkage rate.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a method for preparing a heat-insulating and heat-preserving porous ceramic inner lining of a high-temperature electric furnace. Background technique [0002] The electric furnace is a heating furnace that converts the electric energy in the furnace into heat to heat the workpiece. The electric furnace can be divided into resistance furnace, induction furnace, electric arc furnace, plasma furnace, electron beam furnace and so on. Compared with the fuel furnace, the advantages of the electric furnace are: the atmosphere in the furnace is easy to control; the material is heated quickly; the heating temperature is high; the temperature is easy to control; the production process is easier to realize mechanization and automation; It is more environmentally friendly and helps to alleviate the increasingly serious environmental problems. [0003] The porous ceramic material is a kind o...

Claims

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Application Information

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IPC IPC(8): C04B35/185C04B35/81C04B35/622C04B35/626C04B38/08C04B38/00F27D1/16
CPCC04B35/185C04B35/622C04B35/626C04B38/0605C04B38/08C04B38/085C04B2235/3225C04B2235/3256C04B2235/3826C04B2235/445C04B2235/5276C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607C04B2235/9615F27D1/16C04B35/803C04B38/0074
Inventor 马成龙
Owner 安徽锵信网络科技有限公司
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