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Preparation method of low-temperature sintering acid and alkali resistant porous silicon carbide ceramic film

A technology of porous silicon carbide and low-temperature sintering, which is applied in the field of inorganic membrane separation materials and inorganic porous materials, and can solve problems such as bending, poor alkali resistance, and mismatching thermal expansion coefficients.

Active Publication Date: 2018-02-06
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But because silicon oxide is resistant to acid and alkali, the silicon carbide filter tube produced by this method cannot be used under strong alkaline conditions, and when the filter tube is blocked, it cannot be washed with alkaline solution to restore the flux of the filter tube
In addition, due to the mismatch of thermal expansion coefficients of silicon carbide and silicon oxide, cracking or bending of the silicon carbide filter tube will occur during the sintering process
[0005] It can be seen from the above that the existing silicon carbide ceramic recrystallization sintering has the problems of high temperature, high equipment price, large energy consumption, and high cost; the existing liquid phase sintering of silicon carbide ceramics has poor thermal shock resistance, poor alkali resistance, and the fired product Disadvantages of easy cracking and easy bending of fired products

Method used

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  • Preparation method of low-temperature sintering acid and alkali resistant porous silicon carbide ceramic film
  • Preparation method of low-temperature sintering acid and alkali resistant porous silicon carbide ceramic film
  • Preparation method of low-temperature sintering acid and alkali resistant porous silicon carbide ceramic film

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Blend 45μm silicon carbide particles, sintering aids, carboxymethyl cellulose, graphite powder, and tung oil with water and ethanol (V / V=3:2) in a mass percentage ratio of 85:5:3.0:5.5:1.5 In the solvent, the mixed solvent accounts for 24wt% of the total amount. Dry mix in a strong mixer for 30 minutes, add solvent and wet mix for 120 minutes, and then vacuum mud once at -0.95MPa, pack the refined mud in a vacuum bag, and store it at room temperature 24 hours, before opening the tube, practice the mud again in vacuum. The extruded mud is a tubular porous silicon carbide ceramic membrane mud with an outer diameter of 32mm, a channel diameter of 4.2mm, 19 holes, and a length of 1016mm. The extrusion pressure is 10Mpa and the extrusion speed is 20mm / s. The mud billet was dried in the room for 24 hours, and the acid and alkali resistant porous silicon carbide ceramic support body was obtained by drying.

[0047] Mix 15 μm silicon carbide whiskers with sintering aid, carbox...

Embodiment 2

[0051] Blend 62 μm silicon carbide particles, sintering aids, carboxymethyl cellulose, graphite powder, and tung oil agent in water and ethanol (V / V=3:2) in a mass percentage ratio of 82:8:3.5:5.0:1.5 In the mixed solvent, the mixed solvent accounts for 21wt% of the total amount. Dry-mix in a strong mixer for 30 minutes, add solvent and wet-mix for 120 minutes, and then vacuum mud once at -0.95MPa, pack the trained mud in a vacuum bag, and store it in a vacuum bag at room temperature. Keep it dry for 24 hours, and vacuum the mud again before opening the tube. The extruded mud is a tubular porous silicon carbide ceramic membrane mud with an outer diameter of 32mm, a channel diameter of 4.2mm, 19 holes, and a length of 1016mm. The extrusion pressure is 8.5Mpa and the extrusion speed is 30mm / s. The mud is dried indoors for 24 hours, then transferred to an oven, and dried to obtain an acid and alkali resistant porous silicon carbide ceramic support.

[0052] Mix 45 μm silicon car...

Embodiment 3

[0055] Blend 122 μm silicon carbide particles, sintering aids, carboxymethyl cellulose, graphite powder, and tung oil with water and ethanol (V / V=3:1) in a mass percentage ratio of 80:10:5.0:3.0:2.0 In the solvent, the mixed solvent accounts for 19wt% of the total amount. Dry-mix in a strong mixer for 20 minutes, add solvent and wet-mix for 100 minutes, and then vacuum mud once at -0.95MPa, pack the refined mud in a vacuum bag, and store it at room temperature 24 hours, before opening the tube, practice the mud again in vacuum. The extrusion die is a tubular porous silicon carbide ceramic membrane blank with an outer diameter of 32mm, a channel of 3.2mm, and 37 holes, with an extrusion pressure of 8Mpa and an extrusion speed of 50mm / s. The mud is dried indoors for 24 hours, then transferred to an oven, and dried to obtain an acid and alkali resistant porous silicon carbide ceramic support.

[0056]Mix 60 μm silicon carbide whiskers with sintering aid, carboxymethyl cellulose ...

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Abstract

The invention relates to the technical field of porous ceramic materials and film separation, in particular to a low-temperature sintering acid and alkali resistant porous silicon carbide ceramic filmand a preparation method thereof. The method sequentially comprises the following steps of (1) support body manufacturing; (2) transition layer processing; (3) filtering layer processing; (4) film sintering process. The method provided by the invention has the characteristics that the sintering temperature is low; the production energy consumption is low; the process method is simple; the equipment requirements are low; the production cost and the investment cost are low; the control is flexible; the shaping is easy; the method is suitable for industrial customization and meets the scaled production. The porous silicon carbide ceramic film produced by the method has the characteristics of good hydrophilcity, great filtering flux, high porosity, high filtering precision, high mechanical intensity, good acid and alkali resistant performance and long service life.

Description

technical field [0001] The patent of the invention relates to the technical field of inorganic porous materials, in particular to the technical field of inorganic membrane separation materials, specifically a method for preparing low-temperature sintered acid and alkali-resistant porous silicon carbide ceramic membranes. Background technique [0002] Porous silicon carbide ceramics are widely used in environmental protection fields such as sewage treatment and high-temperature gas dust removal as filter materials. High, strong anti-pollution ability, simple operation, easy cleaning and many other advantages will become the key component materials and development trends of membrane separation technology in the field of environmental protection. The traditional sintering of silicon carbide ceramics usually adopts recrystallization sintering, solid phase sintering, reaction sintering and liquid phase sintering processes, among which the processes for sintering porous silicon ca...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/634C04B35/636C04B35/80C04B38/06
CPCC04B35/565C04B35/63444C04B35/6365C04B35/806C04B38/068C04B2235/5276C04B2235/5427C04B2235/5436C04B2235/96C04B2235/9692C04B38/0074C04B38/0054C04B38/067
Inventor 陈锋涛俞三传
Owner ZHEJIANG SCI-TECH UNIV
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