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Acid and alkali corrosion-resistant silicon carbide porous support

A technology of porous support and silicon carbide, applied in the direction of chemical instruments and methods, applications, household appliances, etc., to achieve the effect of improving corrosion resistance, increasing porosity, and reducing low-temperature damage rate

Active Publication Date: 2015-07-08
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a silicon carbide porous support body with excellent acid and alkali corrosion resistance to solve the above-mentioned shortcomings of the existing ceramic membrane support body

Method used

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  • Acid and alkali corrosion-resistant silicon carbide porous support
  • Acid and alkali corrosion-resistant silicon carbide porous support
  • Acid and alkali corrosion-resistant silicon carbide porous support

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: the raw material composition of described silicon carbide porous support body is:

[0050]

[0051] The preparation steps of silicon carbide porous support are as follows: (1) first mix 0.5 μm silicon carbide powder with alumina and yttrium oxide evenly, then mix the aforementioned premix with 30 μm silicon carbide powder, methyl cellulose, polymethyl methacrylate Mix the ester evenly in proportion; (2) Mix water, silica sol, and tung oil in proportion; (3) Mix, knead and knead the premixed (1) and (2) in proportion to form plastic mud; ( 4) Extrude the mud material through a mold to form a green body; (5) Dry the green body and calcinate it in the air at 700 ° C to remove organic substances such as methyl cellulose and polymethyl methacrylate; (6) After the aforementioned calcined The support body is fired in an argon protection furnace, the temperature is raised to 1650°C at 30°C / min, and kept for 1h, then raised to 1900°C at 30°C / min, kept for 1h, an...

Embodiment 2

[0053] Embodiment 2: The silicon carbide porous support body raw material is composed of:

[0054]

[0055] The preparation steps of silicon carbide porous support are as follows: (1) first mix 1 μm silicon carbide powder with alumina and yttrium oxide evenly, then mix the aforementioned premix with 30 μm silicon carbide powder, methyl cellulose, polymethyl methacrylate Mix evenly in proportion, (2) mix water, silica sol, and tung oil in proportion; (3) mix the premixed (1) and (2) in proportion, knead, and knead into mud; (4) Extrude the slime through a mold to form a green body; (5) Dry the green body and calcinate it in the air at 700°C to remove organic substances such as methyl cellulose and polymethyl methacrylate; (6) The support body after the calcined Fire in an argon protection furnace, heat up to 1650°C at 30°C / min, hold for 1h, then raise the temperature to 1900°C at 30°C / min, hold for 1h, then raise the temperature to 2200°C at 30°C, hold for 1h, with the furna...

Embodiment 3

[0057] Embodiment 3: the silicon carbide porous support body raw material is composed of:

[0058]

[0059]

[0060] The preparation steps of silicon carbide porous support are as follows: (1) first mix 0.5 μm silicon carbide powder with alumina and cerium oxide evenly, then mix the aforementioned premix with 25 μm silicon carbide powder, hydroxypropyl methylcellulose, polymethyl cellulose (2) Mix water, silica sol, and tung oil in proportion; (3) Mix the premixed (1) and (2) in proportion, knead and knead into mud ; (4) Extrude the mud through a mold to form a green body; (5) Dry the green body and calcinate it in the air at 750°C to remove organic matter such as hydroxypropyl methylcellulose and polymethyl methacrylate; (6 ) Burn the above-mentioned calcined support in an argon protection furnace, raise the temperature at 30°C / min to 1600°C, keep it for 1h, then raise the temperature at 30°C / min to 1800°C, keep it for 1h, and then raise the temperature at 30°C to 2100°...

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Abstract

The invention discloses an acid and alkali corrosion-resistant silicon carbide porous support. The acid and alkali corrosion-resistant silicon carbide porous support mainly comprises the mixture of coarse and fine silicon carbide powder particles, a liquid-phase sintering aid, a silica sol, a pore-forming agent, a lubricating agent and an organic bonding agent. The silicon carbide porous support is prepared through the following steps: mixing, performing extrusion molding on pug, degreasing by calcining at low temperature, and segmentally calcining at high temperature. All pores of the silicon carbide porous support prepared through the method are opened and have relatively good pore shapes; the silicon carbide porous support has the porosity of 35-55% and the bending strength of 40-110 MPa; after being corroded for 100 hours at 90 DEG C in a 20wt% sulfuric acid solution, the silicon carbide porous support has the strength retention of greater than 88%; after being corroded for 100 hours at 90 DEG C in a 20wt% sodium hydroxide solution, the silicon carbide porous support has the strength retention of greater than 92%.

Description

technical field [0001] The invention relates to the technical field of new materials, and further relates to the preparation technology of silicon carbide porous supports. Background technique [0002] Ceramic membranes have been more and more widely used in water treatment and high-temperature flue gas treatment, and have played an important role in environmental protection. However, many problems have been exposed in the application process. The main problem of the existing ceramic membrane support body mainly made of alumina is that it is difficult to use it for a long time in a strong corrosive environment. [0003] Studies have shown that after corroding pure alumina porous supports in 10wt% sodium hydroxide solution at 100°C for 8 hours, their strength loss reached more than 80%, and after corroding in 20wt% sulfuric acid solution at 100°C for 8 hours, the strength also dropped by nearly 10%. %. The main reasons are: (1) The amphoteric characteristics of alumina esse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/565B01D69/10
Inventor 肖汉宁郭文明高朋召谢文刘井雄曾光明
Owner HUNAN UNIV
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