Composite binder for preparing sintered porous body of silicon carbide powder and using method thereof

A silicon carbide powder and binder technology, applied in the chemical field, can solve the problems of high strength, good high temperature resistance and low bonding strength of silicon carbide porous body, and achieve easy low temperature removal, good high temperature resistance, high the effect of strength

Inactive Publication Date: 2010-03-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The binder can solve the problem of low bonding strength of aluminum metaphosphate in the process of pressing and forming at room temperature, so that the silicon carbide powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Dissolve aluminum hydroxide powder in 85% concentrated phosphoric acid at 140°C to obtain aluminum metaphosphate with a phosphorus-to-aluminum ratio of 23, add water and dilute to 5000 ml to obtain an aluminum metaphosphate solution with a concentration of 0.007 g / ml, add it to 7000 g In 10μm silicon carbide powder, stir evenly, dry at 200°C for 24 hours, pass through a 200 mesh sieve, add 1000 ml of polyvinyl alcohol aqueous solution with a concentration of 0.14 g / ml, grind evenly, dry at 80°C for 24 hours, and sieve (200 mesh), and then sintered at 800°C for 3 hours to obtain a silicon carbide porous body.

Embodiment 2

[0014] Dissolve aluminum hydroxide powder in 85% concentrated phosphoric acid at 140°C to obtain aluminum metaphosphate with a phosphorus-aluminum ratio of 23, add water and dilute to 5000 ml to obtain an aluminum metaphosphate solution with a concentration of 0.014 g / ml, add it to 7000 g In 10μm silicon carbide powder, stir evenly, dry at 200°C for 24 hours, pass through a 200 mesh sieve, add 1000 ml of polyvinyl alcohol aqueous solution with a concentration of 0.105 g / ml, grind evenly, dry at 80°C for 24 hours, and sieve (200 mesh), and then sintered at 800°C for 3 hours to obtain a silicon carbide porous body.

Embodiment 3

[0016] Dissolve aluminum hydroxide powder in 85% concentrated phosphoric acid at 140°C to obtain aluminum metaphosphate with a phosphorus-to-aluminum ratio of 23, add water and dilute to 5000 ml to obtain an aluminum metaphosphate solution with a concentration of 0.028 g / ml, add it to 7000 g In 10μm silicon carbide powder, stir evenly, dry at 200°C for 24 hours, pass through a 200 mesh sieve, add 1000 ml of polyvinyl alcohol aqueous solution with a concentration of 0.07 g / ml, grind evenly, dry at 80°C for 24 hours, and sieve (200 mesh), and then sintered at 800°C for 3 hours to obtain a silicon carbide porous body.

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PUM

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Abstract

The invention discloses a composite binder for preparing a sintered porous body of silicon carbide powder and a using method thereof. The composite binder comprises the components of aluminium metaphosphate and polyvinyl alcohol. The using method of the composite material comprises the following steps: firstly adding silicon carbide powder into water solution of the aluminium metaphosphate with the concentration of 0.007 to 0.056g/ml, drying at the temperature of 200 DEG C, sieving, then adding water solution of the polyvinyl alcohol with the concentration of 0.035 to 0.14g/ml, drying at the temperature of 80 DEG C, sieving, then die-pressing and molding, sintering and obtaining the porous body of silicon carbide; and the adding amount of the aluminium metaphosphate is 0.5 to 4wt% of thatof the silicon carbide powder, and the adding amount of the polyvinyl alcohol is 0.5 to 2wt% of that of the silicon carbide powder. The obtained molded blank of the silicon carbide has smooth surfaceand good molding quality. After being sintered for 3h at the temperature of 80 DEG C, the obtained porous body of the silicon carbide has high strength and good high temperature resistance.

Description

technical field [0001] The invention relates to a combined binder for preparing a silicon carbide powder sintered porous body and a use method thereof, belonging to the field of chemistry. Background technique [0002] Silicon carbide porous body has the characteristics of high specific surface area, high temperature resistance, corrosion resistance, high porosity, high strength and wear resistance, etc. It can be widely used in many industrial fields such as catalyst carrier, fluid purification, filtration, etc. Skeleton structure of composite materials. However, pure silicon carbide has a high sintering temperature and is difficult to sinter. In order to sinter at a lower temperature, it is usually necessary to add silicon dioxide or sodium silicate as a binder. When silica is used as a binder, the strength of the silicon carbide porous body is low; when sodium silicate is used as a binder, it is easy to diffuse to the surface layer with water during the drying process of...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/63C04B38/00
Inventor 陈康华祝昌军方华婵彭国胜
Owner CENT SOUTH UNIV
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