Method for preparing high-performance pure crystal silicon carbide nano flat ceramic membrane

Abstract

The invention discloses a method for preparing high-performance pure crystal silicon carbide nano flat ceramic membrane. The method comprises the following steps: first, selecting high-purity 6H-SiC powder as a basic material, carrying out medium airflow shaping on materials of a support layer, a transition layer and an upper membrane layer, squeezing a green body of the support layer by adopting a piston-type squeezer and curing the green body of the support layer with a crawler-type vacuum microwave drying machine; squeezing pug of the transition layer onto the cured support layer, placing the pug into the crawler-type vacuum microwave drying machine, and then curing and sintering at high temperature; finally, spraying pug of the upper membrane layer on the transition layer by a plasma method. The preparation method disclosed by the invention can realize continuous production, the effects of energy conservation and environmental protection are obvious, the working environment is good, the aperture size, the flux permeability and the particle removal rate of the ceramic membrane can be excellently controlled, and no additive is remained after sintering; the finished product ceramic membrane can give full play to the own advantages of the physical and chemical properties of silicon carbide under the working conditions of high temperature, high salinity and strong corrosion, the separation accuracy is high, the regeneration capacity is strong, the service life is strong, and the ceramic membrane can be reused.

Description

technical field [0001] The invention relates to special industrial ceramics, in particular to a method for preparing a high-performance pure crystalline silicon carbide nano flat ceramic film. Background technique [0002] Ceramic membrane is a kind of solid-state membrane, which has many advantages such as high separation efficiency, stable effect, good chemical stability, acid and alkali resistance, organic solvent resistance, high temperature resistance, and simple separation process. The current ceramic membranes for solid-liquid and liquid-liquid separation are basically alumina hollow flat ceramic membranes, which are composed of an upper membrane layer, a middle transition layer and a bottom support layer stacked in sequence. Due to the complex and changeable manufacturing process of the existing flat ceramic membrane, the production cost is high and the product is easy to crack and deform, resulting in low yield; and the finished ceramic membrane has low porosity, di...

AI Technical Summary

Problems solved by technology

Due to the complex and changeable manufacturing process of the existing flat ceramic membrane, the production cost is high and the product is easy to crack and deform, resulting in low yield; and the finished ceramic membrane has low porosity, different pore sizes and uneven distribution, which makes the ceramic membrane. The filtration accuracy cannot meet the requirements, the effective filtration flux is low, the energy consumption is high, and the regeneration is difficult. When the temperature exceeds 80°C, the filtration effect will be lost, and the solid gas and solid liquid cannot be separated. When there is a pressure difference Afterwards, the ceramic membrane will be deformed, cracked or even broken.

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