Special ceramic materials for sintered silicon carbide ceramic membranes

Abstract

The invention discloses a special-purpose ceramic material for sintering silicon carbide ceramics membranes. The ceramic material is prepared by using in-situ synthesized high-purity 6H-SiC crystal sand as raw materials; the preparation method comprises the following steps: firstly, crushing and shaping the raw materials to obtain 60 to 350 micron of granule materials of which the circularity is higher than 0.93; using negative-pressure induced air and a classified automated control system to shape again to obtain 160 to 280 micron of granule materials of which the circularity is higher than 0.95; using a fully automatic vibration sieve to perform secondary classification for the granule materials to obtain 170 to 230 micron of granule materials; performing physical magnetism elimination and washing fine division to obtain 170 to 190 micron and 190 to 230 micron of qualified micro powder materials of which the circularity is higher than 0.95. The silicon carbide ceramics membranes which are sintered by the materials can be used for the secondary filtration, concentration and gas separation of various media; The ceramic material is good in acid and alkali resistance and high in mechanical strength; the ceramic material has favorable properties of resistance to snap heat and cold; the self clean condition of the ceramic membranes is good, so that the ceramic membranes can be suitable for bacteria-free treatment and operation; the service life of the ceramic membranes is long, and the ceramic membranes are convenient to wash and reuse.

Description

technical field [0001] The invention relates to ceramic materials, in particular to a special ceramic material for sintering silicon carbide ceramic membranes. Background technique [0002] Ceramic membrane, also known as CT 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. At present, there are many kinds of materials used for sintering ceramic membranes, such as ceramic materials for sintering and filtering ceramic membranes of strong acids (sulfuric acid, nitric acid, hydrochloric acid), strong alkalis (sodium hydroxide, etc.) and various organic solvents, and ceramic materials for sintering high temperature resistant , ceramic materials with good resistance to rapid heat and rapid cooling, etc., due to the variety of raw materials, the sintered ceramic film will...

AI Technical Summary

Problems solved by technology

At present, there are many kinds of materials used for sintering ceramic membranes, such as ceramic materials for sintering and filtering ceramic membranes of strong acids (sulfuric acid, nitric acid, hydrochloric acid), strong alkalis (sodium hydroxide, etc.) and various organic solvents, and ceramic materials for sintering high temperature resistant , ceramic materials with good resistance to rapid heat and rapid cooling, etc., due to the variety of raw materials, the sintered ceramic film will have defects such as single use, complex and changeable manufacturing process, high cost and low yield due to the performance of raw materials

However, due to the use of abrasive grade silicon carbide raw materials in the existing silicon carbide ceramic membranes, the sintered silicon carbide ceramic membranes have low yield, low porosity, uneven pore size and uneven distribution, resulting in ceramic membranes that cannot reach the filtration accuracy. requirements, the filtration effect is lost under high temperature conditions, solid gas and solid liquid cannot be separated, and the silicon carbide ceramic membrane will be deformed, cracked or even broken when there is a pressure difference