Method for preparing SiC foam ceramic filter

Abstract

The invention relates to a method for preparing an SiC foam ceramic filter, which comprises the following steps: taking netted polyurethane foaming plastics as a ceramic carrier; respectively adding polyethyleneimine and carbinol into water, so as to prepare an activating water solution, wherein the content of the polyethyleneimine is 0.5%-0.8% and the content of the carbinol is 2%-4%; utilizing the activating water solution to perform activating treatment on the ceramic carrier; preparing slurry, wherein the slurry contains by weight part: 100 parts of SiC, 5-8 parts of silicon dioxide powder, 10-13 parts of aluminum oxide powder, 10-15 parts of lithium-based bentonite, 5-20 parts of binders and 40-55 parts of water; soaking the ceramic carrier subjected to the activating treatment into the slurry and fully absorbing the slurry by the ceramic carrier; drying the ceramic carrier which fully absorbs the slurry, thereby removing surplus slurry and forming a blank; and drying and roasting the blank, thereby forming the SiC foam ceramic filter. In the invention, the carbinol is added into PEI, so that the activating property of the activating agent is greatly increased, the PEI concentration is greatly reduced and the production cost of the SiC foam ceramic filter is lowered.

Description

technical field [0001] The present invention relates to SiC foam ceramics. More specifically, it relates to the preparation method of SiC foam ceramic filter. Background technique [0002] Foam ceramics is a new type of ceramic material developed in the 1970s. Due to its special porous three-dimensional network structure, it has the advantages of good permeability, large specific surface area, low density, high temperature resistance, corrosion resistance, and low thermal conductivity. The foam ceramic filter can effectively intercept inclusions in liquid metal and To improve the quality of castings, it is widely used in the field of filtering molten metal in the metallurgical industry. At present, the foam ceramic materials for metal filtration at home and abroad are mainly concentrated in Al 2 o 3 , cordierite and SiC and other materials, among which SiC ceramic foam has become one of the most widely used ceramic foam materials at home and abroad because of its better ...

AI Technical Summary

Problems solved by technology

At present, the commonly used binders mainly include phosphate, dextrin, silica gel, etc., using phosphate as a binder, it is easy to introduce impurities that do not meet the requirements in the metal molten slurry when used at high temperature; and dextrin as a food crop , should be used as little as possible; the price of silica gel is relatively high, which is not conducive to reducing costs, so it is also necessary to find other alternative binders to improve the performance of ceramic foam materials and further reduce production costs