Method for preparing silicon carbide honeycomb ceramics

Abstract

The invention discloses a method for preparing silicon carbide honeycomb ceramics. The method comprises the following steps of: 1) mixing bamboo charcoal micro-powder, silica sol, aluminum oxide, yttrium oxide and organic matter starch at a weight ratio of 70: 20: (1-5): (1-5): (1-8), so as to obtain honeycomb ceramics powder; 2) mixing and pugging: mixing water, polyvinyl alcohol and polyhydroxyethanol according to a weight ratio of 70: (10-20): (10-20), and uniformly stirring the components to obtain a solution; and mixing the solution with the honeycomb ceramics powder according to a weight ratio of 100: (65-80), fully mixing the mixture in a mixing machine at a normal pressure and temperature for 0.5-1 hour, and then aging the mixture at the normal pressure and temperature for 2-3 hours, so as to obtain slurry material; 3) carrying out extrusion molding; 4) drying; and 5) sintering. The silicon carbide honeycomb ceramics produced by the preparation method disclosed by the invention has the characteristics of controllable holes, high specific surface area, intensity meeting requirements, and the like.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide honeycomb ceramics, in particular to a method for preparing silicon carbide honeycomb ceramics with bamboo charcoal micropowder and industrial silica sol as aggregates. Background technique [0002] Honeycomb ceramics is a kind of porous functional material. As early as the 1970s, Corning Corporation of the United States began trial production. In 1975, the company had already used honeycomb ceramics to carry out small car exhaust purification tests, and obtained good effect. Honeycomb ceramics have high specific surface area and good physical and chemical stability. In addition, they also have low density, high permeability, good energy absorption performance, high temperature resistance, corrosion resistance, high chemical stability and dimensional stability, and easy regeneration. features. [0003] In recent years, with the continuous development of honeycomb ceramic preparation tech...

AI Technical Summary

Problems solved by technology

[0005] Conventional silicon carbide honeycomb ceramics are prepared by making pores. The high reaction temperature leads to an increase in cost, which is not conducive to the realization of production. As a result, the purification of automobile exhaust is not enough, the air pollution cannot be effectively controlled, and there are still sintering performance and porous structure. The contradiction between the materials, such as the material has many holes but the strength is not enough, and the high specific surface area cannot be provided under the premise of ensuring the strength, so choosing new raw materials and processes to prepare silicon carbide honeycomb ceramics has become a new research direction