A method for preparing multi-level porous aluminum titanate mullite ceramics by microbial foaming

Abstract

The application belongs to the field of porous ceramic materials, and in particular relates to a method for preparing aluminum titanate-mullite composite porous ceramics by microbial foaming. In the prior art, the preparation of porous ceramic materials by adding yeast is often accompanied by the early fermentation of yeast, and the prepared multi-level porous ceramics are unevenly foamed, and impurities cannot be removed by vacuum, resulting in the collapse of the final fired ceramics and a decrease in mechanical strength. . The present application mixes the ceramic slurry and the fermented liquid under ice-bath conditions to inhibit the early fermentation of the yeast so that it can remove impurities by vacuum. In addition, adding a water reducer to the ceramic slurry reduces the amount of water used, improves the viscosity of the starch, and increases the foam stabilization ability during the fermentation process. During the preparation process, the degree of fermentation can be adjusted to obtain pores of corresponding size, and the preparation method of the present application can obtain porous ceramics with small pore diameters, which is of great significance for practical production.

Description

technical field [0001] The invention relates to the field of porous ceramic materials, in particular to a slurry formulation and a preparation method of aluminum titanate-mullite composite porous ceramics with a hierarchical porous structure. Background technique [0002] Aluminum titanate material is a material that integrates low expansion coefficient and high melting point. It is the best high temperature resistance among low expansion materials at present. It has the advantages of high melting point, good impact resistance and thermal shock resistance, etc., making it in It has great application potential under the condition of higher temperature and frequent cold and heat exchange. [0003] An important feature of porous ceramics is that they have more uniform and controllable pores. The pores can be divided into open pores and closed pores. The open pores have the functions of filtering, absorbing, absorbing, and echo elimination, while the closed pores are beneficial...

AI Technical Summary

Problems solved by technology

In view of the problems of uneven distribution of pores, uncontrollable pore size, and low mechanical strength in porous ceramics prepared by microbial foaming technology, this application adopts the method of mixing ceramic slurry and fermentation liquid in an ice bath environment to inhibit the early fermentation of yeast. Eliminates the violent foaming phenomenon in the process of vacuum removal of impurities, so that the ceramic slurry can be controlled and foamed to the same extent in the fermentation step

[0009] In order to increase the foam stabilizing ability and easy pouring of the slurry, and improve the viscosity and fluidity of the slurry, this application solves the problem of fluidity and viscosity of the slurry by adding a water reducer in the slurry preparation process

Images