Method for preparing ceramic foams with pore gradient

Abstract

The invention relates to a method for preparing ceramic foams with pore gradient. The method comprises the following steps: arranging polymers or organic matter spheres to form a template in gradient distribution according to the design requirement, carrying out heating and pressurizing to ensure the spheres to adhere to each other to form a whole, filling the whole into a moulding mould and then injecting slurry for gel casting and removing the mould after drying the spheres to obtain a moulded green body integrating the spheres and solidifying slurry, immersing the green body after removing the mould into a solvent or warming the green body, removing the spheres to obtain a network-shaped body only with the solidifying slurry and obtaining the ceramic foams with pore gradient after binder removal and high-temperature sintering. The ceramic foams prepared according to the technical scheme adopted by the invention have the following advantages: the pore diameters are in gradient distribution; the pore gradient can be designed and controlled; the moulded green body has high strength and can be processed and cut into needed shapes; the sizes and shapes of the products are controllable; the problem that the shapes and sizes of the products as well as the sizes of the pores are usually limited by organic carriers in the process of preparing the ceramic foams is solved; and the shortcomings of less slurry absorbed for moulding, more blind pores and low product strength in the impregnation method are overcome.

Description

A kind of preparation method of pore gradient foam ceramics technical field The invention relates to a method for preparing a pore gradient foam ceramic material by using polymer balls with different particle diameters as molded body templates combined with a gel injection molding process, and belongs to the technical field of ceramic material preparation and processing. Background technique Foam ceramics (Ceramicfoams, also known as reticulated ceramics) is a kind of porous ceramics with a foam-like shape and a large pore size. It is the third generation of porous ceramics developed after ordinary porous ceramics and honeycomb porous ceramics. The open porosity of foam ceramics is as high as 70% to 90%, and it is a kind of porous structure ceramics with continuous network ceramic skeleton and three-dimensional continuous through holes. Gradient ceramic foams (Graded ceramic foams) refer to ceramics in which the pore size of the foam ceramic body decreases or increases reg...

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Problems solved by technology

However, at present, there is no report on the preparation process of the pore-gradient foamed ceramic material in the strict sense of being economical, reasonable and easy to manufacture.

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