Method of preparing hot pressure casting porous ceramic using organic foam micro ball as perforating agent

Abstract

The present invention relates to a method for preparing porous ceramics by using organic foamed microspheres as pore-forming agent and adopting hot press moulding process, and said method includes the following steps: firstly, utilizing paraffin melt solution to soak the treated organic foamed microspheres, then uniformly mixing the ceramic powder body and biological glass adhesive, hot press moulding, dewaxing, removing plastics and sintering treatment so as to obtain the invented product. The described organic foamed microsphers are polystyrene foam spheres, polyurethane sphere and polyvinyl chloride foam spheres. Said invention has the features of high porosity, three-dimensional communication and high specific surface area.

Description

technical field [0001] The invention relates to a preparation method of porous ceramics. Background technique [0002] Porous ceramics have been extensively studied in recent decades due to their specific properties. At present, the methods for preparing porous ceramics mainly include the following: [0003] (1) Adding pore-forming agent process: This process is to add pore-forming agents to the ceramic powder, and use these pore-forming agents to burn out or volatilize at high temperature to leave pores in the ceramics. This method can produce porous products with complex shapes and different pore structures, but the porosity is not very high, and the uniformity of pore distribution is poor. [0004] (2) Foaming process: This process is to add organic or inorganic chemical substances to the ceramic components to form volatile gases during heat treatment, thereby generating foam, and then make porous ceramics after drying and firing. Compared with the foam impregnation me...

AI Technical Summary

Problems solved by technology

But there are also major disadvantages: First, the prepared porous ceramic structure is greatly affected by the structure of foam plastics.

[0010] (1) The process is complicated, the production cost is high, and the productivity is low;

[0011] (2) The shape density is not easy to control;

[0012] (3) The control of the pore size is not ideal, the order of the pores is poor, and the effect of the apparent porosity is not good.

[0013] (4) Difficult to be used in industrialized mass production

rolling 1. Can produce long and thin strip and foil 2. High productivity can be Continuous production 1. The shape of the product is simple 2. Coarse powder is difficult to add work Strips of various thicknesses, multi-layer filter isostatic pressing 1. The pores are evenly distributed 2. Suitable for large size products 1. Large size tolerance 2. Low productivity Large size pipes and different shaped products injection 1. Complicated shapes can be made Products 2. Air holes along the length Uniform direction distribution 1. Need to add more Plasticizer 2. The product size is large little restricted various complex shapes Small products slip casting 1. Can make complex shapes Products 2. Simple equipment 1. Low productivity 2. Raw materials are limited Complex shape products, many layer filter

Images