Method for preparing high purity silicon carbide honeycomb ceramic body using nanometer silicon carbide as sintering adjuvant

Abstract

The invention relates to a high-pure SiC honeycomb-shaped ceramic catcher. Wherein, selecting pure SiC and nano SiC as porous ceramic aggregate and sinter auxiliary agent by ratio as 100: 1~15; using methylcellulose and tung oil as conjugation agent and plasticizer to prepare with proper water by ratio as 1: 1~3; obtaining the biscuit with extrusion molding technique with non-solid phase material within 13~31% by adjusting the ratio and quantity; dewatering the biscuit with first the microwave heating then the oven drying; removing the organic material in biscuit with normal heating means; using normal-pressure sinter to change the average size, auxiliary agent content and sintering temperature to realize the connected web distribution of the ceramic material.

Description

Technical field: [0001] The invention relates to a high-purity silicon carbide honeycomb ceramic trap for efficiently trapping diesel engine exhaust particles, belonging to the field of porous ceramic trap manufacture. Background technique: [0002] There have been a lot of research on the manufacturing method of honeycomb ceramics, and related patents have been published. For example, by adjusting the particle size of the raw material powder to control the grain boundaries of the grains so that they do not disappear during sintering and become porous ceramics with fine pores; by controlling the sintering temperature at a lower When sintering at a much lower temperature, the manufacturing method of porous ceramics that leaves some fine pores remaining; impregnating the slurry used as a porous ceramic aggregate with polymer foam, and then high-permeability porous ceramics are made by high-temperature treatment; There is also a preparation method by adding a synthetic resin f...

AI Technical Summary

Problems solved by technology

However, using the above-mentioned manufacturing method of porous ceramics, it is still very difficult to obtain a pure silicon carbide honeycomb ceramic body with adjustable micropore size and high honeycomb strength.

Specifically, if you want to use the method of adjusting the particle size of the raw material pure silicon carbide powder and sintering at a temperature much lower than the complete sintering temperature, you can produce pure carbon with the required appropriate porosity and pore size. For silicon ceramics, due to the difficult sintering characteristics of pure silicon carbide, the basic sintering process cannot be achieved at all, and a suitable microstructure cannot be obtained, let alone the preparation of higher strength pure silicon carbide honeycomb ceramics

In addition, due to the difficult sintering characteristics of pure silicon carbide, it is not feasible to use synthetic resin foam and combustible particles to adjust the space pores distributed between micron silicon carbide particles during the burning of volatile substances.