The extrusion molding method involves uniformly mixing ceramic powder with an appropriate amount of binder, plasticizer, etc., and then feeding the mixture into an extruder. Under high pressure, the mixed material is extruded through a die to form a green body with regular honey - comb - shaped pores. This method has a mature process and is easy to control.

Main Processes:

1. Raw Material Preparation: 

Select suitable ceramic raw materials, such as cordierite, mullite, silicon carbide, etc., and grind them into fine powder. Meanwhile, prepare organic additives, such as binders and lubricants.

2. Batching and Mixing:

Mix the ceramic raw material powder and organic additives in a certain proportion and stir them evenly to make ceramic paste.

3. Extrusion Molding:

 Put the ceramic paste into the extruder and extrude it into a honey - comb structure by screw extrusion. The extruder is usually equipped with a die of a specific shape to control the porosity and size of the honeycomb ceramics.

4. Drying Treatment: 

Place the extruded honeycomb ceramic green body in drying equipment for drying treatment to remove moisture and improve the strength of the green body.

5. Sintering and Solidification: 

Put the dried honeycomb ceramic green body into a high - temperature sintering furnace for sintering and solidification treatment. The sintering temperature and time depend on the type of ceramic material and performance requirements, generally above 1000°C.

6. Post - treatment:

 Conduct post - treatment on the sintered honeycomb ceramic catalyst carrier, such as cutting, polishing, cleaning, etc., to obtain the required size and surface quality.