What should be paid attention to when extruding industrial ceramics?

Ceramic factories have made tremendous achievements in processing industrial ceramics, and extrusion forming is also an essential step in processing. So, what should be paid attention to when extruding zirconia ceramics and industrial ceramics such as alumina? Let's take a look together.

Kezhong Ceramic Factory has made tremendous achievements in processing industrial ceramics, and extrusion forming is also an essential step in the process. So what should be paid attention to when extruding zirconia ceramics and industrial ceramics such as alumina? Let's take a look together.

Zirconia ceramic extrusion molding is the process of placing ceramic slurry with a plastic belly into an extruder, and applying extrusion pressure to the slurry to obtain the formed body through a machine nozzle with a certain shape. By changing the nozzle, various shapes of billets can be extruded. Extrusion molding has the advantages of low pollution, easy automation, continuous production, and high efficiency, but the structure of the extrusion nozzle is complex and requires high processing accuracy. In addition, due to the abundance of solvents and adhesives in the slurry, the shrinkage of the green body during drying and firing is significant, which affects its performance.

What are the requirements for the slurry during the extrusion molding of zirconia ceramics

The preparation of extrusion slurry requires high requirements for slurry during extrusion molding. The basic performance requirements for slurry that can be used for extrusion molding include:

1. The amount of solvent, plasticizer, and binder should be appropriate;

2. The slurry should be highly uniform, otherwise the quality of the billet formed by extrusion is not good.

3. The particle size of the powder is required to be relatively fine, and the particle shape is smooth. It is better to use powder milled with small grinding balls for a long time;

The key to preparing extrusion slurry is the plasticization of the slurry. Plasticization is the process of using plasticizers to make previously non plastic slurries plastic. Many raw materials for advanced ceramics do not have plasticity, so plasticization is necessary when using extrusion molding. Organic plasticizers typically consist of adhesives, plasticizers, and solvents

Because the interaction between the binder and various additives and the powder can affect the rheological behavior of the slurry and the colloidal properties of the powder surface, and ultimately affect the physical properties of the sintered products, especially the water-based slurry is prone to solid-liquid phase separation, leading to the extrusion pressure rising and the extruder blocking, the stability of the slurry must be improved to improve this situation.

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