Ceramic isostatic pressing process

    Isostatic pressing of ceramics (isostatic pressing), also known as hydrostatic pressing, is a molding method that utilizes the incompressibility of liquid media and uniform pressure transfer. That is, the pressure of the sample in the high-pressure container is the same as the pressure in the hydrostatic water at the same depth, so it is called hydrostatic pressure or isostatic pressing. The forming process obtained according to this principle is called hydrostatic forming. or isostatic pressing

1. The isostatic pressing method has the following characteristics:

(1) It can be formed, and the shape is complex, large and thin and long that cannot be produced by ordinary methods, and the forming quality is high.

(2) The molding pressure can be easily increased without increasing the difficulty of operation, and the pressure effect is better than other dry pressing methods.

(3) Since the green body is uniformly pressured in all directions, its density is large and uniform, and the firing shrinkage is small, so it is not easy to deform.

(4) The mold is easy to make, has a long life and low cost.

(5) Less or no binder can be used.

2. Advantages and disadvantages of isostatic pressing:

Advantages: high density, good quality, can be formed in large quantities

Disadvantages: high cost, unable to make special shapes

The operation process of isostatic pressing equipment is as follows: first, put the prepared blank into an elastic mold made of plastic or rubber, put it in a high-pressure container, after sealing, inject a high-pressure liquid medium, and transfer the pressure to the elastic mold to Billet plus jade. The pressure is then released to remove the mold, and the formed blank is removed from the mold. The liquid medium can be water, oil or glycerol. However, it is appropriate to use a medium with low compressibility, such as brake oil or anhydrous glycerin. The elastic mold material should be rubber or similar plastic with good elasticity and oil resistance.

3. Isostatic pressing method: There are two types of isostatic pressing method: cold isostatic pressing and hot isostatic pressing. Cold isostatic pressing is divided into wet isostatic pressing and dry isostatic pressing.

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