Ceramic molding process - advantages and disadvantages of isostatic pressing

Release time：2024-09-11click：5

Isostatic pressing is to add granulated porcelain material into the mold. The mold material is generally plastic or rubber with a certain elasticity. Various conditions are applied to the mold in the isostatic press. Apply uniform pressure of tens to hundreds of MPa to compact the granulated porcelain material in the mold. There are two methods of isostatic pressing: cold isostatic pressing and hot isostatic pressing. Cold isostatic pressing is divided into two types: wet and dry.

Focus on cold isostatic pressing and dry bag isostatic pressing
Cold isostatic pressing
Cold Isostatic Pressing (CIP) technology usually uses rubber or plastic as the covering mold material at normal temperature, and uses liquid as the pressure medium. It is mainly used for molding powder materials for further sintering, forging or heating. The isostatic pressing process provides a green body. The general operating pressure is 100~630MPa.

Dry bag isostatic press
Dry bag isostatic pressing is relative, that is, the mold is not all in a dry isostatic press with a high-pressure liquid medium, but is semi-fixed, so the addition of the blank and the blank The removal is done in a dry state. When the dry mold bag is pressed and clamped by the upper and lower punches, high-pressure liquid is input to the surroundings of the dry mold bag, so that the powder is formed under uniform pressure.

Isostatic pressing is compared with traditional dry pressingMolding has the following advantages:

1. The density of the green body is higher, generally about 10% higher than that of dry pressing.
2. Able to produce larger or complex shapes.
3. The green body has good strength and is convenient for transportation and direct mechanical processing.
4. The density of the green body is uniform in all directions, the internal stress of the green body is small, and defects such as cracking and delamination of the green body are reduced, and the deformation of the sintered products is small.

Isostatic pressing also has the following disadvantages compared to traditional dry pressing:

1. The dimensional accuracy and surface roughness of the green body are low and require mechanical processing for final shaping, resulting in a low powder yield.
2. The process is more complicated than dry pressing molding and the production efficiency is low.
In summary, when selecting a powder molding process, the molding process needs to be comprehensively considered based on product size, quantity, and quality requirements. Most of the time, the advantages of both can be combined and the method of dry pressing first and then isostatic pressing can be used to obtain good density. , green body with high dimensional accuracy.

Quick Links

Xiamen Middia Biological Ceramic Technology Co.,Ltd

address

address：Room 305, No. 891 Fanghubei 2nd Road, Huli District, Xiamen City, Fujian Province, China

Telephone：86-15396283716
E-mail：1617844001@qq.com