Isostatic Pressing Technology
The working principle of isostatic pressing technology is to put the pressed green body in a closed high-pressure cavity, the outer surface of the green body is covered with an elastic mold sheath, fill the high-pressure cavity with high-pressure liquid, apply a high pressure of hundreds of MPa, and the green body The body is subjected to uniform pressure in all directions and shrinks uniformly. After reaching the predetermined pressure and maintaining it for a certain period of time, a highly densified green body can be obtained. The green body after isostatic pressing has good strength and is convenient for machining. The compactness of the green body is good and uniform, and the mechanical properties are improved.
Compared with traditional dry pressing, isostatic pressing has the following advantages:
1. The green body has a higher density, which is generally about 10% higher than that of dry pressing.
2. It can make blanks with large size or complex shape.
3. The green body has good strength, which is convenient for handling and direct machining.
4. The density of the green body is uniform in all directions, and the internal stress of the green body is small, which reduces defects such as cracking and delamination of the green body, and the deformation of the sintered product is small.
Compared with traditional dry pressing, isostatic pressing also has the following disadvantages:
1. The dimensional accuracy and surface roughness of the green body are low, and it needs to be machined for final molding, and the powder yield is low.
2. The process is more complicated than dry pressing, and the production efficiency is low.
To sum up, when choosing a powder molding process, it is necessary to comprehensively consider the molding process according to the product size, quantity, and quality requirements. Most of the time, the advantages of the two can be combined, and the method of dry pressing first and then isostatic pressing can be selected to obtain good compactness. , High dimensional accuracy green body.
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