The cold isostatic pressing method is to put the pre-formed green body into the polyurethane isostatic pressing jacket of Hyderland and immerse it in a high pressure liquid to make it bear isotropic pressure, so as to strengthen the density of the green body. Cold isostatic pressing is only to obtain a green body with the highest possible density, which makes the sintering and densification of the green body easier.
As a molding process, isostatic pressing technology has the following characteristics compared with conventional molding technology:
1. The density of products formed by isostatic pressing is high, generally 5 to 15 higher than that of one-way and two-way pressing. The relative density of HIP products can reach 99.8%~99.09%.
2. The density of the compact is uniform. In compression molding, whether it is unidirectional or bidirectional pressing, the phenomenon of uneven density distribution of green compacts will occur. This density change can often reach more than 10% when pressing complex-shaped products. This is due to the frictional resistance between the powder and the steel die. An isostatic fluid medium transmits pressure, equal in all directions. The packing and the powder are generally compressed in the same way. There is no relative movement between the powder and the packing. The frictional resistance between them is very small, and the pressure only decreases slightly. This density gradient is generally less than 1%. Therefore, it can be considered that the blank The bulk density is uniform.
3. Because the density is uniform, the length-diameter ratio can be unlimited, which is conducive to the production of rod-shaped, tubular and thin and long products.
4. The isostatic pressing process generally does not need to add lubricant to the powder, which not only reduces the pollution to the product, but also simplifies the manufacturing process.
5. The products formed by isostatic pressing have excellent performance, short production cycle and wide application range.
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