Hot Isostatic Pressing (HIP) is an advanced material forming technology that can be used to manufacture metal matrix composite parts with complex shapes. The mechanical properties and machinability of the material are improved, and in the HIP process, the material is simultaneously subjected to high temperatures and high pressures in the same direction in a closed container. The pressure gas is an inert gas to avoid chemical reactions with the material, and argon is generally used. The chamber is heated, which leads to an increase in pressure inside the vessel. Many systems use the associated air pump to reach the necessary pressure level to apply pressure to the material from all directions.
Any material made of products have a certain service life, can not be used indefinitely, the root cause of material failure there are two, one is the internal structure of the material changes, that is, due to the interference of the external environment to change the composition of the material, the new composition can not reach the appropriate performance, the material then failed; another more common reason is that, due to the material internal residual impurities, small cracks, holes, etc., the formation of a sudden change in performance, we call it a material defect, in the working state of the material, for example, when the material is subjected to high temperature cycles and stress cycles, the location of the sudden change in performance will produce a stress concentration effect, and eventually the point produces fatigue. Another more common reason is that, due to residual impurities, small cracks, holes, etc., the formation of a sudden change in performance, we call it a material defect, in the working condition of the material, for example, when the material is subjected to high temperature cycles and stress cycles, the location of the sudden change in performance will produce a stress concentration effect, and eventually fatigue diffusion at the point, so that the material fracture failure. Any of the current conventional molding methods cannot directly eliminate the residual defects inside the material, and all require subsequent treatment processing.
As a special metal heat treatment process, HIP is currently the most effective heat treatment method to eliminate the internal defects of the material, and it is also the material forming method that makes the material with the least internal defects. Therefore, HIP is a routine machining step for important key components in various fields around the world.
To put it simply, it is to put the product of related materials into the hot isostatic press furnace after a treatment process, the outside of the product does not seem to have changed greatly, but the internal “qualitative” change has occurred, the internal pore filling, shrinkage defects, creep pores and internal cracks are non-existent, and the internal pores of the material/product can be removed by eliminating the pores through hot isostatic pressing treatment, and the change of the internal pores of the material/product from “have” to “no” can be completed.
HIP applications
At present, hot isostatic pressing technology is not only applied in casting processing, powder metallurgy, ceramic industry, but also in porous materials, near net shape, material bonding, plasma spraying, manufacturing high-end graphite and other fields.
The aviation sector is the most heard of, mainly in aircraft engines using near-net shape, such as blades, heat exchangers, etc.
In the automotive field, we can often see that some parts of traditional automobiles in the engine and gearbox are made of hot isostatic pressing to meet higher requirements.
The field of medical devices is a field where the application of hot isostatic pressing has developed rapidly in recent years, as shown in the figure for the production of medical device products and products used in surgery.
As well as whether there are micro or large pores in the 3D printing process, it will affect the microstructure after 3D printing, and the internal pores can be eliminated by hot isostatic pressing (HIP) treatment to achieve internal densification and increase the surface finish.
As the first civil hot isostatic pressing technology enterprise in China, Doevol Materials has always pursued to become a solution provider of metal consumables for highly wear-resistant threaded components in the industry.
Doevol Materials’ existing products are mainly aimed at the fields of extruders, granulators and injection molding machines, among which threaded components are an unavoidable topic in all fields.
The whole process of plastic extrusion is to use the extruder screw to transport, tamp, and further melt the plastic to make the plastic in a thorough and uniform melting situation, extrude from the die under working pressure, go through the forming machinery and equipment to shape, and then refrigerate to make the required products.
Therefore, the extruder is the main equipment of plastic extrusion, which determines the quality and production volume of the extrusion product, and the extruder is composed of the extruder screw, barrel, heating and refrigeration system, transmission device and control device. Among them, the extruder screw is an important component of the extruder, which plays a key role in the whole extrusion process of raw material transportation, tamping, melting, homogenization, charging, and pumping.
Each of the above steps has put forward a great challenge to the wear resistance and corrosion resistance of the extruder screw, and Hididing Materials uses hot isostatic pressing process and powder forming technology to make the threaded elements after processing and production to achieve higher wear resistance and corrosion resistance through the quenching and tempering of the materials.
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