Isostatic Pressing Technology for Powder Metallurgy

Isostatic Pressing Technology for Powder Metallurgy

    As an ancient metal smelting technology, powder metallurgy has obvious advantages in resource utilization. With the progress of the times, powder metallurgy technology is also constantly developing and improving. Isostatic pressing technology is an important component of modern powder metallurgy technology, and it is a new material forming method that occupies an important position in the industry.

   With the continuous improvement of the level of science and technology, the traditional powder metallurgy technology is gradually difficult to keep up with the requirements of the industry, and the entire metal industry is in a sluggish state. Isostatic pressing technology is a new material forming method that has emerged along with technological progress. It is an innovation of traditional powder metallurgy technology. Applying it to powder metallurgy will greatly shorten the time of material production and improve the yield of powder materials. Production efficiency and quality.

    Isostatic pressing technology is simply a technology that applies equal pressure to the surface-closed material from all directions. In powder metallurgy, this technology is mainly used for the consolidation and molding of powder materials. According to practice, the application of isostatic pressing technology in powder metallurgy has obvious technical advantages. First, this uniform pressure can make powder metallurgy materials denser and make them have higher strength; secondly, isostatic pressing technology can Reduce or even eliminate defects within materials; finally, this technology can also function as an adhesive, bonding dissimilar materials together at high temperatures. Due to the obvious advantages of isostatic pressing technology in the field of powder metallurgy, this technology has been widely used in the field of materials science and engineering. So far, products processed by isostatic pressing technology have been applied to industries with severe material requirements such as aerospace, mining machinery, artificial diamond, petrochemical and atomic energy. Under certain conditions, isostatic pressing technology can directly form alloy parts with geometric structure load, and the products produced by isostatic pressing powder metallurgy technology have better physical and mechanical properties. The application of isostatic pressing technology enables some powder metallurgy material products to replace casting metallurgical materials in terms of performance and service life, thereby reducing the use of casting technology and having a certain environmental protection effect.

Cold isostatic pressing

The static pressure technology is carried out at room temperature. The mold and material of the sheath are generally plastic or rubber, and certain substances are also required as the pressure medium. The elastic substances include rubber and plastic, and the inelastic substances include liquid. The substance called water isostatic pressing in cold isostatic pressing generally uses rust remover as the water medium, and oil isostatic pressing uses oil as the pressure medium. In addition, thick-wall molding or soft molding uses elastic materials to maintain balance. The preformed blank is formed by means of hot isostatic pressing or forging, and the final form of pressing is sintering.

Warm isostatic pressing

The temperature of the warm isostatic pressing device is required. The lower temperature is 80°C, and the higher temperature is 120°C. It is also possible for a slightly higher temperature. The highest temperature can reach 450°C, but under normal circumstances the temperature is 250°C. ℃, the transmission medium is generally set to oil. It should be noted that the control of the cooling process and the heating process needs to be set according to the process requirements to determine whether it will generate heat. The condition is that it is in a high-pressure cylinder and the temperature must be controlled in the cylinder. For heating measures, the oil tank is a relatively common heating tool. The choice of transfer medium is also important, usually choose the wet bag static press and equipment similar, and sometimes choose warm isostatic pressing, because the powder is difficult to form, and at room temperature, the forming conditions are There are many, choosing warm isostatic pressing is the best choice.

Hot isostatic pressing

Affected by the process of static pressing, the control of materials is greatly affected, and because the external conditions affected are high pressure and high temperature, when eliminating casting defects, two methods of bonding and diffusion will be selected as much as possible. Pressure The choice of transmission medium is generally inert gas. In another special case, it can be selected as the transmission medium for hot isostatic pressing, such as solid particles and liquid metal. When preparing glass and metal, the sheath is often The encapsulated material to be pressed will be selected. At this time, the main function of the static pressure device is to balance.

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