Best describes how these factors affect the quality of metal powder injection molding sinteringtime：2020-06-28Views：509 Author：Best Seiko
Metal powder injection molding (MIM) is a technology that uses metal powder (or a mixture of metal powder and non-metal powder) as a raw material to produce metal materials, composite materials, and various types of products after molding and sintering. The metal powder injection molding method is somewhat similar to the production of ceramics; therefore, a series of new metal powder injection molding techniques can also be used to prepare MIM ceramic case materials. Due to the advantages of metal powder injection molding technology, it has become the key to solving the problem of new MIM materials, and plays a key role in the development of new MIM materials. So, what are the factors that affect the quality of metal powder injection molding (MIM) sintering? The following is a brief explanation by the editor of Shenzhen Best Seiko. Many factors that affect the performance of the sintered body, namely the characteristics of the powder, molding and sintering conditions. Factors of sintering conditions include heating rate, sintering temperature and time, cooling rate, sintering atmosphere and pressure conditions. The sintering temperature and time can affect the porosity, density, strength and hardness of the sintered body. High sintering temperature and long heating time will reduce the performance of the product and cause scorch defects. At the same time, low sintering temperature or long heating time may cause performance degradation due to the sintering process. The sintering atmosphere usually used for metal powder injection molding is to reduce the atmosphere, vacuum, hydrogen atmosphere, etc. The sintering atmosphere directly affects the performance of the sintered body. Sintering in a reducing atmosphere can prevent the burning of compacts and allow the reduction of surface oxides. For example, iron and copper-based products usually use gas or ammonia to decompose, while cemented carbide and stainless steel usually use pure hydrogen. Active metals or refractory metals (such as beryllium, titanium, zirconium, tantalum), hard alloys containing Tic alloys and stainless steel can be used for vacuum sintering. Vacuum sintering can avoid harmful ingredients (H2O, O2), metal powder injection molding sintering method liquid phase sintering If there are two or more components in the powder compact, sintering may occur above the melting point of the components, thereby This results in a small amount of liquid phase in the powder compact. Pressure sintering applies pressure to the powder during sintering to promote the densification process. Sometimes pressure sintering and hot pressing are synonymous, but hot pressing refers to the process of directly obtaining the product after powder molding and sintering. Active sintering not only improves the performance of the sintered body, but also uses some physical or chemical measures to significantly reduce the sintering temperature and reduce the sintering time. Activated sintering When the powder is introduced into the compaction process, direct current (DC) and pulsed power are used to create an arc between the powder particles. Then the sintering process begins. During the sintering process, pressure is gradually added to the workpiece to combine the forming and sintering of these two processes.
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