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The Advantages Of Powder Metallurgy
May 10, 2018

1. Most refractory metals and their compounds, pseudoalloys, and porous materials can only be manufactured by powder metallurgy. 2. Since the powder metallurgy method can be pressed into a green compact of final size, it does not require or requires subsequent mechanical processing, so it can greatly save metal and reduce product cost. When the product is manufactured by the powder metallurgy method, the loss of the metal is only 1-5%, and when it is produced by the general fused casting method, the metal loss may reach 80%. 3. Since the powder metallurgy process does not melt the material during the material production process, it is not afraid of mixing impurities such as deuterium and deoxidizer. Sintering is generally performed in a vacuum and a reducing atmosphere. It is not afraid of oxidation and will not give material. Any pollution, it is possible to make high-purity materials. 4. Powder metallurgy can ensure the correctness and uniformity of the material distribution ratio. 5, powder metallurgy suitable for the production of the same shape and a large number of products, especially high processing costs such as gear products, using powder metallurgy manufacturing can greatly reduce production costs. The basic process of powder metallurgy is: 1. Preparation of raw material powder. Existing methods of milling can be roughly divided into two categories: mechanical and physical chemistry. The mechanical method can be divided into: mechanical crushing and atomization; physical and chemical methods are divided into: electrochemical corrosion method, reduction method, chemical method, reduction-chemical method, vapor deposition method, liquid deposition method and electrolytic method. Among them, the most widely used methods are reduction method, atomization method and electrolysis method. 2. The powder is shaped into a compact of the desired shape. The purpose of molding is to obtain a compact of a certain shape and size, and to give it a certain density and strength. The molding method is basically divided into press molding and pressureless molding. The most widely used press molding is press molding. 3, the sintering of the compact. Sintering is a key process in the powder metallurgy process. The molded green compact is sintered to give the desired final physical mechanical properties. Sintering is further divided into unit sintering and multicomponent sintering. For solid-phase sintering of elementary and multicomponent systems, the sintering temperature is lower than the melting points of the metals and alloys used; for multiphase liquid-phase sintering, the sintering temperature is generally lower than the melting point of the refractory component, and higher than the fusible component. Melting point. In addition to ordinary sintering, there are special sintering processes such as loose sintering, melt immersion, and hot pressing. 4, after the product processing. The post-sintering treatment can be performed in various ways depending on the product requirements. Such as finishing, oil immersion, machining, heat treatment and plating. In addition, in recent years, some new processes, such as rolling and forging, have also been applied to the sintering of powder metallurgical materials and have achieved satisfactory results. The future development direction of powder metallurgy materials and products: 1. Representative iron-based alloys will develop into large-scale precision products and high-quality structural parts and components. 2. To manufacture a high-performance alloy that has a uniform microstructure and that is difficult to process and completely dense. 3. Use a reinforced densification process to make special alloys that typically contain a mixed phase composition. 4, manufacturing non-uniform material, amorphous, microcrystalline or metastable alloy. 5, the processing of unique and non-general forms or components of composite parts.