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Basic Processes and Application Fields of Powder Metallurgy

Basic Processes and Application Fields of Powder Metallurgy

Ⅰ. The basic process of powder metallurgy

1. Preparation of raw material powder

Existing milling methods are broadly classified into two types: mechanical methods and physical-chemical methods. Mechanical crushing and atomization are two subsets of the mechanical method; the physical-chemical method is further subdivided into electrochemical corrosion method, reduction method, chemical method, reduction-chemical method, vapour deposition method, and liquid deposition, and electrolysis method. The reduction method, atomization method, and electrolysis method are the most commonly used. Among them, the most widely used are the reduction method, atomization method and electrolysis method.

2. The powder molding compact of the required shape

The purpose of forming is to produce a compact of a specific shape and size and have a certain density and strength. The molding method is basically divided into pressure molding and pressureless molding. Compression molding is most widely used in compression molding. In addition, 3D printing technology can be used for the production of billets.

3. Sintering of briquettes

Sintering is a key process in the powder metallurgy process. The formed compact is sintered to obtain the required final physical and mechanical properties. Sintering is divided into unit system sintering and multi-system sintering. The sintering temperature for the unit system and the multi-component system is lower than the melting point of the metal and alloy used; for the multi-component system's liquid-phase sintering, the sintering temperature is generally lower than the melting point of the refractory component and higher than that of the fusible component—melting point. In addition to ordinary sintering, there are also special sintering processes such as loose sintering, immersion, and hot pressing.

4. Follow-up treatment of the product

The treatment after sintering can adopt various methods according to different product requirements, such as finishing, oil immersion, machining, heat treatment and electroplating. In addition, in recent years, some new processes such as rolling and forging have also been applied to the processing of powder metallurgy materials after sintering and have achieved ideal results.

Ⅱ. Application field of powder metallurgy process

Powder metallurgy related companies are mainly suitable for the production and research of parts and accessories in the automotive industry, equipment manufacturing, metal industry, aerospace, military industry, instrumentation, hardware tools, electronic appliances and other fields, production of related raw materials, auxiliary materials, and various powders Manufacturing equipment and sintering equipment. Products include bearings, gears, carbide tools, molds, friction products and so on. In military-industrial enterprises, heavy weapons and equipment such as armour-piercing bombs, torpedoes, etc., and brakes for aircraft and tanks need to be produced by powder metallurgy technology. Powder metallurgy auto parts have become the largest market in China's powder metallurgy industry in recent years, and about 50% of auto parts are powder metallurgy parts.

1. Application: (automobiles, motorcycles, textile machinery, industrial sewing machines, power tools, hardware tools. Electrical appliances, engineering machinery, etc.) various powder metallurgy (iron-copper-based) parts.

2. Classification: powder metallurgy porous materials, powder metallurgy antifriction materials, powder metallurgy friction materials, powder metallurgy structural parts, powder metallurgy tool, and die materials, powder metallurgy electromagnetic materials and powder metallurgy high-temperature materials, etc.

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