Nov. 09, 21
Powder sintering is a process of system free energy reduction, manifested by sintering neck and particle surface flattening, reduction of total surface area and surface energy of the system, reduction of total volume of voids and total surface area, and elimination of lattice distortion within the grains. The powder sintering process is formed by coupling surface diffusion, viscous flow, evaporative coalescence, bulk diffusion and grain boundary diffusion. We break down here to understand the process flow about metal powder sintering. Sintering Furnace manufacturer HAOYUE showa you.
Powder making is the process of making raw materials into powder, and the commonly used powder making methods are oxide reduction and mechanical methods.
Mixing is the process of mixing the various required powders in a certain ratio and homogenizing them to make a blank powder. There are three types of dry, semi-dry and wet, which are used for different requirements.
Forming is the process of mixing the homogeneous mixture and putting it into the press mold to make the billet with certain shape, size and density. The method of forming is basically divided into pressurized forming and non-pressurized forming. The most used method of pressurized molding is molded molding.
Sintering is the key process in powder metallurgy. After forming, the pressed billet is sintered to obtain the required final physical and mechanical properties. Sintering is divided into unit system sintering and multi-system sintering. In addition to general sintering, there are special sintering processes such as loose sintering, fusion dipping and hot pressing. We have spark plasma sintering furnace and vacuum atmosphere furnace for sale and welcome your enquiry.
The post-sintering treatment can be done in various ways depending on the product requirements. Such as finishing, oil dipping, machining, heat treatment and electroplating. In addition, in recent years, some new processes such as rolling and forging are also applied to the processing of powder metallurgical materials after sintering, achieving more desirable results.
There are many factors that affect the performance of the sintered body, including the characteristics of the powder, molding and sintering conditions, as well as external temperature and machine factors. Sintering temperature and time can affect the porosity, density, strength and hardness of the sintered body. High sintering temperatures and long heating times can reduce product properties and even lead to product scorching defects, while low sintering temperatures or long heating times may result in degraded properties due to the sintering process.
Sintering atmospheres typically used in powder metallurgy are reduced atmosphere, vacuum, hydrogen atmosphere, etc.; sintering atmosphere directly affects the properties of the sintered body; sintering in a reducing atmosphere prevents the burning of the briquettes and allows the reduction of surface oxides. For example, gas or ammonia decomposition is commonly used for iron and copper-based products, while pure hydrogen is commonly used for cemented carbide and stainless steel. Reactive or refractory metals (e.g., beryllium, titanium, zirconium, tantalum) and cemented carbides containing TiC alloys and stainless steels can be used for vacuum sintering.
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