How to Improve Powder Metallurgy Products Sintering Quality?

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There are 2 factors that affect the quality of sintering are as follows

1. Sintering temperature and time The sintering temperature and the length of time affect the porosity, density, strength and hardness of the sintered body.

If the sintering temperature is too high and the time is too long, the performance of the product will be reduced, and even over-burning defects will occur; if the sintering temperature is too low or the time is too short, the performance of the product will decrease due to under-burning.

2. Sintering atmosphere The commonly used sintering atmosphere of powder metallurgy includes reducing atmosphere, vacuum, hydrogen atmosphere and so on.

The sintering atmosphere also directly affects the performance of the sintered body. Sintering in a reducing atmosphere prevents burning of the compact and can reduce surface oxides. For example, iron-based and copper-based products often use producer gas or decomposed ammonia, and cemented carbide and stainless steel often use pure hydrogen. Active metals or refractory metals (such as beryllium, titanium, zirconium, tantalum), hard alloys containing TiC and stainless steel can be vacuum sintered. Vacuum sintering can avoid the harmful effects of harmful components in the atmosphere (H2O, O2, H2), etc., and can also reduce the sintering temperature (generally, it can be lowered by 100-150°C).

Powder metallurgy is a process technology for preparing metal or using metal powder (or a mixture of metal powder and non-metal powder) as a raw material, forming and sintering, to produce metal materials, composite materials and various types of products.

Sintering equipment

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