Factors affecting sintering quality of powder metallurgy products

Factors affecting sintering quality of powder metallurgy products

The impact on the sintering quality of powder metallurgy products is the content to be shared today, so why? Let's follow zhongwei's precision knitting to have a look.

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

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

2. Sintering atmosphere The commonly used sintering atmosphere for powder metallurgy includes reducing atmosphere, vacuum, hydrogen atmosphere, etc.

The sintering atmosphere also directly affects the properties of the sintered body. Sintering in reducing atmosphere can prevent the burning loss of compacts and reduce the 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. Vacuum sintering can be used for active metals or refractory metals (such as beryllium, titanium, zirconium, tantalum), cemented carbide containing TiC and stainless steel. Vacuum sintering can avoid the adverse effects of harmful components (H2O, O2, H2) in the atmosphere, and can also reduce the sintering temperature (generally 100~150 ℃).

To sum up, it is the factors that affect the sintering quality of powder metallurgy products. If you need to know more about powder metallurgy, please pay attention to the zhongwei precision official website.