密臀av,大胆亚洲成人社区,美国成人超碰在线播放,日韩操熟妇

Powder metallurgy raw material purity refers to the composition of the powder, if the metal powder in the atmosphere, chlorine content increased, then the suppression will be affected, and may have cracks, porosity and other defects appear. Therefore, in order to ensure a qualified compaction effect, the purity of the powder must be within the specified range, but also the powder can be pre-related treatment, so the effect will be improved.

The use of powder metallurgy technology directly to suppress the parts will be due to a lot of reasons for the entire process of pressing a great impact, in which the purity of the powder is one can not be ignored, so we can increase the degree of attention to the material a lot.

It is found that the pressing process of the metal powder has a certain relationship with the purity of the powder, and the purity of the powder is easier to suppress, that is, the purity of the powder has a great influence on its forming. Under normal circumstances, if the purity There will be more impurities inside the lower powder, and most of the impurities are present in the form of fluoride, which will make the powder metallurgy products become crisp and hard, in the process of pressing encountered Resistance will be increased, so that the use of powder metallurgy technology for the lower purity of the material to suppress the effect is not very satisfactory.