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Knowledge of powder metallurgy (PM) process and sintering (3)

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4.1.5 Other treatment or processing after sintering

For some powder metallurgy products with higher requirements, other treatments and processing are needed after sintering to meet the requirements.

(1) Infiltration (also called infiltration)

The method of infiltrating low-melting metal or alloy into porous sintered products is called infiltration. Dense products are obtained by osmosis. This method can also be used for supplementary treatment of sintered bodies. When metal components do not dissolve in liquid phase, alloys can be formed through capillary action by osmotic method. The products obtained by osmotic method have high density, uniform and fine organization, general strength, product plasticity and impact resistance have been greatly increased. However, this process is expensive and takes a long time.

 (2)Re-press

Put sintered parts into pressing mold for pressing once more, called re-press. Re-pressure can play a certain role in shaping.

(3) Powder metal forging

Taking metal powder as raw material, make a certain shape and size green part by powder metallurgy, then heat the green part and place it into forging mold to forge required parts.

 (4) Precise Press

For some products, in order to ensure dimensional accuracy and further improve density, forging or stamping process is often carried out after sintering.

(5) Other follow-up treatment

PM products have a number of follow-up processes, such as oil immersion of bearing, machining, sandblasting, and sometimes necessary heat treatment.

According to technical requirements, production of powder metal parts can choose following process:

(1)Pressing + sintering;

(2) Pressing + sintering + repressing;

(3) Pressing + pre-sintering +precise pressing + sintering;

(4) Pressing + pre-sintering + precise pressing + sintering + repressing.

Under normal circumstances: the first process accounted for about 80%; However, there are many applications for the second procedure. The more complex third and fourth processes are only used for some special parts. In recent years, due to development of compactable powder materials and high wear-resistant die materials, high strength parts can be obtained by one time pressing.


Keywords in the article: powder metallurgy (PM)
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