What are the USES of the porous characteristics of powder metallurgy materials?

Porous is one of the important characteristics of powder metallurgy materials.
Using this feature, you can:
(1) make sweat material.
That is, in the pores of ordinary powder metallurgy material, it contains low melting point material, and when working at high temperature, it melts and exudes, making the material "sweat" to dissipate heat.
In this way, ordinary materials can be used to replace the expensive heat-resistant alloy and further improve the temperature of the heat resistant parts.
(2) make filtration materials.
It is used to filter gas, filtrate and filter poison etc.
(3) the bearing of oil and oil-free lubricants is made with the impregant;
Contain the spices, make the incense crafts and so on.
(4) in some cases iron is used instead of copper, lead and other nonferrous metals.
(5) manufacturing vibration reduction, noise reduction, insulation and other materials.
(6) increase the material ratio on the surface and use it as the carrier of the material (e.g. carrying the catalyst, etc.).