Superiorities of Powder Metallurgy

Economic

1, While utilizing powder metallurgy to make parts, normally the wastage is around 1-5%. However, it will reach 80% in other conventional processings, such as forging, machining, etc.

2, The metal powders won’t be melted in the process of material production, which results in that the metal powders are free of impurities. And the sintering is carried out in vacuum or reduction atmosphere, so there is no oxidation and no pollution. For these reasons, the material in the PM can be very pure.

3, Powder metallurgy has a good uniformity, so is economically suited to mass production of complex parts, particularly gears.

Porosity

As we mentioned, the sintering is carried out in the reduction atmosphere, and the temperature is below the melting point of the basic metal, usually 2/3-3/4 of it. In sintering, the powders are mutually compacted. But there are still pores in the sintered parts. The porosity achieves low density, good shock resistance and permeability, which make sintered parts applied widely to filters, shock absorber, etc. Besides, PM could achieve oil-contained parts, and then make the parts free of other lubrication treatments.

In addition, we could infiltrate low-melting metal into the pores to improve strength, hardness, toughness, such as copper infiltration.