Powder metallurgy overall shortcomings:

1) There is always porosity inside the product;

2) the strength of ordinary powder metallurgy products than the corresponding forging or casting to low (about 20% to 30%);

3) due to the process of forming the powder flow is far less than liquid metal, so the shape of the product structure has some restrictions;

4) the pressure required for press forming is high, so that the product is limited by the capacity of the pressing equipment;

5) High cost of molding, generally only for batch or mass production. Metal powder: the quality of the final product is difficult to control freely; metal powder expensive; powder is not obedient to the law of hydraulics, leaving the product structure shape has certain restrictions.

Manufacturing equipment, methods:

1) Press: often need to use expensive powerful press

2) Die: a consumable, the higher the cost

3) Sintering furnace

4) powder easy to oxidation, mixing takes a long time

5) The size and shape of the product are limited.

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