In order to overcome these problems,
several techniques (for the industry are unique) are applied. The surface
porous structure is often closed by infiltration. Additional free cutting is
usually required. Recently, design has been used to increase the cleanliness of
powder metallurgy and reduce heat treatment when improvement of oxide and
carbide powder production technology.
The surface of the porous structure
enclosed by metal (usually copper) or polymer infiltration completed. Once the
infiltration acts as a lubricant that, most of the experimental data show that
the real advantage is shut down to prevent the cutting edge of micro fatigue
surface of the porous structure and the. Vibration reduction to improve tool
life and surface finish. The use of the most dramatic infiltration showed that
when the porous structure of closed tool life increased by 200%.
Such as MnS, S, MoS2, MgSiO3 and BN and
other additives known to improve tool life. These additives by the chip more
easily from a workpiece separation, chip breaking and prevent bue and
lubrication cutting edge to improve machinability. Increase the quantity of the
additive can improve the workability but lower strength and toughness.
Powder atomization technology control of
sintering and heat treatment furnace gas to clean powder and parts production
possible, minimizing the occurrence of surface oxide inclusions and carbides.
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