Powder Metallurgy

Introduction:

 

 

•   Mix the metal powder 

 

Powders are made of Tungsten,Molybdenum,Rhenium,Tantalum,Niobium,Beryllium

 

 

•   Load the powder into a mould and then make pressure. 

 

This gives a compact which requires only to have sufficient cohesion to enable it to be handled safely and transferred to the next stage. 

 

 

•  Heat the compact

 

Under a protective atmosphere,  powder particles weld together and confer sufficient strength to the object for the intended use under the melting point.

 

Mixing:

 

Mixing is to provide a homogeneous mixture and to incorporate the lubricant

 

Lubricant is to reduce the friction between the powder mass and the surfaces of die walls, along which the powder must slide during compaction, thus assisting the achievement of the desired uniformity of density from top to bottom of the compact.

 

Pressing:

 

The mixed powders are pressed to a shape in a carbide die under pressures of 150-900 MPa.

 

Compacting:

 

Compacting is a critical operation in the Powder Metallurgy process because the final shape and mechanical properties are essentially determined by the level and uniformity of the as-pressed density.

 

To a large dgree,therefore satisfactory densities depends on press tool design

 

Sintering:

 

Sintering takes plaec in a cacuum furnace then powder particles are welded together and a strong finished part produced

 

Post Sintering:

 

Forging, Rolling, Drawing, Deep Processing, Joining, Coating