oee.nrcan.gc.ca

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• Powder Metallurgy (P/M)
• Method
• Make fine metal powders and sort
• Mix powders to get alloy
• Iron alloys most common, also Bronze
• Compaction
• Powder is pressed into a green compact
• 20,000-100,000psi pressure
• Still very porous, 70 density
• May be done cold or warm (higher density)
• Sintering
• Controlled atmosphere no oxygen
• Heat to .75Tmelt
• Particles bind together
• Part shrinks in size
• Density increases, up to 95
• Strength Density

P/M net-shape gears are common, save machining
time
oee.nrcan.gc.ca
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Powder Metallurgy
Slightly porous appearance is common
Range of particle sizes
www.buau.com.au
www.parmaco.com
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Cermet cutting inserts for lathe
Powder Metallurgy Cermet cutting
tools (Ceramic-Metal composite)
www.kyocera-yashica.com.br
Cermet-tipped saw blade for long life
Microstructure ceramic particles in metal matrix
www.moldmakingtechnology.com
www.toolbarn.com
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Metal filters
Powder Metallurgy Porous Metals
Oil-impregnated Porous Bronze Bearings
nic.sav.sk
www.ondrives.com
www.hd-bearing.com
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Powder Metallurgy Connecting Rods
www.dps-performance.com
Forged on left P/M on right
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Powdered Metal Transmission Gear
www.chipm.com

• Warm compaction method with 1650-ton press
• Teeth are molded net shape No machining
• UTS 155,000 psi
• 30 cost savings over the original forged part

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Powdered Metal Turbine blade-disk (blisk) 1
piece!
www.ml.afrl.af.mil
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Conventional Forging vs. Forging of Powdered
Metal blank (2nd op)
DeGarmo
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References DeGarmo E.P. DeGarmo et al,
Materials and Processes in Manufacturing, Wiley,
2003.