1 / 9

oee.nrcan.gc.ca

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)

zonta
Télécharger la présentation

oee.nrcan.gc.ca

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 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 .75*Tmelt • Particles bind together • Part shrinks in size • Density increases, up to 95% • Strength ~=~ Density • P/M (vs. Casting): • Mass produce small steel parts, net-shape • Less waste • Unusual “alloys” • Range of densities, porosity (adv or disadv) • Less energy use • But: Smaller parts and less complexity (2.5D) P/M net-shape gears are common, save machining time oee.nrcan.gc.ca

  2. Powder Metallurgy Slightly porous appearance is common Range of particle sizes www.buau.com.au www.parmaco.com

  3. 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

  4. Metal filters Powder Metallurgy: Porous Metals Oil-impregnated Porous Bronze Bearings nic.sav.sk www.ondrives.com www.hd-bearing.com

  5. Powder Metallurgy: Connecting Rods www.dps-performance.com Forged on left; P/M on right

  6. 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

  7. Powdered Metal Turbine blade-disk (“blisk”): 1 piece! www.ml.afrl.af.mil

  8. Conventional Forging vs. Forging of Powdered Metal blank (2nd op) DeGarmo

  9. References DeGarmo: E.P. DeGarmo et al, Materials and Processes in Manufacturing, Wiley, 2003.

More Related