MEC 431 Lecture Notes - Lecture 21: Filler Metal, Capillary Action, Porosity
8 Jan 2018
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The term used when oil or other fluid is permeated into the pores of a. Common products are oil-impregnated bearings, gears, and similar. 27: )nfiltration filling the pores with molten metal to improve physical properties. action draws the filler into pores uniform density, as well as improved toughness and strength. The melting point of the filler metal must be below that of the pm part. Eg: babbitt bearings filled with tin or lead. Isostatic pressing - hydraulic pressure is applied from all directions to. Powder injection molding (pim) - starting polymer has 50% to 85: polymer is removed and pm part is sintered. Hot pressing - combined pressing and sintering shaping technology in powder metallurgy. Minimum quantities of 10,000 units suggested: pm is unique in its capability to fabricate parts with a controlled level. Porosities up to 50% are possible: pm can be used to make parts out of unusual metals and alloys.
