By G S Upadhyaya
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Extra resources for Powder Metallurgy Technology
3 Effect of single collision between two balls on trapped powder. 3 illustrates the effect of a single high energy collision between two balls or powder trapped between them. The ductile elemental metal powders are flattened, and where they overlap, the atomically clean surfaces just created weld together, building up layers of composite powder, between which are trapped fragments of the brittle powder and the dispersoid. At the same time, work hardened elemental or composite powders fracture. These competing processes of cold welding and fracture occur repeatedly throughout the milling, gradually kneading the composites so that their structure is continually refined and homogenized.
2. S. Hirschhorn, Introduction to Powder Metallurgy, American Powder Metallurgy Institute, New York, 1969. 1 Annealing It is customary that the powder producer delivers the powder to the fabricator ready for mixing. The aims of annealing are: 1) to soften the powder 2) to reduce the residual amount of oxygen, carbon and/or nitrogen from the powder. The annealing operation may be done in an atmosphere furnace or a vacuum furnace. The former may be of batch or continuous type. The furnace construction is similar to that given in Chapter 6, which deals with sintering technology.
Because of the widespread use of this method, one distinguishes between particles which are larger than 44 micrometers and fines or subsieve powder that is smaller than 44 micrometers. 3 gives some of the most pertinent data for both the Tyler standard and United States sieve series. Micromesh sieves are also available with openings down to at least five micrometers, but are rather difficult to use and maintain, are very fragile and have low load capacities. These sieves are produced by electrodepositon of nickel or copper on to photosensitized machine ruled lines.