By Asm International Handbook Committee, Peter W. Lee
Covers all components of powder construction, sampling, characterization, shaping, consolidation, sintering, qc, machining, warmth treating, and PM purposes. For functional engineering details on sintering practices, software layout, P/M metallography, dimensional keep watch over, half layout, powders, binders, lubricants, and the processing, houses, and function of P/M fabrics in several creation applied sciences and purposes.
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Extra resources for ASM Handbook: Volume 7: Powder Metal Technologies and Applications (Asm Handbook) (Asm Handbook) (Asm Handbook)
Will a repressing-resintering process be necessary to achieve the density selected? What secondary processing treatments are needed, and how will the density affect these processes? Using a standard press-and-sinter process as a baseline, the cost of high-temperature sintering may add a 10 to 20% premium, while a double-press/double-sinter process could result in as much as a 40% premium (Fig. 7). Therefore, the designer must recognize that selecting a material and density level leads directly to a processing cycle and the cost associated with the process.
This secondary densification step can be performed on the entire part or just specific features, for example, gear teeth. The sizing of P/M parts for improved dimensional tolerances is widely performed, especially for the manufacture of bearings. Impregnation and Infiltration. Several procedures are used to fill the residual porosity in conventional P/M parts. Oil impregnation adds an internal lubricant to the product, which is useful in bearing and wear applications. The part can be resin impregnated to seal the pores for pressure tightness and improved machinability or to prevent the intrusion of undesired plating chemicals.
An excellent source for additional details is the manual on P/M product design prepared by the Metal Powder Industries Federation (MPIF) trade association (Ref 8). Additional information on tooling and part design is also included in the article "Powder Metallurgy Presses and Tooling" in this Volume. Secondary Operations A variety of secondary manufacturing and finishing operations may be required to complete the part, to improve properties, or to calibrate dimensional tolerances. Because die-compacted parts have residual porosity that may affect the response to these secondary operations, several guidelines are provided in this section.
ASM Handbook: Volume 7: Powder Metal Technologies and Applications (Asm Handbook) (Asm Handbook) (Asm Handbook) by Asm International Handbook Committee, Peter W. Lee