Download ASM Handbook: Volume 7: Powder Metal Technologies and by Asm International Handbook Committee, Peter W. Lee PDF

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 sensible engineering details on sintering practices, instrument layout, P/M metallography, dimensional keep an eye on, half layout, powders, binders, lubricants, and the processing, houses, and function of P/M fabrics in numerous creation applied sciences and purposes.

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Read Online or Download ASM Handbook: Volume 7: Powder Metal Technologies and Applications (Asm Handbook) (Asm Handbook) (Asm Handbook) PDF

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Extra info for ASM Handbook: Volume 7: Powder Metal Technologies and Applications (Asm Handbook) (Asm Handbook) (Asm Handbook)

Sample text

The variety of finishing operations--machining, plating, deburring, joining--must also consider the effects of residual porosity. Improvements in machinability have been achieved through resin impregnation (seals the porosity) and by adding machinability aids to the original powder blend. Surface finishing may also require resin impregnation if the part density is low enough to allow entrapment of plating or finishing chemicals. These liquids can cause internal corrosion of the P/M part if allowed to penetrate the open porosity network.

Improvements in machinability have been achieved through resin impregnation (seals the porosity) and by adding machinability aids to the original powder blend. Surface finishing may also require resin impregnation if the part density is low enough to allow entrapment of plating or finishing chemicals. These liquids can cause internal corrosion of the P/M part if allowed to penetrate the open porosity network. For welding and brazing, precautions are necessary to ensure a sound joint (Ref 8). Material Selection Once the die-compaction processing method has been selected the designer must consider the product configuration and material requirements.

Both have been in service since July 1988. Fig. 4 MIM part (upper left) for an automobile ignition lock. The key forces the MIM part into contact with a security switch. Courtesy of SSI Technologies Fig. 5 (a) Single-piece MIM part that replaced (b) a two-piece automobile turn signal lever assembly. The smaller MIM part in (a) was the first version, while the larger MIM part is the finished version that replaced the two-part assembly shown in (b). I. Du Pont de Nemours & Company, Inc. Figure 4 shows the entire ignition lock and the MIM subcomponent.

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