Powder Characterisation: Guidelines for Optimal Selection of Graphite Type for PM Parts

This work targets the selection of the graphite powder type for PM applications. The use of Graphite Powder has two main goals in PM parts production: steel matrix hardening, by Carbon diffusion into Iron particles, and decrease of the friction coefficient, by solid state lubrication. It is discusse...

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Published inEuropean Congress and Exhibition on Powder Metallurgy. European PM Conference Proceedings p. 1
Main Authors Alzati, Luigi, Gilardi, Raffaele, Zürcher, Simone, Pozzi, Giovanni, Fontana, Stefano
Format Conference Proceeding
LanguageEnglish
Published Shrewsbury The European Powder Metallurgy Association 01.01.2010
Subjects
Graphite
Lubricants & lubrication
Powder metallurgy
Sintering
Standard deviation
Studies
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Summary:This work targets the selection of the graphite powder type for PM applications. The use of Graphite Powder has two main goals in PM parts production: steel matrix hardening, by Carbon diffusion into Iron particles, and decrease of the friction coefficient, by solid state lubrication. It is discussed here how Graphite type and particles size distribution can affect flowability of the mix, dimensional change after sintering and mechanical properties of PM parts. Graphite particles size plays fundamental role in the production of Iron-based PM parts with low friction coefficient; both matrix reinforcement and uncompleted diffusion must be achieved: the PM valve guides case is briefly discussed. [PUBLICATION ABSTRACT]