Application of PEG/PMMA Binder for Powder Injection Moulding of Hardmetals

Nutthita Chuankrerkkul; Hywel A. Davies; Peter F. Messer

doi:10.4028/www.scientific.net/MSF.561-565.953

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HomeMaterials Science ForumMaterials Science Forum Vols. 561-565Application of PEG/PMMA Binder for Powder...

Application of PEG/PMMA Binder for Powder Injection Moulding of Hardmetals

Abstract:

Powder injection moulding (PIM) is a cost effective powder metallurgical process for the fabrication of small, complex-shaped components for high performance applications. A binder system, which comprises a major fraction of polyethylene glycol (PEG) and a minor fraction of a very finely dispersed polymethyl methacrylate (PMMA), has been applied for tungsten carbide (WC) – cobalt (Co) hardmetal powders. PEG can be removed rapidly by water leaching and PMMA is removed by subsequent pyrolysis when the components are ramped up to the sintering temperature. In this work, the development of feedstock formulations and of the processing parameters for a successful injection moulding and to achieve high density has been investigated. The present study has demonstrated that the binder can be employed for the production of WC-Co hardmetal components by PIM process. The maximum density achieved thus far is 97% of the theoretical value.

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Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

953-956

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.953

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Online since:

October 2007

Authors:

Nutthita Chuankrerkkul, Hywel A. Davies, Peter F. Messer

Keywords:

Hard Metal, PEG/PMMA Binder, Powder Injection Molding (PIM), Tungsten Carbide-Cobalt

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