The effect of wax composition on the injection molding of carbonyl iron powder with LDPE

K. C. Hsu, C. C. Lin, G. M. Lo

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The effect of waxes on the injection molding of carbonyl iron powder with low-density polyethylene (LDPE) have been examined. Four waxes, paraffin wax (PW), polyethylene wax (PEW), carnauba wax (CW) and acrawax (AW) were selected and compared. Experimental results indicated that the LDPE-rich phase was found to be separated from the wax-rich phase in the binder mixture containing AW, CW or PW. Polar AW or CW showed stronger interactions or adsorptions with iron powder than other nonpolar waxes. AW/LDPE and CW/LDPE mixtures appeared to exhibit higher viscosity, greater pseudoplasticity and lower flow activation energy than PW/LDPE and PEW/LDPE mixtures. Tensile bar specimens of all binder mixtures could be injection molded at an injection temperature of around 170-190 °C, and a pressure of around 5-6 MPa. Except for the PEW/LDPE mixture the parts derived from the other three binder mixtures showed good surface appearance following debinding and sintering. Specimens based on the PW/LDPE mixture exhibited the highest tensile strength in the resulting sintered parts, followed those based on CW/LDPE, AW/LDPE, and PEW LDPE mixtures. The difference in tensile strength of each part results from different flow properties of each wax/LDPE mixture.

    Original languageEnglish
    Pages (from-to)181-187
    Number of pages7
    JournalCanadian Metallurgical Quarterly
    Volume35
    Issue number2
    DOIs
    Publication statusPublished - 1996

    ASJC Scopus subject areas

    • Metals and Alloys
    • Industrial and Manufacturing Engineering

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