Journal of Materials Science

, Volume 30, Issue 14, pp 3625–3632 | Cite as

Yield stress behaviour of metal injection moulding suspensions at elevated temperatures

  • M. L. Foong
  • K. C. Tam
  • N. H. Loh


Yield behaviour of metal injection moulding (MIM) feedstocks was studied using a cone and plate controlled stress rheometer. Four feedstocks consisting of 58 vol % carbonyl iron (with 2 wt % nickel) in different ethylene vinyl acetate (EVA):beeswax ratio binder systems were studied at six temperatures ranging from 130 to 180‡C. The yield stress was found by extrapolating to zero shear rate of the measured data obtained using a controlled stress rheometer over low shear rate regime. The yield stress, ρy, was found to increase with decreasing temperature. An Arrhenius equation was used to relate the dependence of yield stress on temperature and the corresponding activation energy for yield, Ey, can be determined. For a given temperature, feedstocks with higher EVA content exhibited higher Τy and Ey. Moreover, the effect of temperature on yield stress was found to be greater for feedstocks with higher EVA content.


Activation Energy Carbonyl Shear Rate Arrhenius Equation Vinyl Acetate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • M. L. Foong
    • 1
  • K. C. Tam
    • 1
  • N. H. Loh
    • 1
  1. 1.School of Mechanical and Production EngineeringNanyang Technological UniversitySingapore

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