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Yield stress behaviour of metal injection moulding suspensions at elevated temperatures

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Abstract

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, E y, can be determined. For a given temperature, feedstocks with higher EVA content exhibited higher Τy and E y. Moreover, the effect of temperature on yield stress was found to be greater for feedstocks with higher EVA content.

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Authors and Affiliations

  1. School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Avenue, 2263, Singapore

    M. L. Foong, K. C. Tam & N. H. Loh

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  1. M. L. Foong
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  2. K. C. Tam
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  3. N. H. Loh
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Foong, M.L., Tam, K.C. & Loh, N.H. Yield stress behaviour of metal injection moulding suspensions at elevated temperatures. JOURNAL OF MATERIALS SCIENCE 30, 3625–3632 (1995). https://doi.org/10.1007/BF00351876

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