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  • Prediction of viscosity and time-dependent properties of polyoxymethylene [Elektronski vir] : wax powder injection moulding binder using simple mixing rules
    Gonzalez-Gutierrez, Joamin ...
    Powder injection moulding (PIM) is a versatile technology that allows the manufacturing of complex parts from metal and ceramics in a reduced numbers of operations. PIM consists of mixing the ... selected powder and a polymeric binder, injecting this mixture in a mould, debinding and then sintering. From all the debinding techniques, catalytic debinding of polyoxymethylene (POM) is attractive since it shows high debinding rates and low risk of cracking. However, current POM-based binders have high viscosity which makes the injection moulding process difficult. A low molecular weight polymer, referred as wax, was added to POM and viscosity values were observed to decrease as the content of wax was increased from 0 to 16 wt.% by a maximum of 32%. On the other hand, a maximum increase in the values of creep compliance of 37% was observed. Therefore, a new formulation of POM plus 8 wt.% of added wax is suggested, since it seems to provide the most appropriate results: an average decrease in viscosity of 13% and an average increase in creep compliance of only 6%. It was observed that the measured viscosity values as a function of wax content can be predicted by a linear mixing rule at 210 °C, but not at 190 °C, while the creep compliance values can be predicted by a logarithmic mixing rule at -10 °C. This temperature dependence of the mixing rules could be related to the different structure the blend is able to form at different temperatures and thus requires further investigation.
    Vir: Engineeracademy.ru [Elektronski vir]. - ISSN 2227-3360 (No. 5, 2012, str. 58-63)
    Vrsta gradiva - e-članek
    Leto - 2012
    Jezik - angleški
    COBISS.SI-ID - 12759835

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