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Development of temperature-heating rate diagrams for the pyrolytic removal of binder used for powder injection moulding

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Abstract

A polypropylene-based binder system was used to injection mould test bars containing 65 vol% aluminium powder. Specimens, 3 and 6 mm thick, made from these bars were used for pyrolytic binder removal experiments in static air and nitrogen. The development of a carefully defined experimental procedure for the determination of the heating rate at which binder removal can be carried out at a given temperature without the creation of macro defects is fully described. The use of isothermal heat treatments during pyrolysis are also considered and results are presented as temperature-heating rate diagrams for each atmosphere and thickness investigated. These diagrams show a lower and an upper boundary. Defect formation occurs if the temperature-heating rate relationship lies between the boundaries. Near optimum binder removal schedules deduced from each diagram have been experimentally verified.

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Authors and Affiliations

  1. Department of Materials Technology, Brunel University, UB8 3PH, Uxbridge, Middlesex, UK

    I. E. Pinwill, M. J. Edirisinghe & M. J. Bevis

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  1. I. E. Pinwill
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  2. M. J. Edirisinghe
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  3. M. J. Bevis
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Pinwill, I.E., Edirisinghe, M.J. & Bevis, M.J. Development of temperature-heating rate diagrams for the pyrolytic removal of binder used for powder injection moulding. J Mater Sci 27, 4381–4388 (1992). https://doi.org/10.1007/BF00541570

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  • DOI: https://doi.org/10.1007/BF00541570

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