Development of temperature-heating rate diagrams for the pyrolytic removal of binder used for powder injection moulding |
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Authors: | I. E. Pinwill M. J. Edirisinghe M. J. Bevis |
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Affiliation: | (1) Department of Materials Technology, Brunel University, UB8 3PH Uxbridge, Middlesex, UK |
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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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