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DEVELOPMENT OF TEMPERATURE HEATING RATE DIAGRAMS FOR THE PYROLYTIC REMOVAL OF BINDER USED FOR POWDER INJECTION-MOLDING

PINWILL, IE; EDIRISINGHE, MJ; BEVIS, MJ; (1992) DEVELOPMENT OF TEMPERATURE HEATING RATE DIAGRAMS FOR THE PYROLYTIC REMOVAL OF BINDER USED FOR POWDER INJECTION-MOLDING. J MATER SCI , 27 (16) 4381 - 4388.

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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.

Type: Article
Title: DEVELOPMENT OF TEMPERATURE HEATING RATE DIAGRAMS FOR THE PYROLYTIC REMOVAL OF BINDER USED FOR POWDER INJECTION-MOLDING
Keywords: MOLDING FORMULATIONS, CERAMIC MOLDINGS, RHEOLOGY, BURNOUT
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/105947
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