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The control of fibre orientation in ceramic and metal composites by open-ended injection moulding

Zhang, T; Evans, JRG; Bevis, MJ; (1996) The control of fibre orientation in ceramic and metal composites by open-ended injection moulding. Composites Science and Technology , 56 (8) pp. 921-928. 10.1016/0266-3538(96)00055-3.

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Abstract

In conventional injection moulding of short-fibre-reinforced polymer-, ceramic-or metal-matrix composites, fibres tend to align in the flow direction near the surface but to present anisotropic orientation near the centre. This diminishes the fibre reinforcing effect and, in matrices which require sintering, may cause differential sintering and loss of shape. In this paper, a novel moulding technique is used in which the mould contains an opening through which material is expelled during filling and solidification. It is feasible in a manufacturing context where a two-barrel machine is available or in a single-barrel operation where recycling of waste is permissible. This method allowed mouldings to be made at low pressures without shrinkage defects. The fibres were oriented in the flow direction throughout small section mouldings and in large sections, the unoriented centre was reduced in size. Relaxation studies suggest that molecular orientation was also uniform throughout the section. © 1996 Elsevier Science Limited.

Type: Article
Title: The control of fibre orientation in ceramic and metal composites by open-ended injection moulding
DOI: 10.1016/0266-3538(96)00055-3
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/702559
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