Compatibility studies in carbon fibre/nickel system
Compatibility studies in carbon fibre/nickel system
A fabrication procedure for the production of uniaxially aligned carbon fibre/nickel composites is described. The process involves coating the fibres with nickel by electrodeposition, followed by consolidation under heat (1,100°C) and pressure (14 to 17-MN/m2) in. graphite dies. The effects of pre-compaction vacuum annealing treatments at 500 to 1,000°C and of the heating rate during hot pressing on the microstructural stability of composites are considered. The relative stabilities of fibres of type I (untreated and surface treated respectively) and type II (untreated and surface-treated respectively) in such composites are assessed.Oxidation experiments involving heating type I untreated carbon fibre/nickel composites to temperatures up to 1,000°C in air are described and their effects measured and discussed in terms of weight losses and microstructural changes.The mechanical testing of composites (containing fibres of types I_and II untreated and surface-treated respectively) is described. The effects of fabrication variables and fibre type and surface condition on the flexural strengths of composites are considered. The part played by tasting temperature and oxidation treatment in determining the energy absorption values obtained from miniature Charpy impact tests is described.Compatibility in the carbon fibre/nickel system with respect to both the morphological stability of the fibres and their mechanical compatibility with the matrix is discussed in relation to the data obtained in the present series of experiments and those determined by other investigators.An increase in the oxygen (or. possibly nitrogen) partial pressure is shown tolower the maximum temperature at which carbon fibres are stable in contact with nickel. Type I fibres are shown to be more stable in contact with nickel than type II fibres under similar conditions of temperature and pressure, and this is tentatively attributed to the higher, forming temperature characteristic of type I fibres.
University of Southampton
1975
Ormiston, Peter Linn
(1975)
Compatibility studies in carbon fibre/nickel system.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
A fabrication procedure for the production of uniaxially aligned carbon fibre/nickel composites is described. The process involves coating the fibres with nickel by electrodeposition, followed by consolidation under heat (1,100°C) and pressure (14 to 17-MN/m2) in. graphite dies. The effects of pre-compaction vacuum annealing treatments at 500 to 1,000°C and of the heating rate during hot pressing on the microstructural stability of composites are considered. The relative stabilities of fibres of type I (untreated and surface treated respectively) and type II (untreated and surface-treated respectively) in such composites are assessed.Oxidation experiments involving heating type I untreated carbon fibre/nickel composites to temperatures up to 1,000°C in air are described and their effects measured and discussed in terms of weight losses and microstructural changes.The mechanical testing of composites (containing fibres of types I_and II untreated and surface-treated respectively) is described. The effects of fabrication variables and fibre type and surface condition on the flexural strengths of composites are considered. The part played by tasting temperature and oxidation treatment in determining the energy absorption values obtained from miniature Charpy impact tests is described.Compatibility in the carbon fibre/nickel system with respect to both the morphological stability of the fibres and their mechanical compatibility with the matrix is discussed in relation to the data obtained in the present series of experiments and those determined by other investigators.An increase in the oxygen (or. possibly nitrogen) partial pressure is shown tolower the maximum temperature at which carbon fibres are stable in contact with nickel. Type I fibres are shown to be more stable in contact with nickel than type II fibres under similar conditions of temperature and pressure, and this is tentatively attributed to the higher, forming temperature characteristic of type I fibres.
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Published date: 1975
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Local EPrints ID: 462817
URI: http://eprints.soton.ac.uk/id/eprint/462817
PURE UUID: a27cefbc-ad37-43f8-a9b2-75571643b73c
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Date deposited: 04 Jul 2022 20:10
Last modified: 04 Jul 2022 20:10
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Author:
Peter Linn Ormiston
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