The mechanical properties of die-compacted sintered
nickel compacts prepared from closely sized sieve fraction of
annealed Sherritt–Gordon wore determined
The properties, especially fatigue properties, were found to be dominated by the presence of film like porosity in
the grain boundaries. The occurrence of this porosity was at
the original particle boundaries and its form was attributed to botryoidal shape of the original powder particles.
A mechanism for the propagation of the fatigue crack
Several iron powders were carefully characterised.
Thin steel strip was prepared from these samples using a slurry
technique. Binder was used in the slurry to give coherent
strip before rolling. The properties of the green strip were found to be
affected by the particle size and particle size distribution
of the original powder. The presence of binder in the strip
contributed towards the green strength especially at high roll
strength was observed to develop quickly during
sintering, for sintering times of the order of sixty seconds
duration although little or no densification occurred.
Specimens of near-theoretical density were prepared by
re-rolling and re-sintering. Despite the high density of these
specimens the mechanical properties were poor.
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of the degree of Doctor of Philosophy at Loughborough University.
British Iron and Steel Research Association (BISRA).