Fabrication and characterization of microwave sintered PM Fe-Cr-Y2O3 composite
This research is focused on assessing the feasibility of the innovative microwave sintering technology for fabricating iron – chromium composites via powder metallurgy route. The microwave sintered composites were compared with their conventionally sintered counterparts in terms of physical and m...
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| Format: | Thesis |
| Language: | English |
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| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/42992/1/P.1-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/42992/2/Full%20Text.pdf |
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| Summary: | This research is focused on assessing the feasibility of the innovative microwave
sintering technology for fabricating iron – chromium composites via powder metallurgy
route. The microwave sintered composites were compared with their conventionally
sintered counterparts in terms of physical and mechanical properties (micro Vickers
hardness and compressive strength). Microwave sintering is proved feasible to
consolidate the composite. The result also revealed that the microwave sintered iron
chromium composites possess improved density, micro hardness and compressive
strength compared to the conventionally sintered composites. Process evaluation also
revealed that microwave assisted sintering can lead to reduction of 70% of sintering
time when compared to conventional sintering. Another aims of this research is to study
the effect adding varying weight fraction of yttria reinforcement to the iron chromium
composites. For this purpose iron-chromium composites is reinforced with 5, 10, 15 and
20 wt.% of the ceramic particulates. From the study it is observed that the mechanical
properties of microwave sintered iron – chromium composites improved with the
addition of 5 wt.% ceramic content. For the conventional sintered composites, highest
micro hardness and compressive strength were obtained from the 10 wt.% reinforced
composites.The highest hardness value is given by microwave sintered composite.
Other physical properties such as density was decreased as the reinforcement content
increased. This is due to the increasing presence of porosity in the composites.
However, microwave sintered composites exhibit better density relative to theoretical
density and densification behaviour. |
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