Self-Propagating High-Temperature Synthesis of Iron Aluminides
(2014) In Examensarbeten FKM820 20141Materials Engineering
- Abstract
- Materials and component production steadily needs to become more effective since newer projects might have a finite amount of resources. The reasoning why powder metallurgy and particulate materials processing is chosen as a topic for this thesis is because of the potential to minimize the manufacturing waste. Instead of utilizing wasteful cutting and grinding processing steps to gain the final shape, powder processing aims to minimize the waste by producing near net shaped products. These in turn can be sintered to form comparatively strong components with less waste and often faster processing times. By sintering the component less heat is needed for formation which reduces production costs.
Because of this a fundamental knowledge... (More) - Materials and component production steadily needs to become more effective since newer projects might have a finite amount of resources. The reasoning why powder metallurgy and particulate materials processing is chosen as a topic for this thesis is because of the potential to minimize the manufacturing waste. Instead of utilizing wasteful cutting and grinding processing steps to gain the final shape, powder processing aims to minimize the waste by producing near net shaped products. These in turn can be sintered to form comparatively strong components with less waste and often faster processing times. By sintering the component less heat is needed for formation which reduces production costs.
Because of this a fundamental knowledge regarding which powder products can be used for the industry is needed. The iron aluminide system has been seen as a viable candidate in high temperature alloy components which also are resistant to oxidation as well as sulphurization. The study focuses on the influence of particle size and heating rate on the intermetallic phase formation during reactive sintering. Differentiations during sintering which will be analyzed are: exothermic behavior, phase changes, onset temperature of the exothermic reaction, and possible density changes.
This thesis shows thermal data which exhibit a single exothermic behavior for when sufficiently small iron particles is used for self-propagating high temperature synthesis. This is differentiated from the two peak exothermic reaction which can be seen in other studies for coarser particle size. Both energy-dispersive x-ray spectroscopy as well as x-ray diffraction were used to characterize phase changes post processing. It was identified that for finer particle mixtures a near complete FeAl phase could be achieved with a heating rate of 7.5 K/min without holding at or above 1000oC. It was shown that for a slower heating rate a higher sintered density and lower swelling was obtained. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/4358081
- author
- Corneliusson, Jacob
- supervisor
-
- Krystof Turba LU
- Hossein Sina LU
- Srinivasan Iyengar LU
- organization
- course
- FKM820 20141
- year
- 2014
- type
- H2 - Master's Degree (Two Years)
- subject
- publication/series
- Examensarbeten
- report number
- ISRN LUTFD2/TFMT --14/5044--SE
- language
- English
- id
- 4358081
- date added to LUP
- 2016-01-26 14:47:47
- date last changed
- 2016-01-26 14:47:47
@misc{4358081,
abstract = {{Materials and component production steadily needs to become more effective since newer projects might have a finite amount of resources. The reasoning why powder metallurgy and particulate materials processing is chosen as a topic for this thesis is because of the potential to minimize the manufacturing waste. Instead of utilizing wasteful cutting and grinding processing steps to gain the final shape, powder processing aims to minimize the waste by producing near net shaped products. These in turn can be sintered to form comparatively strong components with less waste and often faster processing times. By sintering the component less heat is needed for formation which reduces production costs.
Because of this a fundamental knowledge regarding which powder products can be used for the industry is needed. The iron aluminide system has been seen as a viable candidate in high temperature alloy components which also are resistant to oxidation as well as sulphurization. The study focuses on the influence of particle size and heating rate on the intermetallic phase formation during reactive sintering. Differentiations during sintering which will be analyzed are: exothermic behavior, phase changes, onset temperature of the exothermic reaction, and possible density changes.
This thesis shows thermal data which exhibit a single exothermic behavior for when sufficiently small iron particles is used for self-propagating high temperature synthesis. This is differentiated from the two peak exothermic reaction which can be seen in other studies for coarser particle size. Both energy-dispersive x-ray spectroscopy as well as x-ray diffraction were used to characterize phase changes post processing. It was identified that for finer particle mixtures a near complete FeAl phase could be achieved with a heating rate of 7.5 K/min without holding at or above 1000oC. It was shown that for a slower heating rate a higher sintered density and lower swelling was obtained.}},
author = {{Corneliusson, Jacob}},
language = {{eng}},
note = {{Student Paper}},
series = {{Examensarbeten}},
title = {{Self-Propagating High-Temperature Synthesis of Iron Aluminides}},
year = {{2014}},
}