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Fabrication Of Tic-Reinforced Iron Based Composite Through Mechanical Activation And Carbothermal Reduction Of Hematite And Anatase

In this research, the influence of milling time and sintering temperature on TiCreinforced iron composite formation by carbothermal reduction of hematite (Fe2O3) and anatase (TiO2) mixture was investigated. Mixtures of Fe2O3, TiO2 and graphite powders with composition of Fe-30%TiC were mechanically...

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Main Author: Hassin, Mohd Salihin
Format: Thesis
Language:English
Published: 2012
Subjects:
TA404 Composite materials
Online Access:http://eprints.usm.my/41110/1/Mohd_Salihin_Bin_Hassin-24_Pages.pdf
http://eprints.usm.my/41110/
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spelling my.usm.eprints.41110 http://eprints.usm.my/41110/ Fabrication Of Tic-Reinforced Iron Based Composite Through Mechanical Activation And Carbothermal Reduction Of Hematite And Anatase Hassin, Mohd Salihin TA404 Composite materials In this research, the influence of milling time and sintering temperature on TiCreinforced iron composite formation by carbothermal reduction of hematite (Fe2O3) and anatase (TiO2) mixture was investigated. Mixtures of Fe2O3, TiO2 and graphite powders with composition of Fe-30%TiC were mechanically activated in a high energy ball mill at various milling times (0 hour-60 hours). X-ray diffraction (XRD) analysis of as-milled powder showed broadening of Fe2O3 peaks with disappearance of TiO2 and graphite peaks due to powder refinement and diffusion of graphite. Longer milling time resulted in a reduction of crystallite size of Fe2O3 down to nanometer range and an increment in both internal strain and dislocation density. After 60 hours milling, magnetite (Fe3O4) peaks appeared in the XRD pattern as a result of partial reduction of Fe2O3. The as-milled powder was compacted by cold pressing under 200 MPa and sintered in argon atmosphere at various sintering temperature (1100°C-1400°C). High temperature sintering resulted in formation of Fe and TiC phases as confirmed by X-ray diffraction and energy dispersive X-ray analyses. Without mechanically activated milling, the reaction to form TiC only occurred at 1400°C during sintering indicating a reduction of temperature has been promoted by mechanical milling. Fe-TiC composite prepared with longer milling time and higher sintering temperature (50 hours and 1400°C) showed the highest density and hardness which is due to the fineness of the composite powder, together with complete TiC and iron phases formation. Formation of Fe3O4 in the as-milled powder after 60 hours milling reduced the density and hardness of Fe-TiC composite as a result of pores formation in the composite. 2012 Thesis NonPeerReviewed application/pdf en http://eprints.usm.my/41110/1/Mohd_Salihin_Bin_Hassin-24_Pages.pdf Hassin, Mohd Salihin (2012) Fabrication Of Tic-Reinforced Iron Based Composite Through Mechanical Activation And Carbothermal Reduction Of Hematite And Anatase. Masters thesis, Universiti Sains Malaysia.
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
language English
topic TA404 Composite materials
spellingShingle TA404 Composite materials
Hassin, Mohd Salihin
Fabrication Of Tic-Reinforced Iron Based Composite Through Mechanical Activation And Carbothermal Reduction Of Hematite And Anatase
description In this research, the influence of milling time and sintering temperature on TiCreinforced iron composite formation by carbothermal reduction of hematite (Fe2O3) and anatase (TiO2) mixture was investigated. Mixtures of Fe2O3, TiO2 and graphite powders with composition of Fe-30%TiC were mechanically activated in a high energy ball mill at various milling times (0 hour-60 hours). X-ray diffraction (XRD) analysis of as-milled powder showed broadening of Fe2O3 peaks with disappearance of TiO2 and graphite peaks due to powder refinement and diffusion of graphite. Longer milling time resulted in a reduction of crystallite size of Fe2O3 down to nanometer range and an increment in both internal strain and dislocation density. After 60 hours milling, magnetite (Fe3O4) peaks appeared in the XRD pattern as a result of partial reduction of Fe2O3. The as-milled powder was compacted by cold pressing under 200 MPa and sintered in argon atmosphere at various sintering temperature (1100°C-1400°C). High temperature sintering resulted in formation of Fe and TiC phases as confirmed by X-ray diffraction and energy dispersive X-ray analyses. Without mechanically activated milling, the reaction to form TiC only occurred at 1400°C during sintering indicating a reduction of temperature has been promoted by mechanical milling. Fe-TiC composite prepared with longer milling time and higher sintering temperature (50 hours and 1400°C) showed the highest density and hardness which is due to the fineness of the composite powder, together with complete TiC and iron phases formation. Formation of Fe3O4 in the as-milled powder after 60 hours milling reduced the density and hardness of Fe-TiC composite as a result of pores formation in the composite.
format Thesis
author Hassin, Mohd Salihin
author_facet Hassin, Mohd Salihin
author_sort Hassin, Mohd Salihin
title Fabrication Of Tic-Reinforced Iron Based Composite Through Mechanical Activation And Carbothermal Reduction Of Hematite And Anatase
title_short Fabrication Of Tic-Reinforced Iron Based Composite Through Mechanical Activation And Carbothermal Reduction Of Hematite And Anatase
title_full Fabrication Of Tic-Reinforced Iron Based Composite Through Mechanical Activation And Carbothermal Reduction Of Hematite And Anatase
title_fullStr Fabrication Of Tic-Reinforced Iron Based Composite Through Mechanical Activation And Carbothermal Reduction Of Hematite And Anatase
title_full_unstemmed Fabrication Of Tic-Reinforced Iron Based Composite Through Mechanical Activation And Carbothermal Reduction Of Hematite And Anatase
title_sort fabrication of tic-reinforced iron based composite through mechanical activation and carbothermal reduction of hematite and anatase
publishDate 2012
url http://eprints.usm.my/41110/1/Mohd_Salihin_Bin_Hassin-24_Pages.pdf
http://eprints.usm.my/41110/
_version_ 1643710130740527104
score 13.211869

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