A Study On Tungsten-Copper Composites Produced Via Combination Of Liquid Phase Sintering And Liquid Infiltration Techniques

The low solubility between W and Cu elements makes it difficult to attain full density using the conventional sintering methods. In this work a unique method has been proposed to fabricate the W-Cu system, achieving excellent composite properties. The proposed new method combines the liquid phase si...

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Main Author:	Ahmed, Hafed Ibrahim Ihmida
Format:	Thesis
Language:	English
Published:	2014
Subjects:	TA404 Composite materials
Online Access:	http://eprints.usm.my/41275/1/HAFED_IBRAHIM_IHMIDA_AHMED_24_Pages.pdf
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id	my-usm-ep.41275
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spelling	my-usm-ep.412752018-08-10T07:20:59Z A Study On Tungsten-Copper Composites Produced Via Combination Of Liquid Phase Sintering And Liquid Infiltration Techniques 2014 Ahmed, Hafed Ibrahim Ihmida TA404 Composite materials The low solubility between W and Cu elements makes it difficult to attain full density using the conventional sintering methods. In this work a unique method has been proposed to fabricate the W-Cu system, achieving excellent composite properties. The proposed new method combines the liquid phase sintering and liquid infiltration and is named as the Copper-Melt Infiltration (Cu-MI) method. Base element powders of tungsten (W) and copper (Cu) and the additive elements of nickel (Ni), cobalt (Co) and iron (Fe) were used in this study. The additive elements were used as sintering activator in the range of 0.3-3 wt. %. The elemental powders were mixed manually in alumina mortar for 30 minute to produce composite powders. Thereafter, the mixture powder was compacted under different pressure (150-600MPa) and isothermally sintered at different temperature (1050, 1150 and 1250°C) as well as different atmosphere (vacuum, mixture of hydrogen and argon gas, pure argon gas and pure hydrogen gas). In the development of sintering approach, full density (>99% of theoretical density) of the sintered compact was achieved at low sintering temperature of 1150°C under hydrogen gas as protective furnace environment compared with low sintering density (not more than 89% of theoretical density) of the same sintered compact prepared by conventional liquid phase sintering. Using hydrogen gas as protective furnace environment gave the best outcome compared with others environment furnace. The electrical conductivity and hardness were enhanced using copper-melt infiltration method to fabricate the W-Cu green compact. Furthermore, Cu-MI consolidation method was employed to identify the advantages over conventional liquid phase sintering. 2014 Thesis http://eprints.usm.my/41275/ http://eprints.usm.my/41275/1/HAFED_IBRAHIM_IHMIDA_AHMED_24_Pages.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Bahan dan Sumber Mineral
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	TA404 Composite materials
spellingShingle	TA404 Composite materials Ahmed, Hafed Ibrahim Ihmida A Study On Tungsten-Copper Composites Produced Via Combination Of Liquid Phase Sintering And Liquid Infiltration Techniques
description	The low solubility between W and Cu elements makes it difficult to attain full density using the conventional sintering methods. In this work a unique method has been proposed to fabricate the W-Cu system, achieving excellent composite properties. The proposed new method combines the liquid phase sintering and liquid infiltration and is named as the Copper-Melt Infiltration (Cu-MI) method. Base element powders of tungsten (W) and copper (Cu) and the additive elements of nickel (Ni), cobalt (Co) and iron (Fe) were used in this study. The additive elements were used as sintering activator in the range of 0.3-3 wt. %. The elemental powders were mixed manually in alumina mortar for 30 minute to produce composite powders. Thereafter, the mixture powder was compacted under different pressure (150-600MPa) and isothermally sintered at different temperature (1050, 1150 and 1250°C) as well as different atmosphere (vacuum, mixture of hydrogen and argon gas, pure argon gas and pure hydrogen gas). In the development of sintering approach, full density (>99% of theoretical density) of the sintered compact was achieved at low sintering temperature of 1150°C under hydrogen gas as protective furnace environment compared with low sintering density (not more than 89% of theoretical density) of the same sintered compact prepared by conventional liquid phase sintering. Using hydrogen gas as protective furnace environment gave the best outcome compared with others environment furnace. The electrical conductivity and hardness were enhanced using copper-melt infiltration method to fabricate the W-Cu green compact. Furthermore, Cu-MI consolidation method was employed to identify the advantages over conventional liquid phase sintering.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ahmed, Hafed Ibrahim Ihmida
author_facet	Ahmed, Hafed Ibrahim Ihmida
author_sort	Ahmed, Hafed Ibrahim Ihmida
title	A Study On Tungsten-Copper Composites Produced Via Combination Of Liquid Phase Sintering And Liquid Infiltration Techniques
title_short	A Study On Tungsten-Copper Composites Produced Via Combination Of Liquid Phase Sintering And Liquid Infiltration Techniques
title_full	A Study On Tungsten-Copper Composites Produced Via Combination Of Liquid Phase Sintering And Liquid Infiltration Techniques
title_fullStr	A Study On Tungsten-Copper Composites Produced Via Combination Of Liquid Phase Sintering And Liquid Infiltration Techniques
title_full_unstemmed	A Study On Tungsten-Copper Composites Produced Via Combination Of Liquid Phase Sintering And Liquid Infiltration Techniques
title_sort	study on tungsten-copper composites produced via combination of liquid phase sintering and liquid infiltration techniques
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Bahan dan Sumber Mineral
publishDate	2014
url	http://eprints.usm.my/41275/1/HAFED_IBRAHIM_IHMIDA_AHMED_24_Pages.pdf
_version_	1747820900070195200

A Study On Tungsten-Copper Composites Produced Via Combination Of Liquid Phase Sintering And Liquid Infiltration Techniques

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