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Effect of graphene nanoplates (GPNs) coated Ag on microstructure and mechanical properties of Al-cu alloy / Reham Ahmed Hany Elmetwally ; Supervised Abdelhaleem Mohamed Abdelhaleem Elhabak , Omayma Elkady

By: Contributor(s): Material type: TextTextLanguage: English Publication details: Cairo : Reham Ahmed Hany Elmetwally , 2020Description: 54 P. : charts , facsimiles ; 30cmOther title:
  • تأثير الجرافين المطلي فضة على التركيب المجهري والخصائص الميكانيكية لسبائك الالمونيوم و النحاس [Added title page title]
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Dissertation note: Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Mechanical Design And Production Engineering Summary: This work investigates the microstructural, mechanical and tribological properties of nanoaluminium powder and nano aluminum-15% nano copper alloy matrix reinforced with graphene (0.4-0.6-1.2-1.8 wt%). It{u2019}s known that there is a poor wettability between metals and ceramics therefore, to improve the poor wettability between the matrix aluminum and graphene and to inhibit the formation of AL4C3 phase that cause deterioration of the properties of the samples, the graphene was coated with Ag using electroless deposition technique that is now widely used in modifying the surface of various materials, such as non-conductors, semiconductors and metals, due to its low cost and its suitability for any profile of metallic or electrically non-metalic materials, And then the copper is precipitated on the GNPs coated Ag surface. The copper was prepared by using electroless deposition technique. All samples were mixed and then hot pressed at 550{uF0B0}C and 800 Mpa to obtain the proposed composites nearly free from internal porosity due to the use of hot pressing technique. Metallurgical, mechanical and tribological properties of the obtained composites were characterized using several tests such as microstructure observation (scanning electron microscope), relative density measurements, hardness test, wear test and compression test. The results have shown positive enhancements due to the GNPs reinforcement and also the new phases appeared on the XRD CU9AL4 and Al2O3 showed an observed enhancement in the result investigated. The microstructure of different samples showed dendritic structure and the larger the GNPs content the shorter the dendrite arm spacing which results in larger compression strength, larger hardness and higher wear resistance. This improvement is due to the extraordinary mechanical properties of the GNPs as reinforcement
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Item type Current library Home library Call number Copy number Status Date due Barcode
Thesis Thesis قاعة الرسائل الجامعية - الدور الاول المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.13.13.M.Sc.2020.Re.E (Browse shelf(Opens below)) Not for loan 01010110083102000
CD - Rom CD - Rom مخـــزن الرســائل الجـــامعية - البدروم المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.13.13.M.Sc.2020.Re.E (Browse shelf(Opens below)) 83102.CD Not for loan 01020110083102000

Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Mechanical Design And Production Engineering

This work investigates the microstructural, mechanical and tribological properties of nanoaluminium powder and nano aluminum-15% nano copper alloy matrix reinforced with graphene (0.4-0.6-1.2-1.8 wt%). It{u2019}s known that there is a poor wettability between metals and ceramics therefore, to improve the poor wettability between the matrix aluminum and graphene and to inhibit the formation of AL4C3 phase that cause deterioration of the properties of the samples, the graphene was coated with Ag using electroless deposition technique that is now widely used in modifying the surface of various materials, such as non-conductors, semiconductors and metals, due to its low cost and its suitability for any profile of metallic or electrically non-metalic materials, And then the copper is precipitated on the GNPs coated Ag surface. The copper was prepared by using electroless deposition technique. All samples were mixed and then hot pressed at 550{uF0B0}C and 800 Mpa to obtain the proposed composites nearly free from internal porosity due to the use of hot pressing technique. Metallurgical, mechanical and tribological properties of the obtained composites were characterized using several tests such as microstructure observation (scanning electron microscope), relative density measurements, hardness test, wear test and compression test. The results have shown positive enhancements due to the GNPs reinforcement and also the new phases appeared on the XRD CU9AL4 and Al2O3 showed an observed enhancement in the result investigated. The microstructure of different samples showed dendritic structure and the larger the GNPs content the shorter the dendrite arm spacing which results in larger compression strength, larger hardness and higher wear resistance. This improvement is due to the extraordinary mechanical properties of the GNPs as reinforcement

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