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156 results on '"Laoui T"'

25. Enhanced CVD-Graphene Sheet Transfer on a Zinc Oxide Ultrathin Film Using Wet Transfer Method for Solar Cell Application

Author

Abdelaal, A.F., Hossain, M.K., Ibrahim, A., Salhi, B., and Laoui, T.

Subjects
Fundamental Studies, New Materials and Concepts for Photovoltaic Devices
Abstract

35th European Photovoltaic Solar Energy Conference and Exhibition; 122-125, A hybrid structure of graphene sheets (GS) with ultrathin film of Zinc oxide (ZnO) is developed on glass substrates for thin film solar cell applications. ZnO is fabricated using RF sputtering technique. ZnO layer on glass was found to be very thin, ranging from 30 to 50 nm in thickness and transparent. Graphene film are synthesized on the Cu foils by using chemical vapor deposition method, and then transferred to the ZnO layer using wet transfer method. As-fabricated GS/ZnO hybrid structure was characterized using atomic force microscope and Raman spectroscopy to understand the effect of graphene layer on the ultrathin layer of ZnO.

Published
2018
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27. The Synthesis of Nanostructured WC-Based Hardmetals Using Mechanical Alloying and Their Direct Consolidation

Author

Al-Aqeeli, N., Saheb, N., Laoui, T., and Mohammad, K.

Subjects
Article Subject
Abstract

Tungsten carbide- (WC-) based hardmetals or cemented carbides represent an important class of materials used in a wide range of industrial applications which primarily include cutting/drilling tools and wear resistant components. The introduction and processing of nanostructured WC-based cemented carbides and their subsequent consolidation to produce dense components have been the subject of several investigations. One of the attractive means of producing this class of materials is by mechanical alloying technique. However, one of the challenging issues in obtaining the right end-product is the possible loss of the nanocrystallite sizes due to the undesirable grain growth during powder sintering step. Many research groups have engaged in multiple projects aiming at exploring the right path of consolidating the nanostructured WC-based powders without substantially loosing the attained nanostructure. The present paper highlights some key issues related to powder synthesis and sintering of WC-based nanostructured materials using mechanical alloying. The path of directly consolidating the powders using nonconventional consolidation techniques will be addressed and some light will be shed on the advantageous use of such techniques. Cobalt-bonded hardmetals will be principally covered in this work along with an additional exposure of the use of other binders in the WC-based hardmetals.

Published
2014
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30. Selectice laser sintering: state-of-the-art

Author

Kruth, Jean-Pierre and Laoui, T

Subjects
manufacturing processes
Abstract

ispartof: International Journal of Electrical Machining pages:7-17 status: published

Published
2001

35. Nanostructured materials for water desalination

Author

Humplik, T, primary, Lee, J, additional, O’Hern, S C, additional, Fellman, B A, additional, Baig, M A, additional, Hassan, S F, additional, Atieh, M A, additional, Rahman, F, additional, Laoui, T, additional, Karnik, R, additional, and Wang, E N, additional

Published
2011
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36. The Effect of Variable Binder Content and Sintering Temperature on the Mechanical Properties of WC–Co–VC/Cr 3 C 2 Nanocomposites.

Author

Al-Aqeeli, N., Mohammad, K., Laoui, T., and Saheb, N.

Subjects
TUNGSTEN carbide, METAL crystal growth, SINTERING, NANOCOMPOSITE materials, MECHANICAL alloying, BALL mills
Abstract

WC powders with an average crystallite size of 10 nm were successfully prepared by ball milling of micron-sized tungsten carbide powders. Grain growth inhibitors (VC and Cr3C2) with concentrations of 0.6 wt% each were added to nanocomposites of WC–9Co and WC–12Co, in both as-received and milled WC. Powder mixtures were then consolidated using spark plasma sintering technique at 1200 and 1300 °C for 10 min under high vacuum and pressure of 50 MPa. The influence of WC crystallite size, Co content, and sintering temperature over microstructure and mechanical properties of the resulting composites were studied through XRD and FESEM. Densification and attained grain sizes of the sintered products were measured by Archimedes principle and Scherrer procedure, respectively. Moreover, microhardness (Hv30) and fracture toughness were measured and compared for each composition to comparatively assess the individual effect. It was observed that the addition of VC and Cr3C2resulted in decreased densification of the synthesized composites. These grain growth inhibitors were found to limit grain sizes to 131 nm with an average hardness of 1592 Hv30and fracture toughness of 9.23 Mpam1/2. [ABSTRACT FROM PUBLISHER]

Published
2015
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