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- 저자 : Loayza, V?ctor (검색결과 2 건)
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Cast Aluminum Surface Reinforced with Carbon Nanotube via Solubilization Treatment
Paulo R. O. Brito,Cristhian R. L. Loayza,Mário E. S. Sousa,Eduardo M. Braga,Rômulo S. Angélica,Simone P. A. da Paz,Marcos A. L. Reis 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
Carbon nanotubes (CNTs) are noteworthy, as they reinforce the metallic matrix, due to mechanical properties, such asthe ~ 1.0 TPa Young module. To improve the maintenance of the commercially pure aluminum surface, multi-walled carbonnanotubes were incorporated into the aluminum surface with heat treatment by solid solubilization, in order to improvethe surface properties of aluminum. The aluminum samples were chemically attacked for 30, 60 and 120 s and placed in acontainer with CNTs, being subjected to a temperature of 640 °C for 1 h. Then, the roughness was evaluated by a roughnessmeter for morphology in the scanning electron microscopy. An intensity of aggregation of CNTs was evaluated by XRD, andthe Raman Spectra has evaluated the transfer of charge to the matrix. Microhardness was performed to evaluate the influenceof the incorporation of CNTs in the matrix. The results obtained show that the incorporation of CNTs in the aluminummatrix increases the hardness in approximately 20% of the surface, in comparison with the control sample. The process ofincorporating CNTs into the aluminum matrix by solubilization is a promising, simple and inexpensive alternative to improvethe durability of the aluminum surface.
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Final report of CCM key comparison of mass standards CCM.M-K6, 50 kg
J Abbott, Patrick,O Becerra, Luis,Borys, Michael,Davidson, Stuart,Jacques, Claude,Lee, Sungjun,Loayza, V?ctor,Malengo, Andrea,Medina, Ma Nieves IOP 2015 Metrologia Vol.52 No.-
<P>In order to show equivalence in mass standards calibration among National Metrology Institutes of member countries of the 'Comité international des poids et mesures' (CIPM), key comparisons of mass standards have been carried out under the auspices of the 'Comité Consultatif pour la Masse et les Grandeurs Apparentées' (CCM).</P> <P>This key comparison on 50 kg standards in standard stainless steel was based on the decision of the CCM during the 11th meeting held in April 2008 at the 'Bureau International des Poids et Mesures' (BIPM).</P> <P>For this key comparison CENAM—Mexico acted as pilot laboratory, and NPL—United Kingdom accepted to be co-pilot laboratory.</P> <P>The aims of this key comparison were to compare the results obtained by NMIs in calibration of 50 kg stainless steel weights and to repeat the exercise realized in 2001–2002 with the key comparison identified as CCM.M-K3. </P><P><B>Main text.</B> To reach the main text of this paper, click on <A HREF='http://www.bipm.org/utils/common/pdf/final_reports/M/M-K6/CCM.M-K6.pdf'>Final Report</A>. Note that this text is that which appears in Appendix B of the BIPM key comparison database <A HREF='http://kcdb.bipm.org/'>kcdb.bipm.org/</A>.</P> <P>The final report has been peer-reviewed and approved for publication by CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).</P>
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