Examinando por Autor "Longo, Federico"

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Restringido
Characterization of Tribological Quasicrystalline Composite Coatings
(Deutscher Verband für Schweisstechnik, 2002-03-06) Román, A.; Agüero, A.; De Miguel, C.; García de Blas, Javier; Longo, Federico; Muelas Gamo, Raúl; Sánchez, A.
Quasicrystalline (QC) alloys constitute a family of materials with low coefficient of friction, high hardness, and high yield strength under compressive stress. This paper examines the characteristics of QC composite coatings deposited by LPPS and HVOF spraying. It compares the coatings based on phase distribution and microstructure. Both compositions studied are extremely wear resistant, but their friction properties require further development. Paper includes a German-language abstract.
Restringido
Observatory science with eXTP
(Springer Link, 2018-08-30) Zand, J. J. M.; Bozzo, Enrico; Qu, J.; Li, X. D.; Amati, L.; Chen, Y.; Donnarumma, I.; Doroshenko, V.; Drake, S. A.; Hernanz, M.; Jenke, P. A.; Reig, P.; Braga, J.; Lu., F.; Zhou, P.; Campana, R.; Lutovinov, A. A.; Fraschetti, F.; Sakamoto, T.; Mehdipour, M.; Baglio, C.; Chambers, F.; Men, Y.; Galloway, D. K.; Salvaterra, R.; Miller, M. C.; Bhattacharyya, S.; Miniutti, Giovanni; Gambino, A. F.; Santagelo, A.; Neubert, T.; Longo, Francesco; O´Brien, P. T.; Gandhi, P.; Schanne, S.; Pacciani, L.; Liang, E. W.; Ge, M.; Shao, L.; Paul, B.; Kunneriath, D.; Gendre, B.; Shore, Steven; De Martino, D.; Kuiper, L.; Gill, R.; Rossi, E. M.; Kreykenbohm, I.; Götz, D.; Wu, X.; Komossa, S.; Gouiffès, C.; Linares, M.; Keek, L.; Malzac, J.; Li, G.; Kawai, N.; McHardy, I.; Kargaltsev, O.; Mikusincova, R.; Kalemci, E.; Nardini, E.; Kaastra, J. S.; Osborne, Julian P.; José, J.; Papadakis, L. E.; Jonker, P. G.; Manousakis, A.; Mignani, R. P.; Nättilä, J.; Orlandini, M.; Paolillo, M.; Peretz, U.; Prescod Weinstein, C.; Rodríguez, Jerome; Rózanska, A.; De Rosa, A.; Vink, J. S.; Wang, J. J.; Wang, J. F.; Watts, A. L.; Weng, S.; Weinberg, N. N.; Wheatley, Peter; Wijnands, R.; Woods, T. E.; Woosley, S. E.; Suleimanov, V. F.; Strohmayer, T. E.; Stappers, B. W.; Shearer, A.; Schatz, H.; Savolainen, T.; Sanna, A.; Salmi, T.; Romano, P.; Riggio, A.; Perinati, E.; Ciolfi, R.; Pellizzoni, A.; Chenevez, J.; Paltani, Stéphane; Tauris, T. M.; Méndez, M.; Pérez Torres, Miguel; Wilms, J.; Svoboda, J.; D´aì, A.; Atteia, J. L.; Motch, C.; Andersson, N. A.; Thielemann, F. K.; D´Ammando, F.; Behar, E.; Mahmoodifar, S.; Belloni, T.; Tombesi, F.; Degenaar, N.; Blay, P.; Zingale, M.; Torres, D. F.; D´Elia, V.; Bucciantini, N.; Zhang, S.; Torresi, E.; Doyle, G.; Campana, S.; Zhang, S. N.; Turriziani, S.; Fan, X.; Zdziarski, A. A.; Vacchi, A.; Malyshev, D.; Zane, S.; Vercellone, S.; Maccarone, Thomas J.; Zampieri, L.; Rowlinson, A.; Zhang, X.; Yuan, F.; Stratta, G.; Yu, W.; Altamirano, D.; Younes, G.; Baykal, A.; Yan, Z.; Bilous, A.; Xu, Y.; Brown, E. F.; Xiong, S. L.; Sala, G.; Agudo, I.; Ballantyne, D. R.; Bianchi, S.; Brandt, S.; Cackett, E. M.; Cavecchi, Y.; Chen, Y. P.; Jin, C. C.; Cumming, A.; Grandi, P.; Granot, J.; Güdel, M.; Heger, A.; Heinke, C. O.; Homan, J.; Iaria, R.; Iwasawa, K.; Izzo, L.; Ji, L.; Feroci, M.; Ferdman, R. D.; Falanga, M.; Di Salvo, T.; Del Santo, M.; De Pasquale, M.; Dai, Z. G.; Constantin, E.; Chernyakova, M.; Chen, L.; Casella, P.; Rodríguez Gil, P.; Burderi, L.; National Natural Science Foundation of China (NSFC); European Research Council (ERC); National Aeronautics and Space Administration (NASA); Agencia Estatal de Investigación (AEI); Royal Society; Strategic Priority Research Program of the Chinese Academy of Sciences; European Research Council (ERC); National Science Centre, Poland (NCN); Unidad de Excelencia Científica María de Maeztu Instituto de Ciencias del Cosmos (ICCUB), MDM-2014-0369
In this White Paper we present the potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies related to Observatory Science targets. These include flaring stars, supernova remnants, accreting white dwarfs, low and high mass X-ray binaries, radio quiet and radio loud active galactic nuclei, tidal disruption events, and gamma-ray bursts. eXTP will be excellently suited to study one common aspect of these objects: their often transient nature. Developed by an international Consortium led by the Institute of High Energy Physics of the Chinese Academy of Science, the eXTP mission is expected to be launched in the mid 2020s.
Restringido
Vacuum tribological behaviour of self-lubricating quasicrystalline composite coatings
(Wiley, 2006-03-09) García de Blas, Javier; Román, A.; De Miguel, C.; Longo, Federico; Muelas Gamo, Raúl; Agüero, Alina
High-temperature-resistant self-lubricating coatings are needed in space vehicles for components that operate at high temperatures and/or under vacuum. Thick composite lubricant coatings containing quasicrystalline alloys as the hard phase for wear resistance can be deposited by a thermal spray technique. The coatings also contain lubricating materials (silver and BaF2CaF2 eutectic) and NiCr as the tough component. This paper describes the vacuum tribological properties of TH103, a coating of this type, with a very good microstructural quality. The coating was deposited by high-velocity oxygen fuel spraying and tested under vacuum using a pin-on-disc tribometer. Different loads, linear speeds, and pin materials were studied. The pin scars and disc wear tracks were characterised using a combination of scanning electron microscopy and energy dispersive spectrometry. A minimum mean steady friction coefficient of 0.32 was obtained when employing an X750 Ni superalloy pin in vacuum conditions under 10 N load and 15 cm/s linear speed, showing moderate wear of the disc and low wear of the pin.