dc.creator | Myers, Sterling | |
dc.creator | Jianliang, Lin | |
dc.creator | Souza, Roberto Martins de | |
dc.creator | Sproul, Willian D | |
dc.creator | Moore, John J | |
dc.date.accessioned | 2014-02-24T18:59:51Z | |
dc.date.accessioned | 2018-07-04T16:43:52Z | |
dc.date.available | 2014-02-24T18:59:51Z | |
dc.date.available | 2018-07-04T16:43:52Z | |
dc.date.created | 2014-02-24T18:59:51Z | |
dc.date.issued | 2014-02-24 | |
dc.identifier | http://www.producao.usp.br/handle/BDPI/44041 | |
dc.identifier | 10.1016/j.surfcoat.2012.10.061 | |
dc.identifier | http://www.sciencedirect.com/science/article/pii/S0257897212010341# | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1639587 | |
dc.description.abstract | Tantalum coatings are of particular interest today as promising candidates to replace potentially hazardous electrodeposited chromium coatings for tribological and corrosion resistant applications, such as the internal lining on large-caliber gun barrels. Tantalum coatings have two crystalline phases, α-Ta (body-centered-cubic) and β-Ta (metastable tetragonal) that exhibit relatively different properties. Alpha-Ta is typically preferred for wear and corrosion resistant applications and unfortunately, is very difficult to deposit without the assistance of substrate heating or post-annealing treatments. Furthermore, there is no general consensus on the mechanism which causes α or β to form or if there is a phase transition or transformation from β → α during coating deposition. In this study, modulated pulsed power (MPP) magnetron sputtering was used to deposit tantalum coatings with thicknesses between 2 and 20 μm without external substrate heating. The MPP Ta coatings showed good adhesion and low residual stress. This study shows there is an abrupt β → α phase transition when the coating is 5–7 μm thick and not a total phase transformation. Thermocouple measurements reveal substrate temperature increases as a function of deposition time until reaching a saturation temperature of ~ 388 °C. The importance of substrate temperature evolution on the β → α phase transition is also explained. | |
dc.language | eng | |
dc.publisher | Lausanne | |
dc.relation | Surface and Coatings Technology | |
dc.rights | http://creativecommons.org/licenses/by-nc-nd/3.0/br/ | |
dc.rights | Elsevier | |
dc.rights | restrictedAccess | |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Brazil | |
dc.subject | Modulated pulsed power (MPP) | |
dc.subject | magnetron sputtering | |
dc.subject | High power pulsed magnetron | |
dc.subject | sputtering (HPPMS) | |
dc.subject | Tantalum coatings | |
dc.subject | Phase transition | |
dc.subject | Thick coating | |
dc.title | The β to α phase transition of tantalum coatings deposited by modulated pulsed power magnetron sputtering | |
dc.type | Artículos de revistas | |