Exploració per autor "Roa Rovira, Joan Josep"
Ara es mostren els items 71-90 de 185
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Geometrically necessary dislocations on plastic deformation of polycrystalline TRIP steel
Roa Rovira, Joan Josep; Suárez Vallejo, Sebastian; Guitar, Agustina; Fargas Ribas, Gemma; Mateo García, Antonio Manuel (Multidisciplinary Digital Publishing Institute (MDPI), 2019-06-01)
Article
Accés obertIn this study, the main deformation behavior in terms of geometrically necessary dislocations (GND) was investigated on a transformation induced plasticity (TRIP) stainless steel by using sharp indentation at nanometric ... -
Grietas pequeñas y resistencia a la rotura de materiales cerámicos tenaces
Turón Viñas, Miquel; Roa Rovira, Joan Josep; Anglada Gomila, Marcos Juan (2017)
Comunicació de congrés
Accés restringit per política de l'editorialLa tenacidad de fractura, KIc, de 3Y-ZrO2 con dos diferentes tamaños de grano (177 and 330 nm) y la de 12Ce-ZrO2 se han determinado por medio de un ensayo de flexión en cuatro puntos en probetas prismáticas con grietas ... -
Grinding-induced metallurgical alterations in the binder phase of WC-Co cemented carbides
Yang, Jing; Roa Rovira, Joan Josep; Schwind, Martin; Odén, Magnus; Johansonn Joesaar, M. P.; Llanes Pitarch, Luis Miguel (2017-12)
Article
Accés obertThe metallic binder phase dictates the toughening behavior of WC-Co cemented carbides (hardmetals), even though it occupies a relative small fraction of the composite. Studies on deformation and phase transformation of the ... -
Hall-Petch strengthening of the constrained metallic binder in WC-Co cemented carbides: Experimental assessment by means of massive nanoindentation and statistical analysis
Roa Rovira, Joan Josep; Jiménez Piqué, Emilio; Salla Tarragó, José María; Mateo García, Antonio Manuel; Sandoval, Daniela A.; Fair, Jonathan; Llanes Pitarch, Luis Miguel (2016-10-31)
Article
Accés obertWC–Co cemented carbides are geometrically complex composites constituted for two interpenetrating networks of the constitutive ceramic and metal phases. Accordingly, assessment of microstructural effects on the local ... -
Hardness and Young's modulus distributions in atmospheric plasma sprayed WC-Co coatings using nanoindentation
Rayón, Emilio; Bonache, V.; Salvador, M.D.; Roa Rovira, Joan Josep; Sánchez, E. (2011-05-25)
Article
Accés restringit per política de l'editorialA statistical indentation analysis of WC–Co coatings obtained by atmospheric plasma spray (APS) with two secondary plasma gases, H2 and He, was investigated using an instrumented indentation technique with the aim of ... -
Hardness of FRHC-Cu Determined by Statistical Analysis
Roa Rovira, Joan Josep; Martínez López, Mónica; Rayón Encinas, Emilio; Ferrer Cruselles, Núria; Espiell Álvarez, Ferran; Segarra Rubi, Merce (2014-02)
Article
Accés obertA statistical indentation method has been employed to study the hardness value of fire-refined high conductivity copper, using nanoindentation technique. The Joslin and Oliver approach was used with the aim to separate ... -
High-field paramagnetic Meissner effect up to 14 T in melt-textured YBa2Cu3O7-delta
Teixeira Dias, Fábio; Vieira, Valdemar das Neves; Wolff-Fabris, Frederik; Kampert, Erik; Paiva Gouvêa, Cristol de; Campos, A.P.C.; Archanjo, B.S.; Schaf, Jacob; Obradors Berenguer, Xavier; Puig, T.; Roa Rovira, Joan Josep; Sahoo, B.K. (2016-06-01)
Article
Accés obertWe have performed magnetization experiments in a melt-textured YBa2Cu3O7-delta(Y123) sample with Y2BaCuO5 (Y211) inclusions, under magnetic fields up to 14 T applied parallel or perpendicular to the ab plane. Magnetic ... -
Hybrid conducting alginate-based hydrogel for hydrogen peroxide detection from enzymatic oxidation of lactate
Babeli Aguilera, Ismael; Puiggalí Jou, Anna; Roa Rovira, Joan Josep; Ginebra Molins, Maria Pau; García Torres, José Manuel; Alemán Llansó, Carlos (Elsevier, 2021-12-15)
Article
Accés obert
Realitzat a/amb: Institut de Bioenginyeria de CatalunyaA conducting nanocomposite hydrogel is developed for the detection of L-lactate. The hydrogel is based on a mixture of alginate (Alg) and poly(3,4-ethylenedioxythiophene) (PEDOT), which is loaded with gold nanoparticles ... -
Hydrofluoric acid etching of dental zirconia. Part 1: etching mechanism and surface characterization
Flamant, Quentin; García Marro, Fernando; Roa Rovira, Joan Josep; Anglada Gomila, Marcos Juan (Elsevier, 2016-01-01)
Article
Accés obertRough surfaces have been shown to promote osseointegration, which is one of the keys for a successful dental implantation. Among the diverse treatments proposed to roughen zirconia, hydrofluoric acid (HF) etching appears ... -
Implementation of advanced characterization techniques for assessment of grinding effects on the surface integrity of WC-Co cemened carbides
Yang, Jing; Roa Rovira, Joan Josep; Schwind, Martin; Odén, Magnus; Johansson Joesaar, M.P; Esteve, Joan; Llanes Pitarch, Luis Miguel (2018)
Article
Accés obertGrinding is a key step on the manufacturing process of WC–Co cemented carbides (hardmetals). In this work, an investigation of grinding effects on the surface integrity of hardmetals is conducted. It is done by combining ... -
Implementation of advanced characterization techniques for assessment of grinding effects on the surface integrity of WC-Co cemented carbides
Yang, Jing; Roa Rovira, Joan Josep; Schwind, Martin; Odén, Magnus; Johansson-Jõesaar, M.P.; Esteve, Joan; Llanes Pitarch, Luis Miguel (2018-02-21)
Article
Accés restringit per política de l'editorialGrinding is a key step on the manufacturing process of WC–Co cemented carbides (hardmetals). In this work, an investigation of grinding effects on the surface integrity of hardmetals is conducted. It is done by combining ... -
Influence of cyclic thermal treatments on the oxidation behavior of Ti-6Al- 2Sn-4Zr-2Mo alloy
Fargas Ribas, Gemma; Roa Rovira, Joan Josep; Sefer, B.; Mateo García, Antonio Manuel (2018-11-01)
Article
Accés restringit per política de l'editorialTi-6Al-2Sn-4Zr-2Mo is one of the most common titanium alloys for aerospace industry. This alloy experiences oxidation phenomenon at elevated temperatures. In the present study, cyclic thermal treatments were performed in ... -
Influence of cyclic thermal treatments on the oxidation behavior of Ti-6Al-2Sn-4Zr-2Mo alloy
Fargas Ribas, Gemma; Roa Rovira, Joan Josep; Sefer, Birhan; Mateo García, Antonio Manuel (2018-11-01)
Article
Accés obertTi-6Al-2Sn-4Zr-2Mo is one of the most common titanium alloys for aerospace industry. This alloy experiences oxidation phenomenon at elevated temperatures. In the present study, cyclic thermal treatments were performed in ... -
Influence of different shaping and finishing processes on the surface integrity of WC-Co cemented carbides
Riu Perdrix, Guiomar; Slawik, Sebastian; Mücklich, Frank; Llanes Pitarch, Luis Miguel; Roa Rovira, Joan Josep (Multidisciplinary Digital Publishing Institute (MDPI), 2023-12-30)
Article
Accés obertInvestigation of four different surface-shaping and finishing sequences is carried out on the surface integrity of a WC-10Co hardmetal grade. The surface conditions include grinding, electrical discharge machining and ... -
Influence of grinding/polishing on the mechanical, phase stability and cell adhesion properties of yttria-stabilized zirconia
Minguela Díaz, Joaquim; Ginebra Molins, Maria Pau; Llanes Pitarch, Luis Miguel; Mas Moruno, Carlos; Roa Rovira, Joan Josep (Elsevier, 2020-09)
Article
Accés obertThe changes in mechanical properties, hydrothermal degradation and cell adhesion were studied in 3Y-TZP under two different superficial modification patterns (uni- and multidirectional) with a surface roughness ranging ... -
Influence of laser cutting on the fatigue limit of two high strenght steels
Mateo García, Antonio Manuel; Fargas Ribas, Gemma; Calvo Muñoz, Jessica; Roa Rovira, Joan Josep (2015-03-05)
Article
Accés obertLaser cutting is widely used in the metal industry, particularly when components of high strength steel sheets are produced. However, the roughness of cut edges produced by laser differs from that obtained by other methods, ... -
INFLUENCE OF LASER CUTTING ON THE FATIGUE LIMIT OF TWO HIGH STRENGTH STEELS
Mateo García, Antonio Manuel; Fargas Ribas, Gemma; Calvo Muñoz, Jessica; Roa Rovira, Joan Josep (2013)
Text en actes de congrés
Accés obertLaser cutting is widely used in the metal industry, particularly when components of high strength steels sheets are produced. On the other hand, the roughness of cut - edges produced by laser differs from that obt ained ... -
Influence of microstructural assemblage of the substrate on the adhesion strength of coated PcBN grades
Gordon Pozuelo, Sandra; Roa Rovira, Joan Josep; Rodríguez Suárez, Teresa; M'Saoubi, Rachid; Jiménez Piqué, Emilio; Franca, Luiz F.P.; Llanes Pitarch, Luis Miguel (2022-01-01)
Article
Accés restringit per política de l'editorialCoated polycrystalline cubic boron nitride (PcBN) tools are increasingly used for industrial applications with stringent requirements. However, information on the mechanical integrity of these systems is quite limited. ... -
Influence of microstructure and mechanical properties on the tribological behavior of reactive arc deposited Zr-Si-N coatings at room and high temperature
Yalamanchili, Kumar; Jiménez Piqué, Emilio; Pelcastre, L.; Roa Rovira, Joan Josep; Johansson Joesaar, M.P; Prakash, Bhanu; Ghafoor, N; Odén, Magnus (Elsevier, 2016-10-25)
Article
Accés obertVarying the Si-content in Zr-Si-N coatings from 0.2 to 6.3 at.% causes microstructural changes from columnar to nanocomposite structure and a hardness drop from 37 to 26 GPa. The softer nanocomposite also displays lower ... -
Influence of pre-existing martensite on the wear resistance of metastable austenitic stainless steels
Fargas Ribas, Gemma; Roa Rovira, Joan Josep; Mateo García, Antonio Manuel (2016)
Article
Accés obertThe effect of pre-existing martensite on the sliding wear behavior of a commercial metastable austenitic stainless steel was investigated. Two different steel conditions were considered: annealed (with a fully austenitic ...