Search Results - "Roa, J.J."

A review of doped lanthanum gallates as electrolytes for intermediate temperature solid oxides fuel cells: From materials processing to electrical and thermo-mechanical properties by Morales, M., Roa, J.J., Tartaj, J., Segarra, M.

“…The present review is focused on SrO- and MgO-doped lanthanum gallates (LSGMs), specifically in those key aspects related to their implementation as…”
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Mechanical properties at the nanometer scale of GDC and YSZ used as electrolytes for solid oxide fuel cells by Morales, M., Roa, J.J., Capdevila, X.G., Segarra, M., Piñol, S.

“…The Young’s modulus ( E), hardness ( H) and fracture toughness ( K IC ) of various compositions of gadolinia doped-ceria (GDC, Gd x Ce 1− x O 2− x /2, 0.1 ⩽ x…”
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Hall-Petch strengthening of the constrained metallic binder in WC–Co cemented carbides: Experimental assessment by means of massive nanoindentation and statistical analysis by Roa, J.J., Jiménez-Piqué, E., Tarragó, J.M., Sandoval, D.A., Mateo, A., Fair, J., Llanes, L.

“…WC–Co cemented carbides are geometrically complex composites constituted for two interpenetrating networks of the constitutive ceramic and metal phases…”
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Nanosecond-laser patterning of 3Y-TZP: Damage and microstructural changes by Roitero, E., Lasserre, F., Roa, J.J., Anglada, M., Mücklich, F., Jiménez-Piqué, E.

“…[Display omitted] The aim of this study is to characterize in detail the microstructural changes and collateral damage induced by direct laser patterning on…”
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Evolution of microstructure and residual stresses in gradually ground/polished 3Y-TZP by Minguela, J., Slawik, S., Mücklich, F., Ginebra, M.P., Llanes, L., Mas-Moruno, C., Roa, J.J.

“…A comprehensive study of progressively ground/polished 3Y-TZP was performed with the aim of better understanding the mechanisms driving the microstructural…”
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The effects of bimodal grain size distributions on the work hardening behavior of a TRansformation-TWinning induced plasticity steel by Sabzi, H. Eskandari, Zarei Hanzaki, A., Abedi, H.R., Soltani, R., Mateo, A., Roa, J.J.

“…The effects of bimodal grain size distributions on the mechanical properties of a newly developed TRansformation-TWinning induced plasticity (TRIP/TWIP) steel…”
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Enhanced thermal stability and fracture toughness of TiAlN coatings by Cr, Nb and V-alloying by Chen, Y.H., Roa, J.J., Yu, C.H., Johansson-Jõesaar, M.P., Andersson, J.M., Anglada, M.J., Odén, M., Rogström, L.

“…The effect of metal alloying on mechanical properties including hardness and fracture toughness were investigated in three alloys, Ti~0.33Al0.50(Me)~0.17N…”
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Surface grain size and texture after annealing ground zirconia by Roa, J.J., Turon-Vinas, M., Anglada, M.

“…The surface microstructure induced after grinding and annealing 3mol% Y2O3 stabilized tetragonal zirconia was investigated in a range of annealing temperatures…”
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Contact damage and fracture micromechanisms of multilayered TiN/CrN coatings at micro- and nano-length scales by Roa, J.J., Jiménez-Piqué, E., Martínez, R., Ramírez, G., Tarragó, J.M., Rodríguez, R., Llanes, L.

“…In this study, systematic nanomechanical and micromechanical studies have been conducted in three multilayer TiN/CrN systems with different bilayer periods (8,…”
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Depth-sensing indentation applied to polymers: A comparison between standard methods of analysis in relation to the nature of the materials by Giró-Paloma, J., Roa, J.J., Díez-Pascual, A.M., Rayón, E., Flores, A., Martínez, M., Chimenos, J.M., Fernández, A.I.

“…[Display omitted] •H and E at nanometric scale.•Polymer materials.•Oliver and Pharr and Loubet methods. Mechanical data (hardness and elastic modulus) from…”
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Effect of the filler on the nanomechanical properties of polypropylene in contact with paraffinic phase change material by Giro-Paloma, J., Rayón, E., Roa, J.J., Martínez, M., Fernández, A.I.

“…[Display omitted] •The use of inorganic filler Mg(OH)2 in PP changes notably the mechanical properties.•PCM acts as a plasticizer softening the materials.•The…”
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Processing of graded anode-supported micro-tubular SOFCs based on samaria-doped ceria via gel-casting and spray-coating by Morales, M., Navarro, M.E., Capdevila, X.G., Roa, J.J., Segarra, M.

“…A simple gel-casting method was successfully combined with the spray-coating technique to manufacture graded anode-supported micro-tubular solid oxide fuel…”
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Mechanical properties at nanometric scale of alumina layers formed in sulphuric acid anodizing under burning conditions by Roa, J.J., Gastón-García, B., García-Lecina, E., Müller, C.

“…A mechanical study (hardness, H and Young's modulus, E) at nanometric scale of the distribution of mechanical properties across the surface of porous anodic…”
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Corrosion induced degradation of textured YBCO under operation in high humidity conditions by Roa, J.J., Jiménez-Piqué, E., Díaz, J., Morales, M., Calleja, A., Segarra, M.

“…The early stages of aggressive degradation at 85% of humidity for 24h of single crystals of YBa2Cu3O7−δ textured by Bridgman technique have been analyzed by…”
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Optimization of the ceramic ink used in Direct Ink Writing through rheological properties characterization of zirconia-based ceramic materials by Yarahmadi, M., Barcelona, P., Fargas, G., Xuriguera, E., Roa, J.J.

“…Understanding and optimization the rheological properties characterization of zirconia (ZrO2) based ceramics inks is critical for optimizing the production of…”
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Chemical etching optimization of 3D printed α-Al2O3 monoliths to enhance the catalytic applications by Radogna, C., Serrano, I., Fargas, G., Llorca, J., Roa, J.J.

“…Direct Ink Writing has been demonstrated to be a promising route to produce ceramic catalysts with complex geometries and enhanced catalytic performances. To…”
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Micromechanical properties of Yttria-doped zirconia ceramics manufactured by direct ink writing by Yarahmadi, M., Roa, J.J., Zhang, J., Cabezas, L., Ortiz-Membrado, L., Llanes, L., Fargas, G.

“…Yttria-doped zirconia ceramics have many applications in a wide range of industries mainly due to their excellent mechanical properties, corrosion resistance…”
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Optimization of the sintering thermal treatment and the ceramic ink used in direct ink writing of α-Al2O3: Characterization and catalytic application by Álvarez, F., Cifuentes, A., Serrano, I., Franco, L., Fargas, G., Fenollosa, F., Uceda, R., Llanes, L., Tardivat, C., Llorca, J., Roa, J.J.

“…Unlike other engineered ceramic products, alumina (Al2O3) displays interesting mechanical and physical properties, which makes it an ideal candidate for a wide…”
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Effect of shot peening on metastable austenitic stainless steels by Fargas, G., Roa, J.J., Mateo, A.

“…In this work, shot peening was performed in a metastable austenitic stainless steel EN 1.4318 (AISI 301LN) in order to evaluate its effect on austenite to…”
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Micromechanical mapping of polycrystalline cubic boron nitride composites by means of high-speed nanoindentation: Assessment of microstructural assemblage effects by Gordon, S., Besharatloo, H., Wheeler, J.M., Rodriguez-Suarez, T., Roa, J.J., Jiménez-Piqué, E., Llanes, L.

“…Polycrystalline cubic boron nitrides (PcBNs) are composites widely used as cutting tool materials due to their exceptional high hardness and wear resistance…”
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