Now showing items 1-18 of 18

    • Chemical and nanoindentation study of diffusion during sintering of 12Ce-ZrO2/3Y-ZrO2 powder layers 

      Roa Rovira, Joan Josep; Turón Viñas, Miquel; Tovar Vargas, Daniela; Ledesma, J.; Anglada Gomila, Marcos Juan (2018-02-01)
      Article
      Restricted access - publisher's policy
      Tetragonal zirconia polycrystals doped with 3% mol of yttria (3Y-ZrO2) exhibit excellent mechanical properties and biocompatibility. However, under humid environments, their surface structural integrity is degraded by aging ...
    • Chemical segregation in a 12Ce-ZrO2/3Y-ZrO2 ceramic composite 

      Roa Rovira, Joan Josep; Aboulfadl, Hisham; Barrirero, Jenifer; Turón Viñas, Miquel; Mücklich, Frank; Anglada Gomila, Marcos Juan (2017-10-01)
      Article
      Restricted access - publisher's policy
      In restorative dentistry, 3Y-ZrO2 ceramics are widely accepted for fabricating dental crowns, bridges and implants due to their good biocompatibility, excellent mechanical properties and high aesthetics potential. However, ...
    • Deformation mechanisms induced by nanoindentation tests on a metastable austenitic stainless steel: a FIB/SIM investigation 

      Sapezanskaia, Ina; Roa Rovira, Joan Josep; Fargas Ribas, Gemma; Turón Viñas, Miquel; Trifonov, T.; Kouitat Njiwa, R.; Redjaïmia, A.; Mateo García, Antonio Manuel (2017-09)
      Article
      Open Access
      Metastable austenitic stainless steels are materials that can undergo austenite to martensite phase transformation when subjected to deformation and thus they represent a multiphase material with interesting mechanical ...
    • Effect of calcia co-doping on ceria-stabilized zirconia 

      Turón Viñas, Miquel; Zhang, Fei; Vleugels, Jozef; Anglada Gomila, Marcos Juan (Elsevier, 2018-01-01)
      Article
      Open Access
      © 2018 Elsevier Ltd. Ceria-stabilized zirconia ceramics are characterised by excellent hydrothermal stability and high fracture toughness, but the fracture strength and hardness are lower than that of conventional 3Y-TZP, ...
    • Evaluation of damage in front of starting notches induced by ultra-short pulsed laser ablation for the determination of fracture toughness in zirconia 

      Turón Viñas, Miquel; Morillas, José; Moreno, Pablo; Anglada Gomila, Marcos Juan (Elsevier, 2017-12-01)
      Article
      Open Access
      Machining a very sharp notch on the surface of ceramics for fracture toughness testing has been a critical issue during many years. In this work, we explore a novel method capable of inducing sharp features with negligible ...
    • FIB tomography of WC-Co composites 

      Turón Viñas, Miquel (Universitat Politècnica de Catalunya, 2012-09)
      Master thesis
      Restricted access - author's decision
      The development of new methods of materials inspection allows a visualization and characterization of materials, increasingly accurate. So far, observation, characterization and study of materials were carried out using ...
    • Focused ion beam tomography of WC-Co cemented carbides 

      Jiménez Piqué, Emilio; Turón Viñas, Miquel; Chen, H.; Todorov Trifonov, Trifon; Fair, Jonathan; Tarrés, E.; Llanes, Angels (2017-09-01)
      Article
      Open Access
      The microstructure of three different grades of WC-Co cemented carbides (hardmetals) has been reconstructed in three dimensions after sequential images obtained by focused ion beam. The three dimensional microstructual ...
    • Fracture and fatigue behavior of cement carbides:3D focused ion beam tomography of crack-microstructure interactions 

      Tarragó Cifre, Jose María; Jiménez Piqué, Emilio; Turón Viñas, Miquel; Rivero, Lorenzo; Al-Dawery, Ihsan; Schneider, Ludwig; Llanes Pitarch, Luis Miguel (2014-09-01)
      Article
      Open Access
      The fracture and fatigue phenomena in WC-cobalt cemented carbides (hard-metals) have been subjects extensively investigated in the last 30 years. From these studies, it is well established that the metallic binder phase ...
    • Fracture toughness of zirconia from a shallow notch produced by ultra-short pulsed laser ablation 

      Turón Viñas, Miquel; Anglada Gomila, Marcos Juan (Elsevier, 2014-07-01)
      Article
      Restricted access - publisher's policy
      Ceria partially stabilized zirconia ceramics (Ce-TZP) with identical grain size and different amounts of transformation toughening were processed to investigate the influence of phase transformation on static and cyclic ...
    • Grietas pequeñas y resistencia a la rotura de materiales cerámicos tenaces 

      Turón Viñas, Miquel; Roa Rovira, Joan Josep; Anglada Gomila, Marcos Juan (2017)
      Conference lecture
      Restricted access - publisher's policy
      La 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 ...
    • Mechanical properties of 12Ce-ZrO2/3Y-ZrO2 composites 

      Turón Viñas, Miquel; Roa Rovira, Joan Josep; García Marro, Fernando; Anglada Gomila, Marcos Juan (2015-12-01)
      Article
      Open Access
      12Ce-ZrO2/3Y-ZrO2 composites with different compositions have been prepared by presureless sintering at 1450 degrees C and the resulting microstructures have been correlated with their mechanical properties in terms of ...
    • Mechanical properties of co-doped zirconia ceramics 

      Turón Viñas, Miquel (Universitat Politècnica de Catalunya, 2018-01-11)
      Doctoral thesis
      Open Access
      Tetragonal polycrystalline zirconia, commonly stabilised with 3 mol% yttria (3Y-TZP), became one of the most interesting ceramics for biomedical applications due to its biocompatibility and high mechanical properties. Among ...
    • Strength and fracture toughness of zirconia dental ceramics 

      Turón Viñas, Miquel; Anglada Gomila, Marcos Juan (2018-03-01)
      Article
      Restricted access - publisher's policy
      Objective The aim of the paper is to determine and discuss the correlation between the fracture toughness and the fracture stress in zirconia transforming ceramics with a small artificial crack. As an R-curve behaviour ...
    • Surface grain size and texture after annealing ground zirconia 

      Roa Rovira, Joan Josep; Turón Viñas, Miquel; Anglada Gomila, Marcos Juan (Elsevier, 2016)
      Article
      Open Access
      The surface microstructure induced after grinding and annealing 3 mol% Y2O3 stabilized tetragonal zirconia was investigated in a range of annealing temperatures between 1200 and 1600 °C. For annealing temperatures close ...
    • Surface microstructural changes of spark plasma sintered zirconia after grinding and annealing 

      Melk, Latifa; Mouzon, Johanne; Turón Viñas, Miquel; Akhtar, Farid; Antti, Marta-lena; Anglada Gomila, Marcos Juan (2016-11-01)
      Article
      Open Access
      Spark plasma sintered zirconia (3Y-TZP) specimens have been produced of 140 nm 372 nm and 753 nm grain sizes by sintering at 1250 °C, 1450 °C and 1600 °C, respectively. The sintered zirconia specimens were grinded using a ...
    • The influence of unshielded small cracks in the fracture toughness of yttria and of ceria stabilised zirconia 

      Melk, Latifa; Turón Viñas, Miquel; Roa Rovira, Joan Josep; Antti, Marta-Lena; Anglada Gomila, Marcos Juan (Elsevier, 2016-01-01)
      Article
      Restricted access - publisher's policy
      The fracture toughness, Ric of two 3Y-ZrO2 with different grain size (177 and 330 nm) and 12Ce-ZrO2 were determined from a sharp micro-machined notch by Ultra-Short Pulsed Laser Ablation (UPLA) where a micro-cracked zone ...
    • Toughening and fatigue micromechanisms in hardmetals: FESEM/FIB tomography characterization 

      Tarragó, José María; Jiménez Piqué, Emilio; Turón Viñas, Miquel; Schneider, Ludvik; Llanes Pitarch, Luis Miguel (2013)
      Conference report
      Restricted access - publisher's policy
      The particular microstructure assemblage of hardmetals yields those materials an extraordinary combination of hardness and toughness. On the other hand, it is also known that these materials are prone to strength degradation ...
    • Toughening and fatigue micromechanisms in hardmetals: SEM/FIB tomography characterization 

      Tarragó Cifre, Jose María; Jiménez Piqué, Emilio; Turón Viñas, Miquel; Rivero, Lorenzo; Schneider, Ludwig; Llanes Pitarch, Luis Miguel (2013)
      Conference report
      Restricted access - publisher's policy
      The particular microstructure assemblage of hardmetals yields those materials an extraordinary combination of hardness and toughness. On the other hand, it is also known that these materials are prone to strength degradation ...