Blar i NTNU Open på forfatter "Espallargas, Nuria"
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Hydraulic Fluids for Offshore Applications – the Lubrication Mechanisms of Water-Based Fluids
Bernat, Szymon Czesław (Doctoral theses at NTNU;2018:268, Doctoral thesis, 2018)Components used in offshore drilling applications such as hydraulic cylinders wear out earlier than expected due to the combined effect of multidegradation processes like friction, wear, mechanical stresses and corrosion. ... -
An in-situ electrochemical nanoindentation (ECNI) study on the effect of hydrogen on the mechanical properties of 316L austenitic stainless steel
Basa, Adina; Wang, Dong; Espallargas, Nuria; Wan, Di (Peer reviewed; Journal article, 2021)In-situ electrochemical nanoindentation (ECNI) has been used to study the effect of hydrogen on the mechanical properties of austenitic stainless steel AISI 316L. Changing the electrode potential (via electrochemical ... -
In-situ Generated Tribomaterial in Metal/Metal Contacts: Current understanding and future implications for implants
Espallargas, Nuria; Fischer, Alfons; Igual-Munoz, Anna; Mischler, Stefano; Wimmer, Markus (Journal article; Peer reviewed, 2017)Artificial hip joints operate in aqueous biofluids that are highly reactive towards metallic surfaces. The reactivity at the metal interface is enhanced by mechanical interaction due to friction, which can change the ... -
Investigation of Multi-degradation Mechanisms in Different Stainless Steels in Direct Riser Tensioning Systems for Offshore Oil&Gas Industry
Andrzejewski, Maciej Wladyslaw (Master thesis, 2015)Many components utilized in offshore industry are complex tribological systems, for instance Direct Riser Tensioner (DRT) cylinders which include the use of seals, guide bands, hydraulic fluids/lubricants and materials in ... -
Ionic liquid additives in water-based lubricants for bearing steel – effect of electrical conductivity and pH on surface chemistry, friction and wear
Wijanarko, Wahyu; Khanmohammadi, Hamid; Espallargas, Nuria (Journal article; Peer reviewed, 2022) -
Ionic Liquids as Additives in Water‑Based Lubricants: From Surface Adsorption to Tribofilm Formation
Khanmohammadi, Hamid; Wijanarko, Wahyu; Espallargas, Nuria (Peer reviewed; Journal article, 2020)Ionic liquids (ILs) are potential lubricant additives that can potentially perform simultaneously as friction modifiers and anti-wear agents. In addition, they possess good thermal stability, they are non-flammable, they ... -
Ionic liquids as boundary additives in water-based and PAO lubricants
Wijanarko, Wahyu; Khanmohammadi, Hamid; Espallargas, Nuria (Peer reviewed; Journal article, 2021)Ionic liquids have been widely discussed as potential lubricants, however, their properties make them also very good potential candidates as lubricant additives (e.g., friction modifiers and anti-wear). In this work, the ... -
Korrosjon og Tribologi Effekter på Belegg for Uttrekkbare Baug Foiler for Skip
Fidje, Connie Iren Senland (Master thesis, 2019)Hydrofoiler har lenge blitt brukt på mindre båter. Men som følge av forskjellige utfordringer, har det ikke til nå vært mulig å bruke foiler på større farttøy. Wavefoil er et firma som har utviklet en uttrekkbar foliemodul ... -
Mechanical Properties of Elastomers at Low Temperatures for Sealing Applications
Vestre, Andreas (Master thesis, 2015)With increased oil and gas activity in low-temperature areas of the world, it is highly important that the industry utilize the most robust materials and zero-leakage solutions. The O ring is a type of elastomer sealer ... -
Mechanical Properties of Elastomers at Low Temperatures for Sealing Applications
Vestre, Andreas (Master thesis, 2015)With increased oil and gas activity in low-temperature areas of the world, it is highly important that the industry utilize the most robust materials and zero-leakage solutions. The O ring is a type of elastomer sealer ... -
Nano ski wax, effects and benefits
Haaland, Nora Holst (Master thesis, 2013)The effects of the gliding properties of ski waxes are often discussed and many speculations and assumptions are made. However there are not many studies and documented results in this field. This project is carried out ... -
Production and Characterization of a Zr-based Bulk Metallic Glass: The possibility of a future biomaterial
Hansen, Marius (Master thesis, 2013)Materials put under strain while exposed to the harsh environment of the human body, must not only be chemically stable, but also have good tribocorrosion properties, i.e. a combination of good corrosion and wear properties.In ... -
Rubber contact mechanics: adhesion, friction and leakage of seals
Tiwari, Avinash; Dorogin, Leonid; Tahir, M; Stöckelhuber, Klaus Werner; Heinrich, Gert; Espallargas, Nuria; Persson, B. N. J (Journal article; Peer reviewed, 2017)We study the adhesion, friction and leak rate of seals for four different elastomers: Acrylonitrile Butadiene Rubber (NBR), Ethylene Propylene Diene (EPDM), Polyepichlorohydrin (GECO) and Polydimethylsiloxane (PDMS). ... -
Rubber friction: The contribution from the area of real contact
Tiwari, Avinash; Miyashita, N; Espallargas, Nuria; Persson, Bo N.J. (Journal article; Peer reviewed, 2018)There are two contributions to the friction force when a rubber block is sliding on a hard and rough substrate surface, namely, a contribution Fad = τf A from the area of real contact A and a viscoelastic contribution Fvisc ... -
SiC-YAG coating microstructure optimization trough powder feedstock manufacturing process control
Perelló Badía, Daniel (Master thesis, 2021)Abstract will be available on 2024-07-26 -
Synthesis of Metal Coated SiC Particles for Thermal Spray Feedstock Powder
Carlsen, Håkon Eig (Master thesis, 2021)Abstract will be available on 2024-02-05 -
Synthesis of SiC-Metal Feedstock Powder for Thermal Spray
Gniazdowska, Ewa (Master thesis, 2019)Bruk av SiC som råmateriale for termisk sprøyting har vært av stor interesse for industrien i mange år. En grunn til dette er de eksepsjonelle kjemiske, fysiske og mekaniske egenskaper av SiC. En annen grunn er pris og ... -
Testing og modifisering av en kjemisk reaktorprototype fra laboratorium til pilot
Bratlie, Henrik Rotvær; Heimvik, Sondre Mosnes (Bachelor thesis, 2021)Sammendraget er konfidensielt. -
The effect of friction modifiers on tribocorrosion and tribocorrosion-fatigue of austenitic stainless steel
Hossein Zavieh, Amin; Espallargas, Nuria (Journal article; Peer reviewed, 2017)Hydraulic fluids are vastly operated in marine applications however existing mineral-based fluids are not an alternative in these applications due to both security reasons during operation (fire hazard) and the effect for ... -
The Role of Oxide Tribofilms on Friction and Wear of Different Thermally Sprayed WC-CoCr
Wesmann, Johan Andre; Kuroda, Seiji; Espallargas, Nuria (Journal article; Peer reviewed, 2017)The tribolgical response of five different thermal sprayed WC-CoCr coatings sprayed with HVOF (JP-5000), HVAF (UniqueCoat M3) and Warm Spray (NIMS, Japan) has been evaluated during dry sliding in air and in nitrogen gas. ...