Thermophysical Characterization of Lubricants Additivated with Nanoparticles for their Application in Renewable Energies

  1. García Guimarey, María Jesús
Dirixida por:
  1. Alfredo J. Amigo Pombo Director
  2. María José Pérez Comuñas Director

Universidade de defensa: Universidade de Santiago de Compostela

Fecha de defensa: 05 de xuño de 2019

Tribunal:
  1. Jose Luis Viesca Rodríguez Presidente/a
  2. Josefa Salgado Carballo Secretaria
  3. Ramiro Carneiro Martins Vogal
Departamento:
  1. Departamento de Física Aplicada

Tipo: Tese

Resumo

This PhD Thesis is focused on the analysis of thermophysical and tribological properties of synthetic and mineral base oils, commercial lubricants (gearbox and motor oils) and new formulated nanolubricants. Nanoparticles of different morphology (spherical, rod-like and laminar) were used as lubricant additives: zirconium oxide and boron nitride nanoparticles together with graphene nanoplatelets. In order to propose new potential lubricants it is of vital importance to analyse the effect that the addition of the nanoadditives has on their thermophysical properties, because they affect the final lubricants performance. With this aim, the volumetric and viscous behaviour, viscosity index, flow curves and thermal conductivity were experimentally obtained. In order to know the mechanisms that control the tribological performance it is also necessary to determine the pressure-viscosity coefficient for elastohydrodynamic lubrication, the film thickness, the wear and the friction coefficient.