Browsing by Author "Wellman, R. G."

Browsing by Author "Wellman, R. G."

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  • Wellman, R. G.; Whitman, G.; Nicholls, J. R. (2010-01-01)
    Over the last decade a significant amount of research has been conducted into the durability of thermal barrier coatings (TBCs) focusing mainly on issues of oxidation, erosion and foreign object damage (FOD). However, ...
  • Wellman, R. G.; Nicholls, J. R.; Murphy, K. S. (Elsevier Science B.V., Amsterdam., 2009-10-29)
    Thermal barrier coatings (TBCs) have now been used in gas turbine engines for a number of decades and are now considered to be an accepted technology. As there is a constant drive to increase the turbine entry temperature, ...
  • Viazzi, Céline; Wellman, R. G.; Oquab, Djar; Nicholls, J. R.; Monceau, Daniel; Bonino, Jean-Pierre; Florence, Ansart (Trans Tech Publications, 2008)
    This paper examines the erosion and cyclic oxidation performance of novel thermal barrier coatings produced via the sol-gel route. The ceramic top coat, with a thickness of 5- 25µm, was deposited via a sol-gel route onto ...
  • Steenbakker, R J L; Wellman, R. G.; Nicholls, J. R. (Elsevier Science B.V., Amsterdam., 2006-12-01)
    Gadolinia additions have been shown to significantly reduce the thermal conductivity of EB-PVD TBCs. The aim of this paper is to further the understanding on the effects of dopants on the erosion resistance of EB-PVD ...
  • Wellman, R. G.; Nicholls, J. R. (Elsevier Science B.V., Amsterdam., 2008-07-01)
    Electron beam (EB) physical vapour deposited (PVD) thermal barrier coatings (TBCs) have been used in gas turbine engines for a number of years. The primary mode of failure is attributed to oxidation of the bond coat and ...
  • Wellman, R. G.; Nicholls, J. R. (Elsevier Science B.V., Amsterdam., 2004-05-01)
    The aim of this paper is to provide an overview of erosion-oxidation studies by reviewing the work that has been done on mechanisms, maps and models. High temperature erosionoxidation is a major cause of wear in both ...
  • Wellman, R. G.; Nicholls, J. R. (Trans Tech Publications, Switzerland., 2000-07-10)
    Since the introduction of electron beam (EB) physical vapour deposition (PVD) TBCs and their application to moving components in the hot gas stream, erosion has become a prime concern. This project has been involved in ...
  • Wellman, R. G.; Nicholls, J. R. (Elsevier Science B.V., Amsterdam., 2004-05-01)
    Since the introduction of electron beam (EB) physical vapour deposition (PVD) thermal barrier coatings (TBCs) and their application to moving components in the hot gas stream, erosion has become a prime concern. EB PVD ...
  • Tryon, B.; Feng, Q.; Wellman, R. G.; Murphy, K. S.; Yang, J.; Levi, C.G.; Nicholls, J. R.; Pollock, T. M. (Springer Verlag, 2006-11)
    Diffusional approaches for fabrication of multi-layered Ru-modified bond coats for thermal barrier coatings have been developed via low activity chemical vapor deposition and high activity pack aluminization. Both processes ...
  • Wellman, R. G.; Dyer, A.; Nicholls, J. R. (Elsevier Science B.V., Amsterdam., 2004-01-01)
    In order to model the erosion of a material it is necessary to know the material properties of both the impacting particles as well as the target. In the case of electron beam (EB) physical vapour deposited(PVD) thermal ...
  • Wellman, R. G.; Tourmente, H.; Impey, S. A.; Nicholls, J. R. (Elsevier Science B.V., Amsterdam., 2004-11-01)
    Previous studies on the erosion of electron beam physical vapour deposited thermal barrier coatings (EB PVD TBCs) has shown that aging the coatings at between 1100 and 1500 à °C before erosion increases the erosion rate. ...
  • Wellman, R. G.; Nicholls, J. R. (Elsevier Science B.V., Amsterdam., 2004-01-30)
    Thermal barrier coatings have been used in gas turbine engines for some four decades, and the erosion resistance of these coatings has been well documented over the years by various different groups. However, as far as ...
  • Wellman, R. G.; Scrivani, A.; Rizzi, G.; Weisenburger, A.; Tenailleau, F H; Nicholls, J. R. (Elsevier Science B.V., Amsterdam., 2007-12-01)
    This paper discusses the effect of pulsed electron beam (PEB) treatment of thermal sprayed MCrAlY bondcoats on the cyclic life of thermal barrier coatings (TBCs). Standard MCrAlY bondcoats were produced via HVOF, VPS and ...
  • Wellman, R. G.; Nicholls, J. R. (Iop Publishing Ltd, 2007-08-21)
    The application of thermal barrier coatings (TBCs) to components with internal cooling in the hot gas stream of gas turbine engines has facilitated a steep increase in the turbine entry temperature and the associated ...
  • Wellman, R. G.; Nicholls, J. R. (Elsevier Science B.V., Amsterdam., 2000-07-10)
    Following the successful application of electron beam (EB) physical vapour deposition (PVD) thermal barrier coatings (TBCs) to moving parts of turbine engines, the erosion resistance of these coatings has been of interest ...