Wellman, R. G., Scrivani, A., Rizzi, G., Weisenburger, A., Tenailleau, F. H., Nicholls, J. R.
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...
A Review of the Erosion of Thermal Barrier Coatings. (2007)
Wellman, R. G., Nicholls, J. R.
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...
Erosion and Foreign Object Damage of Thermal Barrier Coatings (2006)
Nicholls, J. R., Wellman, R. G.
Thermal barrier coating are perceived as an enabling technology to increase the performance of, improve efficiency within, and lower the emissions from modern gas turbines. To fully utilize this...
Fanara, C., Shore, P., Nicholls, J. R., Lyford, N., Kelley, J., Carr, J., ...
Results on reactive atom plasma etching performed on ULE® (Corning Ultra Low Expansion) glass samples at atmospheric pressure are presented for the first time. A reactive atomic plasma technology...
The effect of TBC morphology on the erosion rate of EB-PVD TBC's (2005)
Wellman, R. G., Nicholls, J. R., Deakin, M. J.
Abstract Since thermal barrier coatings (TBCs) have been used in gas turbines most of the research conducted on them has involved the bond coat and the growth of the thermally grown oxide (TGO) as...
Carbon and titanium diboride (TiB2) multilayer coatings. (2004)
Rao, J., Cruz, R., Lawson, K. J., Nicholls, J. R.
Titanium Diboride, (TiB2) is a metal-based refractory ceramic material that has been investigated in industrial applications ranging from, cutting tools to wear parts and for use in the aerospace...
High Temperature Erosion-Oxidation Mechanisms, Maps and Models (2004)
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...
On the Effect of Ageing on the Erosion of EB-PVD TBCs (2004)
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....
Nano and Micro indentation studies of bulk zirconia and EB PVD TBCs (2004)
Wellman, R.G., Dyer, A., Nicholls, J.R.
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...
The development of carbon-based sensors for the measurement of atomic oxygen (2003)
White, C.B., Rao, J., Roberts, G.T., Chambers, A.R., Lawson, K.J., Nicholls, J.R.
This paper describes preliminary results of atomic oxygen (AO) exposures on a variety of carbon-based films and assesses their suitability for sensing atomic oxygen in low Earth orbit (LEO), by means...
A Mechanism for the Erosion of EB PVD TBCS (2000)
Wellman, R. G., Nicholls, J. R.
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...
In Situ Measurements of the Mechanical Properties of Aluminide Coatings. (1998)
Hancock, P., Chen, H. H., Nicholls, J. R., Stephenson, D. J.
A novel technique was used to measure the mechanical properties of surface diffusion coatings which, unlike overlay coatings, cannot be evaluated from bulk samples; coatings on thin foil samples over...
Applications of Coating Technology and HIP to Advanced Materials Processing. (1998)
Nicholls, J. R., Stephenson, D. J.
A review is presented on the interaction between coating technology and hot isostatic pressing (HIP) in the design and manufacture of new materials. Methods of encapsulating and HIP powders using...
Only a waif [poem] Washington, D. C., 1891. (1891)
At head of p. [1]: On reading the report of the "Newsboys" and Children's Aid Society."