Search Results - "Nicholls, J.R"

Effect of stress state and simultaneous hot corrosion on the crack propagation and fatigue life of single crystal superalloy CMSX-4 by Brooking, L., Gray, S., Sumner, J., Nicholls, J.R., Marchant, G., Simms, N.J.

“…•A stress hot corrosion cracking mechanism was demonstrated in a superalloy.•The effect of stress state was studied through use of different…”
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Fireside corrosion degradation of HVOF thermal sprayed FeCrAl coating at 700–800°C by Hussain, T., Simms, N.J., Nicholls, J.R., Oakey, J.E.

“…To reduce the emissions of greenhouse gases, the power generation industry is increasingly moving towards higher operating steam temperatures (and pressures)…”
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Methods to reduce the thermal conductivity of EB-PVD TBCs by Nicholls, J.R., Lawson, K.J., Johnstone, A., Rickerby, D.S.

“…This paper reviews the advantages and disadvantages of various thermal barrier coating (TBC) systems, with the aim of custom designing a TBC system to be both…”
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Development of hot corrosion resistant coatings for gas turbines burning biomass and waste derived fuel gases by Bradshaw, A., Simms, N.J., Nicholls, J.R.

“…Carbon dioxide emission reductions are being sought worldwide to mitigate climate change. These need to proceed in parallel with optimisation of thermal…”
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Smart overlay coatings — concept and practice by Nicholls, J.R., Simms, N.J., Chan, W.Y., Evans, H.E.

“…Smart overlay coatings are a functionally gradient coating system designed to provide high temperature corrosion protection over a wide range of operating…”
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DLC–ceramic multilayers for automotive applications by Cruz, R., Rao, J., Rose, T., Lawson, K., Nicholls, J.R.

“…The present work explores the deposition of hard, wear resistant multilayer coatings, by magnetron sputtering onto Aluminium (Al) alloy substrates that are…”
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A New Reactive Atom Plasma Technology (RAPT) for Precision Machining: the Etching of ULE® Surfaces by Fanara, C., Shore, P., Nicholls, J.R., Lyford, N., Kelley, J., Carr, J., Sommer, P.

“…Results on reactive atom plasma etching performed on ULE® (Corning Ultra Low Expansion) glass samples at atmospheric pressure are presented for the first time…”
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Passage of trace metal contaminants through hot gas paths of gas turbines burning biomass and waste-fuels by Bradshaw, A., Simms, N.J., Nicholls, J.R.

“…Integrated gasification combined-cycles (IGCC) are the basis for high efficiency power generation units. IGCC systems lend themselves to gasification of…”
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Nano and Micro indentation studies of bulk zirconia and EB PVD TBCs by 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…”
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The effect of TBC morphology and aging on the erosion rate of EB-PVD TBCs by Wellman, R.G., Deakin, M.J., Nicholls, J.R.

“…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…”
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Phase stability and thermal insulation of YSZ and erbia-yttria co-doped zirconia EB-PVD thermal barrier coating systems by Boissonnet, G., Chalk, C., Nicholls, J.R., Bonnet, G., Pedraza, F.

“…In order to cope with the ever-increasing operating temperature of aero gas turbines, new thermal barrier coatings are being investigated. Among the different…”
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Sickle Cell-Related Fat Embolism Syndrome and the Need for Therapeutic Plasma Exchange by Nicholls, J.R., Leonard, A., Garcia, M., Sadasivam, N., Charlesworth, M.

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Analysis of combined static load and low temperature hot corrosion induced cracking in CMSX-4 at 550°C by Brooking, L., Gray, S., Dawson, K., Nicholls, J.R., Simms, N.J., Sumner, J., Tatlock, G.J.

“…•Crack propagation occurs due to localised corrosion enhanced de-cohesion.•Cracks preferentially propagate through the gamma′ precipitates.•Corrosion species…”
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CMAS corrosion of EB PVD TBCs: Identifying the minimum level to initiate damage by Wellman, R., Whitman, G., Nicholls, J.R.

“…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…”
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CMAS degradation of EB-PVD TBCs: The effect of basicity by Craig, M., Ndamka, N.L., Wellman, R.G., Nicholls, J.R.

“…Turbine entry temperatures of aerospace gas turbine engines will need to increase in future engine designs due to a constant desire to improve fuel efficiency…”
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The effect of trepanning speed of laser drilled acute angled cooling holes on the high temperature low cycle corrosion fatigue performance of CMSX-4 at 850°C by Morar, N., Roy, R., Mehnen, J., Nicholls, J.R., Gray, S.

“…•The corrosion environment alone caused a 10% reduction in life at 850°C.•Laser drilled cooling holes reduced the fatigue life by 35–50% at 850°C.•Higher…”
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Fireside Corrosion Behavior of HVOF and Plasma-Sprayed Coatings in Advanced Coal/Biomass Co-Fired Power Plants by Hussain, T., Dudziak, T., Simms, N. J., Nicholls, J. R.

“…This article presents a systematic evaluation of coatings for advanced fossil fuel plants and addresses fireside corrosion in coal/biomass-derived flue gases…”
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Interaction of hot corrosion fatigue and load dwell periods on a nickel-base single crystal superalloy by Brooking, L., Gray, S., Sumner, J., Nicholls, J.R., Simms, N.J.

“…•Type II hot corrosion reduces fatigue life in superalloys.•Further reductions in fatigue life were observed with extended dwell periods.•Fracture features…”
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Failure mechanism of an out-of-pack nickel aluminide coating cyclically oxidised at 1100°C with water accelerated cooling by Brossard, M., Pedraza, F., Craig, M., Nicholls, J.R.

“…The failure mechanism of a nickel aluminide coating cyclically oxidised for 1h-cycles at 1100°C and cooled by liquid water is described using a cyclic…”
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Effects of cyclic stress and temperature on oxidation damage of a nickel-based superalloy by Karabela, A., Zhao, L.G., Tong, J., Simms, N.J., Nicholls, J.R., Hardy, M.C.

“…► FIB shows the formation of surface oxide scales and internal micro-voids. ► Oxidation damage at 800 °C is much more severe than that at 700 °C and 750 °C. ►…”
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