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Browsing by Author "Nicholls, John R."

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Analysis of combined static load and low temperature hot corrosion induced cracking in CMSX-4 at 550°C

Brooking, Laurie; Gray, Simon; Dawson, K.; Nicholls, John R.; Simms, Nigel J.; Sumner, Joy; Tatlock, G. J. (Elsevier, 2019-10-18)

A CMSX-4 3-point bend specimen was statically loaded under hot corrosion conditions and SEM, (S)TEM and EDX techniques were used to analyse the cracking generated. Sulphur, chlorine, sodium and oxygen were found at the ...
Analysis of high temperature steam oxidation of superheater steels used in coal fired boilers

Dudziak, T.; Lukaszewicz, Mikolaj; Simms, Nigel J.; Nicholls, John R. (Springer, 2015-10-30)

The present work compares the behaviour of four steels: (T23, T92, T347HFG, Super304H) in the temperature range 600–750 °C. This study focuses on the analysis of the oxidation kinetics in terms of mass change, metal loss ...
Bioinspired metal–polymer thin films with varying hydrophobic properties

Rao, Jeff; Anjum, Sadaf Saad; Craig, M.; Nicholls, John R. (Springer, 2017-08-14)

Nanocomposites involve the inclusion of one material into the layers of another material at a nanoscale level. Inspired by nature, nanocomposites material systems offer functionalities over their bulk forms which in some ...
Carbon and titanium diboride (TiB2) multilayer coatings.

Rao, Jeff; Cruz, R.; Lawson, K. J.; Nicholls, John R. (2004-11-01)

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 industry. The unique ...
Carbon Brainprint Case Study: ceramic coatings for jet engine turbine blades

Parsons, David J.; Chatterton, Julia C.; Nicholls, John R. (2011-07-31)

Ceramic thermal barrier coatings (TBCs) are applied to jet turbine blades to protect them from the high temperature gases leaving the combustion chamber and to increase the efficiency of the engine. Professor John Nicholls ...
Carbon brainprint – An estimate of the intellectual contribution of research institutions to reducing greenhouse gas emissions

Chatteron, Julia C.; Parsons, David J.; Nicholls, John R.; Longhurst, Philip J.; Bernon, Mike; Palmer, Andrew; Brennan, Feargal P.; Kolios, Athanasios; Wilson, Ian; Ishiyama, Edward; Clements-Croome, Derek; Elmualim, Abbas; Darby, Howard; Yearly, Tom; Davies, Gareth J. (Elsevier, 2015-05-07)

Research and innovation have considerable, currently unquantified potential to reduce greenhouse gas emissions by, for example, increasing energy efficiency. Furthermore, the process of knowledge transfer in itself can ...
CMAS corrosion of EB PVD TBCs: Identifying the minimum level to initiate damage

Wellman, R. G.; Whitman, G.; Nicholls, John 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, ...
Corrosion fatigue testing: the combined effect of stress and high temperature corrosion

Chapman, Neil; Brooking, Laurie; Sumner, Joy; Gray, Simon; Nicholls, John R. (Taylor & Francis, 2017-10-20)

A corrosive environment can have a detrimental effect on the fatigue life of a material due to a change in failure mechanism. Attempts have been made to replicate this change on nickel-base superalloy CMSX-4 cast in the ...
Effect of microstructure and temperature on the erosion rates and mechanisms of modified EB PVD TBCs

Wellman, R. G.; Nicholls, John 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, ...
Effect of plasma processing parameters on the surface modification of fibre reinforced composites by atmospheric pressure plasma treatment

Frumosu, Lydia; Bishop, Alex; Castelli, Marco; Bennett, Adam; Nicholls, John R.; Huang, Zhaorong (euspen, 2021-06-10)

This report presents a study on the effect of microwave plasma sources on the surface modification of carbon fibre reinforced composites. The adhesion property of polymer composites is an important consideration in ...
Effect of stress state and simultaneous hot corrosion on the crack propagation and fatigue life of single crystal superalloy CMSX-4

Brooking, Laurie; Gray, Simon; Sumner, Joy; Nicholls, John R.; Marchant, G.; Simms, Nigel J. (Elsevier, 2018-05-03)

Operating conditions within industrial gas turbines are changing in response to pressures to reduce environmental impact and enable use of renewable sources. This is driving an increase in the operational temperatures and ...
The effect of TBC morphology on the erosion rate of EB PVD TBCs

Wellman, Richard G.; Deakin, M. J.; Nicholls, John R. (Elsevier Science B.V., Amsterdam., 2005-01-31)

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 failure of the bond coat and the ...
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

Morar, Nicolau; Roy, Rajkumar; Mehnen, Jorn; Nicholls, John R.; Gray, Simon (Elsevier, 2017-05-04)

The effect of laser trepanning speed and, as a result, recast layer thickness on the high temperature corrosion fatigue behaviour of CMSX-4 superalloy acute angled holes was investigated. The experimental test results show ...
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

Morar, N.; Roy, Rajkumar; Mehnen, Jorn; Nicholls, John R.; Gray, Simon (Elsevier, 2017-05-04)

The effect of laser trepanning speed and, as a result, recast layer thickness on the high temperature corrosion fatigue behaviour of CMSX-4 superalloy acute angled holes was investigated. The experimental test results show ...
Effects of oxidation and hot corrosion in a nickel disc alloy

Encinas-Oropesa, Adriana; Drew, G. L.; Hardy, M. C.; Leggett, A. J.; Nicholls, John R.; Simms, Nigel J. (2008-12-31)

This paper describes work to study oxidation and hot corrosion damage in nickel disc alloy RR1000. Oxidation damage has been characterised via mass change data from thermogravimetric analyses at temperatures from 700 to ...
Electrodeposition of aluminium film on P90 Li-Al alloy as protective coating against corrosion

Bardi, U.; Caporali, S.; Craig, M.; Giorgetti, A.; Perissi, I.; Nicholls, John R. (Elsevier Science B.V., Amsterdam., 2009-02-28)

In this paper we report on the electrodeposition of thin aluminium layers on P90 lithium–aluminium alloy at room temperature from a chloroaluminate ionic liquid (1-butyl-3-methyl imidazolium heptachloroaluminate ...
Erosion and high temperature oxidation resistance of new coatings fabricated by a sol-gel route for a TBC application.

Viazzi, Céline; Wellman, R. G.; Oquab, Djar; Nicholls, John 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 ...
Erosion of gadolinia doped EB-PVD TBCs

Steenbakker, R J L; Wellman, R. G.; Nicholls, John 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 ...
Erosion, corrosion and erosion-corrosion of EB PVD thermal barrier coatings

Wellman, R. G.; Nicholls, John 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 ...
Evolution of stress and morphology in thermal barrier coatings

Wang, Xin; Atkinson, Alan; Chirivi, Laura; Nicholls, John R. (Elsevier Science B.V., Amsterdam., 2010-08-25)

Residual stress in the thermally grown oxide (TGO) in thermal barrier coatings (TBCs) was measured by photoluminescence piezospectroscopy (PLPS) and stress maps created to track local stress changes as a function of ...

Browsing by Author "Nicholls, John R."

Browsing by Author "Nicholls, John R."

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