Engineering applications of Bragg-edge neutron transmission

Santisteban, J.R.; Edwards, L.; Fizpatrick, M.E.; Steuwer, A.; Withers, Philip J.

doi:10.1007/s003390101241

Cited by 101 publications

(101 citation statements)

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“…This approach is called the time of flight (TOF) imaging method. More details about this imaging technique can be found in 15,19,23,28,29 . For polycrystalline samples, sudden increases of transmission/ decreases of attenuation occur at certain neutron wavelengths () in the recorded spectra.…”

Section: Time Of Flight Energy Resolved Neutron Imagingmentioning

confidence: 99%

“…Previously feasibility of studying of these important phenomena for SOC development by means of energy resolved neutron imaging has been presented 12 . This technique applied to polycrystalline granular and porous materials can provide spatially resolved information about crystal structure, crystalline phases, texture and strain fields [15][16][17][18][19][20][21][22][23][24] . It has been shown in 12 that due to excellent neutron scattering properties of Ni, neutron imaging holds a particularly great potential for characterization of nickel-based components of solid oxide cells and the feasibility of applying energy resolved neutron imaging to investigations of Ni and NiO phase distributions in anode supports for SOFC was demonstrated.…”

Section: Introductionmentioning

confidence: 99%

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Phase Transition Mapping by Means of Neutron Imaging in SOFC Anode Supports during Reduction under Applied Stress

et al. 2015

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Mechanical and electrochemical performance of layers composed of Ni-YSZ cermet in solid oxide fuel and electrolysis cells (SOC) depends on their microstructure and initial internal stresses. After sintering the manufacturing conditions, i.e. temperature, atmosphere and loads, can influence the microstructure and in particular the internal stresses in the Ni-YSZ layer and thereby the cell performance. Spatially resolved observation of the phase transition during reduction can provide information on how parameters like temperature and external load influence the reaction progress. This information is crucial for optimization of the SOC performance. In this work the measurements with energy resolved neutron imaging of the phase transition during the NiO-YSZ reduction performed at different temperatures with and without applied load, are presented. The results indicate a link between reduction rate and stress, which will influence the initial stress field of the SOC stacks.

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Section: Time Of Flight Energy Resolved Neutron Imagingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phase Transition Mapping by Means of Neutron Imaging in SOFC Anode Supports during Reduction under Applied Stress

et al. 2015

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“…λ = ht ml . The TOF method has the advantage that each pulse contains the full thermalized neutron spectrum and so a large number of Bragg edges [13] can be observed in a single measurement.…”

Section: Introductionmentioning

confidence: 99%

Modelling of an imaging beamline at the ISIS pulsed neutron source

Burca¹,

Kockelmann²,

James³

et al. 2013

J. Inst.

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A combined neutron imaging and neutron diffraction facility, IMAT, is currently being built at the pulsed neutron spallation source ISIS in the U.K. A supermirror neutron guide is required to combine imaging and diffraction modes at the sample position in order to obtain suitable time of flight resolutions for energy selective imaging and diffraction experiments. IMAT will make use of a straight neutron guide and we consider here the optimization of the supermirror guide dimensions and characterisation of the resulting beam characteristics, including the homogeneity of the flux distribution in space and energy and the average and peak neutron fluxes. These investigations take into account some main design criteria: to maximise the neutron flux, to minimise geometrical artefacts in the open beam image at the sample position and to obtain a good energy resolution whilst retaining a large neutron bandwidth. All of these are desirable beam characteristics for the proposed imaging and diffraction analysis modes of IMAT.

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“…2,3 Attenuation contrast neutron radiography and tomography allow observations of inner structures of bulk objects, e.g., differences in density, cracks, pores, water, and hydrogen concentrations and uptake. [6][7][8] By means of advanced techniques, e.g., energy resolved neutron imaging, [9][10][11][12] it is possible to gain spatially resolved information about the presence of different structural phases, texture related features or strains. 13 for corresponding observations of the kinetics of many important processes including phase transitions and changes in microstructure and crystal structure or stress fields in materials under variable conditions.…”

Section: Introductionmentioning

confidence: 99%

Flexible sample environment for high resolution neutron imaging at high temperatures in controlled atmosphere

Makowska

Kuhn

Cleemann

et al. 2015

Review of Scientific Instruments

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High material penetration by neutrons allows for experiments using sophisticated sample environments providing complex conditions. Thus, neutron imaging holds potential for performing in situ nondestructive measurements on large samples or even full technological systems, which are not possible with any other technique. This paper presents a new sample environment for in situ high resolution neutron imaging experiments at temperatures from room temperature up to 1100 °C and/or using controllable flow of reactive atmospheres. The design also offers the possibility to directly combine imaging with diffraction measurements. Design, special features, and specification of the furnace are described. In addition, examples of experiments successfully performed at various neutron facilities with the furnace, as well as examples of possible applications are presented. This covers a broad field of research from fundamental to technological investigations of various types of materials and components.

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Engineering applications of Bragg-edge neutron transmission

Cited by 101 publications

References 0 publications

Phase Transition Mapping by Means of Neutron Imaging in SOFC Anode Supports during Reduction under Applied Stress

Phase Transition Mapping by Means of Neutron Imaging in SOFC Anode Supports during Reduction under Applied Stress

Modelling of an imaging beamline at the ISIS pulsed neutron source

Flexible sample environment for high resolution neutron imaging at high temperatures in controlled atmosphere

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