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Title: Raman spectroscopic investigation of graphitization of diamond during spark plasma sintering of UO 2 -diamond composite nuclear fuel

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1341162
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 475; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 15:26:15; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Chen, Zhichao, Subhash, Ghatu, and Tulenko, James S. Raman spectroscopic investigation of graphitization of diamond during spark plasma sintering of UO 2 -diamond composite nuclear fuel. Netherlands: N. p., 2016. Web. doi:10.1016/j.jnucmat.2016.03.015.
Chen, Zhichao, Subhash, Ghatu, & Tulenko, James S. Raman spectroscopic investigation of graphitization of diamond during spark plasma sintering of UO 2 -diamond composite nuclear fuel. Netherlands. doi:10.1016/j.jnucmat.2016.03.015.
Chen, Zhichao, Subhash, Ghatu, and Tulenko, James S. 2016. "Raman spectroscopic investigation of graphitization of diamond during spark plasma sintering of UO 2 -diamond composite nuclear fuel". Netherlands. doi:10.1016/j.jnucmat.2016.03.015.
@article{osti_1341162,
title = {Raman spectroscopic investigation of graphitization of diamond during spark plasma sintering of UO 2 -diamond composite nuclear fuel},
author = {Chen, Zhichao and Subhash, Ghatu and Tulenko, James S.},
abstractNote = {},
doi = {10.1016/j.jnucmat.2016.03.015},
journal = {Journal of Nuclear Materials},
number = C,
volume = 475,
place = {Netherlands},
year = 2016,
month = 7
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.jnucmat.2016.03.015

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  • Energetic composite powders consisting of sol-gel derived nanostructured tungsten oxide were produced with various amounts of micrometer-scale tantalum fuel metal. Such energetic composite powders were ignition tested and results show that the powders are not sensitive to friction, spark and/or impact ignition. Initial consolidation experiments, using the High Pressure Spark Plasma Sintering (HPSPS) technique, on the sol-gel derived nanostructured tungsten oxide produced samples with higher relative density than can be achieved with commercially available tungsten oxide. The sol-gel derived nanostructured tungsten oxide with immobilized tantalum fuel metal (Ta - WO{sub 3}) energetic composite was consolidated to a density of 9.17more » g.cm{sup -3} or 93% relative density. In addition those parts were consolidated without significant pre-reaction of the constituents, thus the sample retained its stored chemical energy.« less
  • Based on the amorphization of zeolites, an order–disorder transition method was used to prepare silica glass via Spark Plasma Sintering (SPS). In order to get a better understanding about the mechanism of amorphization induced by SPS, the intermediate products in this process were prepared and characterized by different characterization techniques. X-ray diffraction and High-energy synchrotron X-ray scattering show a gradual transformation from ordered crystal to glass. Local structural changes in glass network including Si–O bond length, O–Si–O bond angle, size of rings, coordination were detected by Infrared spectroscopy and {sup 29}Si magic-angle spinning nuclear magnetic resonance (NMR) spectroscopy. Topologically ordered,more » amorphous material with a different intermediate-range structure can be obtained by precise control of intermediate process which can be expected to optimize and design material. - Graphical abstract: Low-density, ordered zeolites collapse to the rigid amorphous glass through spark plasma sintering. The intermediate-range structure formed in the process of order–disorder transition may give rise to specific property. - Highlights: • Order–disorder transition process of ZSM-5 induced by spark plasma sintering was investigated using several methods including XRD, High-energy synchrotron X-ray scattering, SAXS, IR, NMR, ect. • Order–disorder transition induced by SPS was compared with TIA and PIA. • Three stages has been divided during the whole process. • The collapse temperature range which may give rise to intermediate-range structure has been located.« less
  • Bulk polycrystalline nickel compact was processed by spark plasma sintering from heterogeneous powder consisting of a mixture of nanometer and micrometer sized particles. The consolidated samples inherited the bimodal structure of the starting powder and was composed of ~ 55 vol.% coarse-grained (with the grain size larger than 1 μm) and ~ 45 vol.% ultrafine-grained (with an average grain size of ~ 550 nm) components. The deformation mechanisms were established by EBSD, X-ray line profile analysis and in-situ TEM observations. In the ultrafine-grained volume, the deformation occurred mainly through the activation of dislocation sources emitting full or partial dislocation eithermore » from grain interior or grain boundaries. Besides dislocation activity, rolling and sliding of nanograins were also observed during deformation by in-situ transmission electron microscopy, which have a considerable contribution to the observed high strain rate sensitivity of the bimodal microstructure. The cracks formed during deformation easily propagated in the nanograin regions due to the weaker particle bonding caused by the relatively high fraction of native oxide layer on the surface of the initial nanoparticles. - Highlights: • Bulk bimodal polycrystalline Ni was processed by SPS from a heterogeneous powder. • High SRS of the flow stress was observed which enhanced ductility and strength. • In-situ TEM revealed dislocation sources inside and at the boundaries of UFGs. • Twinning, partial dislocation and NG rolling were observed at crack tip vicinity. • The high SRS pertained to both dislocation activity in CG and NG rolling.« less