389 results found
Zhang H, Jayaseelan DD, Bogomol I, et al., 2019, A novel microstructural design to improve the oxidation resistance of ZrB <inf>2</inf> -SiC ultra-high temperature ceramics (UHTCs), Journal of Alloys and Compounds, Pages: 958-964, ISSN: 0925-8388
© 2019 Directionally Solidified 72.8 mol% ZrB 2 - 27.2 mol% SiC (equivalent to 20 vol%) composite was fabricated using a crucibleless-melting technique. Microstructural and XRD analyses confirmed the texturing of grains and lamellar structure. The Lotgering (00l) orientation factor was as high as 0.97. The thickness of the lamellae was about 5 μm. Bright-field TEM images confirmed that the eutectic composite has continuous ZrB 2 and SiC phases. Electron diffraction patterns from both the ZrB 2 and SiC phases were indexed as hexagonal and 3C-cubic structures, respectively. Line defects such as dislocations, planar defects such as stacking faults and twins were observed in the SiC. Oxidation studies performed at 1873K for 1 h demonstrated that the samples obtained by melting showed an improved oxidation resistance compared to ZrB 2 -SiC composites obtained via sintering due to the formation of a passivating continuous SiO 2 layer. The oxidation mechanisms are discussed, the orientation and SiC lamellae acted as an effective barrier to the inward oxygen flux and played a key role in retarding oxidation.
© 2019 Elsevier Ltd Oxidation of UC was studied from 873 to 1173 K in air and in 10 Pa oxygen using a High Temperature Environmental SEM (HT-ESEM). Conversion to U 3 O 8 improved when using 873 K as the oxide product was a fine powder. At higher temperatures (973 K to 1173 K) oxidation slowed due to a densification process with formation of coarse fragments. The oxide fragmentation at 973 K and 1073 K and oxide pulverisation at 873 K were observed in situ in a HT-ESEM. Cracking induced fragmentation and pulverisation was linked to stresses generated from the volumetric transformation from UC to U 3 O 8 .
Pletser D, Ohashi T, Yoshii Y, et al., 2018, Temperature dependent volatilisation behaviour of Cs from two commercial adsorbents used at Fukushima measured using novel experimental apparatus, PROGRESS IN NUCLEAR ENERGY, Vol: 109, Pages: 214-222, ISSN: 0149-1970
Giorgi E, Grasso S, Zapata-Solvas E, et al., 2018, Reactive carbothermal reduction of ZrC and ZrOC using Spark Plasma Sintering, ADVANCES IN APPLIED CERAMICS, Vol: 117, Pages: S34-S47, ISSN: 1743-6753
Hsieh Y-H, Humphry-Baker SA, Horlait D, et al., 2018, Durability of hot uniaxially pressed Synroc derivative wasteform for EURO-GANEX wastes, JOURNAL OF NUCLEAR MATERIALS, Vol: 509, Pages: 43-53, ISSN: 0022-3115
Fossati PCM, Rushton MJD, Lee WE, 2018, Atomic-scale description of interfaces in rutile/sodium silicate glass-crystal composites, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 20, Pages: 17624-17636, ISSN: 1463-9076
Gasparrini C, Chater RJ, Horlait D, et al., 2018, Zirconium carbide oxidation: Kinetics and oxygen diffusion through the intermediate layer, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 101, Pages: 2638-2652, ISSN: 0002-7820
Patra N, Al Nasiri N, Jayaseelan DD, et al., 2018, Thermal properties of C-f/HfC and C-f/HfC-SiC composites prepared by precursor infiltration and pyrolysis, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 38, Pages: 2297-2303, ISSN: 0955-2219
Chinnam RK, Fossati PCM, Lee WE, 2018, Degradation of partially immersed glass: A new perspective, JOURNAL OF NUCLEAR MATERIALS, Vol: 503, Pages: 56-65, ISSN: 0022-3115
Ojovan MI, Burakov BE, Lee WE, 2018, Radiation-induced microcrystal shape change as a mechanism of wasteform degradation, JOURNAL OF NUCLEAR MATERIALS, Vol: 501, Pages: 162-171, ISSN: 0022-3115
Lerdprom W, Bhowmik A, Grasso S, et al., 2018, Impact of spark plasma sintering (SPS) on mullite formation in porcelains, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 101, Pages: 525-535, ISSN: 0002-7820
Zapata-Solvas E, Gomez-Garcia D, Dominguez-Rodriguez A, et al., 2018, High temperature creep of 20 vol%. SiC-HfB2 UHTCs up to 2000 degrees C and the effect of La2O3 addition, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 38, Pages: 47-56, ISSN: 0955-2219
Lerdprom W, Zapata-Solvas E, Jayaseelan DD, et al., 2017, Impact of microwave processing on porcelain microstructure, CERAMICS INTERNATIONAL, Vol: 43, Pages: 13765-13771, ISSN: 0272-8842
Gasparrini C, Podor R, Horlait D, et al., 2017, Zirconium Carbide Oxidation: Maltese Cross Formation and Interface Characterization, Oxidation of Metals, Vol: 88, Pages: 509-519, ISSN: 0030-770X
© 2016, The Author(s). Oxidation of dense hot-pressed ZrC specimens from 1073 to 1473 K was investigated using an in situ technique: HT-ESEM. Cuboid specimens were monitored on the surface and on edges and corners during oxidation in order to understand the influence of crack formation and propagation on the Maltese cross shape development of the oxide. The oxidation mechanism comprised three steps: (1) delamination of sample edges, (2) crack formation at corners and (3) crack propagation towards the inner core and formation of microcracks parallel to the interface that increase the accessible surface area followed by a drastic volume expansion. The microcrack pattern is found to be repetitive as if a cyclic debonding of the interface occurred. Characterization of the interface by TEM and HRTEM revealed the interface between ZrC and ZrO2 to comprise a 2 µm thick amorphous carbon matrix with ZrO2 nanocrystals embedded in it.
Gasparrini C, Podor R, Horlait D, et al., 2017, Oxidation of UC: An in situ high temperature environmental scanning electron microscopy study, JOURNAL OF NUCLEAR MATERIALS, Vol: 494, Pages: 127-137, ISSN: 0022-3115
Humphry-Baker SA, Peng K, Lee WE, 2017, Oxidation resistant tungsten carbide hardmetals, INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, Vol: 66, Pages: 135-143, ISSN: 0263-4368
Zapata-Solvas E, Hadi MA, Horlait D, et al., 2017, Synthesis and physical properties of (Zr1-x,Ti-x)(3)AlC2 MAX phases, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 100, Pages: 3393-3401, ISSN: 0002-7820
Al Nasiri N, Patra N, Jayaseelan DD, et al., 2017, Water vapour corrosion of rare earth monosilicates for environmental barrier coating application, CERAMICS INTERNATIONAL, Vol: 43, Pages: 7393-7400, ISSN: 0272-8842
Bai Y, Qi X, Duff A, et al., 2017, Density functional theory insights into ternary layered boride MoAlB, ACTA MATERIALIA, Vol: 132, Pages: 69-81, ISSN: 1359-6454
Faber KT, Asefa T, Backhaus-Ricoult M, et al., 2017, The role of ceramic and glass science research in meeting societal challenges: Report from an NSF-sponsored workshop, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 100, Pages: 1777-1803, ISSN: 0002-7820
Zapata-Solvas E, Christopoulos S-RG, Ni N, et al., 2017, Experimental synthesis and density functional theory investigation of radiation tolerance of Zr-3(Al1-xSix)C-2 MAX phases, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 100, Pages: 1377-1387, ISSN: 0002-7820
Kota S, Zapata-Solvas E, Chen Y, et al., 2017, Isothermal and Cyclic Oxidation of MoAlB in Air from 1100 degrees C to 1400 degrees C, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 164, Pages: C930-C938, ISSN: 0013-4651
Lerdprom W, Grasso S, Jayaseelan DD, et al., 2017, Densification behaviour and physico-mechanical properties of porcelains prepared using spark plasma sintering, ADVANCES IN APPLIED CERAMICS, Vol: 116, Pages: 307-315, ISSN: 1743-6753
Ojovan MI, Burakov BE, Lee WE, 2017, Destruction of Micro-crystal Containing Wasteforms by Charge-induced Crystal Shape Change on Self-irradiation, MRS ADVANCES, Vol: 2, Pages: 621-626, ISSN: 2059-8521
Juthapakdeeprasert J, Lerdprom W, Jayaseelan DD, et al., 2017, Cerium-Added alumina and cerium-Added zircon as high emissivity coatings for cement rotary kilns, Pages: 404-411
Lerdprom W, Li C, Jayaseelan DD, et al., 2017, Temperature dependence of electrical conductivity of a green porcelain mixture, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 37, Pages: 343-349, ISSN: 0955-2219
Burr PA, Horlait D, Lee WE, 2017, Experimental and DFT investigation of (Cr, Ti)(3)AlC2 MAX phases stability, MATERIALS RESEARCH LETTERS, Vol: 5, Pages: 144-157, ISSN: 2166-3831
Cedillos-Barraza O, Manara D, Boboridis K, et al., 2016, Investigating the highest melting temperature materials: A laser melting study of the TaC-HfC system, SCIENTIFIC REPORTS, Vol: 6, ISSN: 2045-2322
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