TiO2 doped UO2 fuels sintered by spark plasma sintering

Yao, Tiankai; Scott, Spencer; Xin, Guoqing; Lian, Jie

doi:10.1016/j.jnucmat.2015.11.025

Cited by 33 publications

(9 citation statements)

References 54 publications

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“…Table 1 summarized the comparison of the thermal-mechanical properties of the advanced fuel design 6 , 28 – 30 . Among them, the UO 2 -GNP composite fuel form prepared in this study shows the greatest promise with a simultaneously improved thermal conductivity and fracture toughness at a minimum loading of GNP (Note, the 1 wt.% GNP is 4.6 vol.% if density of graphite, 2.26 g/cm 3 is used for GNP).…”

Section: Resultsmentioning

confidence: 99%

Thermally-Conductive and Mechanically-Robust Graphene Nanoplatelet Reinforced UO2 Composite Nuclear Fuels

Yao

Xin

Scott

et al. 2018

Sci Rep

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Low thermal transport behavior along the radial direction of nuclear fuel pellets and pellet-cladding mechanical interaction significantly impact fuel performance and the safety of current nuclear energy systems. Here we report a new strategy of advanced fuel design in which highly thermally-conductive and mechanically-robust graphene nanoplatelets are incorporated into UO2 fuel matrix to improve fuel thermal-mechanical properties. The 2D geometry of the graphene nanoplatelets enables a unique lamellar structure upon fuel consolidation by spark plasma sintering. The thermal conductivity along the radial direction of the sintered fuel pellets at room temperature reaches 12.7 and 19.1 wm−1K−1 at 1 wt.% and 5 wt.% loadings of the graphene nanoplatelets, respectively, representing at least 74% and 162% enhancements as compared to pure UO2 fuel pellets. Indentation testing suggests great capability of the 2D graphene nanoplatelets to deflect and pin crack propagation, drastically improving the crack propagation resistance of fuel matrix. The estimated indentation fracture toughness reaches 3.5 MPa·m1/2 by 1 wt.% loading of graphene nano-platelets, representing a 150% improvement over 1.4 MPa·m1/2 for pure UO2 fuel pellets. Isothermal annealing of the composite fuel indicates that the graphene nano-platelet is able to retain its structure and properties against reaction with UO2 matrix up to 1150 °C.

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Section: Resultsmentioning

confidence: 99%

Thermally-Conductive and Mechanically-Robust Graphene Nanoplatelet Reinforced UO2 Composite Nuclear Fuels

Yao

Xin

Scott

et al. 2018

Sci Rep

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“…Spark plasma sintering was carried out using a Dr. Sinter ® SPS-211 Lx system with a procedure similar to our previous work. [15] To prepare each sample, approximately 1 g of powder was loaded into a graphite die, 10 mm in diameter. Graphite paper (0.20 mm thick) was used to envelope the powders, ensuring proper fit during assembly, ease of sample retrieval after sintering, and sufficient contact to facilitate the current passing through the assembly.…”

Section: Spark Plasma Sinteringmentioning

confidence: 99%

“…HEBM is a room temperature solid-state synthesis technique which allows for the simultaneous reduction of particle size and facilitation of phase transformations and/or incorporation of additives. HEBM has been previously utilized for the synthesis of nuclear fuels [15], photocatalysts [16], fuel cells [17], and nuclear waste forms [18]. HEBM was used in this study as the primary means of incorporating dopants into the ThO 2 matrix, and the additional effect of mechanically reducing the particle size allowed for a simple variation in starting particle sizes.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of lanthanum-doped thorium dioxide by high-energy ball milling and spark plasma sintering

Scott

Yao

et al. 2017

Journal of Nuclear Materials

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High-energy ball milling was used to synthesize Th 1-x La x O 2-0.5x (x = 0.09, 0.23) solid solutions, as well as improve the sinterability of ThO 2 powders. Dense La-doped ThO 2 pellets with theoretical density above 94% were consolidated by spark plasma sintering at temperatures above 1400 o C for 20 mins, and the densification behavior and the non-equilibrium effects on phase and structure were investigated. A lattice contraction of the SPS-densified pellets occurred with increasing ball milling duration, and a secondary phase with increased La-content was observed in La-doped pellets. A dependence on the La-content and sintering duration for the onset of localized phase segregation has been proposed. The effects of high-energy ball milling, La-content, and phase formation on the thermal diffusivity were also studied for La-doped ThO 2 pellets by laser flash measurement. Increasing La-content and high energy ball milling time decreases thermal diffusivity; while the sintering peak temperature and holding time beyond 1600 o C dramatically altered the temperature dependence of the thermal diffusivity beyond 600 o C.

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“…Namun, dopan yang ditambahkan ke dalam bahan bakar tidak boleh menurunkan sifat standar bahan bakar nuklir. Sehubungan dengan hal tersebut maka senyawa TiO 2 dipilih sebagai dopan dalam pembuatan bahan bakar pelet UO 2 berbutir besar dengan pertimbangan bahwa TiO 2 dapat meningkatkan mampu sinter serbuk dan mempromosikan pertumbuhan butir hingga ukuran butir UO 2 sinter sekitar 80 m serta perilaku transfer termalnya sangat baik [7] . Selain memperbesar ukuran butir pelet UO 2 , inovasi lain yang dilakukan para peneliti adalah untuk mencegah terjadinya kegagalan elemen bakar nuklir yaitu dengan penggunaan bahan bakar nuklir berlapis penyerap dapat bakar hidropobik atau Integrated Fuel Burnable Absorber (IFBA).…”

Section: Pendahuluanunclassified

KARAKTERISASI LAPISAN PENYERAP DAPAT BAKAR PADA PERMUKAAN PELET UO2 + DOPAN TiO2

Sungkono

Atmono

2017

urania

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ABSTRAKKARAKTERISASI LAPISAN PENYERAP DAPAT BAKAR PADA PERMUKAAN PELET UO 2 + DOPAN TiO 2 . Lapisan penyerap dapat bakar pada permukaan pelet UO 2 + dopan TiO 2 telah berhasil dibuat dengan menggunakan mertoda RF sputtering. Penelitian ini bertujuan untuk mendapatkan karakter mikrostruktur pelet UO 2 + dopan, ketebalan, kekerasan mikro, komposisi kimia dan struktur kristal lapisan penyerap dapat bakar pada permukaan pelet UO 2 . Penentuan mikrostruktur dan ketebalan lapisan dilakukan dengan menggunakan mikroskop optik, kekerasan lapisan dengan metode kekerasan mikro Vickers, komposisi kimia dengan spektrometri XRF dan struktur kristal dengan difraksi sinar-X. Hasil penelitian menunjukan bahwa semakin besar kandungan TiO 2 dalam pelet maka semakin besar ukuran butir dalam mikrostruktur pelet dan semakin tebal lapisan yang terbentuk pada permukaan pelet UO 2 . Kekerasan lapisan permukaan pelet UO 2 + dopan TiO 2 sinter relatif sama dan tidak bergantung pada konsentrasi dopan TiO 2 . Lapisan permukaan pelet UO 2 + 0,3 % TiO 2 , pelet UO 2 + 0,5 % TiO 2 dan pelet UO 2 + 0,7 % TiO 2 sinter mengandung unsur zirkonium masing-masing 1,97 g, 2,47 g dan 4,81 g. Lapisan penyerap dapat bakar pada permukaan pelet UO 2 + dopan TiO 2 sinter mempunyai fasa ZrB 2 dengan struktur kristal heksagonal.Kata Kunci: lapisan permukaan, penyerap dapat bakar, pelet UO 2 , mikrostruktur, kekerasan, komposisi kimia, struktur kristal.

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TiO2 doped UO2 fuels sintered by spark plasma sintering

Cited by 33 publications

References 54 publications

Thermally-Conductive and Mechanically-Robust Graphene Nanoplatelet Reinforced UO2 Composite Nuclear Fuels

Thermally-Conductive and Mechanically-Robust Graphene Nanoplatelet Reinforced UO2 Composite Nuclear Fuels

Fabrication of lanthanum-doped thorium dioxide by high-energy ball milling and spark plasma sintering

KARAKTERISASI LAPISAN PENYERAP DAPAT BAKAR PADA PERMUKAAN PELET UO2 + DOPAN TiO2

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