3Y-TZP Toughened and Oxidation-resistant U3Si2 Composites for Accident Tolerant Fuels
Journal of Nuclear Materials(2021)
摘要
In this work, we report an innovative approach synergizing multiple effects of microstructure control, oxide protection and phase transformation-induced mechanically toughening to develop advanced U3Si2 fuels with state-of-the-art materials properties. 3Y-TZP (3 mol% yttria doped stabilized tetragonal zirconia) additives are incorporated and uniformly distributed into the SPS-densified U3Si2 fuel matrix, enhancing materials fracture toughness up to 4.04 MPa m1/2. The 3Y-TZP incorporated U3Si2 composite pellets show significantly improved onset temperature of oxidation above 560 °C, which can be further improved to 617 °C with 3 vol% addition by post-sintering thermal annealing. The development of mechanically tough and oxidation-resistant U3Si2 with minimal additive represents a major step forward towards realizing the potential of high density U3Si2 as the leading fuel concept to increase accidence tolerance of nuclear energy systems.
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关键词
Yttria-doped stabilized tetragonal zirconia,phase transformation-induced toughening,fracture toughness,oxidation resistance,Accident tolerant fuels
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