【摘 要】
：
The high burn-up structure (HBS) is characterized by the grain size of 100-300 nm and a porosity of up to 20％,which is formed at the rim of the nuclear fuel pellet due to 2-3 times higher local burn-up during the in-pile irradiation.HBS is considered a ne
【机 构】
：
Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Che
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The high burn-up structure (HBS) is characterized by the grain size of 100-300 nm and a porosity of up to 20％,which is formed at the rim of the nuclear fuel pellet due to 2-3 times higher local burn-up during the in-pile irradiation.HBS is considered a new potential structure for high-performance fuels.However,it is difficult to prepare HBS by conventional sintering methods.In this study,flash sintering was used to prepare HBS using CeO2 as a surrogate for a preliminary inves-tigation.A new experimental configuration for rapid sintering of CeO2 pellets was provided,in which the green body can be rapidly preheated and pressure-assisted by the induction heating electrodes.An insulated quartz tube was used as the die for the flash sintered samples,allowing the current to flow through the sample and providing a stable condition for applying an external pressure of approximately 5.3-7.0 MPa during flash sintering process.Using an initial electric field of 141 V cm-1 and holding for 1-7 min at the maximum current density of～ 98 mA mm-2,CeO2 ceramics with a grain size of 114-282 nm and a relative density of 75.4-99.7％ were prepared.The densification and microstructure evolution behaviors during flash sintering in this new experimental configuration have been discussed in detail.This new experimental configuration may provide a promising approach for preparing UO2 ceramics and their HBS.
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