| $UO_2$ 소결체의 특성 및 미세구조에 미치는 첨가제의 영향 |
| 유호식, 이신영, 이승재, 강권호, 김형수1 |
한전 원자력 연료(주)
1한국원자력연구소 |
| Effects of Additives on the Characteristics and Microstructure of $UO_2$ Pellet |
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| ABSTRACT |
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Effect of various kinds of additive such as AlOOH, Al(OH)3, Al2Si2O5(OH)4, Nb2O5, TiO2 and MgO on the properties and microstructures of UO2 pellet has been examined. All the tested dopants had played a role to reduce sintered density and open porosity. It was revealed that the addition of TiO2 made pellet more stable thermally. UO2 pellet doped with 0.2wt% TiO2 was swelled rather than densified after annealing for 24 hrs at 1$700^{circ}C$. It was attributed to large pore with spherical shape. Titinia and silicon coexisted with Al element were more effective to increase grain size than other additives. It could be also revealed that the formation of liquid phase was the main cause of grain growth. |
| Key words:
$UO_2$ pellet, Additives, Pore shape, Grain size, Liquid phase |
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