The Effect of PVA-Al(III) Complex on the Pore Formation and Grain Growth of UO<TEX>$_2$</TEX> Sintered Pellet

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J. Korean Ceram. Soc. > Volume 35(8); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(8): 783.

PVA-Al(III) 착물이 UO$_2$ 소결체의 기공형성과 결정립성장에 미치는 영향(I)

이신영, 김형수¹, 노재성²

한국원전연료 주식회사
¹한국원전연료주식회사
²충남대학교 정밀공업화학과

The Effect of PVA-Al(III) Complex on the Pore Formation and Grain Growth of UO$_2$ Sintered Pellet

ABSTRACT

The characterization of the complexation reaction of PVA and Al(III) ion at different pH and the sint-ering behaviour of UO2 containing the PVA-Al(III) complexes were investigated. Compared with pure PVA powder the complexed PVA-Al(III) powder had compacter shape and lower decomposition temperature The major phase of PVA-Al(III) complex decomposed at 90$0^{circ}C$ was $alpha$-Al2O3 The PVA-Al(III) complex formed at pH 9 had the lowest relative viscosity the highest Al content of 36% and the smallest particle size of 19${mu}{textrm}{m}$ While the pure UO2 pellet appeared with bimodal one. The grain size of the pure UO2 pellet was 7${mu}{textrm}{m}$ but that of the PVA-Al(III) complex added UO2 pellet was increased up to 36${mu}{textrm}{m}$ The largest grain size was ob-tained when the PVA-Al(III) complex formed at pH9 was added and the PVA-Al(III) complex formed at pH 11 had the greatest effect on increasing pore size.

Key words: UO$_2$ pellet, PVA-Al(III) complex, Pore formation, Grain growth