• Title/Summary/Keyword: PVA-Al(III) complex

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The Effect of PVA-Al(III) Complex on the Pore Formation and Grain Growth of UO$_2$ Sintered Pellet (PVA-Al(III) 착물이 UO$_2$ 소결체의 기공형성과 결정립성장에 미치는 영향(I))

  • 이신영;김형수;노재성
    • Journal of the Korean Ceramic Society
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    • v.35 no.8
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    • pp.783-790
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    • 1998

  • 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.

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The Effect of PVA-Al(III) Complex on Pore Formation and Grain Growth of $UO_2$ Sintered Pellet (II) (PVA-A(III) 착물이 $Uo_2$ 소결체의 기공형성과 결정립성장에 미치는 영향(II))

  • 이신영;김형수;노재성
    • Journal of the Korean Ceramic Society
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    • v.36 no.8
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    • pp.782-790
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    • 1999

  • The compressibility sinterability sintering behaviour and thermal stability of AlOOH added UO2 pellt and PVA-Al(III) complex added UO2 pellet were investigated respectively. Compared with characteristics of AlOOH added UO2 pellet the green density and the sintered density of PVA-Al(III) complex added UO2 pellet were lowered but the grain size and the pore size of that were more increased in accordance with higher compacting pressure. The AlOOH added UO2 pellet had the grain size of about 14${\mu}{\textrm}{m}$ with monomodal pore size distribution while the PVA-Al(III) complex added UO2 pellet had the grain size of about 42 ${\mu}{\textrm}{m}$ with bimodal pore size distribution. The PVA-A(III) complex added UO2 pellet had a similiar open porosity to the AlOOH added UO2 pellet and a lower resintered density change than the AlOOH added UO2 pellet.

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The Comparison of Sintering Characteristics between the PVA-Al(III) Complex added $UO_2$Pellet and AlOOH added $UO_2$pellet (PVA-Al(III) 착물 첨가 $UO_2$소결체와 AlOOH 첨가 $UO_2$소결체의 소결 특성 비교)

  • Lee, Sin-Yeong;Yu, Ho-Sik;Lee, Seung-Jae;Kim, Hyeong-Su;Bae, Gi-Gwang
    • Korean Journal of Materials Research
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    • v.10 no.1
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    • pp.55-61
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    • 2000

  • The sintering characteristics of PVA-Al(III) complex added $UO_2$ pellet and AlOOH added $UO_2$pellet were compared. The major phase of PVA-Al(III) complex and AlOOH decomposed at $1000^{\circ}C$ in $H_2$atmosphere was $\theta-Al_2O_3$. Compared with the apparent density of pure $UO_2$, that of AlOOH added $UO_2$ powder was higher but that of PVA-Al(III) complex was lower. the densification of AlOOH added $UO_2$ pellet was initiated at about $800^{\circ}C$, the densification of PVA-Al(III) complex added $UO_2$ pellet was initiated at about $900^{\circ}C$ respectively. In a view of pore size distribution, the PVA-Al(III) complex added $UO_2$ pellet appeared as monomodal type, whereas the AlOOH added $UO_2$ pellet appeared as bimodal type. The grain size of AlOOH added $UO_2$ pellet was about $13\mu\textrm{m}$ but the grain size of PVA-Al(III) complex added $UO_2$ pellet was increased up to about $36\mu\textrm{m}$.

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