Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Effects of the Decomposition Residue of Compound Additive on Resintering Behavior

  • Kim, H.S. (Korea Atomic Energy Research Institute) ;
  • C.Y. Joung (Korea Atomic Energy Research Institute) ;
  • Kim, S.H. (Korea Atomic Energy Research Institute) ;
  • S.H. Na (Korea Atomic Energy Research Institute) ;
  • Lee, Y.W. (Korea Atomic Energy Research Institute) ;
  • D.S. Sohn (Korea Atomic Energy Research Institute)
  • Published : 2002.08.01
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Abstract

Various types of compounds were tested with the aspects of decomposition and formation of residue in a $CO_2$ or 7H$_2$+93$N_2$ atmosphere. The evaporation temperature range of each compound was determined from thermogravimetric curve. Decomposition of dicarbon amide, stearic acid, acrowax and zinc stearate was studied by thermogravimetry in $CO_2$ or in 7H$_2$+93$N_2$ atmosphere. All compounds were decomposed in $CO_2$ atmosphere at lower than 40$0^{\circ}C$, but the residue, ZnO remained for zinc stearate. ZnO did not decompose in $CO_2$ atmosphere up to 130$0^{\circ}C$, but reduced into Zn metal and disappeared in the temperature range of $600^{\circ}C$ to 120$0^{\circ}C$ in 7H$_2$+93$N_2$ atmosphere. The effect of residue, which trapped in closed pores of sintered pellet, on the thermal stability was studied using the resintering test at 1$700^{\circ}C$ in 7H$_2$+93$N_2$ atmosphere. In the case of oxidative sintered pellet with admixing zinc stearate, the cavity formation accompanied with a density drop after resintering is due to the pressure of the Zn gases trapped in the isolated pores.

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References

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