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급속응고된 비정질 Zr-Be 합금 용가재를 이용한 Zircaloy-4의 브레이징 특성

Brazing Characteristics of Zircaloy-4 Using Rapidly Solidified Amorphous Zr-Be Alloy Filler Metals

  • 김상호 (한국기술교육대학교 신소재공학과) ;
  • 고진현 (한국기술교육대학교 신소재공학과) ;
  • 박춘호 (한전 원자력연료주식회사) ;
  • 김성규 (부경대학교 생산가공공학과)
  • 발행 : 2002.02.01

초록

This study was conducted to investigate the brazing characteristics between Zircaloy-4 nuclear fuel cladding tubes and bearing pads with filler metals of amorphous $Zr_{1-x}Be_x$(0.3$\leq$x$\leq$0.5) binary alloy, in which they were produced in the ribbon form by the melt-spinning metod. The crystallization behavior, stability, hardness and micro-structure of brazed zone were examined by X-ray diffraction, differential scanning calorimetry, micro-Vickers hardness test, optical microscopy, and transmission electron microscopy. $Zr_{1-x}Be_x$(0.3$\leq$x$\leq$0.4) amorphous alloys were crystallized to $\alpha$-Zr with increasing the temperature, and the rest were transformed to ZrBe$_2$at higher temperatures. On the other hand, $Zr_{1-x}Be_x$(0.4$\leq$x$\leq$0.5) amorphous alloys were crystallized to $\alpha$-Zr and ZrBe$_2$, simultaneously. The thickness of the layer brazed with amorphous alloy was increased with increasing the beryllium content due to the higher diffusion of Be. The morphology of brazed layer with PVD Be filler metal showed dendrite while that brazed with amorphous alloys appeared globular. Micro-Vickers hardness of brazed zone increased as the beryllium content of filler metal was decreased.

키워드

참고문헌

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