Proceedings of the KWS Conference (대한용접접합학회:학술대회논문집)

The Korean Welding and Joining Society (대한용접접합학회)
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Preliminary Investigation on Joining Performance of Intermediate Heat Exchanger Candidate Materials of Very High Temperature Reactor(VHTR) by Vacuum Brazing

진공 브레이징을 이용한 고온가스냉각로 중간 열교환기 후보재료의 접합성능에 관한 예비시험

  • 김경호 (한국원자력연구소 원자력재료기술개발부) ;
  • 김광호 (한국원자력연구소 원자력재료기술개발부) ;
  • 이민구 (한국원자력연구소 원자력재료기술개발부) ;
  • 김흥회 (한국원자력연구소 원자력재료기술개발부) ;
  • 김성욱 (포항산업과학연구소 용접연구센터) ;
  • 김숙환 (포항산업과학연구소 용접연구센터)
  • Published : 2005.11.17
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Abstract

An intermediate heat exchanger(IHX) is a key component in a next-generation VHTR with process heat applications such as hydrogen production and also for an indirect gas turbine system. Therefore, high temperature brazing with nickel-based filler metal(MBF-15) was carried out to study the joining characteristic(microstucture, joining strength) of nickel-based superalloy(Haynes 230) by vacuum brazing. The experimental brazing was carried out at the brazing process, an applied pressure of about 0.74Mpa and the three kinds of brazing temperatures were 1100, 1150, and $1190^{\circ}C$ with holding time 5 minute. It's joining phenomena were analyzed by optical microscopy and scanning electron microscopy with EPMA. The results of microstructure in the centre-line region of a joint brazed with MBF-15 show a typical ternary eutectic of v-nickel, nickel boride and chromium boride.

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