한국재료학회지 (Korean Journal of Materials Research)

  • 제26권12호
  • /
  • Pages.751-756
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  • 2016
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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확산 접합에 의해 제조된 텅스텐-레늄 합금/티타늄/그래파이트 접합체의 미세구조 및 고온 안정성

Interfacial Microstructure of Diffusion-Bonded W-25Re/Ti/Graphite Joint and Its High-Temperature Stability

  • Kim, Joo-Hyung (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology) ;
  • Baek, Chang Yeon (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Dong Seok (Korea Atomic Energy Research Institute) ;
  • Lim, Seong Taek (Agency for Defense Development) ;
  • Kim, Do Kyung (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology)
  • 투고 : 2016.11.01
  • 심사 : 2016.11.16
  • 발행 : 2016.12.27
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초록

Graphite was diffusion-bonded by hot-pressing to W-25Re alloy using a Ti interlayer. For the joining, a uniaxial pressure of 25 MPa was applied at $1600^{\circ}C$ for 2 hrs in an argon atmosphere with a heating rate of $10^{\circ}C\;min^{-1}$. The interfacial microstructure and elemental distribution of the W-25Re/Ti/Graphite joints were analyzed by scanning electron microscopy (SEM). Hot-pressed joints appeared to form a stable interlayer without any micro-cracking, pores, or defects. To investigate the high-temperature stability of the W-25Re/Ti/Graphite joint, an oxy-acetylene torch test was conducted for 30 seconds with oxygen and acetylene at a 1.3:1 ratio. Cross-sectional analysis of the joint was performed to compare the thickness of the oxide layer and its chemical composition. The thickness of W-25Re changed from 250 to $20{\mu}m$. In the elemental analysis, a high fraction of rhenium was detected at the surface oxidation layer of W-25Re, while the W-25Re matrix was found to maintain the initial weight ratio. Tungsten was first reacted with oxygen at a torch temperature over $2500^{\circ}C$ to form a tungsten oxide layer on the surface of W-25Re. Then, the remaining rhenium was subsequently reacted with oxygen to form rhenium oxide. The interfacial microstructure of the Ti-containing interlayer was stable after the torch test at a temperature over $2500^{\circ}C$.

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