Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Joining of Presureless Sintered SiC Ceramics using $MgO-Al_2O_3-SiO_2$ System

$MgO-Al_2O_3-SiO_2$계를이용한 상압소결 SiC의 접합

  • 이홍림 (연세대학교 세라믹공학과) ;
  • 남서우 (연세대학교 세라믹공학과) ;
  • 한봉석 (연세대학교 세라믹공학과) ;
  • 박병학 (포항산업과학연구원 구조세라믹스팀) ;
  • 한동빈 (포항산업과학연구원 구조세라믹스팀)
  • Published : 1997.07.01
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Abstract

Pressure sintered SiC specimens were joined using MgO-Al2O3-SiO2 (MAS) glass which has a thermal expansion coefficient similar to that of SiC. MAS melt showed excellent behavior of wetting on the SiC substrate over 148$0^{\circ}C$, and the wettability was much influenced by the joining atmosphere. The joining was conducted at 150$0^{\circ}C$ for 30 min in Ar atmosphere. The flexural strength of the joined specimen shows 342~380 MPa up to 80$0^{\circ}C$, which is almost the same as that of as-recieved SiC specimen. However, the flexural strength of the joined specimen decreased to about 80 MPa at 90$0^{\circ}C$ due to softening of the glass melt. The analyses od XRD and WDS show that the reaction between the SiC specimen and the MAS melt produces the oxycarbide glass, which had a high strength and a good stability at high temperatures.

Keywords

References

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