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Characterization of crack self-healing of silicon carbide by hot press sintering

열간가압소결법으로 제조한 탄화규소의 균열자기치유 특성

  • Received : 2016.03.31
  • Accepted : 2016.04.19
  • Published : 2016.04.30

Abstract

In this study, it was investigated that characteristic of crack-self-healing of hot-pressed SiC. SiC ceramics was sintered with $Al_2O_3$ and $Y_2O_3$ sintering additive by hot press. Sintering was performed in hot-press furnace in flowing argon (Ar), holding for 3 hr under $1950^{\circ}C$ and 50 MPa. The sintered SiC was machined into 3-point bending strength specimen of $3{\times}4{\times}40mm$, and introduced pre-crack by Vickers indentation at 49.6 N. Specimens were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), 3-point bending strength after heat treatment at $1200{\sim}1400^{\circ}C$ for 1~10 hr. The best crack-self-healing ability was achieved 770 MPa 3-point bending strength by heat treatment at $1300^{\circ}C$ for 5 hr.

Keywords

Silicon carbide;Silicon oxide;Crack-self-healing;Hot press;Oxidation

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