The Korean Journal of Ceramics

한국세라믹학회 (The Korean Ceramic Society)
권호 표지

Evaluation of Shear-Induced Phase Transformation of $\beta$-Cristobalite by Fiber Push-Out Technique

  • Sang Jin Lee (Department of Materials Science and Engineering University of Illinois at Urbana-Champaign, Urbana) ;
  • Dong Zhu (Department of Materials Science and Engineering University of Illinois at Urbana-Champaign) ;
  • Jae Suk Sung (Korea Electronics Technology Institute)
  • 발행 : 1997.09.01
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초록

Shear-induced phase transformation behavior of chemically stabilized $\beta$-cristobalite was studied by the fiber push-out technique. To obtain the critical grain size for phase transformation, the hot-pressed polycrystalline $\beta$-cristobalite, which was used as the interphase between fiber and matrix, was annealed at $1300^{\circ}C$ for 10h. Two types of fibers, mullite and sapphire fiber, were used in this study. Debonding between mullite fiber and cristobalite interphase occurred at a critical load of 230 MPa. Static friction and fiber sliding were continuously followed by debonding. Shear-induced transformation induced cracks in the cristobalite interphase at the debonding stage. In the case of the sapphire fiber, the debonding occurred at a lower load of 180 MPa due to the residual stress in the interface caused by the difference in thermal expansion coefficients between the fiber and the cristobalite interphase. The load was insufficient for shear-induced phase transformation.

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