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Mechanical Properties of Si3N4 Ceramic Composites with Aligned Whisker Seeds

배향된 휘스커 종자에 의해 제조된 질화규소 세라믹 복합체의 기계적 특성

Kim, Han-Gil;Bang, Kook-Soo;Jung, Sang-Jin;Park, Chan
김한길;방국수;정상진;박찬

  • Received : 2012.11.07
  • Accepted : 2013.04.19
  • Published : 2013.04.30

Abstract

Four kinds of silicon nitride composites with tri-laminate structure were prepared by stacking tapes with aligned ${\beta}-Si_3N_4$ whisker seeds. The composites were fabricated using a modified tape casting method for enhanced alignment of the whisker seeds. The relative densities of all four samples reached 99% at room temperature. The three-point flexural strengths of the samples according to the stacking sequences were measured at both room temperature and 1723 K. The high temperature strength of sample WWW was $457{\pm}14$ MPa. The fracture of sample WWW occurred mainly along the grain boundary. The room temperature strengths of samples OOO, OWO, WOW, and WWW were $430{\pm}32$ MPa, $470{\pm}19$ MPa, $700{\pm}14$MPa, and $940{\pm}14$ MPa, respectively.

Keywords

$Si_3N_4$ composites;Gas pressure sintering;Flexural strength;Whisker seeds;Mechanical property;Tape casting

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Acknowledgement

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