Effect of Composition on the Hardness and Toughness in PZT-PYW Ceramics

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J. Korean Ceram. Soc. > Volume 31(3); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(3): 305.

PZT-PYW 세라믹스의 조성변화가 경도 및 인성에 미치는 영향

류소연, 임대순, 윤석진¹, 김현재¹

고려대학교 재료공학과
¹한국과학기술연구원 세라믹스부

Effect of Composition on the Hardness and Toughness in PZT-PYW Ceramics

ABSTRACT

In this paper, a change of fracture toughness and hardness in PZT-PYW ceramics system before and after poling treatment was measured to investigate the effect of composition on the mechanical properties in PZT-PYW ceramics. The hardness of the PZT-PYW ceramics increased with increasing mole fraction of PYW. The fracture toughness achieved maximum values for x=0.03. Both of the hardness and the fracture toughness also increased with poling treatment. The variation of both hardness and fracture toughness with increasing PYW mole fracture was explained by the change in microstructures such as grain size and second phase. The difference in hardness and fracture toughness in the electrically poled and unpoled specimens was also explained on the bases of internal stress.