Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Synthesis and Mechanical Properties of Mullite-PSZ Composites by Sol-Gel Process

Sol-Gel법에 의한 Mullite-PSZ 복합체의 제조 및 특성에 관한 연구

  • 최용식 (국립공업시험원 도자기시험소) ;
  • 박일주 (국립공업시험원 도자기시험소) ;
  • 이경희 (명지대학교 무기재료공학과) ;
  • 이병하 (명지대학교 무기재료공학과) ;
  • 김영호 (명지대학교 무기재료공학과)
  • Published : 1991.05.01
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Abstract

Mullite-PSZ powders were synthesized by the sol-gel process using Al(sec-OC4H9)3, Si(OC2H5)4, ZrOCl2$.$8H2O and YCl3 solution and the characteristics of synthesized powders were studied. The sinterability and mechanical properties of powder compacts sintered at 1670$^{\circ}C$ for 4hr were also studied for various PSZ contents. ${\gamma}$-Al2O3(Al-Si spinel) formed at 980$^{\circ}C$ from amorphous dried gel, and mullite as well as ZrO2 formed above 1200$^{\circ}C$. At the room temperature, ZrO2 was a mixture of tetragonal and monoclinic phases. The specimens were densified to 97∼98% except the specimen containing 25 vol% PSZ which showed the relative density of 94%. The K1c value increased with the PSZ content and showed a maximum value of 4.1 MN/m3/2 at 25 vol% PSZ; this value was about 50% higher than that of the mullite without PSZ. Flexural strength had a maximum value of 280 Mn/㎡ at 20 vol% PSZ. In contrast, at 25 vol%, the flexural strength was even lower than that of the mullite possibly due to higher porosity of 6%.

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References

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