Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Hydrothermal Synthesis and Mechanical Characterization of ZrO2 by Y2O3 Stabilizer Contents

Y2O3안정화제 첨가량에 따라 수열합성법으로 제조된 ZrO2-Xmol% Y2O3분말의 합성 및 기계적 특성

  • Lee, Hak-Joo (Department of Materials Science and Engineering, Paichai University) ;
  • Kim, Taik-Nam (Department of Information and Electronic Materials Engineering, Paichai University) ;
  • Bea, Sung-Chul (Department of Information and Electronic Materials Engineering, Paichai University) ;
  • Go, Myung-Won (Department of Dental lab. Technology, Kwamng Yang Health College University) ;
  • Ryu, Jae-Kyung (Department of Dental Technology, Shinheung College University)
  • 이학주 (배재대학교대학원 재료공학과) ;
  • 김택남 (배재대학교 정보전자소재공학과) ;
  • 배성철 (배재대학교 정보전자소재공학과) ;
  • 고명원 (광양보건대학 치기공과) ;
  • 류재경 (신흥대학 치기공과)
  • Received : 2010.09.01
  • Accepted : 2010.10.04
  • Published : 2010.10.27
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Abstract

In this study, partially stabilized zirconia was synthesized using a chemical $Y_2O_3$ stabilizer and hydrothermal method. First, $YCl_3-6H_2O$ and $ZrCl_2O-8H_2O$ was dissolved in distilled water. Y-TZP (a $Y_2O_3$-doped toughened zirconia polycrystalline precursor) was also prepared by conventional co-precipitates in the presence of an excess amount of $NH_4OH$ solution under a fixed pH of 12. The Y-TZP precursors were filtered and repeatedly washed with distilled water to remove $Cl^-$ ions. $ZrO_2$-Xmol%$Y_2O_3$ powder was synthesized by a hydrothermal method using Teflon Vessels at $180^{\circ}C$ for 6 h of optimized condition. The powder added with the Xmol%- $Y_2O_3$ (X = 0,1,3,5 mol%) stabilizer of the $ZrO_2$ was synthesized. The crystal phase, particle size, and morphologies were analyzed. Rectangular specimens of $33mm{\times}8mm{\times}3$ mm for three-point bend tests were used in the mechanical properties evaluation. A teragonal phase was observed in the samples, which contains more than 3 mol% $Y_2O_3$. The $3Y-ZrO_2$ agglomerated particle size was measured at $7.01{\mu}m$. The agglomerated particle was clearly observed in the sample of 5 mol % $Y_2O_3-ZrO_2$, and and the agglomerated particle size was measured at 16.4 um. However, a 20 nm particle was specifically observed by FE-SEM in the sample of 3 mol% $Y_2O_3-ZrO_2$. The highest bending fracture strength was measured as 321.3 MPa in sample of 3 mol% $Y_2O_3-ZrO_2$.

Keywords

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