Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Grain Size and Heat-treating Atmosphere on the Phase Stability of Y-TZP

입자크기와 열처리 분위기 변화에 따른 Y-TZP에서의 상안정성 변화

  • Chung, Tai-Joo (School of Materials Science and Engineering, Andong National University) ;
  • Ahn, Seung-Su (Division of Research and Development, Korloy Inc.) ;
  • Song, Eun-Wha (School of Materials Science and Engineering, Andong National University) ;
  • Oh, Kyung-Sik (School of Materials Science and Engineering, Andong National University) ;
  • Lee, Jong-Sook (School of Materials Science and Engineering, Chonnam National University) ;
  • Kim, Young-Sik (School of Materials Science and Engineering, Andong National University)
  • Published : 2006.10.28
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Abstract

The phase stability of tetragonal phase in Y-TZP was investigated in terms of the distribution of grain sizes and heat-treating atmosphere. Y-TZP with various grain sizes were prepared using duration time at $1600^{\circ}C$ as experimental parameter. Accumulated grain size distributions were built from the SEM micrographs and the amount of tetragonal phase were measured using XRD. Both results were compared to determine the critical grain size before and after heat-treatment in vacuum. The critical grain size drastically decreased compared with the small increase of average grain size due to the autocatalytic effect which critically affects the tetragonal to monoclinic phase transformation. After heat-treatment in reductive atmosphere critical grain size relatively increased due to the stabilization of tetragonal phase. The formation of oxygen vacancies during heat-treatment was ascribed to the increase of stability.

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