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RISS 인기검색어
- 검색키워드
- 저자 : Motozo Hayakawa (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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The Morphology and Crystallography of Isothermal Martensite in Yttria Stabilized Zirconia
피재환,Eui-Seok Choi,Motozo Hayakawa 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.2
A full retention of the tetragonal phase with coarse grains (50~60μm) was possible with the specimen ZrO2-1.9mol% Y2O3. In these coarse grains, {101}t annealing twins were frequently observed, although they do not exist in the usual fine grained specimens. The morphology and growth rate of the isothermally formed individual products are studied at an optical microscopic level. The habit planes of both products are also identified by performing two-surface trace analysis on the grains whose orientations are determined by the electron back scattering pattern (EBSP) method. The morphologies of isothermal martensite were well-defined thin plates and lenticular types. The growth rate in their longitudinal directions was quite slow and temperature-dependent. A two-surface trace analysis, incorporated with the EBSP method, identified the habit planes near {013}c in agreement with previous reports obtained from TEM works.
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Kinetics of Athermal Martensitic Transformation in Yttria Doped Zirconia
피재환,Eui-Seok Choi,Motozo Hayakawa 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.11
The high temperature tetragonal phase of zirconia containing 1.40~1.60mol% of yttria can be fully retained at room temperature by rapid cooling. The metastable tetragonal phase transforms into the monoclinic phase athermally upon subzero cooling. The transformation exhibited an athermal burst transformation. The effects of yttria content and grain size on the athermal martensitic transformation were studied in detail. The burst temperature linearly decreased with increasing yttria content or decreasing grain size. To consider the distribution of martensite nuclei, the Weibull modulus of the athermal martensitic transformation was evaluated from the distribution of the burst transformation temperature. From the Weibull analysis, the distribution of embryos appears to be more homogeneous than that of the defects responsible for the fracture of similar material.
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Kinetics of Athermal Martensitic Transformation in Yttria Doped Zirconia
Pee, Jae-Hwan,Choi, Eui-Seok,Hayakawa, Motozo The Korean Ceramic Society 2005 한국세라믹학회지 Vol.42 No.11
The high temperature tetragonal phase of zirconia containing $1.40{\~}1.60\;mol\%$ of yttria can be fully retained at room temperature by rapid cooling. The metastable tetragonal phase transforms into the monoclinic phase athermally upon subzero cooling. The transformation exhibited an athermal burst transformation. The effects of yttria content and grain size on the athermal martensitic transformation were studied in detail. The burst temperature linearly decreased with increasing yttria content or decreasing grain size. To consider the distribution of martensite nuclei, the Weibull modulus of the athermal martensitic transformation was evaluated from the distribution of the burst transformation temperature. From the Weibull analysis, the distribution of embryos appears to be more homogeneous than that of the defects responsible for the fracture of similar material.
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The Morphology and Crystallography of Isothermal Martensite in Yttria Stabilized Zirconia
Pee, Jae-Hwan,Choi, Eui-Seok,Hayakawa, Motozo The Korean Ceramic Society 2006 한국세라믹학회지 Vol.43 No.2
A full retention of the tetragonal phase with coarse grains $(50\~60\;{\mu}m)$ was possible with the specimen $ZrO_2-1.9\;mol\%\;Y_2O_3$. In these coarse grains, $\{101\}_t$ annealing twins were frequently observed, although they do not exist in the usual fine grained specimens. The morphology and growth rate of the isothermally formed individual products are studied at an optical microscopic level. The habit planes of both products are also identified by performing two-surface trace analysis on the grains whose orientations are determined by the Electron Back Scattering Pattern (EBSP) method. The morphologies of isothermal martensite were well-defined thin plates and lenticular types. The growth rate in their longitudinal directions was quite slow and temperature-dependent. A two-surface trace analysis, incorporated with the EBSP method, identified the habit planes near $\{013\}_c$, in agreement with previous reports obtained from TEM works.
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Y-TZP의 燒結性 및 相 安定性에 대한 CuO添加의 影響
皮在煥(Jae-Hwan Pee),金允海(Yun-Hae Kim),早川元造(Hayakawa Motozo) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.2
Effects of CuO addition on the sintering ability and the phase stability of Y-TZP (Yttria doped Tetragonal Zirconia Polycrystals) were studied. The CuO dopants were found to be quite effective in reducing the sintering temperature to obtain full density and refining the grain size. The maximum allowable concentration of the dopants was limited to 0.3㏖% for CuO to maintain fully tetragonal phase. With the addition of these dopants, the flexual strength decreased by 20% in comparison with the undoped specimen but the fracture toughness increased by 15%.
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