Japan Geoscience Union Meeting 2015

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Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG57] Structure, evolution and dynamics of mobile belts

Wed. May 27, 2015 2:15 PM - 4:00 PM A06 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Toru Takeshita(Department of Natural History Sciences, Graduate School of Science, Hokkaido University), Hiroshi Sato(Earthquake Prediction Research Center, Earthquake Research Institute, The University of Tokyo), Koichiro Obana(Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology), Takuya NISHIMURA(Disaster Prevention Research Institute, Kyoto University), Yukitoshi Fukahata(Disaster Prevention Research Institute, Kyoto University), Aitaro Kato(Graduate School of Environmental Studies, Nagoya University), Jun Muto(Department of Earth Sciences, Tohoku University), Katsushi Sato(Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University), Shuichi Kodaira(Institute for Research on Earth Evolution Japan Agency for Marine-Earth Science and Technology), Takeshi Sagiya(Disaster Mitigation Research Center, Nagoya University), Tatsuya Ishiyama(Earthquake Research Institute, University of Tokyo), Makoto MATSUBARA(National Research Institute for Earth Science and Disaster Prevention), Yasutaka Ikeda(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Chair:Eiji Kurashimo(Earthquake Research Institute, the University of Tokyo)

3:45 PM - 3:48 PM

[SCG57-P08] Grain growth in sintered polycrystalline diopside

3-min talk in an oral session

*Yumiko TSUBOKAWA1, Masahiro ISHIKAWA1 (1.Yokohama National Univercity)

Keywords:grain growth, sintering, diopside, polycrystalline

Grain growth kinetics were studied in sintered polycrystalline diopside. The starting material was prepared from two types of diopside single crystals (Ⅰ:Ca0.99Na0.01Mg0.97Fe0.03Si2O6, Ⅱ:Ca0.97Na0.02Mg0.86Fe0.13Si2O6). They were crushed and milled to particle size of <1μm. The powders were pressed into cylindrical shape under a uni-axial pressure of 2.0 MPa for 10 minutes. The pellets were then sintered at 1130 - 1280 ℃ for 2h and 6h. As a result, grain size increased and the porosity decreased with increasing sintering temperature or sintering time. The experimental data can be fit the following relation, Dfn – D0n = kt where n is a constant, Df and D0 are the grain size at time t = t and t = 0 respectively, and k is a rate constant. For the sintered polycrystalline diopside, the parameter log10k (μmn/s) was determined to be -3.3 or -4.8 for n = 2.59 or 2.64 respectively.