| Co-Investigator(Kenkyū-buntansha) |
KANAGAWA Kyuichi Chiba Univ., Faculty of Science, Associate Professor, 理学部, 助教授 (40185898)
ANDO Junichi Hiroshima Univ., Graduate School of Science, Assistant Professor, 大学院・理学研究科, 助手 (50291480)
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| Research Abstract |
This research aided by the Monbukagakushou research grant is an experimental research using a high-pressure and high-temperature deformation apparatus built by Sumitomo Heavy Industries, Ltd. Since we introduced this machine at Hiroshima University in March, 2000, we have been working on preliminary experiments for 2 years, and obtained the following results.
1. In order to generate homogeneous confining pressure in the sample assembly (diameter of 23 mm and height of 30 mm), lead is placed on the top of it. However, the lead is squeezed into the hole, where a thermocouple goes through, and sometimes cut it during the experiments. Therefore, we replaced a part of the lead by pyrophyllite to solve the problem.
2. We have succeeded to choose an effective thickness of a graphite ring, by which the sample can be heated above 1000 ℃.
3. We first tried to measure confining pressure in the sample assembly with silver (Ag) using its well-known melting P-T relation. However, since sodium chloride, which is used for confining pressure medium, melts at lower temperatures than silver under relatively low confining pressure conditions less than 1 GPa, it is hard to control to increase the temperature to the melting point of silver. Therefore, confining pressure has been measured using the melting P-T curve of sodium chloride.
4. A problem of breaking of tungsten carbide confining pressure pistons remains to be solved in the future experiments.
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