日時 ： ２００９年１月２３日（金）17：00〜
場所 ： 愛媛大学理学部講義棟 １０１教室
要 旨
Pyrophyllite is widely used both as the gasket material and as the pressure transmitting medium, especially for the large volume press. In my Master course study, we found that the pressure-transmitting efficiency of pyrophyllite is improved by change density and strength of the pyrophyllite. The results showed that pyrophyllite was fully densified when the pressure reached to about 1 GPa. On the hinge-cage cubic press, the press load for Ba I-II transition (5.5GPa) in the cubic large volume pressure cell is reduced more than 8 × 105 N by using the densified pyrophyllite, compared with the unprecompresssd pyrophyllite. We report that the cell pressure versus press load still keeps good linearity at cell pressures up to 5.5 GPa, and the press load utilization efficiency is improved above 15% for the cubic press system when the precompressed pyrophyllite is used as the pressure-transmitting medium and gasket material. We also analyzed the forming of gasket by Bridgman high-pressure principles. The analysis of gasket shows that the formed gasket determines pressure-transmitting efficiency of pressure-transmitting medium, and the pressure gradient of gasket decides the pressure plateau.
問い合わせ先：土屋 卓久 TEL （089）927-8198
E-mail takut@sci.ehime-u.ac.jp
