A Universal Environmental Cell for a 3MV-Class Electron Microscope and Its Applications to Metallurgical Subjects

概要

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A universal closed-type environmental cell, which can be used in the temperature range 100°-10O0°, has been developed for a 3 MV-class electron microscope. The pressure of the atmosphere in the cell can be increased up to about 2 kg/cm^2. The cell has been used in the voltage range 1〜2 MV to investigate some of the fundamental metallurgical problems with the following results. 1) Image contrast of a specimen in the cell whose gas layer is about 100 μm in thickness increases remarkably at 2MV. 2) The specimen damage of metal powders during observation, which is due to evaporation and melting, decreases with increasing convection of the atmosphere and increasing heat-conductivity of supporting films. 3) The specimen damage of surface-active powders, such as carbon black, is most sensitive to the partial pressure of oxygen in the atmosphere. 4) Pressurized atmosphere is effectively used for the suppression of evaporation of metal specimens at high temperatures and for studying chemical reactions between wet H_2-gas and metals.
社団法人応用物理学会の論文
1976-11-05