Gas Desorption Property of Inner Coating Graphite Used for Cathode Ray Tube. Effect of exposure to the atmosphere after baking in the atmosphere

Autor:	Tomoaki Hino, Hiroshi Shinbori, Sadao Deyama, Yuko Hirohata, Masao Hashiba
Rok vydání:	2001
Předmět:	Chemistry Vapor pressure Thermal desorption spectroscopy Vapour pressure of water Thermal desorption Analytical chemistry food and beverages Condensed Matter Physics Cathode Surfaces Coatings and Films law.invention Atmosphere law Desorption Graphite Electrical and Electronic Engineering
Zdroj:	SHINKU. 44:592-597
ISSN:	1880-9413 0559-8516
DOI:	10.3131/jvsj.44.592
Popis:	For inner coating graphite baked in the atmosphere, gas desorption properties after exposure to the atmosphere were investigiated by using a thermal desorption spectroscopy. The temperature and the water vapor pressure during the exposure were varied from 25 to 50°C, and from 950 Pa to 6150 Pa, respectively. In the heating up to 410°C, the major gas species desorbed were CO2 and H2O. In the thermal desorption spectra of CO2and H2O, a desorption peak was observed at around 130°C. The peak intensities decreased with increases of both the exposure temperature and the water vapor pressure. When the water vapor pressure increased, the desorption amount of H2O increased, although that of CO2 decreased. The total desorption amount was almost the same even when the water vapor pressure was changed. In order to lengthen a life time of a cathode ray tube, it is necessary to reduce the water vapor pressure in the atmosphere environment, since the cathode is damaged by mainly the water.
Databáze:	OpenAIRE
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