昇温脱離法による各種黒鉛材料の吸蔵ガス量の測定

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From purpose of vacuum use of graphite and carbon as a plasma facing material in fusion devices, test samples made from these materials which are available in Japan are prepared and occluded gas amounts in these samples have been measured with thermal desorption method. At first total gas amounts evolved on heating as-received samples in a thermal bath with a linear ramp rate from room temperature to 1400°C have been measured. The gas amounts which are normalized with sample volume of 5 cm3, distribute in the range from 7.5 × 10-1 to 1.8 × 10-2 Torr l/cm3, depending on outgassing treatments for the materials by manufacturers. The lowest value for the gas amounts is obtained from among materials which are supplied after degassing in vacuum at 2000°C at makers. Secondarily some of samples after the first thermal desorption test have been subsequently exposed to air for 50 days and reabsorbed gas amounts in the samples have been also measured. A saturation on the gas recovering has been observed and the avarage saturated gas amount is nearly the same value with the lowest gas amount for as-received samples after the higher temperature degassing. Finally derivation of a formular to calculate internal surface area of graphite is discussed according to a modeling presented for pore structure of isotropic graphite and the measured gas amount for the graphite is expressed with another normalized quantity as trapped gas molecules per unit surface area.
日本真空協会の論文

昇温脱離法による各種黒鉛材料の吸蔵ガス量の測定

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