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Nakamura, Takafumi*; Yamamoto, Yukio*; Arakawa, Masakazu*; Maruyama, Akio*; Yoshigoe, Akitaka
Sangyo Oyo Kogakukai Rombunshi, 11(2), p.109 - 114, 2023/09
Surface chemistry experimental end-station at BL23SU in SPring-8 is widely used to study various surfaces and interfaces of functional materials by means of soft X-rays synchrotron radiation. To analyze surface chemical reactions between gas and solid surfaces, an accurate control of flow-rates of gases is essential. This paper describes a computerized automatic gas flow control system to improve the accuracy and reproducibility of gas-surface reaction experiments in the pressure range of ultra-high vacuum (molecular flow) conditions. The system uses feedback control to operate the slow-leak valve to control the gas-pressure. As a result, the system achieved results equivalent to those of a skilled experimenter.
species at SiO/Si interfaces in Si dry oxidation; Comparison between p-Si(001) and n-Si(001) surfacesTsuda, Yasutaka; Yoshigoe, Akitaka; Ogawa, Shuichi*; Sakamoto, Tetsuya*; Yamamoto, Yoshiki*; Yamamoto, Yukio*; Takakuwa, Yuji*
Journal of Chemical Physics, 157(23), p.234705_1 - 234705_21, 2022/12
Times Cited Count：0 Percentile：0.01(Chemistry, Physical)Wada, Yukio; Funasaka, Hideyuki; Myochin, Munetaka; Yamamoto, Kazunori; Harada, Hideo; ;
PNC TN8100 96-005, 16 Pages, 1996/01
no abstracts in English
Kato, Masato; Sakurai, Koji*; Kano, Yoshiharu*; Funasaka, Hideyuki; Yamamoto, Kazunori; *; Wada, Yukio
PNC TN8410 92-060, 7 Pages, 1992/03
None
Matsui, Hiroshi; Ikezawa, Yoshio; ; ; Onodera, Junichi; ; ; Yoshida, Yoshikazu*
7th Int. Congress of the IRPA, Radiation Protection Practice, Vol. 2, p.673 - 676, 1988/00
no abstracts in English
Yamamoto, Takenori*; Tojo, Takuya*; Kuroda, Masatoshi*; Sumita, Junya; Aihara, Jun; Tachibana, Yukio
no journal, ,
R&D on SiC/C mixed matrix fuel element of high temperature gas-cooled reactors (HTGRs) to improve oxidation resistance of fuel has been started. In this R&D, Young's modulus of fabricated SiC/C mixed matrix dummy fuel elements was measured. In addition, set of fabrication conditions of SiC/C mixed matrix dummy fuel elements was decided for modeling of relationship between fabrication condition and strength of fabricated SiC/C mixed matrix dummy fuel elements to estimate fabrication condition for SiC/C mixed matrix fuel elements with high strength.
Kuroda, Masatoshi*; Tojo, Takuya*; Yamamoto, Takenori*; Aihara, Jun; Tachibana, Yukio
no journal, ,
High temperature gas-cooled reactor (HTGR) is a fourth generation nuclear reactor with inherent safety. In recent years, fuel elements with oxidation resistance has been developed for use in HTGR. In order to maintain the structural integrity of the oxidation resistant fuel element under accident conditions, a technique to fabricate a high-strength fuel should be required. In the present study, hot pressing conditions have been considered as the parameters which affect the strength of the oxidation resistant fuel compact, and a model has been created to predict the strength of the fuel compact from the hot pressing conditions by applying statistical approaches. The hot pressing conditions which can fabricate the high-strength oxidation resistant fuel element were also predicted by the model.
Tojo, Takuya*; Yamamoto, Takenori*; Kuroda, Masatoshi*; Aihara, Jun; Tachibana, Yukio
no journal, ,
Fuel compact of high-temperature gas-cooled reactor (HTGR) with inherent safety employs fuel component which was molded from graphite. Development of oxidation-resistant fuel component has been advancing at present, which is fuel component having oxidation resistance formed by SiC. In this study, mechanical properties were obtained on oxidation-resistant fuel components prepared under various molding parameters. Young's modulus was measured by ultrasonic pulse velocity test, and compressive strength was measured by compression test. High correlation was not observed between Young's modulus and hot pressing conditions of temperature and time. There was no correlation between compressive strength and hot pressing time in range of hot pressing temperature of 1573-1873 K and time of 40-120 min, but high negative correlation was observed within range of hot pressing temperatures. Therefore, it was predicted that compressive strength was increased by decreasing hot pressing temperature.
Ajikawa, Yusuke*; Yamamoto, Yukio*; Yoshida, Hikaru; Yoshigoe, Akitaka
no journal, ,
A very small amount of gas control was indispensable for surface reaction experiments under ultrahigh vacuum conditions. Normally, it has been performed with a variable leak valve by the manual operation. However, the manual operation can not apply for advanced experiments such as multi-measurements. The automatic precise valve control would lead to the burden reduction and reproducible improvement. The antomatic control also has a metrit to avid the loss of control for the apparatus. In this conference, we will report recent developments of the automatic pressure control system and some results of precise pressure control from 10
to 10
Pa.
/Si(001) interfacial oxidationTsuda, Yasutaka; Ogawa, Shuichi*; Yoshigoe, Akitaka; Tominaga, Aki; Sakamoto, Tetsuya; Yamamoto, Yoshiki*; Yamamoto, Yukio*; Takakuwa, Yuji*
no journal, ,
no abstracts in English
species at SiO/Si interfaces in Si dry oxidationTsuda, Yasutaka; Yoshigoe, Akitaka; Ogawa, Shuichi*; Sakamoto, Tetsuya*; Yamamoto, Yoshiki*; Yamamoto, Yukio*; Takakuwa, Yuji*
no journal, ,
no abstracts in English
