1 0 0 0 OA 民間航空機用エンジンの使用済みタービンブレードにおける内部クラック分布と組織変化の観察
- 著者
- 木村 智人 鈴木 崇宣 小泉 裕 横川 忠晴 原田 広史 今井 八郎
- 出版者
- 公益社団法人 日本金属学会
- 雑誌
- 日本金属学会誌 (ISSN:00214876)
- 巻号頁・発行日
- vol.71, no.11, pp.1041-1045, 2007 (Released:2007-11-02)
- 参考文献数
- 4
- 被引用文献数
- 8 9
A post service examination of a turbine blade from a civil aeroengine has been carried out to ascertain the degree of microstructural coarsening and the distribution of crack damage induced during service. This was with the purpose to elucidate their correlation with the actual operating conditions. Samples were sectioned from different parts of the turbine blade for detailed examination by optical microscope and scanning electron microscope. The average length of cracks was used as one of the parameters to quantitatively illustrate the distribution of cracks on the turbine blade. Experimental results suggested that cracks were mainly concentrated on certain area of the pressure side. Leading edge of the suction side of the turbine blade consisted of mostly coarsened microstructure due to higher temperature exposure. In conclusions, there was no clear correlation between the crack damage distribution and the degree of microstructure evolution.
1 0 0 0 OA 貴金属被覆チタン電極を用いた次亜塩素酸およびオゾンの生成とその殺菌効果
- 著者
- 近藤 康人 小泉 ゆりか 井関 正博 山田 淳 高岡 大造 滝沢 貴久男 安田 昌司 今井 八郎
- 出版者
- 一般社団法人 表面技術協会
- 雑誌
- 表面技術 (ISSN:09151869)
- 巻号頁・発行日
- vol.56, no.2, pp.106, 2005 (Released:2005-10-19)
- 参考文献数
- 29
- 被引用文献数
- 3 2
A Ti electrode with a noble metal coating was used for sterilization of water. The main product from electrolysis for sterilization is hypochlorite acid. It was found that the hypochlorite acid production rate was consistently higher on Pt-Ir and Pt-Ir-Ta coated Ti electrodes, compared to Pt coated Ti electrodes. The production rate of hypochlorite was independent of temperature. Therefore, it was thought that this hypochlorite would be effective in sterilization of hot bath water and pool water. At the same time, ozone was generated in the electrolyte water. Generation of ozone was conspicuously observed under electrolysis of Pt electrodes. The production rate of ozone depended on the temperature and the concentration of chloride ions in the electrolyte. A high concentration of ozone was observed when the temperature of the solution was below about 15ºC, concentration of chloride ions was 1mM, and a membrane was used to separate the cell. The ozone generated by electrolysis of Pt coated Ti electrodes had a significant effect on sterilization for Bacillus subtilis spores.