並列タイトル等Evaluation of chromic oxide layer for SUS440C bearing
タイトル（掲載誌）宇宙航空研究開発機構特別資料: 平成16年度総合技術研究本部宇宙領域宇宙科学研究本部合同研究成果報告書:宇宙輸送系基盤技術 = JAXA Special Publication: FY2004 Report of Joint Research Achievements of the Space Division of Institute of Aerospace Technology and Institute of Space and Astronautical Science: Basic Technologies of Space Transportation Systems
一般注記出版タイプ： NA
In order to realize Liquid Oxygen (LO2)/Liquid Hydrogen (LH2) pump-fed rocket engines characterized by high durability, the cryogenic high-speed bearings used in the turbopumps must have high wear-resistance. These bearings made of SUS440C were self-lubricated with a glass cloth-reinforced PTFE retainer. In a previous study, the bearing exhibited excellent durability in at a speed of 50,000 rpm. XPS analysis indicated the intense formation of a chromic oxide (Cr2O3) layer (thickness, about 15 nm) beneath an extremely thin transferred lubricant-film. To reduce the bearing wear, the pre-formation of a thick Cr2O3 layer, which restrained metal-to-metal adhesion, seemed to be effective, because the untreated bearing had an extremely thin native Cr2O3 layer (about 2.5 nm). The purpose of this study is to evaluate the Cr2O3 layer chemically formed on the SUS440C ball. These results showed that a considerably thick Cr2O3 layer on a SUS440C surface was successfully formed by heat treatment at a low concentration of oxygen. Friction and wear of the Cr2O3 layer chemically formed was found to be better than that of the untreated ball in LN2.
資料番号: AA0049056010
レポート番号: JAXA-SP-05-010
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
提供元機関・データベース宇宙航空研究開発機構 : 宇宙航空研究開発機構リポジトリ