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1 1 000 Ni-Cr Tribological Characteristics of Ni-Cr Alloy at C in Air R&D Ni-Cr Ni-Cr alloy sliding tests in atmosphere at C were carried out and the process in which a glazed oxide layer was formed on the wear track was investigated. We have confirmed the formation of a glazed oxide layer through a detailed analysis of the surface and the cross-section of the wear track. Furthermore, the discharge of wear particles necessary for the formation of glazed oxide is promoted at C so that glazed oxide begins to form at a comparatively early stage, thereby showing excellent tribological characteristics. 1. 緒言 ( 1 ) ( 2 ) Ni-Cr ( 3 ) ( 4 ) 800 ( 3 ) ( 7 ) Ni-Cr 試験供試体 2. 試験方法 第 1 表 Ni-Cr mm f12 20 mm Ra 0.8 mm 試験装置 第 1 図 第 1 表 Ni-Cr Table 1 Main composition of Ni-Cr alloy mass Ni Cr C Al Ni-Cr IHI Vol.52 No.3 ( 2012 ) 79

2 1.0 ( a ) 第 1 図 Fig. 1 Schematic image of test rig 試験条件 11 N 3.3 mm/s 10 mm SEM ( Scanning Electron Microscope ) SEM WDS ( Wave Dispersive Spectroscopy ) EDS ( Energy Dispersive Spectroscopy ) WDS 3. 試験結果および考察 ( b ) 大気中の Ni-Cr 合金のトライボロジー特性第 2 図 Ni-Cr 第 2 図 - ( a ) 第 2 図 - ( b ) 第 3 図 mm 3. 2 試験後の摺動面の比較 SEM 第 4 図 2 第 4 図 - ( a ) 第 4 図 - ( d ) 100 第 4 図 - ( b ) 2 - ( a ) 第 4 図 - ( c ) - ( f ) ( b ) - ( e ) 第 4 図 - ( c ) 第 2 図 Ni-Cr Fig. 2 Friction coefficient of Ni-Cr alloy 80 IHI Vol.52 No.3 ( 2012 )

3 ( a ) ( b ) A A ( µm ) ( c ) ( d ) B 2.5 B 12.5 ( µm ) 第 3 図 mm Fig. 3 Profiles of sliding surfaces after cycles ( unit : mm ) ( a ) 2 ( b ) 100 ( c ) SEM ( d ) 2 ( e ) 100 ( f ) SEM 第 4 図 Fig. 4 Comparison of sliding surfaces after tests 3. 3 試験後摺動表面の詳細観察 100 第 5 図 第 6 図 第 5 図 - ( a ) 第 4 図 - ( b ) 第 6 図 - ( a ) 第 4 図 - ( e ) SEM ( Ni ) ( Cr ) IHI Vol.52 No.3 ( 2012 ) 81

4 ( a ) SEM 4 - ( b ) ( b ) 第 5 図 Fig. 5 Element distribution on the sliding surface of a plate specimen ( a ) SEM 4 - ( e ) ( b ) 第 6 図 Fig. 6 Element distribution on the sliding surface of a cylinder specimen ( Al ) 3. 4 摺動面と非摺動面の比較 100 第 5 図 - ( a ) SEM 第 7 図 ( 5 ) ( 6 ) Ni-Cr 第 7 図 - ( a ) SEM nm ( 7 ) 750 Ni-Cr Co-Cr 5 15 nm ( a ) 5 ( a ) ( b ) 5 µm 5 µm 第 7 図 100 Fig. 7 Sliding and non sliding surface after 100 cycles 82 IHI Vol.52 No.3 ( 2012 )

5 3. 5 摺動部の断面の詳細観察第 8 図 第 9 図 SEM 第 10 図 SEM 2.3 mm 7.9 mm ( a ) SEM ( b ) 第 8 図 Fig. 8 Element distribution on the cross-sectional sliding surface of a plate specimen ( a ) SEM ( b ) 第 9 図 Fig. 9 Element distribution on the cross-sectional sliding surface of a cylinder specimen ( a ) SEM ( b ) 第 10 図 Fig. 10 Element distribution on the non sliding surface of a cylinder specimen IHI Vol.52 No.3 ( 2012 ) 83

6 大気中における Ni-Cr 合金のグレーズ酸化膜の形成機構の特徴 Ni-Cr Ni-Cr 結言 Ni-Cr 参考文献 ( 1 ) RHV4 ( STEP4 ) IHI pp ( 2 ) MSCoating IHI pp ( 3 ) F. H. Stott : High-temperature sliding wear of metals Tribology International Vol. 35 No. 8 ( ) pp ( 4 ) F. H. Stott and G. C. Wood : The influence of oxides on the friction and wear of alloys Tribology International Vol. 11 No. 4 ( ) pp ( 5 ) Ni-Cr Vol. 28 No pp ( 6 ) A. Pauschitz, Manish Roy and F. Franek : Mechanisms of sliding wear of metals and alloys at elevated temperatures Tribology International Vol. 41 No. 7 ( ) pp ( 7 ) I. A. Inman, S. Datta, H. L. Du, J. S. Burnell- Gray and Q. Luo : Microscopy of glazed layers formed during high temperature sliding wear at 750 C Wear Vol. 254 No. 5 6 ( ) pp IHI Vol.52 No.3 ( 2012 )

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