1 000 Ni-Cr Tribological Characteristics of Ni-Cr Alloy at 1 000 C in Air R&D 1 000 Ni-Cr 1 000 Ni-Cr alloy sliding tests in atmosphere at 1 000 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 1 000 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 200 800 ( 3 ) ( 4 ) 800 ( 3 ) ( 7 ) 1 000 Ni-Cr 1 000 2. 1 試験供試体 2. 試験方法 第 1 表 Ni-Cr 12 35 6 mm f12 20 mm Ra 0.8 mm 5 2. 2 試験装置 第 1 図 1 200 第 1 表 Ni-Cr Table 1 Main composition of Ni-Cr alloy mass Ni Cr C Al Ni-Cr 72.4 13.6 0.09 6.0 IHI Vol.52 No.3 ( 2012 ) 79
1.0 ( a ) 100 2 100 1 000 0.8 第 1 図 Fig. 1 Schematic image of test rig 0.6 0.4 0.2 2. 3 試験条件 11 N 3.3 mm/s 10 mm 1 000 2 100 1 000 SEM ( Scanning Electron Microscope ) SEM WDS ( Wave Dispersive Spectroscopy ) EDS ( Energy Dispersive Spectroscopy ) WDS 3. 試験結果および考察 0.0 0 20 40 60 80 100 1.0 0.8 0.6 0.4 0.2 ( b ) 1 000 2 100 1 000 0.0 0 200 400 600 800 1 000 3. 1 1 000 大気中の Ni-Cr 合金のトライボロジー特性第 2 図 Ni-Cr 10 0.66 0.34 100 0.45 第 2 図 - ( a ) 1 000 第 2 図 - ( b ) 10 10 1 000 第 3 図 1 000 20 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 ) 2 10 1 000 第 4 図 - ( c ) - ( f ) 100 - ( 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 )
( a ) ( b ) A A ( µm ) 21.85 16.48 11.11 5.74 0.38 12.5 12 4.99 10.36 15.73 21.10 ( c ) ( d ) B 2.5 B 12.5 ( µm ) 33.75 14.80 4.15 23.09 42.04 60.99 79.93 98.88 117.83 第 3 図 1 000 mm Fig. 3 Profiles of sliding surfaces after 1 000 cycles ( unit : mm ) ( a ) 2 ( b ) 100 ( c ) 1 000 SEM ( d ) 2 ( e ) 100 ( f ) 1 000 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
( a ) SEM 4 - ( b ) ( b ) 第 5 図 Fig. 5 Element distribution on the sliding surface of a plate specimen 1. 2. 100 ( a ) SEM 4 - ( e ) ( b ) 第 6 図 Fig. 6 Element distribution on the sliding surface of a cylinder specimen 1. 2. 100 ( 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 ) 800 1 000 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 )
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 ) 1. 2. 100 第 8 図 Fig. 8 Element distribution on the cross-sectional sliding surface of a plate specimen ( a ) SEM ( b ) 1. 2. 100 第 9 図 Fig. 9 Element distribution on the cross-sectional sliding surface of a cylinder specimen ( a ) SEM ( b ) 1. 2. 100 第 10 図 Fig. 10 Element distribution on the non sliding surface of a cylinder specimen IHI Vol.52 No.3 ( 2012 ) 83
3. 6 1 000 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 1 000 Ni-Cr 1 000 Ni-Cr 1 000 800 4. 結言 1 000 Ni-Cr 1 000 参考文献 ( 1 ) RHV4 ( STEP4 ) IHI 51 3 2011 9 pp. 48 53 ( 2 ) MSCoating IHI 49 4 2009 2 pp. 234 243 ( 3 ) F. H. Stott : High-temperature sliding wear of metals Tribology International Vol. 35 No. 8 ( 2002. 8 ) pp. 489 495 ( 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 ( 1978. 8 ) pp. 211 218 ( 5 ) Ni-Cr Vol. 28 No. 11 1983 11 pp. 845 852 ( 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 ( 2008.7 ) pp. 584 602 ( 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 ( 2003.3 ) pp. 461 467 84 IHI Vol.52 No.3 ( 2012 )