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Chinese Journal of Materials Research  2014, Vol. 28 Issue (7): 490-496    DOI: 10.11901/1005.3093.2014.019
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Effect of Co Content on Tribological Behavior of Ni-Co-Al P/M Superalloy
Chenglai XIN1,2,Wenzhen WANG1,**(),Qin MA2,Hongjian GUO1
1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000
2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050
Cite this article: 

Chenglai XIN,Wenzhen WANG,Qin MA,Hongjian GUO. Effect of Co Content on Tribological Behavior of Ni-Co-Al P/M Superalloy. Chinese Journal of Materials Research, 2014, 28(7): 490-496.

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Abstract  

Ni-Co-Al high temperature alloys with different Co content were prepared by powder metallurgy (mechanical alloying and hot-press sintering), of which the high temperature tribological properties were investigated at 800℃. The results showed that the hardness and compressive strength, as well as the tribological properties of alloys could be improved with a Co addition in a range from 5-30 mass%, among which 20 mass% is the optimal. The observation of worn surfaces by SEM, XPS and EDS revealed that a “glaze-like film” consisted of CoO and other oxides existed on the worn surface. The high temperature tribological properties of the alloys are highly related with the composition and the spallation tendency of the formed glaze film during the friction and wear process.

Key words:  metallic materials      P/M superalloy      tribological behavior      oxide     
Received:  18 January 2014     
Fund: *Supported by National Natural Science Foundation of China No. 51101166.

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2014.019     OR     https://www.cjmr.org/EN/Y2014/V28/I7/490

Specimens Composition (mass fraction) Ball-milling periods/h Hot-pressing temperature/℃ Density/gcm-3
NA Ni-5%Al 20 1200 7.79
NAC5 Ni-5%Al-5%Co 30 1200 7.78
NAC10 Ni-5%Al-10%Co 60 1200 7.73
NAC20 Ni-5%Al-20%Co 60 1200 7.77
NAC30 Ni-5%Al-30%Co 60 1200 7.81
表1  合金的成分和球磨、热压烧结主要参数及烧结试样的密度
Fig.1  XRD spectra of mixed powder with different Co contents after ball-milling
Fig.2  XRD spectra of sintered specimens with different Co contents
Fig.3  SEM images of alloys after electrolytic corrosion (a) NA, (b) NAC10, (c) NAC20
Fig.4  Variations of hardness and compressive strength with Co content of alloys
Fig.5  Variations of friction coefficient and wear rate of alloys with Co contents at 800℃
Fig.6  Variations of friction coefficient with time at 800℃
Fig.7  SEM images of wear surfaces of alloys (a) NA, (b) NAC5, (c) NAC20, (d) NAC30
Fig.8  XPS patterns of elements of worn surface of NAC20
Materials 400F(204℃) 600F(316℃) 1100F (593℃)
CoO 0.46 0.38 0.18
NiO 0.70 - 0.69
Al2O3 0.77 - -
表2  Frictional coeffcients of single oxide(matched with stainless steel)
Sample Ni2p3/2 Co2p3/2 Al2p
Ni0 Ni3Al NiO NiAl2O4 Co0 CoO CoAl2O4 Co3O4 Al0 Ni3Al Al2O3 CoAl2O4 NiAl2O4
BE / eV 852.5 852.65 854.0 856.0 778.1 780.1 781.7 780.5 71.7 72.4 74.3 74.5 74.5
References [17,22] [18] [17,22] [19,22] [20] [20] [20,23] [20] [21] [22] [22] [23] [22]
Table 3  Comparison table of Binding energy
Specimens Ni Co Al
NA 95.37 0 4.63
NAC5 91.28 4.95 3.77
NAC10 85.14 11.30 3.57
NAC20 71.82 25.01 3.17
NAC30 56.28 40.20 3.53
Table 4  Elements content of wore surfaces of alloys after 800℃ (%, mass fraction)
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