Influence of Silver Contents on the Tribological Properties of Ni-Based Self-Lubricating Coatings by Atmospheric Plasma Spraying

doi:10.1007/s40195-017-0573-8

Abstract

Abstract:

The NiCrAlY-Mo-Ag composite coatings were prepared by atmospheric plasma spraying. The tribological properties of the composite coatings were investigated from 25 to 900 °C in details. The tribo-layer formed on the worn surface of the composite coatings and influenced the tribological properties at different temperatures. The addition of silver could effectively decrease the friction coefficient and wear rate of the coatings at the wide range of temperature. The rubbing process could form the nickel molybdate and promote the formation of silver molybdate within the worn surfaces at high temperature. The synergistic lubricating effects of nickel molybdate and silver molybdate are attributed to the improvement of the tribological properties of coatings at high temperature.

Key words: Plasma spraying, Tribological properties, Synergistic lubricating, High temperature

Bo Li, Jun-Hong Jia, Yi-Min Gao, Hong-Jian Guo, Min-Min Han, Wen-Zhen Wang. Influence of Silver Contents on the Tribological Properties of Ni-Based Self-Lubricating Coatings by Atmospheric Plasma Spraying[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(8): 801-808.

Figures/Tables 13

Table 1 Composition of the coatings

Composite coatings	NiCrAlY (wt%)	Mo (wt%)	Ag (wt%)
NMA	100	0	0
NMA0	90	10	0
NMA1	80	10	10
NMA2	75	10	15
NMA3	70	10	20

Fig. 1 SEM images of NiCrAlY a, Mo b, Ag c, NiAl d

Fig. 2 XRD patterns of the coatings

Fig. 3 Micrographs of polished cross section of NMA a, NMA1 b, NMA3 c coatings

Table 2 Vickers hardness of the composite coatings

Composite coatings	NMA	NMA0	NMA1	NMA2	NMA3
Vickers hardness (HV)	329.8 ± 31.6	342.5 ± 34.5	297.4 ± 30.2	273.9 ± 28.6	241.1 ± 23.9

Fig. 4 Adhesive strength of the composite coatings

Fig. 5 Friction coefficients of the composite coatings at different test temperatures

Fig. 6 Wear rates of the composite coatings at different test temperatures

Fig. 7 SEM images of worn surfaces of composite coatings: a-d NMA0 coating, e-h NMA1 coating, i-l NMA3 coating

Fig. 8 XRD patterns of worn surfaces of NMA3 composite coating at different temperatures: a 25 °C, b 300 °C, c 500 °C, d 700 °C, e 900 °C

Fig. 9 Micro-Raman spectra of worn surfaces of NMA1 composite coatings tested at a 700 °C, b 900 °C

Fig. 10 Micro-Raman spectra of worn surfaces of NMA3 composite coatings tested at a 700 °C, b 900 °C

Fig. 11 Micro-Raman spectra of within the wear track of NMA3 composite coatings tested at different temperatures

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