In-situ formation of layer-like Ag2MoO4 induced by high-temperature oxidation and its effect on the self-lubricating properties of NiCoCrAlYTa/Ag/Mo coatings

doi:10.1016/j.jmst.2020.10.024

Abstract

Abstract:

Ag-Mo-O ternary oxide has attracted growing attention because of its potential as a solid lubricant at high temperatures. This work designs and prepares NiCoCrAlYTa/Ag/Mo composite coating, performed using high velocity oxy-fuel (HVOF) spraying technology. The environment temperature plays an important role in the microstructure and phases as well as lubricant properties of NiCoCrAlYTa/Ag/Mo coatings. When the environment temperature is above 600 °C, the outer diffusion and oxidation of Ag and Mo lead to the formation of Ag₂MoO₄ on the coating surface. Layer-like Ag₂MoO₄ could form a continuous lubricant film at 800 °C and consequently let the composite coating present the best tribological properties. Meanwhile, a small number of hard particles could play a good bearing role during friction and improve the tribological properties of the composite coating. Download : Download high-res image (153KB)

Key words: Microstructure evolution, In-situ formation, Ag₂MoO₄, Layer-like structure, High-temperature friction

Enkang Hao, Yulong An, Jie Chen, Xiaoqin Zhao, Guoliang Hou, Jianmin Chen, Meizhen Gao, Fengyuan Yan. In-situ formation of layer-like Ag₂MoO₄ induced by high-temperature oxidation and its effect on the self-lubricating properties of NiCoCrAlYTa/Ag/Mo coatings[J]. J. Mater. Sci. Technol., 2021, 75: 164-173.

Figures/Tables 17

Fig. 1. Structure of the β-Ag2MoO4: ball-and-stick model (left) and polyhedral model (right).

Table 1 Optimized structure for β-Ag2MoO4 cubic spinel [32].

Atoms	Site	x	y	z
Fd3m(227); a =b = c = 9.318(5) Å; V = 809.01(7) Å³; Z = 8
Ag	.-3m	0.625	0.625	0.625
Mo	-43m	0	0	0
O	.3m	0.36	0.36	0.36

Table 2 Parameters of the composite powders.

Composite Powders	Chemical component	Size (μm)	Preparation craft	Content (wt.%)
Ag	99.99	≤60	gas atomization	10
Mo	≥99.5	30-75	Agglomerating and sintering	5
NiCoCrAlYTa	Ni-23Co-20Cr-8.5Al-0.6Y-4Ta	5-38	gas atomization	85

Table 3 Spraying parameters.

Parameters	Setting
Oxygen flow (m³/h)	18.5
Natural gas flow (m³/h)	11.3
Air flow (m³/h)	18.7
Powder feed rate (g/min)	25
Gun speed (mm/s)	800
Interpass spacing (mm)	3
Spraying distance (cm)	30
Substrate temperature (°C)	<150

Fig. 2. SEM images and XRD patterns of the as-received powders: NiCoCrAlYTa (a, d), Ag (b, e) and Mo (c, f).

Fig. 3. SEM image of the as-sprayed surface (a), SEM image and EDS spectra of polished surface (b), SEM image of cross-section (c) and XRD pattern (d) of the composite coating.

Fig. 4. Tribological performance (a) of the composite coating under different temperatures and its mechanical properties (b) after rubbing.

Fig. 5. XRD patterns of composite coating after rubbing under different temperatures: 25 °C, 200 °C and 400 °C (a); 600 °C, 800 °C and 1000 °C (b).

Fig. 6. EBSD observational results (IPF and phases maps) of the cross-section of the composite coating after rubbing under different temperatures: 25 °C (a, d), 800 °C (b, e) and 1000 °C (c, f).

Fig. 7. SEM images and EDS mappings of the non-worn surface of composite coating after rubbing under different temperatures: 600 °C (a, b); 800 °C (c, d).

Fig. 8. SEM images (a-c) of the non-worn surface of composite coating after rubbing under 1000 °C; TEM images and EDS mappings (d) of the cross-section of the region marked with red line in image (b); the enlargement of area A (e); HRTEM images of area A (f), area C (h) and area D (i) as well as diffracting pattern of area B (g) in image (d).

Table 4 EDS data in Fig. 8(b) and (c).

Samples	Items	O	Ni	Co	Cr	Al	Y	Ta	Ag	Mo
1	Weight %	30.45	18.16	3.75	8.11	2.71	0.00	0.55	25.18	11.09
1	Atomic %	65.98	10.72	2.21	5.40	3.49	0.00	0.11	8.09	4.01
2	Weight %	27.59	25.70	12.39	10.08	12.21	0.03	2.29	6.72	3.01
2	Atomic %	55.17	14.01	6.73	6.20	14.48	0.01	0.40	1.99	1.00

Fig. 9. SEM images of the worn surface of composite coating after sliding under different temperatures: 25 °C (a), 200 °C (b) and 400 °C (c).

Fig. 10. SEM images of the worn surface of composite coating after sliding under different temperatures: 600 °C (a), 800 °C (b) and 1000 °C (c).

Fig. 11. Raman spectra (a) of the worn surface of composite coating after sliding under different temperatures and Raman mappings (b) of the regions blocked with yellow dotted line in Fig. 10.

Fig. 12. TEM image (a), HRSEM and EDS mappings (b), HRTEM image (c) and diffracting pattern (d) of area A, HRTEM images of area B (e), area C (f) of the cross-section of worn track of the composite coating after rubbing under 800 °C.

Fig. 13. Schematic diagram of the in-situ formation of β-Ag2MoO4 cubic spinel and its lubrication mechanism.

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In-situ formation of layer-like Ag₂MoO₄ induced by high-temperature oxidation and its effect on the self-lubricating properties of NiCoCrAlYTa/Ag/Mo coatings

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