Tribological Behavior of TiAl-Multilayer Graphene-Ag Composites at Different Temperatures and Sliding Speeds

doi:10.1007/s40195-017-0533-3

Abstract

Abstract:

Tribological behavior of TiAl-multilayer graphene-Ag composites (TMACs) prepared by spark plasma sintering against a Si3N4 ball was investigated on a ball-on-disk high-temperature tribometer at different test temperatures and sliding speeds in this study. The test results showed that TMACs had the lower friction coefficient and less wear rate at 450 °C-0.25 m/s, which was attributed to the formation of the high-strength and intact tribofilms on worn surface. At 450 °C-0.25 m/s, during the sliding process, multilayer graphene (MLG) was ground out to form the high-strength skeletons on the worn surface of TMACs. Ag was migrated from the worn surface and combined with the MLG skeleton to form the high-strength and intact tribofilms. The high-strength and intact tribofilms were beneficial to lowering the friction coefficient for the lubricating effect of Ag and decreasing wear rate for the enhancing effect of MLG skeleton.

Key words: Solid lubricant additives, Self-lubricating composites, Self-lubricated, Wear

Jia-Liang Zou,Xiao-Liang Shi,Qiao Shen,Kang Yang,Yu-Chun Huang,Ao Zhang,Yu-Fu Wang,Qiao-Xin Zhang. Tribological Behavior of TiAl-Multilayer Graphene-Ag Composites at Different Temperatures and Sliding Speeds[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(3): 193-200.

Figures/Tables 8

Fig. 1 XRD pattern of TMACs

Fig. 2 Microstructure and elemental distributions of TMACs

Fig. 3 FESEM morphologies of cross-section surface of TMACs a and high magnification b of the area marked by rectangle in a

Fig. 4 Dynamic friction coefficient curves a and mean friction coefficients b of TMACs under different conditions

Fig. 5 Wear rates of TMACs under different conditions

Fig. 6 Typical EPMA micrographs of worn surfaces obtained after 80-min tests at 25 °C-0.10 m/s a, 150 °C-0.15 m/s b, 300 °C-0.20 m/s c, 450 °C-0.25 m/s d, 600 °C-0.30 m/s e

Fig. 7 EDS analysis results of worn surfaces obtained after 80-min tests at 25 °C-0.10 m/s a, 150 °C-0.15 m/s b, 300 °C-0.20 m/s c, 450 °C-0.25 m/s d, 600 °C-0.3 m/s e

Fig. 9 Cross section of worn scar a and diagram of tribofilms b on the worn surface at 450 °C-0.25 m/s-12 N

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