| KONG Xuan,CHEN Ming-hui,ZHANG Tao,WANG Fu-hui.Effect of Doping Ti on the Tribological Properties of Ni-based Composites[J],52(1):63-71 |
| Effect of Doping Ti on the Tribological Properties of Ni-based Composites |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.01.007 |
| KeyWord:Ni-based self-lubricating composites modification friction environment lubricity wear resistance |
| Author | Institution |
| KONG Xuan |
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang , China |
| CHEN Ming-hui |
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang , China |
| ZHANG Tao |
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang , China |
| WANG Fu-hui |
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang , China |
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| Abstract: |
| To improve tribological properties of self-lubricating composites in different environments, nano-Ti powders were doped into NiCr-WS2. Then, spark plasma sintering (SPS) was used to prepare NiCr (N), NiCr-WS2 (NW), NiCr-WS2-Ti (NW15T) composites. In this study, SEM and EDS were utilized to analyze the microstructure of materials. Meanwhile, the tribological properties of materials at dry friction, deionized water, 3.5wt.% NaCl solution, were tested by MFT-5000 tribometer with reciprocating motion at room temperature. Besides, Raman spectra of the wear tracks were recorded by a Raman spectrometer system. Due to better mechanical properties and TiS, NW15T exhibited good tribological properties during dry friction, and the results show that friction coefficient and wear rate of NW15T are 0.38 and 4.2×10‒5 mm3/(N.m) at dry friction condition. For NW, due to the poor interfacial bonding strength between CrS and the substrate, cracks are easily initiated at the interface during the friction process. At the same time, the uniformly dispersed CrS promotes the crack propagation, resulting in the wear rate of NW as high as 25.7×10‒5 mm3/(N.m) at dry friction condition. Compared with NW, the friction coefficient and wear rate of NW15T reduced by 22.4% and 83.7%, respectively. Different from dry friction, owing to the good lubrication of water all materials exhibited excellent tribological properties when sliding in water. Furthermore, the frictional heat is easily dissipated in water, so that no obvious cracks and spalling pits were seen on the surface of materials after sliding in water. However, there are obvious grooves on the surfaces of materials, which means the wear mechanism of materials is abrasive wear when they sliding in water. Nonetheless, NW15T exhibits better tribological performance in deionized water than N and NW. It is worth noting that the friction coefficient and wear rate of NW15T are only 0.16 and 0.4×10‒5 mm3/(N.m) when sliding in NaCl solution, due to the fact that the corrosion products of NW15T avoid direct contact for the friction pair. Compared with NW, the friction coefficient and wear rate of NW15T in 3.5wt.% NaCl solution are reduced by 38.5% and 81.8%, respectively. Furthermore, the wear of coupled ball of NW15T is much smaller than that of N and NW. In order to study the wear mechanism of NW15T in more detail, Raman be used to analyze the corrosion products of NW15T. It is found that the main corrosion products of NW15T are not only contain NiO and Cr2O3 but also TiO2. This is because NW15T has a large area of TiS, and the Ti rich area is easily corroded in NaCl solution to form TiO2. These corrosion products are easily transferred to the counter balls during sliding, thereby reducing the friction coefficient and wear rate of NW15T. In summary, nano Ti powders were added to NW, and lead to formation of TiS and Ni3Ti, which promotes the improvement of lubrication and wear resistance. Especially in NaCl solution, the friction coefficient and wear rate of NW15T are greatly reduced under the synergistic effect of TiS and corrosion products. |
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