| YANG Shu-yan,ZHANG Dong,GUO Feng.Tribological Properties and Synergistic Effect of Ionic Liquids and ZDDP[J],47(6):122-130 |
| Tribological Properties and Synergistic Effect of Ionic Liquids and ZDDP |
| Received:January 02, 2018 Revised:June 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.06.018 |
| KeyWord:lubricant ionic liquid additives ZDDP tribological properties synergistic effect film forming characteristic |
| Author | Institution |
| YANG Shu-yan |
1.School of Mechanical Engineering, Qingdao University of Technology, Qingdao , China; 2.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| ZHANG Dong |
School of Mechanical Engineering, Qingdao University of Technology, Qingdao , China |
| GUO Feng |
School of Mechanical Engineering, Qingdao University of Technology, Qingdao , China |
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| Abstract: |
| The work aims to reduce amount of ZDDP in industrial lubricants or to develop new additives by going into tribological properties and synergistic mechanism of IL and ZDDP additive. Polyalphaolefins (PAO-4 and PAO-8) were chosen as base oil, zinc dialkyl dithiophosphates (ZDDP) and quaternary phosphonium salt oleic acid ionic liquids (IL) were selected as additives. Effects of additives on friction and wear properties of base oil, and synergy mechanism were studied on four-ball testing machine. Morphology and chemical constituents of wear scars were analyzed with SEM and EDS. 3D morphology and roughness of scar surfaces were acquired with a surface roughness profilometer. Effects of additives on film forming characteristics were studied with a ball-disk optical interferometer. At the test temperature of 40 ℃, friction coefficient of ZDDP and IL compound fell in between that of ZDDP and IL. At 100 ℃, the base oil PAO4 failed, friction coefficient decreased to 0.085 after addition of ZDDP and IL compound, which was lower than that of base oil containing IL and ZDDP only. Friction coefficient of base PAO8 was about 0.11. Friction coefficient of the base oil containing IL only was close to that of solution containing ZDDP and IL compound (nearly 0.09). SEM images showed that wear scar diameter was the smallest when the ZDDP and IL compound was added to the base oil at 40 ℃ and 100 ℃, and surface roughness value was below that of base oil and ZDDP. At the entrainment speed of 300 mm/s and 450 mm/s, central film thickness of lubricating oil could be increased, and effectively oil starvation could be alleviated effectively when IL or ZDDP and IL compound was added. Compared with base oil, it is found that excellent synergistic effect of anti-friction and anti-wear can be achieved when ZDDP and IL are compounded, especially at the high temperature. Under mixed lubrication conditions, starvation conditions in the contact zone can be retarded effectively when IL alone or the ZDDP and IL compound is added to the base oil PAO. |
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