| DI Ze-chao,JIANG Yu,ZHANG Meng-jia,MA Yong-hong,ZHANG Xue-tao.Synergistic Effect of P-containing Friction Modifier and Ca-containing Detergent in Automatic Transmission Fluid on Anti-shudder Characteristic[J],49(9):81-90 |
| Synergistic Effect of P-containing Friction Modifier and Ca-containing Detergent in Automatic Transmission Fluid on Anti-shudder Characteristic |
| Received:May 18, 2020 Revised:September 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.09.008 |
| KeyWord:wet clutch tribofilm automatic transmission fluid friction modifier detergent anti-shudder |
| Author | Institution |
| DI Ze-chao |
Dalian Lubricating Oil Research & Development Institute, PetroChina, Dalian , China |
| JIANG Yu |
Dalian Lubricating Oil Research & Development Institute, PetroChina, Dalian , China |
| ZHANG Meng-jia |
Dalian Lubricating Oil Research & Development Institute, PetroChina, Dalian , China |
| MA Yong-hong |
Dalian Lubricating Oil Research & Development Institute, PetroChina, Dalian , China |
| ZHANG Xue-tao |
Dalian Lubricating Oil Research & Development Institute, PetroChina, Dalian , China |
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| Abstract: |
| The work aims to reveal the anti-shudder mechanism of tribofilm formed by friction chemical reaction between P-containing friction modifier and Ca-containing detergent. Three ATFs with different P-containing friction modifiers were tested by disc-disc tribometer, and the friction characteristics of the tribofilms formed on the steel friction disc were tested. The duration of anti-shudder property of ATF-A, B and C was 24 h, 72 h and 144 h respectively. SEM, EDX, SAM and SIMS were used to determine the chemical composition, distribution density and thickness of the tribofilms. The three kinds of P-containing friction modifiers reacted with Ca in the detergent of ATFs during friction and formed Ca-P tribofilms. The thickness of ATF-A, B and C tribofilms was 400, 900 and 1120 nm respectively. According to the SEM images, the integral value of P-element depth distribution in SAM and the surface distribution value of Pelement detected by SIMS, the density of the three tribofilms had a positive correlation with their anti-shudder durability. Although the P/Ca ratio, distribution pattern, density and thickness of the three tribofilms are different, the three kinds of Ca-P tribofilms are all helpful to keep the anti-shudder property of clutch. The P-containing friction modifier with higher reactive activity can form a thicker and denser tribofilm with high coverage on the friction surface, and the anti-shudder durability can be kept for a longer time. |
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