|
CSME 2022/12
Volume 43 No.6
:
531-538
|
|
A New Extreme Pressure Additive Containing Phosphorus and Nitrogen (PN) to Improve Gear Oil Tribological Properties
Fengqi Fana, Kang Zhoua, Liping Wanga, Binbin Weia, Guangneng Dongb and Qi Liub
aLanzhou lubricating oil research and development center of China national petroleum corporation, Lanzhou 730000, PR China
bKey Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710000, PR China
|
Abstract:
In this paper, a new benzotriazole phosphiteammonium salt derivative extreme pressure additivecalled PN was synthesized. Four-ball and optimalschwinggung reibungund verschleiss (SRV) testingmachine were used to test the high temperature andextreme pressure performance of PN additive, andcomparisons were made with the commonly usedadditives including Zinc Dialkyl Dithiophosphates(ZDDP) and Di-n-butyl phosphite (T304). The resultsshow that the coefficient of friction (COF) and wearamount of the PN additive in the four-ball experimentwere much smaller than that of the ZDDP and T304additives. The COF of the PN additive in the RSVexperiment changed slightly with temperature, and ithad better high temperature extreme pressureperformance in friction reduction than the traditionalZDDP and T304 additives. When the temperaturewas 120oC, the COF of PN was about 30% lowerthan that of traditional additives. Thermogravimetricanalysis showed that the failure temperature of PNadditives was within 180-200oC, and the thermalstability was better than that of ZDDP and T304.After the four-ball test, a scanning electronmicroscope (SEM) was used to observe themorphology of wear spots on the ball surface. It wasfound that the wear spots containing PN additive hadslight adhesive wear, while those containing ZDDPand T304 showed serious adhesion and ploughingwear, and the surface appeared peeling and tearing.XPS was used to detect the chemical composition offriction surface containing PN additive, and thus theformation process of film on frictional surface wasanalyzed.
|
|
Keywords: PN additive; extreme pressure; friction reduction; formation process of film
|
Download PDF
|
|
*Corresponding author; e-mail:
|
©
2022
CSME , ISSN 0257-9731
|