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Title: Effects of Temperature and Pressure on ZDDP

Abstract

A recent theoretical study proposed that the anti-wear property of zinc dialkyl dithio phosphate (ZDDP) is due to the formation of chemically connected networks as a result of pressure-induced cross-linkage of phosphate groups of thermally decomposed ZDDP. To investigate the initial decomposition processes and the possibility of linking of phosphate groups in the decomposed product, in-situ high-pressure and high-temperature infrared (IR) spectroscopy using synchrotron radiation were performed on the original ZDDP. At room temperature no substantial structural change was observed up to 21.2 GPa, a pressure far exceeding the predicted onset of a structural transformation for the model zinc phosphate at 7 GPa. The observed Pressure induced broadening of the IR peaks is most likely associated with structural disorder or amorphization of ZDDP which is completely reversible upon decompression. When ZDDP is heated under pressure, an irreversible transformation was observed around 225 {sup o}C and 18.4 GPa. The experimental results show that ZDDP undergoes substantial decomposition at high pressures and high temperatures but no hint of cross-linkage of phosphate groups was found.

Authors:
; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
929969
Report Number(s):
BNL-80573-2008-JA
TRN: US0806677
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Tribology Letters; Journal Volume: 28
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; DECOMPOSITION; PHOSPHATES; PRESSURE RANGE MEGA PA 10-100; SPECTROSCOPY; SYNCHROTRON RADIATION; TEMPERATURE RANGE 0400-1000 K; TRANSFORMATIONS; ZINC; ZINC PHOSPHATES; national synchrotron light source

Citation Formats

Tse,J., Song, Y., and Liu, Z. Effects of Temperature and Pressure on ZDDP. United States: N. p., 2007. Web. doi:10.1007/s11249-007-9246-5.
Tse,J., Song, Y., & Liu, Z. Effects of Temperature and Pressure on ZDDP. United States. doi:10.1007/s11249-007-9246-5.
Tse,J., Song, Y., and Liu, Z. Mon . "Effects of Temperature and Pressure on ZDDP". United States. doi:10.1007/s11249-007-9246-5.
@article{osti_929969,
title = {Effects of Temperature and Pressure on ZDDP},
author = {Tse,J. and Song, Y. and Liu, Z.},
abstractNote = {A recent theoretical study proposed that the anti-wear property of zinc dialkyl dithio phosphate (ZDDP) is due to the formation of chemically connected networks as a result of pressure-induced cross-linkage of phosphate groups of thermally decomposed ZDDP. To investigate the initial decomposition processes and the possibility of linking of phosphate groups in the decomposed product, in-situ high-pressure and high-temperature infrared (IR) spectroscopy using synchrotron radiation were performed on the original ZDDP. At room temperature no substantial structural change was observed up to 21.2 GPa, a pressure far exceeding the predicted onset of a structural transformation for the model zinc phosphate at 7 GPa. The observed Pressure induced broadening of the IR peaks is most likely associated with structural disorder or amorphization of ZDDP which is completely reversible upon decompression. When ZDDP is heated under pressure, an irreversible transformation was observed around 225 {sup o}C and 18.4 GPa. The experimental results show that ZDDP undergoes substantial decomposition at high pressures and high temperatures but no hint of cross-linkage of phosphate groups was found.},
doi = {10.1007/s11249-007-9246-5},
journal = {Tribology Letters},
number = ,
volume = 28,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}