Tribokemi av smrjningsmedel under hgt tryck Joel Andersson High - - PowerPoint PPT Presentation

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Tribokemi av smrjningsmedel under hgt tryck Joel Andersson High - - PowerPoint PPT Presentation

Aug 04, 2023 129 likes •389 views

Tribokemi av smrjningsmedel under hgt tryck Joel Andersson High pressure spectroscopy lab Division of Physics,TFM Lule University of Technology This project is conducted in High Pressure Spectroscopy Laboratory (Materials Physics

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Joel Andersson

Tribokemi av smörjningsmedel under högt tryck

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

This project is conducted in High Pressure Spectroscopy Laboratory (Materials Physics group) Supervisor: Professor Alexander Soldatov Project student Shuai Wei (AMASE program)

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Summary

Introduction, Motor oil Additives Methods and materials Results Conclusions

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Introduction: Motor oil additives

Advanced additives are used to enhance the properties of lubricants One of them is Zinc Dialkyl Dithiophosphate, ZDDP

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

ZDDP as an additive

First used in the late 30:s. Anti-wear properties discovered in the 40: s. Extensively studied till today.

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

ZDDP and a Tribofilm

The image is from: H. Spikes. Tribology Letters, Vol. 17, No. 3, 2004 Typical conditions for tribofilm formation: 6-9 GPa 100-250 °C

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Tribochemistry of ZDDP

Solution decomposition of ZDDP Thermal decomposition of ZDDP (at high temperature) Cross-linkage at high pressures

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Decomposition in solution

Image from: H. Spikes. Tribology Letters October 2004.

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Thermal decomposition

Mercaptides (Thiols) Olefins (alkanes) Alkyl Sulphides H2 S Zinc phosphate

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Cross-linkage of Zinc phosphate

Starting structure After one compression cycle Cross-linkage at 7GPa Nicholas J Mosey; Martin H Müser; Tom K Woo Science, 2005; 307, 5715

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Project objectives

Understanding the tribochemistry of ZDDP in solution To map the pressures and temperatures that induce change of ZDDP solution

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Methods and Materials

ZDDP in hexadecane Diamond Anvil Cell Confocal Raman spectroscopy

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Hexadecane(C16H34) ZDDP (Zn(S2P(OH)2)2

Materials

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

hυ hυ3 hυ2 hυ1 hυ

Raman spectroscopy

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

High Pressure Diamond Anvil Cell

Pressure up to 3 Mbar Temperature up to 600 °C Incoming light Diamond anvil Gasket (sample chamber) Sample chamber

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Results

Reference spectra, measurements of substances at ambient conditions. Definition of vibrations to follow in high pressure

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Raman spectra of ZDDP and Hexadecane

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Raman spectra of saturated solution

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

830 cm-1 peak

Raman spectra in the 800-900cm-1 region

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Raman spectra in the 900-1000cm-1 region

830 cm-1 peak

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Spectral subtraction: ZDDP-Hexadecane solution

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Conclusion

We can distinguish the prominent ZDDP peaks at 963 and 830 cm-1 Analysis of these peaks indicates that they

  • riginate from Phosphorus-Oxygen and Zinc-

Oxygen bonds. We will follow these peaks evolution at high pressure

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Future work

High pressure study of ZDDP in different solvents High pressure and High temperature examination of ZDDP in solvent

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Acknowledgements

Professor Roland Larsson (Machine Elements Division, TFM, LTU)

  • Dr. Rihard Pasaribu, Dr. Piet Lugt (SKF R&D division, Holland)

Collaboration

Shuai Wei (AMASE project student) Andreas Müller (former group member, now at MPI Stuttgart)) Matias Mases (group member)

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High pressure spectroscopy lab Division of Physics,TFM Luleå University of Technology

Thank you for your attention

Questions?