Skip to main content Accessibility help
×
Home

Tribochemistry of ZDOL Decomposition on Carbon Overcoats in Ultra-High Vacuum (UHV)

  • C. S. Bhatia (a1), C.-Y. Chen (a2), W. Fong (a2) and D. B. Bogy (a2)

Abstract

Tribochemical studies of the effect of lubricant bonding on the tribology of the head/disk interface (HDI) were conducted using hydrogenated (CHx) carbon disk samples coated with perfluoropolyether ZDOL lubricant. The studies involved drag tests with uncoated and carboncoated Al2O3-TiC sliders and also thermal desorption experiments in an ultra-high vacuum (UHV) tribochamber. We observed that a larger mobile lubricant portion significantly enhances the wear durability of the (head/disk interface) HDI by providing a reservoir to constantly replenish the lubricant displaced in the wear track during drag tests. In the thermal desorption tests we observed two distinct temperatures of desorption. The mobile ZDOL layer is desorbed at the lower thermal desorption temperature and the residual bonded ZDOL layer is desorbed at the higher thermal desorption temperature. We also observed that the hydrogen evolution from CHx overcoats initiates lubricant catalytic decomposition with uncoated Al2O3/TiC sliders, forming CF3 (69) and C2F5 (119). The generation of Hydroflouric acid (HF) during thermal desorption experiments provides the formation mechanism of Lewis acid, which is the necessary component for catalytic reaction causing Z-DOL lube degradation.

Copyright

References

Hide All
1. Pacansky, J. and Waltman, R.J., Chem.Mater. 5, 486494 (1993).
2. Vurens, G., Zehringer, R., and Saperstein, D. in Surface Science Investigations in Tribology, edited by Chung, Y.W., Homola, A.M., and Street, B., Washington D. C., American Chemical Society, 169180 (1992).
3. Strom, B.D., and Bogy, D.B, Wear 168, 3136 (1993).
4. Zehe, M.J. and Faut, O. O., ASME Tribology Trans. 33, 634640 (1990).
5. Kasai, P.H., Adv. Info. Storage Syst. 4, 291314 (1992).
6. Wei, J., Fong, W., Bogy, D.B., and Bhatia, C.S., Tribology Letters 5, 203209 (1998).
7. Bhatia, C.S., Fong, W., Chen, C.-Y., Wei, J., Bogy, D.B., Anders, S., Stammler, T., and Stohr, J., IEEE Trans. on Magnelics 35 (2), 910915 (1999).
8. Bogy, D.B., Yun, X.H., and Knapp, B.J., IEEE Trans on Magnetics 30 (5), 369373 (1994).
9. Lin, J.-L., Bhatia, C.S., and Yates, J.T., Jr., J. Vac. Sci. Technol. A 13 (2), 63168 (1995).
10. Vurens, G.H. and Mate, C.M., Applied Surface Science 59, 281287 (1992).
11. Cornaglia, L. and Gellman, A.J., J. Vac. Sci. Technol. A 15 (5), 27552765 (1997).
12. Perry, S.S., Merrill, P.B., and Kim, H.I., Tribology Letters 2, 393404 (1996).
13. Chen, C.-Y., Fong, W., Bogy, D.B., and Bhatia, C.S., CML Technical Report No. 98–016, ASME Tribology Trans., in press (1999).
14. Tyndall, G.W., Leezenberg, P.B., Waltman, R.J., and Castenada, J., Tribology Letters 4, 103108 (1998).
15. Waltman, R.J., Pocker, D.J., and Tyndall, G.W., Tribology Letters 4, 267275 (1998).
16. Karis, T.E., Tyndall, G.W., and Jhon, M.S., submitted to ASME Tribology Trans., March 1998.
17. Chen, C.-Y., Fong, W., Bogy, D.B., and Bhatia, C.S., CML Technical Report 99–007, Tribology Letters 7, 110 (1999).
18. Yun, X.H., Bogy, D.B., and Bhatia, C.S., ASME Tribology Trans. 119, 437443 (1997).
19. Waltman, R.J., and Tyndall, G.W., submitted to J. Phys. Chem, 1999.
20. Steritwieser, A., and Heathcock, C. H., Introduction to Organic Chemistry, (Macmillan Publishing Co., Inc., New York, 1976).
21. Sianesi, D., Zamboni, V., Fontanelli, R., and Binaghi, M., Wear 18, 85100 (1971).
22. Chen, C.-Y., Fong, W., Bogy, D.B., and Bhatia, C.S., CML Technical Report 99–011, Tribology letters, in press (1999).
23. O'Connor, T.M., Jhon, M.S., Bauer, C.L., Min, B.G., Yoon, D.Y., and Karis, T.E., Tribology Letters 1, 219223 (1995).
24. Ma, X., GUI, J., Smoliar, L., Grannen, K., Marchon, B. Jhon, M.S., and Bauer, C.L., J. of Chemical Physics 110 (6), 31293137 (1999).
25. Ma, X., Gui, J., Grannen, K., Smoliar, L. Marchon, B., Jhon, M.S., and Bauer, C.L., Tribology Letters 6, 9;14 (1999).
26. Ma, X., Gui, J., Smoliar, L., Grannen, K., Marchon, B., Jhon, M.S., and Bauer, C.L., Physical Review E 59 (1), 722727 (1999).
27. Tyndall, G.W., Waltman, R.J., and Pocker, D.J., Langmuir 14, 75277536 (1998).
28. Chen, C.-Y., Fong, W., Bogy, D.B., and Bhatia, C.S., CML Technical Report 99–008, submitted to J. American Vacuum Society (1999).

Tribochemistry of ZDOL Decomposition on Carbon Overcoats in Ultra-High Vacuum (UHV)

  • C. S. Bhatia (a1), C.-Y. Chen (a2), W. Fong (a2) and D. B. Bogy (a2)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed