Comparative Study on the Tribological Performance of HFCVD Diamond and DLC Films under Water Lubricating Condition

Abstract:

The tribological performance of conventional microcrystalline diamond (MCD) film and diamond-like carbon (DLC) film is investigated comparatively under water lubricating condition. The MCD and DLC film are deposited on cobalt cemented tungsten carbide (WC-Co) substrate using the hot filament chemical vapor deposition (HFCVD) method and the vacuum arc discharge with a graphite cathode respectively. Scanning electron microscopy (SEM), white light interferometer, and Raman spectra are employed to characterize as-deposited MCD and DLC samples. The friction tests are carried out on a ball-on-plate reciprocating friction tester, where the sliding process is conducted under water lubricating condition. Silicon nitride, tungsten carbide, ball-bearing steel and copper are used as counterpart materials. The results indicate that DLC film always exhibits lower friction coefficient than MCD film under water lubricating condition, except the case of sliding against the silicon nitride, in which DLC film is worn out very rapidly and thus leads to the high friction coefficient. The wear resistance of DLC film under water lubricating condition is significantly poorer than that of MCD film. While sliding against silicon nitride, tungsten carbide, ball-bearing steel and copper, its wear rate is calculated as 3.67´10^-7 mm³N^-1m^-1, 9.31´10^-9 mm³N^-1m^-1, 3.54´10^-7 mm³N^-1m^-1, and 4.97´10^-8 mm³N^-1m^-1 respectively. Comparatively, no measurable wear track can be found on the worn surface of MCD films.

• Periodical: Key Engineering Materials (Volume 487)
• Pages: 155-159
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.487.155
• Online since: July 2011
• Authors: Bin Shen, Fang Hong Sun, Zhi Ming Zhang
• Keywords: Diamond Film, DLC Film, HFCVD, Tirbological Performance, Water Lubricating

References

[1] F.H. Sun, Y.P. Ma, B. Shen and et al: Diam. Relat. Mat Vol. 18 (2009), p.276.

[2] A. Inspektor, E. J. Oles, C. E. Bauer and et al: Int. J Refract. Meth Vol. 15 (1997), p.49.

[3] B. Shen, F.H. Sun, H.G. Xue and et al: Surf. Eng Vol. 25 (2009), p.70.

[4] T. Sharda, T. Soga, T. Jimbo and M. Umeno: Diam. Relat. Mat Vol. 9 (2000), p.1331.

[5] R. Lossy, D.L. Pappas, R.A. Roy and et al: J. Appl. Phys Vol. 77 (1995), p.4750.

[6] B. Shen and F.H. Sun: Proc. IME. J – J. Eng. Tribol Vol. 223 (2009), p.1049.