Friction and Wear Mechanisms of Smooth Diamond Films During Sliding in Air and Dry Nitrogen

Erdemir, Ali; Halter, Michael; Fenske, G.R.; Zuiker, C.; Csencsits, R.; Krauss, A. R.; Gruen, D. M.

doi:10.1080/10402009708983707

Cited by 64 publications

(35 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The resulting films exhibit a smooth surface and a uniform morphology throughout the film, which has a thicknesses of at least 20 m. The films are found to be hard, have low friction, and are wear resistant. 2,7,8 The small size of the crystallites implies that a relatively high percentage ͑up to 10%͒ of all atoms are located at grain boundaries, where they are bonded 9,10 and contribute to electrical conductivity. The UNCD films thus exhibit a combination of useful properties typical for diamond films supplemented by electrical conductivity and electron emissivity, 11 which makes them very attractive for device applications.…”

Section: Introductionmentioning

confidence: 99%

Growth of (110) diamond using pure dicarbon

et al. 2001

View full text Add to dashboard Cite

We use a density-functional-based tight-binding method to study diamond growth steps by depositing dicarbon species onto a hydrogen-free diamond ͑110͒ surface. Subsequent C 2 molecules are deposited on an initially clean surface, in the vicinity of a growing adsorbate cluster, and finally near vacancies just before completion of a full new monolayer. The preferred growth stages arise from C 2n clusters in near ideal lattice positions forming zigzag chains running along the ͓1 10͔ direction parallel to the surface. The adsorption energies are consistently exothermic by 8-10 eV per C 2 , depending on the size of the cluster. The deposition barriers for these processes are in the range of 0.0-0.6 eV. For deposition sites above C 2n clusters the adsorption energies are smaller by 3 eV, but diffusion to more stable positions is feasible. We also perform simulations of the diffusion of C 2 molecules on the surface in the vicinity of existing adsorbate clusters using a constrained conjugate gradient method. We find migration barriers in excess of 3 eV on the clean surface, and 0.6-1.0 eV on top of graphenelike adsorbates. The barrier heights and pathways indicate that the growth from gaseous dicarbon proceeds either by direct adsorption onto clean sites or after migration on top of the existing C 2n chains.

show abstract

Section: Introductionmentioning

confidence: 99%

Growth of (110) diamond using pure dicarbon

et al. 2001

View full text Add to dashboard Cite

show abstract

“…Pronounced debris also demonstrates that track HD wore at a higher rate, presumably due to the high friction run-in period. The other wear rates are similar to or less than those for smooth nanocrystalline diamond films [24,27].…”

mentioning

confidence: 99%

Origin of Ultralow Friction and Wear in Ultrananocrystalline Diamond

et al. 2008

View full text Add to dashboard Cite

“…covalent the lowThe other important bonds for the fiction and wear behavior of diamond and DLC films are the relatively weak van der Waals attraction and n-bonding, which are more relevant to graphite than to diamond or high-quality DLCS. When the sliding surfaces of diamond or DLC are graphitized under the influence of high thermal or mechanical loadings at high sliding velocities, the extent of van der Vaals and n-bonds may also become very important and dominate the fictional performance of these materials [26][27][28][29]. Furthermore, certain DLC films may contain high proportions of sp2-bonded or graphitic carbon precursors in their structures, hence the residual n-bonding can also play a major role on the friction and wear performance of these films.…”

mentioning

confidence: 99%

Synthesis of diamondlike carbon films with superlow friction and wear properties

Erdemir¹,

Eryilmaz²,

Fenske³

2000

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

Self Cite

346

223

View full text Add to dashboard Cite

In this study, we introduce a new diamondlike carbon (DLC) film providing a friction coefficient of 0.001 and wear rates of 10−9–10−10 mm3/N m in inert-gas environments (e.g., dry nitrogen and argon). The film was grown on steel and sapphire substrates in a plasma enhanced chemical vapor deposition system that uses a hydrogen-rich plasma. Employing a combination of surface and structure analytical techniques, we explored the structural chemistry of the resultant DLC films and correlated these findings with the friction and wear mechanisms of the films. The results of tribological tests under a 10 N load (creating initial peak Hertz pressures of 1 and 2.2 GPa on steel and sapphire test pairs, respectively) and at 0.2 to 0.5 m/s sliding velocities indicated that a close correlation exists between the friction and wear coefficients of DLC films and the source gas chemistry. Specifically, films grown in source gases with higher hydrogen-to-carbon ratios had the lowest friction coefficients and the highest wear resistance. The lowest friction coefficient (0.001) was achieved with a film on sapphire substrates produced in a gas discharge plasma consisting of 25% methane and 75% hydrogen.

show abstract

Friction and Wear Mechanisms of Smooth Diamond Films During Sliding in Air and Dry Nitrogen

Cited by 64 publications

References 37 publications

Growth of (110) diamond using pure dicarbon

Growth of (110) diamond using pure dicarbon

Origin of Ultralow Friction and Wear in Ultrananocrystalline Diamond

Synthesis of diamondlike carbon films with superlow friction and wear properties

Contact Info

Product

Resources

About