This paper deals with the optimisation of the single walled carbon nanotube (SWCNT) synthesis by the electric arc technique using so-called heterogeneous anodes filled with Ni and Y catalysts along with either graphite (large-grain or small-grain) or diamond powders.
The finer grain sized diamond tribosystem could guarantee full sealing at P·V≈0.8 MPa m s−1, keeping a low stationary friction coefficient of 0.05, for very long running times of 430 h (5730 km) without measurable wear.
This hardness increase is attributed to the presentation of fine crystalline grains and diamond membranes in the Cr Ni multilayer.
Both of these samples were described as "slightly compressed," with porosities of 0.83 for the SiO2 grains and 0.78 for the diamond grains.
Carbonaceous transfer films, induced by tiny diamond grains (TD grains, sizes of 0 5 μm), can effectively reduce the friction coefficients of the annealed PDC.
The wear of the annealed PDC is caused by the extraction of medium size diamond grains (MD grains, sizes of 5 15 μm).
On the other hand, it causes the extraction of medium size diamond grains (MD grains, sizes of 5 15 μm) and eventually results in the wear of PDC.
The WQ process with the highest cooling rate can effectively remove the tiny diamond grains (TD grains, sizes of 0 5 μm) on PDC surface before sliding test, which can greatly enhance the wear resistance and slightly increase the friction coefficient of PDC (< 0.1).
