The frictional resistance
and machining quality when cuttingcarbon fiber reinforced plastics (CFRP) laminates are
associated with tribological behavior of tool materials. In the present study,
the tribological properties of three types of monolayer microcrystalline
diamond (MCD) coatings, nanocrystalline diamond (NCD) coatings and dual-layer
MCD/NCD coatings sliding against CFRP are investigated under dry lubricated
conditions using the rotational friction tester. The coefficients of friction
(COF), wear rate and worn surfaces of the contacted surfaces are analyzed for
the MCD-CFRP, NCD-CFRP and MCD/NCD-CFRP contacting pairs. The results show that
compared with the monolayer MCD and NCD, the bilayer of MCD/NCD coating
displays the lowest COF with the value of ~0.13, it is 42% and 55% of the
values for MCD and NCD coatings. Due to the rough surfaces of MCD, the wear
debris of CFRP on MCD samples exhibits the plowing effect. While for the NCD and MCD/NCD
samples, the wear fragments display the planar shapes. The wear rate of CFRP
against MCD is more than twice that of CFRP against NCD, due to the excellent
loading capacity. While the wear rate of CFRP against MCD/NCD is about twice
than that of CFRP-NCD pairs. The bilayer of MCD/NCD combines the excellent advantages
of high hardness of MCD and the smooth surface of NCD. It shows the broad
application potential for the bilayer coatings.
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