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Tribological Behavior of Diamond Coatings against Carbon Fiber Reinforced Plastics under Dry Conditions

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Document pages: 10 pages

Abstract: The frictional resistanceand machining quality when cutting carbon fiber reinforced plastics (CFRP) laminates areassociated with tribological behavior of tool materials. In the present study,the tribological properties of three types of monolayer microcrystallinediamond (MCD) coatings, nanocrystalline diamond (NCD) coatings and dual-layerMCD NCD coatings sliding against CFRP are investigated under dry lubricatedconditions using the rotational friction tester. The coefficients of friction(COF), wear rate and worn surfaces of the contacted surfaces are analyzed forthe MCD-CFRP, NCD-CFRP and MCD NCD-CFRP contacting pairs. The results show thatcompared with the monolayer MCD and NCD, the bilayer of MCD NCD coatingdisplays the lowest COF with the value of ~0.13, it is 42 and 55 of thevalues for MCD and NCD coatings. Due to the rough surfaces of MCD, the weardebris of CFRP on MCD samples exhibits the plowing effect. While for the NCD and MCD NCDsamples, the wear fragments display the planar shapes. The wear rate of CFRPagainst MCD is more than twice that of CFRP against NCD, due to the excellentloading capacity. While the wear rate of CFRP against MCD NCD is about twicethan that of CFRP-NCD pairs. The bilayer of MCD NCD combines the excellent advantagesof high hardness of MCD and the smooth surface of NCD. It shows the broadapplication potential for the bilayer coatings.

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