Enhanced sealing performance with CVD nanocrystalline diamond films in self-mated mechanical seals


Nanocrystalline diamond (NCD) films were evaluated as protective tribo-coatings on silicon nitride mechanical seal rings. The NCD films were deposited by microwave plasma assisted chemical vapour deposition (MPCVD) method from a CH4/H-2/N-2 gas mixture. The sealing performance and friction behaviour of self-mated NCD films were assessed using the ring-on-ring tribological test in planar configuration varying the rotating speed and the applied load. Water sealing conditions were obtained in the P.V (P, the effective pressure and V the linear speed) range of 0.5-4.8 MPa ms(-1). The high hardness and smoothness of the NCD films resulted in a very low and stable friction coefficient value of 0.01, without any measurable wear. (C) 2008 Elsevier B.V. All rights reserved.




Materials Science


Mubarok, F; Carrapichano, JM; Almeida, FA; Fernandes, AJS; Silva, RF

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