چكيده به لاتين
Despite advances in the application of internal coatings to gas transmission lines to reduce friction factor and erosion fluid flow equipment, but elbows at the hand pressure relief gas stations are still intense.
In this study, nanocrystalline TiZrCuN films are deposited on pipe steel substrates. The bilayer films are prepared via an RF-DC co-sputtering system. The compositional, morphological and mechanical properties of the bilayer films are characterized by X-ray spectroscopy (XRD), energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), atomic force microscopy (AFM), profilometry and nanoindentation, nanoscratch, pin on disk wear tests. XRD patterns show that the crystalline structure of the layer is weakened. While, the grain size ranging from 68 nm to 18 nm decreased with reduce in the wt % of Ti and Cu. The SEM and AFM images showed that the surface of the layers became more uniform with a decrease in the wt % of Ti and Cu and the coatings were able to reduce the roughness of the steel substrate surface by 99.8% and the thickness of layers reduced from 1222 nm to 645 nm. The results of the nanoindentation tests and nanoscratch tests showed that nanocomposite films increased hardness and young's modulus of the steel from 3 GPa to 8 GPa and from 94 GPa to 172 GPa. Comparing the friction coefficient of pipe steel with layers showed that the value of friction factor reduced from 0.5 to 0.1. The rate of wear has been improved from 3.968 mm3 /Nm for steel substrate to 0.042 mm3/Nm after depositing TiZrCuN. Over and above, the coefficient of friction (C.O.F) is decreased from nearly 4.17 for the steel substrate to nearly 0.25 after coating. All of the coatings effectively have a protective effect on pipe steel.
Keywords: RF-DC co-sputtering, TiZrCuN, nanoscratch, nanoindentation, pin on disk test, hardness, young's modulus, friction factor.
