Browsing by Author "Yang, Si Ze"
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Item Effect of chromium nitride coating on the corrosion and wear resistance of stainless steel(2000-02-02) Jagielski, Jacek; Khanna, A. S.; Kucinski, Jacek; Mishra, D. S.; Racolta, P.; Sioshansi, Piran; Tobin, Eric; Thereska, J.; Uglov, Vladimir; Vilaithong, T.; Viviente, J.; Yang, Si Ze; Zalar, Anton; TECNOLOGÍA DE MEMBRANAS E INTENSIFICACIÓN DE PROCESOSIon beam-assisted deposition (IBAD) technique has been used to deposit chromium nitride on the stainless steel substrates. Characterization and performance of this coating was carried out by a round-robin test at various laboratories. About 300 samples, prepared at Spire, USA, were distributed to 10 different laboratories. Characterization of coated materials, carried out using Rutherford backscattering (RBS), X-ray diffraction (XRD), glancing X-ray diffraction, Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS), confirmed a well-adherent layer of chromium nitride with composition and thickness of Cr0.8N0.2 and 1.2 μm, respectively. The performance of the coating was tested by tribological tests: dynamic micro-indentation, micro-hardness, wear and friction, and corrosion tests. The coating was found to be hard with good wear resistance and had enhanced resistance to corrosion in acid media.Item Wear-resistant metal-carbon composite coating(2000-06-01) Uglov, V. V.; Kuleshov, A. K.; Rusalsky, D. P.; Onate, J. I.; Yang, Si Ze; Tecnalia Research & InnovationCarbon coatings containing a metallic component (zirconium, tantalum) were deposited with ion assistance on AISI M2 steel samples using a SVETLYACHOK source. The coatings were studied by Auger electron spectroscopy (AES), transmission electron microscopy (TEM), Raman spectroscopy (RS) and pin-on-disc tribological tests. The results have shown that the carbon coatings contain up to 20 at.% of the metallic component. These coatings have an amorphous structure with sp3-type bonds. The presence of the coating on the surface of AISI M2 steel reduces the friction coefficient by a factor of five under the tribological conditions investigated. It is found that the tribological properties of the coatings deposited with the assistance of metal ions are significantly better than those coatings deposited with assistance of carbon ions. The latter coatings had carbon atoms with mixed sp3-sp2 bonds. The deposited composite carbon coatings are stable at a temperature of 100°C and allow a twofold improvement in the lifetime of fuel pump rods. (C) 2000 Elsevier Science S.A. All rights reserved.