Compositional, Structural and Mechanical Properties of (Ti,Cr,Al)N Coatings Deposited on the Surface of Piston Rings

Abstract:

A novel super hard coating system of (Ti,Cr,Al)N was synthesized by multi arc ion plating technology. The Metallic ratio of Cr, Ti, and Al was varied by adjusting the currents of different TiAl target. The CrTiAlN composite coatings with different chemical composition were deposited on the surface of 65Mn steels by multi-ion plating technology in a gas mixture of Ar+N2. The coatings were characterized by means of energy dispersive X-ray(EDX) analysis, X-ray diffractmetry(XRD), scanning electronic microscopy(SEM), microhardness tester respectively. The experimental results show that the deposition velocity of CrTiAlN coatings reached maximum value, about 72nm/min. And the surface morphology of CrAlTiN films are compact and dense. The main composition of CrTiAlN composite films is Cr、Ti、Al、N, with the mass percent of Cr 29.61%,Ti 21.42%,Al 14.88%,N 34.10%. And the cross-section morphology appears as fibrous columnar crystals structure. Compared with CrN coatings, the preferential growth orientation of CrAlTiN films was changed from CrN (111) to CrN (200) after the addition of Ti, Al element. When the TiAl target arc current was 50A, the hardness reached the maximum value, 35GPa.

• Periodical: Applied Mechanics and Materials (Volumes 584-586)
• Pages: 1495-1499
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.584-586.1495
• Online since: July 2014
• Authors: Zhi Hai Cai, Hang Qin, Xiao Kun Du, Zhen Yang
• Keywords: Compositional, CrTiAlN Composite Coatings, Mechanical Property, Microstructure

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