Microstructure, corrosion and tribological properties of Ti(CN) multilayer coatings on 35CrMo steel by CVD
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Rare Met. DOI 10.1007/s12598-014-0305-4
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Microstructure, corrosion and tribological properties of Ti(CN) multilayer coatings on 35CrMo steel by CVD Jin Zhang, Qi Xue*, Song-Xia Li, Zeng Qin
Received: 16 July 2013 / Revised: 12 October 2013 / Accepted: 5 May 2014 Ó The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2014
Abstract Multilayer hard coatings of TiC/Ti(C,N)/TiN on 35CrMo steel substrates were deposited by a chemical vapor deposition system (CVD). X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectrometer (EDX) were used to analyze phase composition, morphology, and chemical composition of the coatings. The mechanical, corrosion, and wear properties of the produced coatings were primarily examined. The results indicate that multilayer coatings are consisted of TiC, Ti(C0.2N0.8), and TiN. The coatings surface is dense, and the thickness is about 11 lm. The adhesion between coatings and steel substrate was characterized by critical load (Lc) and is found to be about 70 N. The microhardness of the multilayer coatings is HV 2400, which is about 5 times as that of the 35CrMo steel substrate. The corrosion current of the coated sample is 4.368 9 10-5 Acm-2, which decreases by one order of magnitude compared with the uncoated one (1.324 9 10-4 Acm-2). Friction and wear tests show that the TiC/Ti(C,N)/TiN coatings with high hardness adhere well to the 35CrMo substrate and display good wear resistance and low friction coefficient under non-lubricated friction test at room temperature. Keywords TiC/Ti(CN)/TiN; Hard coatings; 35CrMo steel; Friction; Chemical vapor deposition
J. Zhang, Q. Xue*, S.-X. Li, Z. Qin School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China e-mail: [email protected]
1 Introduction 35CrMo alloy steel is widely used in petroleum machine industry for its favorable properties of high intensity, strong tenacity, and good machining ability [1, 2]. However, its poor properties in wear and corrosion resistances are the two major causes limiting its application. Surface modification and coatings technology are a practical way used to extend the service life of component. Hard, corrosion-resistant ceramic coatings are extremely useful in engineering applications, where corrosion and wear act simultaneously, such as during processing in oil and gas well [3]. Titanium-containing coatings, e.g., TiN, Ti(CN), and TiC, are commonly used as a protective coating material to extend the part life and to improve the working performance because of their high hardness [4], good wear resistance [5], and corrosion resistance [6]. Among them, Ti(CN) is considered to be a favorable coating which offers better hardness and abrasive wear resistance than the conventional TiN coating and excellent chemical stability compared with TiC [7]. There are two kinds of method for preparing TiC, TiN, and Ti(CN) coatings, namely, chemical vapor deposition(CVD) [8] and physical vapor dep
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