Papers by Keyword: TiN Coating

Abstract: The exceptional corrosion resistance, low weight, and high strength of titanium (Ti) make it an excellent choice for components in proton exchange membrane fuel cells (PEMFC). However, during PEMFC operation, Ti undergoes passivation, which diminishes the bipolar plates' (BP) ability to transport electrons between cells. Applying titanium nitride (TiN) coatings, known for their good conductive properties, can resolve this issue and enhance corrosion resistance. Additionally, using additive manufacturing (AM) to produce BP offers numerous benefits in terms of structural control for more intricate designs. This study examines the impact of TiN coating via gas nitriding on Ti-6Al-4V open structures created by powder bed fusion-electron beam/metal (PBF-EB/M) or PM routes, focusing on the surface characteristics such as composition and interfacial contact resistance (ICR).

Abstract: Generally, bias voltage exercises a great influence on micro-properties (morphology, preferred orientation, mechanical properties, and so on) of the coatings in the process of coating deposited. In order to more systematically explore the influence of bias voltage on microstructure, hardness and adhesion of TiN coatings, TiN coatings were deposited successfully on the surface of 316 stainless steel by high power pulsed magnetron sputtering (HPPMS). A field emission scanning electron microscopy equipped with energy dispersive spectrometer (FESEM/EDS) and an X-ray diffractometer were employed to analyze the surface morphology, chemical composition and phase structure of coatings, respectively. And a nanoindentation and scratch tester was used to investigate the hardness, elastic modulus and adhesion of TiN coatings. Results showed that bias voltage has a great influence on surface morphology of TiN coatings. Moreover, bias voltage can promote preferential orientation and the phase in TiN coating is mainly TiN with a small amount of Ti₂N. The influence of bias voltage on the hardness and modulus of TiN coating is not obvious, however, the binding force increases fast first and then decreases slow with the increase of bias voltage. TiN coating has excellent performance when bias voltage is-100V.

Abstract: Hot-dip process leading to creation of protective coating is one of the effective ways to protect metals from corrosion. It provides the way to obtain the coating with required physical, mechanical and chemical properties. However, contact of solid metal part with the liquid metal bath during this process may lead to changes in mechanical properties or, in extreme cases, to premature failure of the part. This is mainly due to the effect called LME. The author has researched the likelihood of occurrence of this phenomenon in parts subjected to metallization in zinc bath or in zinc bath with additions of tin or bismuth. The presented results are a continuation of these research and include an assessment of the possibility of LME occurrence in parts metallized in tin bath and subjected to external stress.

Abstract: In this paper the advantages of application of the nanocomposite track membranes (NCTM) with TiN coating as the substrates for sample preparation for their investigation by methods of electron microscopy are discussed. This membrane material was obtained by the ion-plasma sputtering of TiN coating on the polymer track-etched membrane. The physicochemical properties of NCTM were researched. Preparation technique allows to separate nanoand microdimensional samples from dry, liquid and gas mixtures for their investigation by methods of scanning and transmission electron microscopy.

Abstract: The tribological properties of TiN coating were studied at the speed of 40m/min-120m/min, under the load of 5N-15N at elevated temperatures between 200°C-600°C. It can be concluded that when the temperature is lower than 400°C, the coefficient of friction increased with temperature, but the value decreased because of the friction oxidation at 600°C.The wear mass loss of the coating increased with increasing of speeds and loads, and this proved the TiN coating was not adaptable to high temperature environment. The wear mechanisms of TiN coating at elevated temperature were abrasive wear, plastic deformation, oxidation wear and adhesion wear.

Abstract: TiN coatings with different thickness were prepared by arc ion plating (AIP) physical vapor deposition (PVD) on high speed steel (HSS) substrates. TiN coatings surface roughness was investigated by atomic force microscopy (AFM) and 3D optical profilometry and growth kinetics was described using scaling exponents β and α. The growth exponent β is 0.91-1.0 and the roughness exponent α is 0.77-0.81. Due to relatively high value of the exponent α, the surface diffusion is likely predominant smoothening mechanism of TiN growth.

Abstract: In order to reveal the failure mechanism of TiN coating, the simulations of scratch process with finite element method are carried out. Meanwhile, the stress analysis was carried out on the three stages that stylus tip indenting coating surface, slipping on coating surface and rising from coating surface. Through the observation of simulation results and the analysis of the stress shows that there are two ways of forming coating surface cracks. One is that coating interface cracks are firstly induced, thus they are propagated to the coating surface, and finally the surface cracks are formed. Other is that cracks are directly formed in coating surface. Because they are induced by maximum tensile stress, surface cracks are modeI.After stylus tip rising from coating surface, biggish residual stresses remain in the coating. Those analyses will supply the basis of coating design and application.

Abstract: The objective of this research is to characterize the effects of heat treatment such as quenching, tempering and TiN coating on mechanical and physical properties of duylos 2510 steel. These mechanical properties include wear rate, hardness, impact toughness, whereas physical properties are microstructures. Duylos 2510 steel is a cold work tool steel and has chemical composition (wt %) of 1C; 0,6 Cr; 0,1 V; 1 Mn; 0,25 Si and 0,6 W.Quenching process has been conducted by heating the specimens on austenite temperature of 800 °C with the soaking time of 30 minutes and then cooling these specimens in oil medium. Tempering process was done at temperatures of 100, 200, 300, 400, 500 dan 600 °C with holding time of 2 hours.TiN coating has been deposited on substrates by sputtering technique of Physical Vapor Deposition at temperatures of 100, 150, 200 and 250 °C with sputtering time of 45 minutes. The mechanical and physical properties have been characterized by wear test, Vickers micro hardness test, Charpy impact test, and metallography test. This research was performed at room temperature and the major parameters of this research were tempering and sputtering temperatures.The results show that tempering temperature variations give significant modification of mechanical properties. In general, the Vickers micro-hardness decreases if tempering temperatures of the specimen increase. The highest Vickers micro-hardness of TiN coatings is 290 HV_0,01 for the specimen having sputtering temperature of 200 °C. Wear rate and impact energy increase if tempering temperatures increase. The results also show that the Vickers micro-hardness of coated specimens is higher than the micro Vickers hardness of non-coated specimens

Abstract: Diamond-like carbon (DLC) and TiN coatings were deposited on the 304 austenitic stainless steel(SUS304) substrates by using unbalanced magnetron sputtering and arc ion plating techniques, respectively. The phase structure and surface morphology of coatings were characterized by SEM and XRD.The electrochemical corrosion of two coatings in different electrochemical solutions (including3.5%NaCl,10%HCl,20%NaOH) were investigated by electrochemical workstation.The result showed that DLC coating was amorphous structure and TiN coating was nano-crystalline structure.The surface of DLC coating was smooth and dense,while TiN coating existed pits.In 10%HCl and 3.5%NaCl solutions,the corrosion resistance of DLC coating increased by 4.16 and 10.9 times compared with SUS304 and increased by 5.16 and 1.11 times compared with TiN coating,respectively.But in 20%NaOH solution, the corrosion resistance of DLC was not superior to SUS304 and TiN coating.In 10%HCl solution,the corrosion resistance of TiN coating increased by 9.81 times compared with 304 SUS304.But in 3.5%NaCl and 20%NaOH solutions,the corrosion resistance of TiN coating was worse than SUS304.

Abstract: A series of TiN coatings were deposited by reactive magnetron sputtering with different target powers and different N₂ flows. The microstructure and oxidation resistance of TiN coatings were characterized by X-ray diffraction (XRD). The hardness of the thin films was characterized respectively with the nanoindentor. The effect of target powers and the N₂ flows on the microstructure, the hardness and oxidation resistance was studied. It was found that TiN coating deposited at different target powers and different N₂ flows exhibits a cubic structure with (1 1 1) preferred orientations, and the hardness of TiN coatings is 1200. The oxidation resistance of the TiN coatings is approximately 500°C.