Papers by Keyword: Multi-Arc Ion Plating

Abstract: In order to reduce the adhesion tendency of aluminum melt on the die casting mold and extend the service life of the die, multi-arc ion plating technique was used to deposit Ti/TiN/CrN multi-layer coating on the surface of 8418 hot-working mold steel. Corrosion resistance of the steel and the Ti/TiN/CrN coating against Al alloy melt was studied. X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy were used to study the microstructure, phase constituent and phase composition of the materials. Uniform Ti/TiN/CrN coatings with good bonding interfaces and a total thickness of about 2 μm were obtained. Results showed that Ti/TiN/CrN coating can improve the corrosion resistance of the 8418 hot-working die steel significantly against the aluminum alloy melt.

Abstract: TiN coatings were prepared by using multi-arc ion plating technique at different N₂ partial pressures. The surface morphology of the coatings was characterized by using a tabletop scanning electron microscope. The cross-sectional microstructure was investigated by using a field emission scanning electron microscope. The phase composition was evaluated by using an X-Ray diffractometer. The hardness and cohesion were measured by using a nanoindentation tester and a scratch instrument, respectively. The results show that the number and size of macro-particles decrease and the compactness of TiN coating increases with the increase of the N₂ partial pressure. The hardness and cohesion of the coating increase gradually with increasing N₂ partial pressures and reach a peak at 0.6 Pa; then the hardness and cohesion are significantly lower at higher N₂ partial pressures.

Abstract: Multi-arc ion plating technique was used to fabricate TiN film on the surface of high speed steel (HSS) to improve its wear resistance. The structure and morphology of TiN film were analyzed by XRD and SEM,and the bonding strength between the film and substrate was studied by the scratch tester. The results show that the thin film formed on the surface of the substrate consists of compact TiN. There are some white spots and black spots on the surface of the film. The bonding strength between the film and the substrate reaches 43 N/mm², which correlates to formation of a pseudo diffusion layer. The tribological experimental results show that plating TiN film can greatly improve wear resistance of HSS.

Abstract: In this study, the (Ti,Cr)N composite films were deposited on 4Cr13 martensitic stainless steel by multi-arc ion plating (MAIP), researched the composition, morphology and micro-hardness of (Ti,Cr)N composite films by the method of changing the current of Cr target and Ti target. The result show that: with the acr current increasing, the Cr content of (Ti,Cr)N composite films increased, the Ti content decreased, the number and size of droplets decreased, and the hardness of composite films increased first, then decreased. When the acr current was 70A, the hardness reached the maximum. At the same time, the phases of composite films changed when the Cr content increased. When the value of X was 0.28, the phase of composite was TiN and when the value of X was 0.37 or 0.65, the composite films appeared the phase of CrN and Cr₂N.

Abstract: 40Cr steel substrate was coated with Ti_0.33Al_0.67N films by Multi-arc ion technology. Analyses of substrate negative bias voltage on morphology thickness of the film, bonding strength and micro hardness and other properties. The substrate negative bias parameter designs within the scope of the existence of an optimal value, in order to get the optimal performance of the film.

Abstract: This article provides an overview of the basic properties of the TiCN hard film, preparation methods, influencing factors, and application development trend. Magnetron sputter ion plating, radiofrequency sputtering method and multi-arc ion plating three coating preparation techniques are introduced. In this paper, with the coating by multi-arc ion plating method as the study object, an overview of the impact of C and N flow to its structure, as well as temperature, coating thickness, the pulse bias, the arc current to its performance is provided. Compared to other hard coatings, the improvement in its performance is showed and the future direction of technology development of TiCN is briefly discussed.

Abstract: Me/MeN/Me (Me=Al, Ti ) multilayer thin films were deposited on silicon substrates by a multi-arc ion plating method (MAIP) and successive magnetron sputtering method (MS) respectively. The as-prepared and heat-treated films were characterized by scanning electron microscope (SEM) and auger electron spectra (AES). The results revealed that MS method has an advantage over MAIP method to prepare the Al/AlN/Ti submicron thin films which have high density, clear interface and smooth surface. In addition, the present study indicated that both the deposition sequence and mid-layer composition have a significant effect on the thermal stability. After heat-treatment at 500 oC for 10 min, the Al/AlN/Ti multilayer film prepared by the MS method has good thermal stability without surface crack or surface flaking. Furthermore, significant diffusion of oxygen element and nitrogen element within the multilayer interface was observed by the AES measurement. It is believed that the element diffusion in the multilayer interface plays an important role in the binding strength of multilayer interface.

Abstract: Experiments were carried out with different process parameters to investigate the effects of used parameters on corrosion resistance of TiN coatings obtained. In experiments, TiN imitation gold decoration coatings were prepared on 1Cr13 pen-point and brass chromium plating pen-coil by multi-arc ion plating method. The phase composition of TiN coatings was measured by x-ray diffraction. The corrosion resistance of TiN coatings was tested by salt-mist and artificial-sweat experiments. The relationship between corrosion resistance of coatings and process parameters were analyzed. Therefore, the optimum process parameters were achieved suitable for plating coatings on substrates of 1Cr13 pen-point and brass chromium plating pen-coil with good imitation gold. Imitation gold plating layers obtained have good gloss, corrosion resistance, high hardness, wear resistance, and easy to maintain. The results showed that the corrosion resistance of coatings is more easily influenced by changes of PN2 and Vbom than that of matrix-bias voltage. The TiN coatings are of resistant to corrosion no matter they are in single or multi phase structure. The optimum parameters of achieving good corrosion resistance of TiN coatings are PN2=0.48Pa, Vbom=400V，bias=-20V. Under the optimum conditions, the obtained surface corrosion resistance state of the coatings can reach at least eight grades, even above ten grades.

Abstract: 40Cr steel substrate was coated with TiAlN/TiN films by multi-arc ion technology. The effect of technical elements on the surface and micro hardness of TiAlN/TiN films had been studied with metallographic microscope, SEM and micro hardness instrument. The results show that the negative bias and the target current have marked influence in performance of TiAlN/TiN films. The content of Ti and Al in films becomes lower and lower when the negative bias becomes higher and higher. The content of Ti/Al of films increases when the target current increases. The micro hardness increases firstly and then drops with the increase of negative bias or the target current.

Abstract: TiN coatings were deposited on AISI M2 high-speed-steel (HSS) substrates by multi-arc ion plating technique. The thickness of substrate was 1.0 mm and five thicknesses of TiN coatings were 3.0, 5.0, 7.0, 9.0 and 11.0 μm, respectively. X-ray diffraction (XRD) has been used for measuring residual stresses. The stresses along five different directions (Ψ=0°, 20.7°, 30°, 37.8° and 45°) have been measured by recording the peak positions of TiN (220) reflection for each 2θ at different tilt angles Ψ. Residual compressive stresses present in the TiN coatings. Furthermore, the results revealed that the value of the residual stresses in TiN coatings was high. While the coatings thickness changed from 3 to 11 μm, the residual stresses varied from -3.22 to -2.04 GPa, the intrinsic stresses -1.32 to -0.14 GPa, the thermal stresses -1.86 to -1.75 GPa. The residual stresses in TiN coatings showed a nonlinear change. When the coatings thickness was about 8 μm, the residual stresses in TiN coatings reached to the maximum value.