The flow, energy distribution and concentrations profiles of Ti ions in cathodic arc are studied by test particle Monte Carlo simulations with considering the mass transfer through the macro-particles filters with inhomogeneous magnetic field. The loss of ions due to their deposition on filter walls was calculated as a function of electric current and number of turns in the coil. The magnetic field concentrator that arises in the bending region of the filters leads to increase the loss of the ions component of cathodic arc. The ions loss up to 80 % of their energy resulted by the paired elastic collisions which correspond to the experimental results. The ion fluxes arriving at the surface of the substrates during planetary rotating of them opposite the evaporators mounted to each other at an angle of 120° characterized by the wide range of mutual overlapping.
In this work, the influence of bias voltage on the structure, composition and physical properties of TiCrN-Mo2N-Ni arc Physical Vapor Deposition (arc-PVD) coatings were studied. Multilayer structure formed at all applied bias voltage due to planetary rotation of substrates. Thickness of sublayers range from 1 to 32 nm and defined by the plasma flow intensity from evaporators. Monte-Carlo calculation was used to study structure of prepared coatings. According to calculation and analysis of TEM images, sublayers composed by nitrides mixture. All coating characterized by high hardness, which correlated with residual stress of coatings.
The structure and composition of multicomponent TiCrMoN-Ni arc-PVD coatings with high nickel concentration (more than 8 at.%) are studied at bias potentials of 80-140 V. All coatings are characterized by a layered structure, the modulation period tends to decrease as increasing the bias potential. After annealing at 850 °C in vacuum, the coatings retain their layered structure without signs of dissolution of layers in each other. Nickel sublayers retain their polycrystalline structure, at the same time, the monolayer CrN are formed due to recrystallization.
Coatings (Ti, Al0,03)N and comparison samples – coatings (Ti, Al0,25)N and TiN are formed by the arc-PVD method on the WC-Co carbide alloy. The phase composition, the substructure characteristics and the mechanical properties of the coatings were investigated. The addition of Al and its increase in the coating composition is accompanied by a decrease in the value of the lattice parameter, refinement of the coatings subgrain structure and an increase in both microstrains and macrostresses. At the same time, the hardness of the coatings and the values of the parameters H3/E2 and H/E increase with a decrease in the relative work of plastic deformation of the samples, which is a characteristic of their viscosity. Durability tests were carried out using a cutting tools with the investigated coatings showed the advantage of the (Ti,Al0.25)N coating in continuous turning operations. The (Ti,Al0.03)N coating is characterized by increased resistance compared to other tested coatings in milling operations and compared to TiN coating in continuous cutting.
This paper presents the results of modeling the growth of ceramic coatings obtained by the kinetic Monte Carlo method. In the considered model, the possibility of forming misoriented grains in the direction of coating growth and in the plane of coating is realized. To verify the model, three coatings of different compositions were prepared, and their structure and composition was studied by TEM and EDS.
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