Study On The Deposition Mechanism Of TiAlN Coating Prepared By Ion Plating

TiAlN coating is one of the common coatings,and the deposition mechanism of this coating prepared by ion plating technology is studied by numerical simulation.In the existing coating preparation,the randomly generated micron-sized particles during the coating preparation process has always been an important influencing factor affecting the coating performance,there are also research work on micron-sized particles,but the research focus is generally on changing the process parameters to eliminate the generation of micron-sized particles,there are few studies on its specific influence mechanism on the matrix.The reason is that during the coating preparation,the causes of micron-sized particles are complex,the location is random,and the size difference from the rest of the particles is large,and it is difficult to study the mechanism of the influence of micron-sized particles on coating performance.The preparation technology of TiAlN coating is becoming more and more perfect,but the mechanism of its preparation still needs to be further studied.This paper aims to study the process of preparing TiAlN coating by arc ion plating on 45 steel by numerical simulation and supplemented by experimental observation,simulates the atomic motion behavior at the atomic level during the deposition process,simulates the thermal deformation and erosion behavior caused by micronlevel particles hitting the matrix,simulates the deposition behavior of multiple particles,and studies the deposition mechanism of the coating in combination with the preparation of experimental coating.The main conclusions are as follows:(1)The deposition process at the atomic level of arc ion plating was studied by molecular dynamics simulation,and it was concluded that when Ti atoms were deposited on the surface of the matrix,they entered the surface of the matrix,a small number of matrix-atoms escaped,and the length of the bond between crystal atoms was about 2.5(?).The greatest chance of finding other particles is 2.5 (?) around the Ti atom,and the maximum density of the remaining atoms around the Ti atom in the deposit is 8.(2)The J-C constitutive model combined with arbitrary Lagrange method and coupled Euler Lagrange method was used to study the impact of micron-sized single particles on the surface of the substrate,and the greater the particle velocity,the greater the influence on the topography of the coating;The high-speed deposition of Ti particles will produce crater morphology of the matrix,Al particles only produce a small amount of compression deformation on the surface of the matrix,increase the kinetic energy of Ti particles to gradually increase the deformation of the matrix,and gradually increase the amount of self-deformation,increase the kinetic energy of Al particles,and the particles absorb energy through their own deformation,which has little impact on the surface morphology of the matrix.When the initial temperature of the particle increases,more kinetic energy of the particle is converted into elastic energy,so that the influence of the particle on the matrix becomes smaller,and the particle itself produces greater deformation.(3)The model was built using Python software,using the J-C constitutive model combined with coupled Eulera Lagrangian method to simulate the impact of multi-particle large particles on the matrix in the coating preparation process and combining with the actual deposition process to analyze the influence of large particles on the surface morphology of the coating,it is concluded that the multi-particle large particles hit the surface of the matrix,and the small particles will grow optimally with the deposition of micron-sized large particles in their surface orientation,and there is a clear boundary between micron-level particles;Micronsized particles are discontinuous points in the coating,but when directly facing the crack,they can hinder the crack growth to some extent.In multi-particle deposition simulations,when the temperature rises from 200° to 400°,the porosity of the coating decreases and the coating becomes more easily integrated.