Wear Resistance Analysis Of TC4 Titanium Alloy Matrix SiC Coating

Metal materials play an important role in the mechanical manufacturing industry.In the process of continuous development of the manufacturing industry,more and more sophisticated or advanced institutions put forward higher requirements for metal materials,and some metals possess various excellent properties.However,the poor surface properties limit its application in the manufacturing field.Researchers have solved this problem by preparing special coatings on metal surfaces.Depending on the material and function of the coating,some coating-base materials always have various defects during use,which cannot completely compensate for the defects of metal surface properties.For example,Si C coating-titanium alloy matrix,titanium The alloy has excellent properties such as high specific strength,heat resistance,corrosion resistance,non-magnetic property and low density,but the anti-wear performance is poor.The Si C coating on the titanium alloy matrix can effectively improve the wear resistance of the titanium alloy.However,Si C ceramic materials have large brittleness and poor plastic deformation ability,and are prone to brittle fracture when subjected to irresistible external force.At the same time,the thermal conductivity and thermal expansion coefficient between Si C ceramic coating and titanium alloy matrix often vary greatly,making the external temperature When the change or the coating is subjected to frictional heat generation,a large internal stress is generated at the joint surface to cause the coating to crack or even partially fall off,thereby affecting the anti-wear performance of the coating and reducing the service life of the coating.This paper explores the effect of Si C coating thickness on the wear resistance of titanium alloy matrix from various angles,and provides a theoretical basis for finding the optimal coating thickness.The theoretical analysis made in this paper is mainly done by the finite element software ABAQUS.In order to make the simulation analysis as close as possible to the real situation,and provide theoretical reference for the constitutive model of the new material,the nanoindentation experiment is carried out on Si C and TC4 titanium alloy.To obtain the Young’s modulus and hardness of the two materials,the quasi-static tensile test,the high temperature tensile test and the speed abrupt tensile test of the TC4 titanium alloy were carried out to obtain the J-C constitutive model parameters of the TC4 titanium alloy due to The relationship between experimental conditions and time is not obtained by Si C’s DP constitutive experiment,but the model parameters in Liu Leilei’s brother’s thesis are cited.In order to verify the reliability of the simulation model,the nanoindentation simulation of Si C and TC4 titanium alloys,as well as quasi-static tensile simulation,high temperature tensile simulation and velocity abrupt tensile simulation of TC4 titanium alloy were carried out,and various simulation schemes were carried out.It is completely consistent with the corresponding experiment.The reliability of the simulation model is proved by comparing the simulation results with the experimental results.Using ABAQUS finite element software to simulate the process of abrasive grain rubbing TC4 titanium alloy matrix Si C ceramic coating,the simulated coating is thicker and the scratch depth is less than the coating thickness when it is rubbed.by changing the abrasive pressure and friction speed to simulate different friction conditions,from the vertical tensile stress between the coating and the substrate,between the coating and the substrate The tangential stress,the thermal expansion ratio of the coating and the substrate,and the coating wear rate were compared at four angles to investigate the effect of coating thickness on the anti-wear properties of the coating.