Study On The Process And Performance Of TiC、TiB2 Coating Deposited By Electric Spark Deposition On The Surface Of Austenitic Stainless Steel

316L austenitic stainless steel is extensively used in agricultural machinery parts due to its excellent performance.However,the harsh working environment of these parts often leads to problems such as wear and corrosion,resulting in reduced service life and productivity of agricultural machinery.To address this,a ceramic coating was prepared on the surface of 316L austenitic stainless steel as agricultural machinery parts using Electric Spark Deposition technology.Electric Spark Deposition technology is a preferred method for surface strengthening and defect repair of mechanical parts due to its easy processing,simple operation,and low impact on the substrate.Specifically,this paper explores the preparation of TiC and TiB₂ coatings on the surface of 316L austenitic stainless steel using Electric Spark Deposition technology,and presents the main research contents and results.The aim of this research is to improve the service life and wear resistance of 316L austenitic stainless steel as agricultural machinery parts by enhancing its surface hardness and wear resistance with ceramic coatings:To obtain an ideal TiC coating,an orthogonal test of L16（4³）Electric Spark Deposition was employed and the quality of the prepared coating was evaluated in this study.XRD analysis revealed that the TiC coating mainly consists of austenite,TiC,and Ti₂C_0.06 phases.Deposition under argon protection was found to increase the hardness of the TiC coating.The cross-sectional analysis of the coating exhibited a typical four-zone structure,which includes a coating layer,a transition layer,a heat-affected zone and the substrate,from the surface to the inside.These findings provide valuable insights for the development of effective surface modification strategies to enhance the performance of 316L austenitic stainless steel as agricultural machinery parts.In this study,we identified the optimal process parameters for the preparation of TiB₂ coatings via Electric Spark Deposition voltage of 20 V,deposition capacity of3000μF,and deposition time of 120 s.However,TiB₂ coatings prepared using the same process exhibited significant oxidation due to its inferior thermal stability compared to TiC.Microcracks were also observed in the TiB₂ coatings,and this can be attributed to the inability of brittle ceramic coatings to release internal stresses through deformation,leading to crack formation when stress concentrations reached a certain threshold.Additionally,we found that TiB₂ deposition on the surface of a TiC coated surface was not successful.To overcome this issue,we successfully prepared a composite coating with good density and uniformity by introducing a Ni intermediate layer.This composite coating comprised of a TiB₂ surface layer,Ni middle layer,and a TiC bottom layer.Our findings demonstrate the importance of carefully optimizing process parameters and developing effective approaches to address technical challenges in order to achieve high-performance ceramic coatings.This study analyzed the wear weight loss,friction coefficient,and surface microscopic morphology of TiC layer,TiB₂ layer,composite coating,and substrate316L austenitic stainless steel plate deposited with optimal process parameters.Based on our findings,it can be concluded that the wear weight loss and friction coefficient followed the following pattern:Substrate 316L>TiC coating>TiB₂ coating>composite coating.The morphology of wear marks on the coating and substrate showed that the wear resistance of the coating was better than that of the substrate.Thus,the wear resistance of the coating prepared using electro-fire deposition technology on the surface of 316L austenitic stainless steel was found to be superior to that of the 316L austenitic stainless steel substrate.These results provide valuable insights into the development of high-performance ceramic coatings as a means of enhancing the durability and service life of agricultural machinery parts.