Research On Preparation And Property NiCrAlY And Magnisum Alloy Damping Coatings

Nowadays, various rotating machinery has been widely applied in aerospace, aviation, petroleum, pharmaceutical and other industries. With the development of modern science and technology, the application environment becomes more and more serious. These key components in the rotating machinery, such as blades and other thin wall components, usually need to bear greater impact and vibration loading, which can produce greater vibration stress, leading to fatigue failures. Good damping vibration suppression is required for these thin wall components. Therefore, adapting reasonable negative suppressing vibration method to reduce the vibration damage has significant meaning in practical. In this study, the preparation and characterization of the alloy damping coating on the thin wall components and their influence on the substrates will be discussed.Firstly, NiCrAlY and magnisum alloy coatings were prepared on the stainless steel substrates by arc ion plating machine. Coatings with different surface characteristic were prepared by altering the current and substrate negative bias based on the material characteristics respectively. Surface morphology and chemical composition were obtained by SEM(Scanning Electron Microscope), EDS(Energy Dispersive Spectrometer) and XRD(X-Ray Diffraction) testings. Through the discussion of SEM and XRD image, surface morphology and chemical composition under different perparing parameters were obtained. The influence of parameters of the prapartion such as arc current and substrate negative bias on the coating surface morphology strcture was discussed. Combined with the discussion on the testing results, the influence rules of the different parameters on the coating surface morphology, chemical composition and strcture.Secondly, DMA(Dynamic Mechanical Analyse) test was carried on the perpared samples and damping capacity was obtained. At room temperature, three point bending method was applied to test the samples’storage modulus(E’) and loss modulus(E")5and the damping capacity of coating samples were obtained(Q-1), and the influence of coating strcture on the damping property was also discussed. The results approved that the damping capacity of substrate was prominent ameliorated. Combining with the characterization results, the coating samples’ stacking fault, porosity and other factors could enhance the damping capacity.In this paper, the MS(Materials Studio5.0software) was applied to simulate the interface problem of metal coating, and this was an exploratory study. Double-layer structural model was used to build the model in the MS and geometry optimization and mechanical property calculation were run on the MS. The simulation results show that the molecular dynamics simulation is an effective tool to calculate the mechanical properties of coating. The simulation results can be compared with experimental results, and provide effective data for meso and macro simulation of coating’s damping property.