| Superalloy has been widely used in the aerospace field because of its high temperature strength,good resistance to oxidation and hot corrosion resistance. with the continuous improvement ofaviation engine inlet temperature further enhance the high-temperature performance of superalloy hasbecome a key research issue that need addressing. Alumina and zirconia are the main material of thethermal barrier coating which can insulate the substrate from heat, and improve the use of temperature,and wear resistance. In this paper, squash presenting laser cladding technology was used in lasercladding Al2O3-13%TiO2(mass fraction) ceramic coating on GH4169, a more systematic study of thecoating microstructure, phase structure and performance characteristics, The main contents are asfollows:(1) From the interaction between the ceramic material and laser, punching principle, and crackcontrol three aspects to analyze the basic theory of squash presenting laser cladding ceramic coating,providing a theoretical basis for process test.(2) According to the characteristics of laser cladding, using ANSYS finite element analysissoftware to establish a single-channel scanning laser cladding ceramic coating temperature finiteelement model to analyze the coating influence the caused by laser cladding process parameters.(3) By orthogonal test based on preheat temperature, laser power and scanning rate, the typicalceramic coating and dilution characteristics were discussed, and process test parameters wereoptimization. Carried out ceramic coating under preferred process parameters and analyzed thecoating microstructure, phase and performance characteristics.(4) Based on the principles of neural networks and genetic algorithms, genetic neural networkprediction model was established between the process parameters and quality of cladding layermorphology, having a guiding significance for future technological parameters selection of squashpresetting laser cladding ceramic coatings. |
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