Deposition Failure Analysis of TiN/MT-TiCN/Al₂O₃/TiN Coatings on Regenerated Cemented Carbides AITranslate

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Chinese Library Classification Number:TG174.4[金属学及工艺—金属表面处理]

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Cemented carbide tools are widely used in machinery manufacturing and other fields due to their excellent hardness,strength,corrosion resistance,wear resistance and impact resistance.However,as the industrial demand for high quality components increases,the output of waste cemented carbide tools has gradually increased,causing serious pollution to the environment.Therefore,researching regenerated cemented carbide and improving the properties of the carbide through applying coating with excellent performance are of great significance.A TiN/MT-TiCN/Al₂O₃/TiN composite coating was applied to a regenerated cemented carbide by chemical vapor deposition(CVD)in this paper.In the process of coating production,it was found that the phenomenon of coating failure existed in regenerated cemented carbide substrate.XRD,SEM and EDS were employed in researching the phase composition and microstructure of the coating to explore the failure reasons.The results show that the holes on the surface of regenerated cemented carbide substrate and the diffusion of impurity elements are the main factors affecting the growth of the coating.The holes on the substrate surface caused by the detachment of fine-grained binder phase after sandblasting treatment will affect the growth and quality of the coating.Impurity elements can lead to slow growth and coarsening of the coating microstructure during the deposition process.Among them,the α-Al₂O₃coating has a growth pause phenomenon,which leads to coating failure,whileκ-Al₂O₃can grow normally.This study provides reference for optimizing the CVD coating of regenerated cemented carbide.