Research On Preparation And Properties Of AlCrSiN

With the concept of“Made in China 2025”green manufacturing,dry processing has become an important material shaping method in the future.During the dry machining process,a large amount of heat accumulates at the tip of the tool,which increases tool wear.Therefore,dry cutting has placed higher demands on the performance of the tool.In this paper,the problem of CrAlN coating tool wear is severe in the dry milling process,and the surface quality is low.The cathode arc ion plating technology is used to incorporate Si element into the CrAlN coating to improve the performance of CrAlN coating tool.The morphology,microstructure and mechanical properties of the coating were characterized by ball mill,roughness meter,Rockwell hardness tester and scanning electron microscope.The milling performance of CrAlN coated tools and AlCrSiN coated tools was analyzed under the same dry milling conditions.This research can be used to guide the preparation and application of new coatings.The research contents are as follows:?1?The AlCrSiN coating was prepared by a single factor method to change the deposition parameters.The bond strength of the coating increases with the increase of the preparation temperature,and increases first and then decreases with the deposition time.In addition,the surface roughness value of the coating increases as the temperature rises.Prolonging the deposition time tends to cause the coating thickness to be too high,resulting in internal stress concentration,and the hardness of the coating is improved,but the bonding property is poor.The AlCrSiN coating prepared by this subject has a thickness of 2.7?m,a hardness of 34 Gpa,and a bonding strength of HF1.?2?AlCrSiN coatings with different Si element contents were prepared.With the increase of Si content,the bonding strength of AlCrSiN coating is higher,and the hardness of AlCrSiN coating increases first and then decreases.The amorphous Si_xN phase inhibits the coarse grain growth of CrAlN and acts to refine the grains.At the same time,the Si_xN phase and CrAlN phase co-epitaxial growth enhance the hardness of the coating.The decrease in coating hardness is due to the excessive content of Si,which causes the epitaxial growth to be destroyed.?3?A high-hardness AlCrSiN coating is preferred for high temperature oxidation experiments.As the oxidation temperature increases,the surface oxidation of the CrAlN coating is significant.At the same oxidation temperature,the AlCrSiN coating after oxidation has a lower oxygen content than CrAlN.XRD analysis showed that the combined state of Cr and O in the oxidized AlCrSiN coating was CrO instead of Cr₂O₃,indicating that Cr and O did not react sufficiently and exhibited good oxidation resistance.?4?Cutting experiments were performed on two coated tools.Compared with CrAlN coated tools,AlCrSiN coated tools have low vibration,stable and stable cutting force,high surface quality,higher wear resistance and longer service life at the same milling distance.In addition,the wear patterns of the two coatings in milling are consistent with the three stages of normal tool wear.