Effect Of C Element Content On TiAlSiCN Coating Properties

Composite TiAlSiCN belongs to the five-element system thin film coating because it has excellent physical,chemical and mechanical properties,including high hardness,oxidation resistance and wear resistance.Since there are many elements in the composite five-element TiAlSiCN coating,the content of elements has a great influence on the performance of the coating itself,among which the content of C element has the most obvious effect on the performance of the coating itself.Therefore,the influence of C element content on the performance of TiAlSiCN coating and its application research have great research value.In this paper,TiAlSiCN coatings with different C element content were obtained by deposition on the surface of cemented carbide tools and stainless steel specimens by cathode arc ion plating technology,and the mechanical properties and microstructure of Raman,SEM,XRD,XPS,and nanoindentation instrument coatings were used to study the influence of anti-friction and wear performance and electrochemical corrosion resistance by means of ball-disc friction and wear testing machine and electrochemical workstation.The results show that TiAlSiN coating is mainly(Ti,Al)N structure,Si elements exist in Si3N4 amorphous form,the C content in TiAlSiCN coating is 4.87%,the coating mainly contains(Ti,Al)(N,C)phase,when the carbon content further rises to9.37%,amorphous carbon appears in the coating.In addition,the hardness of TiAlSiCN coating gradually increased with the increase of C content,and the E(elastic modulus)and H(nano hardness)of the coating reached a maximum of 478.25 GPa and 33.78 GPa when the C content was 9.37%,which was 7% and 12% higher than that of TiAlSiN coating,respectively,and the amorphous carbon structure was detected by Raman test.In the friction and wear test,the C content increased from 0% to 9.37%,the friction coefficient of the coating gradually decreased from 0.086 to 0.046,the decrease reached46%,and the number of furrows on the surface of the wear mark of the coating was reduced,which was related to the graphitization of amorphous carbon at high friction flash point.The electrochemical corrosion results showed that compared with the TiAlSiN coating,the corrosion resistance of TiAlSiCN coating was enhanced,and with the increase of C content,the corrosion resistance of TiAlSiCN coating increased tendency,and when the C content was 17.36%,TiAlSiCN coating obtained the highest corrosion potential-0.079 V.Therefore,the C content has an important influence on the tribology and corrosion resistance of TiAlSiCN coating,and the coating prepared by optimizing C content has excellent comprehensive properties.Secondly,when the content of C element in TiAlSiCN coating is 9.37at%,the tool has better effect under the condition of milling 18 m,the wear resistance of the tool is better,the service life is longer,and the surface quality of the workpiece to be processed is better.