Research on Evolution Process of Zr-Ti-B-N Tool Coating at 600℃
In order to evaluate the heat resistance of Zr-Ti-B-N tool coating at 600℃,it is subjected to explore the effect of different heat treatment times on the structure and properties of the coating.In this work,Zr-Ti-B-N nanocomposite coatings are synthesized by high power impulse magnetron sputtering combined with pulsed DC magnetron sputtering,and heat treated by high temperature Muffle furnace.The tribometer and nanoindentation are used to research the mechanical and tribological properties of Zr-Ti-B-N coating after heat treatment.And XRD,SEM are used to characterize the micro-structure of Zr-Ti-B-N coating with different circumstance.The result indicates that the mechanical properties,tribological properties and microstructure of the coating are significantly affected by different treatment times at high temperature.After heat treatment at 600℃ for 1h,the comprehensive mechanical properties of the films has little variations,the hardness is 23.7GPa,andthe adhesionis 31.7N.After heat treatment for 2h,the grain size gradually increases,the columnar crystal structure become sapparent,and the hardness of the coating begins to reduce.After heat treatment for 3h,obvious oxidation film appeares on the coating surface,the grain size of the coating increases by 27.0%,the coefficient of friction is reduced to a minimum of 0.66,and the adhesion varies little.
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