Abstract
In this study, the effect of oxygen addition on the structure, mechanical and thermal properties of CrN coatings was investigated. CrN, Cr0.50O0.07N0.43 and Cr0.47O0.22N0.31 coatings reveal a single-phase cubic structure, and further increasing oxygen content results in the formation of a corundum structured Cr2O3 coating. An increased hardness from ~16.9 GPa for CrN to ~21.9 GPa for Cr0.50O0.07N0.43, ~27.0 GPa for Cr0.47O0.22N0.31, and finally ~28.6 GPa for α-Cr2O3 is obtained. Cr0.50O0.07N0.43 and Cr0.47O0.22N0.31 coatings show a deferred onset temperature of nitrogen loss than CrN by ~100 °C. During annealing, the hardness value of the CrN coating decreases to ~11.3 GPa at 900 °C and then inversely increases to ~17.9 GPa at 1200 °C, while those of Cr0.50O0.07N0.43 and Cr0.47O0.22N0.31 coatings exhibit a continuous drop to ~14.5 and ~20.6 GPa at 1200 °C, respectively. The oxidation resistance of Cr-O-N coating is closely related to oxygen content. After oxidation at 800 °C for 20 h, the oxide scales of CrN, Cr0.50O0.07N0.43 and Cr0.47O0.22N0.31 coatings are ~0.22, ~0.16 and ~0.55 μm in thickness, respectively. In addition, the Cr2O3 coating always retains excellent mechanical and thermal properties regardless of in Ar or synthetic air.
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