首页|The microstructural, mechanical and thermal properties of TiAlVN, TiAlSiN monolithic and TiAlVN/TiAlSiN multilayered coatings
The microstructural, mechanical and thermal properties of TiAlVN, TiAlSiN monolithic and TiAlVN/TiAlSiN multilayered coatings
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NSTL
Elsevier
TiAlVN coatings gain extensive attention due to the self-lubrication effect with elevated temperatures. However, the poor oxidation resistance of TiAlVN limits their industrial application. In order to improve the oxidation resistance of TiAlVN, the TiAlSiN insertion layer is introduced into TiAlVN to synthesize nano-multilayered Ti0.40Al0.50V0.10N/Ti0.56Al0.34Si0.10N (ML_1) and Ti0.40Al0.50V0.10N/Ti0.46Al0.45Si0.09N (ML_2). Ab initio calculations combined with experiments prove that Si-doping reduces the solid solubility of Al in the cubic structure, while V-addition increases its solubility. The hardness of Ti0.40Al0.50V0.10N and Ti0.56Al0.34Si0.10N with cubic structure are 29.2 ± 0.9 and 36.5 ± 0.9 GPa, while Ti0.46Al0.45Si0.09N with mixed cubic and hexagonal structure exhibits low hardness of 29.1 ± 0.9 GPa. The coherently interfacial strengthen enhances the hardness to 33.6 ± 1.0 GPa of ML_1 and 35.2 ± 1.1 GPa of ML_2. Additionally, the Si-containing insertion layers improve the thermal stability of TiAlVN coating, where the onset temperature of w-AlN formation during annealing is increased by ~ 200–300 °C. After annealing at 1200 °C, Ti0.40Al0.50V0.10N, Ti0.56Al0.34Si0.10N and Ti0.46Al0.45Si0.09N possess the hardness values of 26.2 ± 1.5, 38.8 ± 0.8 and 29.5 ± 1.0 GPa, while ML_1 and ML_2 still manifest superior hardness values of 35.4 ± 1.1 and 35.1 ± 1.1 GPa. Furthermore, the oxidation resistance of our multilayers lies between that of TiAlVN and TiAlSiN. After oxidation at 700 °C for 10 h, Ti0.56Al0.34Si0.10N, Ti0.46Al0.45Si0.09N, ML_1 and ML_2 present oxide layers of ~0.1, ~0.1, ~2.3 and ~1.7 μm, respectively, while Ti0.40Al0.50V0.10N coatings has been completely oxidized.
First principlesHardnessOxidation resistanceThermal stabilityTiAlVN/TiAlSiN
Zhang J.、Chen L.、Kong Y.
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State Key Laboratory of Powder Metallurgy Central South University
NSTL
Elsevier
