Abstract
Cr–Si–O–N coatings with different oxygen contents were deposited by multi-arc ion plating, where various O2/(N2 + O2) reactive gas rates were adopted. The XRD and XPS results showed that the CrN crystals disappeared with the increasing of the oxygen flux ratio to 10 at.%. The microhardness of all the Cr–Si–O–N coatings was approximately 2000 Hv0.05, which were dramatically plummeted compared to that of the Cr–Si–N coatings (≈3300 Hv0.05). The Cr–Si–O–N coatings were annealed under 800 °C and 1200 °C in the air atmosphere for 2 h to study the high-temperature oxidation resistance of the coatings. Meanwhile, Cr–Si–O–N coatings with different O2/(N2 + O2) rates were also used to carry out the corrosion resistance testing using the electrochemical working station in 3.5% NaCl solution under free air condition at room temperature. The results indicated that the coatings containing oxygen were more vulnerable to the high-temperature destruction and more easily corroded in the NaCl electrolyte.
Highlights
CrN has been one of the most extensively used hard coatings for various forming and casting applications [1,2], due to its excellent high-temperature oxidation resistance and good corrosion resistance [3,4]
Cr–Si–O–N coatings with different oxygen contents were deposited by multi-arc ion plating
The oxygen contents of the deposited coatings significantly increased from 0 to 40 at.% and the N contents sharply decreased from 31.5 to 5 at.% when the O2/(N2 + O2) flux rate increased from 0% to 10%
Summary
CrN has been one of the most extensively used hard coatings for various forming and casting applications [1,2], due to its excellent high-temperature oxidation resistance and good corrosion resistance [3,4]. It has been reported that the oxygen impurity could be critically harmful to the superhard nanocomposite coatings [6,7]. Veprek et al [8] synthesized the Ti–Si–N superhard nanocomposites coatings with a hardness of ≥50 GPa, which was difficult for some other groups to achieve [9,10,11]. It is really important to investigate the influence of the oxygen and the oxygen contents on the properties of Cr–Si–N coatings. The quaternary Cr–Si–O–N coatings with different oxygen contents were deposited by a multi-arc ion plating process in a N2 + O2 atmosphere. The microstructure, mechanical, high-temperature oxidation and electrochemical corrosion resistance properties of the Cr–Si–O–N coatings, as a function of oxygen contents, were systematically investigated. Scant information about the deposition of the Cr–Si–O–N coatings has been reported [14], the influence of varying the oxygen content to the microstructure and properties of the Cr–Si–O–N coatings is still relatively unclear
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