Papers by Keyword: CrAlSiN

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Authors: Zhi Tong Chen, Guang Jian Peng, Yuan Xia, Guang Li
Abstract: The effect of annealing temperatures on surface morphologies, microstructure, and mechanical behaviors of CrAlSiN coatings with different Si content was investigated. EDX, XRD and SEM were employed to reveal the compositions and microstructure of CrAlSiN coatings. For Si content ≤8.6%, grain sizes reduced with temperature increasing to 400°C and then increased with further increase in temperature. For Si content ≥10.7%, grain sizes gradually reduced with annealing temperature increasing. When the annealing temperature arrived at 400°C, the hardness of CrAlSiN coatings with different Si content was much higher than as deposited. While the annealing further increased to 800°C, the hardness of CrAlSiN coatings with Si content ≤8.6% reduced, but the hardness of CrAlSiN coatings with Si content ≥10.7% continued to increase.
Authors: Shih Kang Tien, Chih Hsiung Lin, Yan Zuo Tsai, Jenq Gong Duh
Abstract: CrAlSiN hard coatings were fabricated on the Si substrate from metallurgical Cr0.45Al0.45Si0.10 alloy target by reactive r.f. magnetron sputtering. The oxidation resistance of CrAlSiN coatings was investigated after annealing at temperatures between 900 and 1100°C for 1 hr in air. The phase identification and microstructure of CrAlSiN coatings after heat treatment were analyzed by X-ray diffraction (XRD). The hardness of CrAlSiN coating after heat treatment at 900oC for 1hr in air is slightly decreased from 30.2GPa to 28.3±1.3GPa, which was caused by the thin oxide formation on the surface of the film. The microstructure of CrAlSiN coating after heat treatment at 1000oC from 1 hr analyzed by TEM revealed two types of layer feature, including the nanocrystalline grain embedded in the Al-riched amorphous layer and reaction interface with relative high content of Si.
Authors: Jhun Yew Cheong, Xing Zhao Ding, Beng Kang Tay, Xian Ting Zeng
Abstract: In this paper, CrAlSiN coatings are deposited by a lateral rotating cathode arc technique. The high temperature oxidation behaviors of these coatings are studied in ambient atmosphere at temperatures ranging from 800°C-1000°C for an hour. The ternary TiAlN coating is used as the benchmark in this study. The surface morphology and chemical composition of the coating samples before and after oxidation at different temperatures are analyzed by scanning electron microscopy (SEM) equipped by energy dispersive X-ray spectrometer (EDX), glow discharge optical spectrometry (GDOS) and X-ray diffraction (XRD). The CrAlSiN coatings show much better oxidation resistance than the TiAlN coatings. TiAlN starts to oxidize from 800oC and forms a complete surface oxide layer after oxidation at 1000oC for an hour. However, CrAlSiN shows a relatively good oxidation resistance below 1000oC and only is oxidized to form a thin oxide scale with a thickness of 0.3 µm at 1000oC for one hour. It is found that the oxidation of both coatings is triggered from the surface metallic droplets generated by the arc deposition process.
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