Microstructure, Hardness and Oxidation Resistance of CrN and CrAlN Coatings Synthesized by Multi-Arc Ion Plating Technology

Abstract:

Approximately 2 μm thick CrN and CrAlN coatings were synthesized on silicon and spring steel substrate by multi-arc ion plating technology. The nanoindentation techniques, Auger electron spectroscopy (AES) analysis, scanning electron microscopy, X-ray diffraction and oxidation furnace were used to investigate the mechanical property, oxidation resistance and microstructure of the coatings. The XRD data showed that the CrN and CrAlN coatings exhibited B1 NaCl structure. Nanoindentation measurements showed that as-deposited CrN and CrAlN coatings exhibited a hardness of 19 and 30 GPa respectively. Compared with CrN coatings, the CrAlN composite coatings show much better oxidation resistance. And the oxidation resistance ability will enhance with increasing Al content, because A12O3 will form after oxidation in high temperature condition which could reduce the diffusivity ability of oxygen.

• Periodical: Advanced Materials Research (Volumes 168-170)
• Pages: 2430-2433
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.168-170.2430
• Online since: December 2010
• Authors: Zhi Hai Cai, Zhang Ping, Yue Lan Di
• Keywords: CrAlN Coatings, CrN, Mechanical Property, Microstructure, Multi-Arc Ion Plating, Oxidation Resistance

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