Microstructure and High-Temperature Oxidation of Ni-Si₃N₄ Composite Coatings by Pulse Electrodeposition

Abstract:

Nickel matrix and Si₃N₄ micron particles were co-deposited on the aluminum alloy by pulse electro-deposition for high temperature performance. Meanwhile, the oxidation resistance was evaluated through the high temperature oxidation test. The phase structure, micrographs and components of the composite coatings were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) together with energy dispersive spectroscopy (EDS) respectively. The results indicated that Si₃N₄ particles were uniformly distributed across the coating and there were no pores and cracks or other defects at the coating/substrate interface. Ni-Si₃N₄ composite coatings are characterized by pyramidal micro-crystallite structure. The thickness of Ni-Si₃N₄ composite coatings were up to 80 μm for 2h. The results also revealed that the Ni-Si₃N₄ composite coatings presented better oxidation resistance than the pure Ni coating and aluminum alloy at high temperature. After oxidation at 673 K for 8h, the oxidation resistance of Ni-Si₃N₄ composite coatings presented the improved oxidation resistance behavior compared to pure Ni and the aluminum alloy, respectively.

• Periodical: Materials Science Forum (Volume 817)
• Pages: 421-425
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.817.421
• Online since: April 2015
• Authors: Kun Zhao, Wan Chang Sun, Chun Yu Miao, Hui Cai, Ju Mei Zhang, Li Bin Niu
• Keywords: Microstructure, Ni-Si₃N₄ Composite Coatings, Oxidation Resistance, Pulse Electrodeposition

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