Preparation and Characterization of A Metal-Based Al/Al2O3 Gradient Coating

Su Ping Li; Jian Qiu Feng; Xiao Lin Jia; Bao Lan Liu

doi:10.4028/www.scientific.net/AMR.284-286.177

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 284-286Preparation and Characterization of A Metal-Based...

Preparation and Characterization of A Metal-Based Al/Al₂O₃ Gradient Coating

Abstract:

An Al/Al₂O₃ gradient coating applied on a heat-resistant stainless steel was prepared through a slurry process by using aluminum and γ-Al₂O₃powders as the transition filler material, alpha alumina as the surface coating material, aluminum dihydrogen phosphate as the binder, and sodium molybdate as the corrosion inhibitor. The effects of heat treatment temperature, adhesive/filler ratio and γ-Al₂O₃content on the bonding strength, microhardness and thermal shock resistance were investigated. The crystal phase and microstructure were characterized by XRD and SEM. The results indicated that the composition of the coating changed continuously from surface to coating-substrate interface. The coating could offer high bonding strength and good thermal shock resistance when heat treated at 700°C.

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Advanced Materials Research (Volumes 284-286)

Pages:

177-181

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.284-286.177

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Online since:

July 2011

Authors:

Su Ping Li, Jian Qiu Feng, Xiao Lin Jia, Bao Lan Liu

Keywords:

Al/Al₂O₃ Gradient Coating, Bonding Strength, Slurry Process, Thermal Shock Resistance

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