Zhou, Zehua

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8th International Conference on Physical and Numerical Simulation of Materials Processing (ICPNS)14–17 October 2016Seattle, Washington | Hosted by Purdue UniversitySESSION 4: WELDING AND COATING, SALON ECo-Chairs: Jun Qu, Oak Ridge National Laboratory; Yongping Lei, China Nuclear Power Design Company; Peng He, Harbin Institute of Technology; Yunlong Chang, Shenyang University of TechnologySATURDAY, OCTOBER 15, 2016Effect of post-treatment on micro-structure and properties of Al2O3–13 wt%TiO2 plasma-spray coatingZehua Zhou, Hohai UniversityABSTRACTAl2O3–13 wt%TiO2/NiCrAl (AT13) coating was prepared on Q235 steel substrate by air plasma spray process. Post-treatment of the sprayed samples was performed at the temperature range of 400–600°C in air with every 40°C interval. Bonding strength, porosity, phase analysis, and micro-structure characterizes before and after heat treatment were studied to investigate effect of heat treatment on properties of the samples. The results indicated that heat treatment in air could efficiently improve bonding strength of the coating-substrate and decreased porosi-ty of the coatings; bonding strength and densification enhanced gradually with increasing treatment temperature at the range of 400–560°C; the sample heated at 560°C exhibited the best strength of 52.54 MPa and the lowest po-rosity of 3.01% in the whole series, and the strength was over two times than that of the sample before treatment. The reasons why strength of the samples was improved were mainly derived from sufficient element diffusion and the clamping effect between the coating-substrate at proper heating temperature resulted in a “strong” interface. However, higher heating temperature of 600°C was harmful to bonding strength of the coating-substrate, and the reasons were related to excessive oxidizing product FeO and oversized oxide layer in the interface.KEYWORDS: element diffusion, bonding strength, air plasma spray, Al2O3–13 wt%TiO2/NiCrAl coating, air heat treatment

Effect of post-treatment on micro-structure and properties of Al2O3–13 wt%TiO2 plasma-spray coating

https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1195&amp;context=icpns

Effect of post-treatment on micro-structure and properties of Al2O3–13 wt%TiO2 plasma-spray coating

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