| Effects of temperature-gradient-induced damage of zirconia metering nozzles |
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| 作者姓名： | Liang Zhao Qun-hu Xue |
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| 作者单位： | College of Materials and Mineral Resources, Xi'an University of Architecture and Technology, Xi'an 710055, China |
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| 基金项目： | This work was financially supported by the National Natural Science Foundation of China |
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| 摘 要： | The effects of temperature-gradient-induced damage of zirconia metering nozzles were investigated through analysis of the phase composition and microstructure of nozzle samples. The analysis was carried out using X-ray diffraction and scanning electron microscopy after the samples were subjected to a heat treatment based on the temperatures of the affected, transition, and original layers of zirconia metering nozzles during the continuous casting of steel. The results showed that, after heat treatment at 1540, 1410, or 1300℃ for a dwell time of 5 h, the monoclinic zirconia phase was gradually stabilized with increasing heat-treatment temperature. Moreover, a transformation to the cubic zirconia phase occurred, accompanied by grain growth, which illustrates that the temperature gradient in zirconia metering nozzles affects the mineral composition and microstructure of the nozzles and accelerates damage, thereby deteriorating the quality and service life of the nozzles.
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| 关 键 词： | temperature gradient zirconia metering nozzles mineral composition microstructure damage mechanism |
Effects of temperature-gradient-induced damage of zirconia metering nozzles |
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| Liang Zhao,Qun-hu Xue.Effects of temperature-gradient-induced damage of zirconia metering nozzles[J].International Journal of Minerals,Metallurgy and Materials,2017,24(9):999-1003. |
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| Authors: | Liang Zhao Qun-hu Xue |
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| Institution: | College of Materials and Mineral Resources, Xi'an University of Architecture and Technology, Xi'an 710055, China;Shaanxi Techno-institute of Recycling Economy, Xi'an 710055, China |
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| Abstract: | The effects of temperature-gradient-induced damage of zirconia metering nozzles were investigated through analysis of the phase composition and microstructure of nozzle samples.The analysis was carried out using X-ray diffraction and scanning electron microscopy after the samples were subjected to a heat treatment based on the temperatures of the affected,transition,and original layers of zirconia metering nozzles during the continuous casting of steel.The results showed that,after heat treatment at 1540,1410,or 1300℃ for a dwell time of 5 h,the monoclinic zirconia phase was gradually stabilized with increasing heat-treatment temperature.Moreover,a Vansformation to the cubic zirconia phase occurred,accompanied by grain growth,which illustrates that the temperature gradient in zirconia metering nozzles affects the mineral composition and microstmcture of the nozzles and accelerates damage,thereby deteriorating the quality and service life of the nozzles. |
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| Keywords: | temperature gradient zirconia metering nozzles mineral composition microstructure damage mechanism |
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