Effects of temperature-gradient-induced damage of zirconia metering nozzles

Liang Zhao; Qun-hu Xue

doi:10.1007/s12613-017-1488-0

Volume 24 Issue 9

Sep. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(9): 999-1003

Liang Zhao and Qun-hu Xue, Effects of temperature-gradient-induced damage of zirconia metering nozzles, Int. J. Miner. Metall. Mater., 24(2017), No. 9, pp. 999-1003. https://doi.org/10.1007/s12613-017-1488-0

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Liang Zhao and Qun-hu Xue, Effects of temperature-gradient-induced damage of zirconia metering nozzles, Int. J. Miner. Metall. Mater., 24(2017), No. 9, pp. 999-1003. https://doi.org/10.1007/s12613-017-1488-0

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Research Article

Effects of temperature-gradient-induced damage of zirconia metering nozzles

Liang Zhao^1,2 and
Qun-hu Xue^1,2,

+ Author Affiliations

Corresponding author:
Qun-hu Xue E-mail: xuequnhu@xauat.edu.cn
Received: 8 January 2017; Revised: 5 April 2017; Accepted: 11 April 2017

Abstract

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 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.
- temperature gradient;
- zirconia metering nozzles;
- mineral composition;
- microstructure;
- damage mechanism

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References

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