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

Liang Zhao, Qun-hu Xue

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Cite this article as:

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://dx.doi.org/10.1007/s12613-017-1488-0
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://dx.doi.org/10.1007/s12613-017-1488-0
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研究论文

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

基金项目: 

This work was financially supported by the National Natural Science Foundation of China (No. 51372193).

    通信作者:

    Qun-hu Xue E-mail: xuequnhu@xauat.edu.cn

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.

 

Research Article

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

Author Affilications
  • Funds: 

    This work was financially supported by the National Natural Science Foundation of China (No. 51372193).

  • Received: 07 January 2017; Revised: 04 April 2017; Accepted: 10 April 2017;
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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