Effects of In Situ Formation of Magnesium Aluminate Spinel on Performance of Modified Sizing Nozzle

Abstract:

The modified sizing nozzle with excellent performances was successfully prepared by using of Mg,Y-PSZ as aggregates, Mg,Y,Ca-PSZ as fines, adding a certain amount of Al₂O₃-ZrO₂ composite powders prepared by sol-gel. Effects of magnesium aluminate spinel in-situ synthesized in modified sizing nozzle on its performances were studied in this experiment. The results show that, the content of cubic zirconia in the sizing nozzle was decreased with the increasing of Al₂O₃-ZrO₂ composite powders; the samples of modified sizing nozzle have no diameter-expanded after 30 hours service. The use effects are obviously better than that of Al₂O₃-ZrO₂ composite powders free. The main reason is that a new bond phase magnesium aluminate spinel was in-situ generated through the reaction between Al₂O₃ in Al₂O₃-ZrO₂ composite powders and the stabilizer MgO from partially stabilized zirconia in the sintering process at high temperature. The spinels embedded in the substrate of zirconia grow further and fill between zirconia particles. This prevents the stabilizer of CaO further desolventizing and also stop losing the eutectics formed by the reaction with compositions of molten steel. Therefore, the stability of zirconia and the corrosion resistance of the sizing nozzle were improved.

• Periodical: Advanced Materials Research (Volumes 750-752)
• Pages: 1130-1136
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.750-752.1130
• Online since: August 2013
• Authors: Guang Liang Yuan, Qun Hu Xue, Xiang Li, Yuan Yang
• Keywords: Al₂O₃-ZrO₂ Composite Powders, Magnesium-Aluminate Spinel, Sizing Nozzle

References

[1] Wuhua Wu, Wendong Xue, Changhe Gao, et al: Materials Review, 2006, 20, Album VII: 418-421 (In Chinese).

[2] Shengsheng Zhang, Xianjian Meng, Qunsheng Yang, et al: Continuous Casting, 2001(2): 13-15(In Chinese).

[3] Xianyang Chen, Bo Fu: Refractories, 2002, 36(6): 342-345(In Chinese).

[4] Martin Wiesel: The Refractory Engineer, 2003(3): 2-8.

[5] Yongzhi Zhang, Licun Gao, Xiangyang Mao, et al: Refractories, 2006, 40(1): 41-43 Property(In Chinese).

[6] Xiaoli Tian, Qunhu Xue, Chongbo Xue: Bulletin of the Chinese Ceramic Society, 2010, 29(4): 918-921(In Chinese).

[7] Huazhi Gu, Xunhai Tang, Houzhi Wang: Journal of Wuhan University of Science and Technology (Natural Science Edition), 2004, 27(2): 111-113(In Chinese).

[8] Xinfu Wang, Hongxia Li, Bin Yang: Continuous Casting, 2003(3): 37-39(In Chinese).

[9] Maofa Jiang, Lifeng Sun, Jingkun Yu: Industrial Heating, 2005, 34(2): 56-59(In Chinese).

[10] Qinghua Chen, Ziping Cao, Junsai Sun, et al: Nonferrous Metals, 2001, 53(2): 71-76(In Chinese).