在内衬材料中添加氢氧化铝提升长水口的抗热震性:内衬材料显微组织与性能及长水口颈部最大热应力数学模型

doi:10.11896/cldb.201904009

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Abstract The purpose of the present work is to promote thermal shock resistance of long nozzles by adding aluminum hydroxide into the lining mate-rial. A series of long nozzle lining materials differing in α-Al₂O₃ powder content and dried Al(OH)₃ content were prepared, by using Al₂O₃ hollow spheres and sintered corundum as main raw materials, and through the processes of preblending, forming and heat treatment (at 950 ℃). Microstructure analyses based on XRD and SEM confirmed the same phase composition of the lining materials despite the variation of Al-(OH)₃ content, as well as a discontinuous distribution of Al(OH)₃ within the material. The mechanical and thermal properties tests showed that, the increase of Al(OH)₃ could lead to the declines of bulk density (higher pore ratio), room temperature flexural strength, elastic modulus, and thermal conductivity and expansion coefficient, with respect to the lining materials. Furthermore, by applying finite element analysis and linear regression, we established a mathematical model for the maximum thermal stress of the neck portion of long nozzle (σmax), in which σmax exhibited a ‘cross linear relationship’ with thermal expansion coefficient (α), elastic modulus (E) and thermal conductivity (λ) of lining material. Then combined the obtained mechanical & thermal properties and the proposed model, and as a result the inverse correlation between Al(OH)₃ content and σmax (i.e. positive correlation between Al(OH)₃ content and thermal shock resistance) could be revealed. Finally we fabricated long nozzles with the Al₂O₃-Al(OH)₃ lining and the ordinary silica lining, respectively, and compared their practical operation performances. The erosion rate results of the former and the latter were 0.032 mm/min and 0.049 mm/min, which supported the proposed mathematical model.

Key words： continuous casting lining of long nozzle aluminum hydroxide maximum thermal stress of the neck portion mathematical model erosion rate

Published: 11 March 2019

CLC number:

TQ175

Fund:This work was financially supported by the National Natural Science Foundation of China (51772277,51372231),Science and Technology Innovation Talent Project of Henan Province(164100510023),Basic and Leading Edge Research Project of Henan Province(162300410057).

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	Articles by authors
	TIAN Xiangyu
	SHANG Xinlian
	LI Hongxia
	WANG Xinfu
	LIU Guoqi
	YANG Wengang
	YU Jianbin

Cite this article:

TIAN Xiangyu,SHANG Xinlian,LI Hongxia, et al. Improving Thermal Shock Resistance of Long Nozzle by Adding Aluminum
Hydroxide into Lining Material: Microstructure, Properties of Lining
Material, and Mathematical Model for Maximum Thermal
Stress of Long Nozzle Neck Portion[J]. Materials Reports, 2019, 33(4): 611-616.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.201904009 OR http://www.mater-rep.com/EN/Y2019/V33/I4/611

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