Effect of Heat Treatment Temperature on Properties of ZrO2 Fiber Composite ZrO2-C Material

Abstract

Abstract: Submersed entry nozzle is critical functional refractories in continuous casting and the slag line parts has the worst working environment. At present, the most suitable slag line material is ZrO₂-C material. In order to improve the performance of submersed entry nozzle, ZrO₂-C material was prepared by using zirconia and flake graphite as the main raw materials, zirconia fiber and metal silica powder as reinforcement materials, and phenolic resin as binder. The effects of three heat treatment temperatures, 1 000 ℃, 1 200 ℃ and 1 500 ℃, were compared on the properties and microstructure of ZrO₂-C material. The results show that when the heat treatment temperature is higher than 1 200 ℃, the silicon powder reacts with carbon to form silicon carbide, and a large number of whisker silicon carbide interleaves with ZrO₂ fiber to form a network structure, which improves the mechanical properties and thermal shock resistance of the material.

Key words: refractory, ZrO₂-C material, heat treatment temperature, thermal shock resistance, silicon carbide whisker, submersed entry nozzle

CLC Number:

TQ175.7

CHEN Haijun, XU Enxia, LI Miao, GAO Jinxing, GE Tiezhu. Effect of Heat Treatment Temperature on Properties of ZrO₂ Fiber Composite ZrO₂-C Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3219-3225.

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Effect of Heat Treatment Temperature on Properties of ZrO₂ Fiber Composite ZrO₂-C Material

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