Impact of the Addition of Thermo-activated Graphite Flake on the Microstructure and Properties of Carbon Blocks for Blast Furnace
WANG Tongsheng, LI Yawei, SANG Shaobai, XU Yibiao, WANG Qinghu
National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, The State Key Laboratory of Refractories and Metallurgy, Wuhan University and Technology, Wuhan 430081
Abstract: Thermo-activated graphite flakes was firstly prepared by conducting thermal oxidation on graphite flake, and then they were introduced into blast furnace carbon blocks by partial substitution of anthracite powder. The effect of thermo-activated graphite flake on phase composition, microstructure, thermal conductivity and hot metal erosion resistance of carbon blocks fired at elevated temperatures was investigated by means of XRD, SEM and Laser thermal conductivity meter, etc. It could be found from the result that thermo-activated graphite flakes exhibit lower oxidation activation energy compared with graphite flakes, indicating a higher reactivity of thermo-activated graphite flakes than that of graphite flakes. The addition of thermo-activated graphite flakes accelerated the formation of in-situ β-SiC whiskers, so as to optimize the microporous structure and enhance the cold compressive strength, thermal conductivity and hot metal corrosion resistance of carbon blocks. However, there was no significant improvement on thermal conductivity of carbon blocks with excessive addition of thermo-activated graphite flakes, accompanied by the reduction in volume ratio of pore with aperture less than 1 μm and cold compressive strength. Taking the specimens with the same amount of gra-phite flakes in comparison, carbon blocks with addition of thermo-activated graphite flakes are superior in cold compressive strength, thermal conductivity and hot metal corrosion resistance. The optimal comprehensive performance of carbon blocks appeared under the condition of adding the 6wt%—8wt% of thermo-activated graphite flakes.
王同生, 李亚伟, 桑绍柏, 徐义彪, 王庆虎. 添加热氧化鳞片石墨对高炉炭砖显微结构和性能的影响[J]. 材料导报, 2019, 33(11): 1831-1835.
WANG Tongsheng, LI Yawei, SANG Shaobai, XU Yibiao, WANG Qinghu. Impact of the Addition of Thermo-activated Graphite Flake on the Microstructure and Properties of Carbon Blocks for Blast Furnace. Materials Reports, 2019, 33(11): 1831-1835.
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2019, Vol. 33 
