添加热氧化鳞片石墨对高炉炭砖显微结构和性能的影响

doi:10.11896/cldb.18050043

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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.

Key words： thermo-activated graphite flake thermal conductivity hot metal erosion resistance carbon blocks

Published: 21 May 2019

CLC number:

TQ175

Fund:This work was financially supported by the National Natural Science Foundation of China (51574186).

About author:: Tongsheng Wang received his bachelor degrees in June 2014 from Wuhan University of Science and Technology. From 2014 up to now, he studies at Wuhan University of Science and Technology for doctor degree, focusing on the development of high-performance carbon blocks for blast furnace.Yawei Li, dean of school of science and technology development in Wuhan University of Science and Techno-logy. He mainly focuses on the development of high-techniques ceramics and refractories, fracture theory of refractories. He has presided over and participated in the National 973 Special Project, the 863 Program Key Project, the National Natural Science Foundation, and the National Science and Technology Research Project. He has published more than 150 research papers in domestic and foreign academic journals, among which nearly 100 have been included by SCI, EI and ISTP.

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Cite this article:

WANG Tongsheng,LI Yawei,SANG Shaobai, et al. Impact of the Addition of Thermo-activated Graphite Flake on the Microstructure and Properties of Carbon Blocks for Blast Furnace[J]. Materials Reports, 2019, 33(11): 1831-1835.

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http://www.mater-rep.com/EN/10.11896/cldb.18050043 OR http://www.mater-rep.com/EN/Y2019/V33/I11/1831

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