Premium
Research on slag‐resistance of ZrN‐SiAl ON ‐SiC‐C composite refractory in different atmospheres
Author(s) -
Cheng Bohao,
Zhang Zhijie,
Wu Xiaowen,
Min Xin,
Huang Zhaohui,
Tao Tianyi,
Zhao Haiqing,
Fang Minghao,
Liu Yangai
Publication year - 2018
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13099
Subject(s) - materials science , composite number , carbothermic reaction , cristobalite , metallurgy , slag (welding) , reducing atmosphere , oxide , scanning electron microscope , composite material , carbide , quartz
The ZrN‐SiAl ON composite powder was synthesized using low‐grade zircon and bauxite by carbothermal reduction nitridation at first and then ZrN‐SiAl ON ‐SiC‐C composite refractory were fabricated with the ZrN‐SiAl ON powder, SiC particles, and a small amount of Si powder as raw materials and sucrose as the binder. The slag resistance of these composites in O 2 , N 2 and Ar atmosphere was investigated by X‐ray diffraction, scanning electron microscopy, and energy dispersion spectra. The results show that the pores in the inside of ZrN‐SiAl ON ‐SiC‐C composite refractory were enlarged in oxygen atmosphere due to oxidation, which leads to the decrease in slag resistance. In argon atmosphere, blast furnace slag destroyed the sintered body of zircon, corundum, and cristobalite with the formation of CaZrO 3 , then infiltrated into and filled the pores inside the refractory to form a dense layer, which hindered the further erosion of the blast furnace slag. In the reducing atmosphere, the interfacial energy of the gas‐liquid phases became larger due to the reactions between blast furnace slag liquid and the gas, resulting in a larger wetting angle which prevented the erosion.