A novel route to enhance high-temperature mechanical property and thermal shock resistance of low-carbon Mgo-C bricks by introducing ZrSiO_(4)  

作　　者：Chun-hui Sun Ling-ling Zhu Hao Yan Wei Zhao Jing-xuan Liu Lin Ren Xian-tang Zhao Xiao-song Tong Shu-wen Yu 

机构地区：[1]Beijing Lirr High-Temperature Materials Co.,Ltd.,Beijing 102211,China [2]School of Materials Science and Engineering,Henan Province Industrial Technology Research Institute of Resources and Materials,Zhengzhou University,Zhengzhou 450001,Henan,China [3]School of Chemistry and Chemical Engineering,Suzhou University,Suzhou 234000,Anhui,China

出　　处：《Journal of Iron and Steel Research International》2024年第6期1436-1448,共13页

基　　金：Enterprise Research and Development Project of Beijing Lirr High-Temperature Materials Co.,Ltd.(2020-02);Key Scientific Research Project for Universities and Colleges in Henan Province(19A430028);the Excellent Youth Research Project of Anhui Province(2022AH030135);the PhD Research Funding of Suzhou University(2021BSK041).

摘　　要：Conventional MgO-C bricks(graphite content>14 wt.%)produce a great deal of greenhouse gas emission,while low-carbon MgO-C bricks have serious thermal shock resistance during high-temperature service.To enhance the high-temperature mechanical property and thermal shock resistance of low-carbon MgO-C bricks,a novel route of introducing ZrSiO_(4) powder into low-carbon MgO-C bricks was reported in such refractories with 2 wt.% flaky graphite.The results indicate that the low-carbon MgO-C brick with 0.5 wt.%ZrSiO_(4) addition has the maximum hot modulus of rupture at 1400℃ and the corresponding specimen fired in the carbon embedded atmosphere has the maximum residual strength ratio(98.6%)after three thermal shock cycles.It is found that some needle-like AlON and plate-like Al_(2)O_(3)-ZrO_(2) composites were in situ formed in the matrices after the low-carbon MgO-C bricks were coked at 1400℃,which can enhance the high-temperature mechanical property and thermal shock resistance due to the effect of fiber toughening and particle toughening.Moreover,CO_(2) emission of the newly developed low-carbon MgO-C bricks is reduced by 58.3% per ton steel after using them as the working lining of a 90 t vacuum oxygen decarburization ladle.

关 键 词：Low-carbon MgO-C brick ZrsiO_(4) Synergistic toughening effect High-temperature mechanical property Thermal shock resistance Vacuum oxygen decarburization ladle 

分 类 号：TQ1[化学工程]