锆英石加入量对低碳镁碳砖抗剥落性能的影响

doi:10.3969/j.issn.1001-1935.2023.06.010

耐火材料 ›› 2023, Vol. 57 ›› Issue (6): 508-513.DOI: 10.3969/j.issn.1001-1935.2023.06.010

锆英石加入量对低碳镁碳砖抗剥落性能的影响

郑俊国¹⁾, 赵伟²⁾, 黄奥³⁾, 顾华志³⁾, 孙春晖²⁾颜浩²⁾, 刘靖轩²⁾, 赵现堂²⁾

1)山西太钢不锈钢股份有限公司炼钢二厂山西太原 030003
2)北京利尔高温材料股份有限公司北京 102211
3)武汉科技大学湖北武汉 430081

收稿日期:2023-07-07 发布日期:2023-12-25
通讯作者: 赵伟,男,1983年生,硕士。 E-mail:zhaow@bjlirrc.com
作者简介:郑俊国:男,1976年生,工程师。E-mail:695689898@qq.com

Effect of zircon addition on spalling resistance of low-carbon MgO-C bricks

Zheng Junguo, Zhao Wei, Huang Ao, Gu Huazhi, Sun Chunhui, Liu Jingxuan, Yan Hao, Zhao Xiantang

First author's address: The Second Steelmaking Plant of Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan 030003,Shanxi,China

Received:2023-07-07 Published:2023-12-25

摘要/Abstract

摘要： 为了提高VOD钢包用低碳镁碳砖的抗剥落性能,以粒度为5~3、3~1、＜1和＜0.088 mm的电熔镁砂,粒度＜0.15 mm的天然鳞片石墨,粒度＜0.045 mm的金属铝粉和粒度＜0.05 mm的锆英石粉为主要原料,热固性酚醛树脂为结合剂,制备了低碳镁碳砖,研究了锆英石加入量(加入质量分数分别为0、1%、2%、5%)对低碳镁碳砖抗剥落性能的影响。结果表明:1)添加1%(w)锆英石试样的高温抗折强度、抗热震性、抗氧化性及抗渣性均达到最大,说明锆英石的加入有助于提高低碳镁碳砖的抗剥落性能。2)添加锆英石的试样经1 400 ℃埋碳加热0.5 h后,基质中有针状、连续片状空间结构的阿隆(AlON)以及片状氧化铝-氧化锆复合物生成,且通过钉扎增韧以及颗粒增韧提高了高温力学性能和抗热震性。3)加入过量的锆英石会导致氧化锆生成量明显增加,其高温下的体积变化使基质中微裂纹聚集,造成试样的抗剥落性能大幅下降。

关键词: 低碳镁碳砖, 锆英石, 抗剥落性

Abstract: In order to improve the spalling resistance of low-carbon MgO-C bricks for VOD ladles,the low-carbon MgO-C bricks were prepared using fused magnesia (5-3,3-1,＜1 and ＜0.088 mm),natural flaky graphite (<0.15 mm),metallic aluminum powder (<0.045 mm),and zircon powder (<0.05 mm) as main raw materials,thermosetting phenolic resin as the binder.Effects of zircon additions (0,1%,2%,and 5%,by mass) on the spalling resistance of low-carbon MgO-C bricks were studied.The results show that:(1)the hot modulus of rupture,thermal shock resistance,oxidation resistance and slag resistance of the sample with 1% zircon all reach the maximum,indicating that the addition of zircon helps to improve the spalling resistance of low-carbon MgO-C bricks;(2)AlON of needle-like and continuous flaky spatial structure and flaky Al₂O₃-ZrO₂ composite form in the matrix after being heated at 1 400 ℃ for 0.5 h in carbon embedded condition,which enhances the high temperature mechanical property and thermal shock resistance due to the effect of pinning toughening and particle toughening;(3)excessive zircon results in a substantial increase in zirconia,whose volume change at high temperatures leads to the aggregation of micro-cracks in the matrix,resulting in a significant decline in the anti-spalling property of low-carbon MgO-C bricks.

Key words: low-carbon MgO-C bricks, zircon, anti-spalling property

中图分类号:

TQ175

郑俊国, 赵伟, 黄奥, 顾华志, 孙春晖颜浩, 刘靖轩, 赵现堂. 锆英石加入量对低碳镁碳砖抗剥落性能的影响[J]. 耐火材料, 2023, 57(6): 508-513.

Zheng Junguo, Zhao Wei, Huang Ao, Gu Huazhi, Sun Chunhui, Liu Jingxuan, Yan Hao, Zhao Xiantang. Effect of zircon addition on spalling resistance of low-carbon MgO-C bricks[J]. Refractories, 2023, 57(6): 508-513.

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锆英石加入量对低碳镁碳砖抗剥落性能的影响

Effect of zircon addition on spalling resistance of low-carbon MgO-C bricks

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