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

作　　者：郑俊国[1] 赵伟[2] 黄奥[3] 顾华志[3] 孙春晖 颜浩[2] 刘靖轩[2] 赵现堂 Zheng Junguo;Zhao Wei;Huang Ao;Gu Huazhi;Sun Chunhui;Liu Jingxuan;Yan Hao;Zhao Xiantan(The Second Steelmaking Plant of Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan 030003,Shanxi,China;不详)

机构地区：[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

出　　处：《耐火材料》2023年第6期508-513,共6页Refractories

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。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 Al 2O 3-ZrO 2 composite form in the matrix after being heated at 1400℃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.

关 键 词：低碳镁碳砖 锆英石 抗剥落性 

分 类 号：TQ175[化学工程—硅酸盐工业]