含不同形貌碳的C/MgO复合粉对低碳MgO-C耐火材料性能影响  

Effects of C/MgO composite powders with different morphologies of carbon on properties of low-carbon MgO-C refractory materials

作　　者：丁冬海 关越 李国丹 肖国庆[1] DING Donghai;GUAN Yue;LI Guodan;XIAO Guoqing(College of Material Science and Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,Shaanxi,China;Xi′an Chaoma Technology Ltd.,Xi′an 710025,Shaanxi,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,陕西西安710055 [2]西安超码科技有限公司,陕西西安710025

出　　处：《钢铁研究学报》2024年第10期1298-1307,共10页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(52272027,52372034);陕西省重点研发计划资助项目(2023-GHZD-51,2022GY-421);咸阳市重大科技创新专项资助项目(L2023-ZDKJ-QCY-SXGG-GY-003)。

摘　　要：将燃烧合成的C/MgO复合粉(CN0)以及CNTs/MgO复合粉(CN1)分别加入低碳MgO-C耐火材料中,对比含不同形貌碳的复合粉对低碳MgO-C耐火材料的强化效果,研究了C/MgO复合粉对低碳MgO-C耐火材料体积密度、显气孔率、耐压强度、抗折强度、抗氧化性、抗热震性和抗渣性的影响。结果表明:复合粉的添加可以降低耐火材料的显气孔率,其中添加CNTs/MgO复合粉的试样CM6的显气孔率(12.5%)比空白试样CM0的显气孔率(13.6%)降低8.1%,比添加C/MgO复合粉的试样M6降低8.8%。此外,添加CNTs/MgO复合粉对耐火材料的抗热震性及残余强度改善程度较大,M6具有最高的残余强度保持率但残余强度最低,CM6具有最高的残余强度(2.5 MPa),比CM0(2.2 MPa)高13.6%。添加CNTs/MgO复合粉的低碳MgO-C试样的抗渣侵蚀性能提高,侵蚀指数最佳为1.09,较CM0减小21.6%,较M6减小6.0%。添加CNTs/MgO复合粉可以提高耐火材料的抗氧化性,CM6的氧化系数为56.44%,与CM0相比降低了11.81%。The combustion synthesized C/MgO composite powder(CN0)and CNTs/MgO composite powder(CN1)were added to the low carbon MgO-C refractories,and the enhancement effects of composite powders with different morphologies of carbon on low-carbon MgO-C refractories were compared.The effect of composite powders on bulk density,apparent porosity,cold crushing strength,cold modulus of rupture,oxidation resistance,thermal shock resistance and slag resistance of low carbon MgO-C refractories was studied.The results show that the addition of the composite powder can reduce the apparent porosity of the refractories,where the apparent porosity of the specimen CM6(12.5%)with CNTs/MgO composite powder added is 8.1%lower than that of the reference specimen CM0(13.6%)and 8.8%lower than that of C/MgO composite powder added specimen M6.In addition,the addition of CNTs/MgO composite powder significantly improves the thermal shock resistance and residual strength of the refractories,where M6 shows the highest residual strength ratio but the lowest residual strength and CM6 presents the highest residual strength(2.5 MPa),which is 13.6%higher than that of CM0(2.2 MPa).Meanwhile,the slag resistance of low carbon MgO-C samples with CNTs/MgO composite powder added is improved,with the best corrosion index of 1.09,which is 21.6%less than CM0 and 6.0%less than M6.The addition of CNTs/MgO composite powder can improve the oxidation resistance of refractory materials.The oxidation index of CM6 is 56.44%,which is 11.81%lower than that of CM0.

关 键 词：低碳MgO-C耐火材料 C/MgO复合粉 燃烧合成 强化效果 

分 类 号：TQ175.1[化学工程—硅酸盐工业]