复合镁砂种类配比对大面修补料性能的影响  

Influence of composite magnesia types ratio on the performance of large area repair materials

作　　者：郝春来 于林辉 陈学东 齐鹏远[1,2,3] 赫丽杰 李长生[3] 李洋 Hao Chunlai;Yu Linhui;Chen Xuedong;Qi Pengyuan;He Lijie;Li Changsheng;Li Yang(Liaoning Provincial Engineering Research Center for High Value Utilization of Magnesite,Yingkou Institute of Technology,Yingkou 115014,China;Yingkou Dongbang Environmental Science and Technology Co.,Ltd.,Yingkou 115000,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]营口理工学院辽宁省菱镁矿高值利用工程研究中心,辽宁营口115014 [2]营口东邦环保科技股份有限公司,辽宁营口115000 [3]东北大学材料科学与工程学院,沈阳110819

出　　处：《材料与冶金学报》2024年第6期565-569,共5页Journal of Materials and Metallurgy

基　　金：国家自然科学基金项目(52274376);营口理工学院引进人才科研启动经费项目(YJRC202017);辽宁省教育厅基本科研项目(JYTMS20230064);2024年国家级大学生创新创业训练计划项目(202414435003)。

摘　　要：研制一种高温流动性好、结构强度高、生产工艺简单的新型大面修补料.将烧结镁砂和电熔镁砂经适当的组分配比,并引入硅微粉和活性α-Al_(2)O_(3)微粉作为复合结合剂,羧甲基纤维素钠作为分散剂,木质素磺酸钠作为减水剂,制备转炉修补专用原料.1 100℃和1 500℃高温煅烧后,分析了复合镁砂种类配比对转炉大面修补料的体积密度、显气孔率、吸水率、耐压和抗折等性能的影响.结果表明:当粒径为5~1 mm的98%电熔镁砂占比35%,与粒径为1~0.5 mm的95%烧结镁砂占比18%混合时,经1 500℃煅烧,试样形貌较为致密,且均匀分布细小空隙,并获得最佳综合性能;此时,试样体积密度为2.8 g/cm^(3),显气孔率为16.3%,吸水率为5.8%,重烧线变化率为-0.32%,抗折强度为7.5 MPa,耐压强度为19.7 MPa.A new type of large-surface repair material with good high-temperature fluidity,high structural strength and simple production process was developed.Sintered magnesia and fused magnesia were properly proportioned,and silicon micro-powder and activeα-Al_(2)O_(3) micro-powder were introduced as composite binders,sodium carboxymethyl cellulose as a dispersant,and sodium lignosulfonate as a water reducer to prepare special raw materials for converter repair.After high-temperature calcination at 1100℃and 1500℃,the influence of different magnesia types and proportions on the bulk density,apparent porosity,water absorption,pressure resistance,and flexural strength of the converter large-area repair material was analyzed.The results show that when 98%fused magnesia with a particle size of 5~1 mm accounts for 35%and 95%sintered magnesia with a particle size of 1~0.5 mm accounts for 18%,the sample morphology is relatively dense and fine voids are evenly distributed after sintering at 1500℃,and the best comprehensive properties are obtained.At this time,the bulk density of the sample reaches 2.8 g/cm^(3),the apparent porosity is 16.3%,the water absorption is 5.8%,the linear change rate of reheating is-0.32%,the flexural strength is 7.5 MPa,and the compressive strength is 19.7 MPa.

关 键 词：烧结镁砂 电熔镁砂 修补料性能 

分 类 号：TB321[一般工业技术—材料科学与工程]