中空骨料对轻质MgO-MgAl_(2)O_(4)-C耐火材料力学性能的影响  

Effect of hollow aggregate on mechanical properties of lightweight MgO-MgAl_(2)O_(4)-C refractories

作　　者：黄科 殷超凡 王黎 于仁红[1] 董宾宾 臧云飞 梁艳晨 李满仓 秦峰 Huang Ke;Yin Chaofan;Wang Li;Yu Renhong;Dong Binbin;Zang Yunfei;Liang Yanchen;Li Mancang;Qin Feng(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471000,Henan,China;不详)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471000 [2]洛阳理工学院材料科学与工程学院,河南洛阳471023 [3]河南省绿色建筑材料制造与智能装备重点实验室,河南洛阳471023

出　　处：《耐火材料》2025年第1期38-44,共7页Refractories

基　　金：国家自然科学基金资助项目(51972099,52202064);河南省自然科学基金(232300420329);河南省高等学校重点研究项目(23B430012);河南省重点研发专项(No.231111230300);河南省研究生教育改革与质量提升工程项目(YJS2023JD56);河南省高等学校重点科研项目计划(22A430028);洛阳市重大科技创新专项(No.2301009A)。

摘　　要：为了有效降低内衬材料的热量损失,保持钢液温度稳定,以高纯电熔镁砂、自制镁铝尖晶石中空骨料、α-Al_(2)O_(3)微粉、镁铝尖晶石粉、Si粉、Al粉和鳞片石墨为主要原料,以热固性酚醛树脂为结合剂,经1 200℃和1 400℃埋碳热处理制备了MgO-MgAl_(2)O_(4)-C耐火材料。探究了自制镁铝尖晶石中空骨料加入量(加入质量分数分别为0、3%、6%、9%)对轻质MgO-MgAl_(2)O_(4)-C耐火材料力学性能的影响。结果表明:经1 200℃热处理后试样中有SiC和AlN产生,升温至1 400℃时生成了片状MgAlON。随着镁铝尖晶石中空骨料加入量的增加,试样的显气孔率上升,体积密度下降。当热处理温度为1 400℃时,加入6%(w)镁铝尖晶石中空骨料试样的常温抗折强度和耐压强度均达到最大值,分别为14.8 MPa和121 MPa,抗折强度保持率高达80%。中空骨料的引入改变了应力分布方向,形成了不同的耗散机制,实现了对材料的增强增韧。In order to effectively reduce the heat loss of lining materials and maintain a stable molten steel temperature,MgO-MgAl_(2)O_(4)-C refractories were prepared using high purity fused magnesia,self-made magnesium-aluminate spinel hollow aggregates,α-Al_(2)O_(3) micropowder,magnesium-aluminate spinel powder,Si powder,Al powder and graphite as main raw materials,and thermosetting phenolic resin as the binder,heat-treating at 1 200 or 1 400 ℃ in the carbon embedded condition.The effect of the self-made magnesium-aluminate spinel hollow aggregates addition(0,3%,6%,and 9%,by mass) on the mechanical properties of lightweight MgO-MgAl_(2)O_(4)-C refractories was investigated.The results show that SiC and AlN are formed in the sample heat-treated at 1 200 ℃.Up to 1 400℃,plate-like MgAlON is found.With the increase of the magnesium-aluminate spinel hollow aggregates addition,the apparent porosity of the sample increases and the bulk density decreases.When the heat-treating temperature is 1 400 ℃,the sample with 6% magnesium-aluminate spinel hollow aggregates has the highest cold modulus of rupture and the cold crushing strength of 14.8 MPa and 121 MPa,respectively,and the modulus or rupture retention radio reaches 80%.The introduction of hollow aggregates changes the stress distribution direction and forms different dissipative mechanisms to strengthen and toughen the materials.

关 键 词：MgO-MgAl_(2)O_(4)-C耐火材料 中空骨料 MgAl_(2)O_(4) 力学性能 

分 类 号：TQ175[化学工程—硅酸盐工业]