Property optimization of magnesium aluminate spinel based on orthogonal design

doi:10.3969/j.issn.1001-1935.2025.03.003

Abstract

Abstract: To investigate the influence of various factors on their properties and optimize the preparation process,magnesium aluminate spinel refractory materials were prepared with magnesium aluminate spinel particles,fine powder and micropowder as raw materials,methacrylamide as the monomer,N,N′-methylenebisacrylamide as the crosslinker,ammonium persulfate as the initiator,and N,N′-tetramethylethylenediamine as the catalyst through gel casting.The effects of the gel drying temperature (50,70 and 90 ℃),the initiator addition (0.5%,1.0% and 1.5%,by mass),the catalyst addition (0.3%,0.5% and 0.7%,by mass),and the monomer to crosslinker mass ratio (3∶1,5∶1 and 10∶1) on the properties and structure of the samples were investigated by an orthogonal test,with particular emphasis on their impact on the cold compressive strength.The results indicate that the influence of various factors on the cold compressive strength follows this order:initiator addition>drying temperature>monomer to crosslinker mass ratio>catalyst addition.Considering the apparent porosity of the samples,the optimal process parameters are determined:the drying temperature of 90 ℃,the initiator addition of 1.0%,the catalyst addition of 0.3% and the monomer to crosslinker mass ratio of 10∶1,and the obtained magnesium aluminate spinel material exhibits a bulk density of 2.80 g·cm^-3,an apparent porosity of 15.5%,a cold compressive strength of 5.29 MPa,and a linear shrinkage rate of 0.55%.

Key words: magnesium aluminate spinel, gel casting, microstructure, mechanical properties

摘要： 为了研究各因素对凝胶成型镁铝尖晶石耐火材料性能的影响以优化制备工艺,以镁铝尖晶石颗粒、细粉以及微粉为原料,甲基丙烯酰胺为单体、N,N′-亚甲基双丙烯酰胺为交联剂、过硫酸铵为引发剂、N,N′-四甲基乙二胺为催化剂,通过凝胶浇注成型制备了镁铝尖晶石材料。采用正交试验研究了凝胶干燥温度(50、70、90 ℃)、引发剂加入量(加入质量分数分别为0.5%、1.0%、1.5%)、催化剂加入量(加入质量分数分别为 0.3%、0.5%、0.7%)、单体与交联剂的质量比(3∶1、5∶1、10∶1)对试样性能和结构的影响,重点分析了各因素对试样常温耐压强度的影响。结果表明:各因素对试样常温耐压强度影响顺序为:引发剂加入量>干燥温度>单体与交联剂的质量比>催化剂加入量,结合试样的显气孔率,确定出最优工艺参数为干燥温度90 ℃、引发剂加入量1.0%(w)、催化剂加入量0.3%(w)、单体与交联剂质量比10∶1,制得镁铝尖晶石材料的体积密度、显气孔率、常温耐压强度和线收缩率分别为2.80 g·cm^-3、15.5％、5.29 MPa、0.55%。

关键词: 镁铝尖晶石, 凝胶成型, 显微结构, 力学性能

CLC Number:

TQ175

Cheng Qingnan, Qian Kun, Chen Bo, Wang Jianjun, Liu Kui. Property optimization of magnesium aluminate spinel based on orthogonal design[J]. Refractories, 2025, 59(3): 198-202.

程庆楠, 潜坤, 陈波, 王建军, 刘奎. 基于正交设计优化镁铝尖晶石性能[J]. 耐火材料, 2025, 59(3): 198-202.

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