添加剂BaO对镁铝尖晶石烧结性能的影响  

Influence of BaO doping on the sintered properties of magnesia-alumina

作　　者：郑浩楠 张汪年[1,2] 方燕 邓宁 许欢[1,2] 曾海燕 ZHENG Haonan;ZHANG Wangnian;FANG Yan;DENG Ning;XU Huan;ZENG Haiyan(School of Materials Science and Engineering,Jiujiang University,Jiujiang 332005,China;Jiangxi Province Engineering Research Center of Materials Surface Enhancing&Remanufacturing,Jiujiang 332005,China)

机构地区：[1]九江学院材料科学与工程学院,江西九江332005 [2]江西省材料表面再制造工程技术研究中心,江西九江332005

出　　处：《粉末冶金工业》2024年第2期81-85,共5页Powder Metallurgy Industry

基　　金：国家自然科学基金资助项目(52362008);江西省教育厅科学科学技术研究项目(GJJ201833)。

摘　　要：以氢氧化镁和氧化铝为原料,通过固相烧结法合成镁铝尖晶石,研究添加剂BaO对镁铝尖晶石烧结致密性能的影响。通过XRD、SEM分析添加剂对试样的物相组成、烧结性能和显微结构的影响。研究发现:添加剂BaO的加入可提高镁铝尖晶石烧结后的体积密度和线收缩率,同时可降低其显气孔率,改善烧结性能。随着添加剂BaO加入量的增加,镁铝尖晶石的颗粒先增大后减小。不添加BaO时Ф20 mm×20 mm的圆柱形试样经1600℃×3 h的高温烧结后的线收缩率为6.81%、显气孔率为54.30%、体积密度为1.65 g/cm^(3),当BaO的加入量为0.5%时,线收缩率可达到12.07%、体积密度可达到1.80 g/cm3,同时显气孔率降低至47.56%。因此,当添加剂含量为0.5%时,镁铝尖晶石的烧结性能最佳。With magnesium hydroxide and alumina as raw materials,magnesium alumina spinel was synthesized by solid phase sintering.The effect of additive BaO on the sintering density of magnesia alumina spinel was studied.The effects of additives on the phase composition,sintering property and microstructure of the samples were analyzed by XRD and SEM.The results show that the addition of BaO can increase the bulk density and linear shrinkage of Mg-Al spinel after sintering.At the same time,the apparent porosity can be reduced and the sintering property can be improved.With the increase of additive BaO,the granules of magnesia-alumina spinel increase first and then decrease.The linear shrinkage rate,apparent porosity and volume density of Ф20 mm ×20 mm cylin-drical samples sintered at 1600℃×3 h are 6.81%,54.30%and 1.65g/cm without adding Ba0.When the amount of BaO is 0.5%,the linear shrinkage rate,apparent porosity and volume density of Ф20 mm×20 mm cylindrical samples sintered at 1600℃×3 h are 6.81%,54.30%and 1.65 g/cm respectively.The linear shrinkage rate can reach 12.07%,the volume density can reach 1.80 g/cm',and the apparent porosity can reduce to 47.56%.Therefore,when the additive content is 0.5%,the sintering property of MgAl_(2)O_(4) is the best.

关 键 词：镁铝尖晶石 添加剂 烧结性能 物相组成 显微结构 

分 类 号：TQ175.1[化学工程—硅酸盐工业]