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
郑浩楠 1张汪年 2方燕 1邓宁 1许欢 2曾海燕1
作者信息
- 1. 九江学院材料科学与工程学院,江西九江 332005
- 2. 九江学院材料科学与工程学院,江西九江 332005;江西省材料表面再制造工程技术研究中心,江西九江 332005
- 折叠
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φ20mm×20mm的圆柱形试样经1 600 ℃×3h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/cm3,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.
Abstract
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 stud-ied.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 φ20 mm ×20 mm cylin-drical samples sintered at 1 600 ℃×3 h are 6.81％,54.30％and 1.65g/cm3 without adding BaO.When the amount of BaO is 0.5％,the linear shrinkage rate,apparent porosity and volume density of φ20 mm ×20 mm cylindrical samples sintered at 1 600 ℃×3 h are 6.81％,54.30％and 1.65 g/cm3 respectively.The linear shrinkage rate can reach 12.07％,the volume density can reach 1.80 g/cm3,and the apparent porosity can reduce to 47.56％.There-fore,when the additive content is 0.5％,the sintering property of MgAl2O4 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Key words
magnesia-alumina/doping/sintering property/phase composition/microstructure引用本文复制引用
基金项目
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)
出版年
2024
NETL
NSTL
万方数据