原料组成对多微孔方镁石-镁铁铝复合尖晶石陶瓷显微结构与性能的影响
Effect of Raw Material Composition on Microstructures and Properties of Microporous Periclase-Composite Spinel(Mg(Fe,Al)2O4)Ceramics
陈茜琳 1鄢文 1王晓 2李亚伟1
作者信息
- 1. 武汉科技大学,省部共建耐火材料与冶金国家重点实验室,武汉 430081;武汉科技大学,钢铁工业耐火材料新技术教育部国际合作联合实验室,武汉 430081
- 2. 青海大学化工学院,西宁 810016
- 折叠
摘要
利用原位分解合成法,以轻烧MgO、Fe2O3和A1(OH)3为原料,成功制备了多微孔方镁石-镁铁铝复合尖晶石陶瓷,并研究原料组成对其显微结构与性能的影响.研究结果表明:当理论镁铁铝复合尖晶石含量为0％(质量分数,下同)时,试样中颈部连接形成较少,耐压强度较低;当理论镁铁铝复合尖晶石含量为4％～16％时,试样中生成的液相量增多,物质运输速率加大,形成的颈部连接较多,耐压强度较高;当理论镁铁铝复合尖晶石含量为24％时,试样中镁铁铝复合尖晶石生成带来的体积膨胀增多,增大颗粒间距,颈部连接的形成减少,试样的耐压强度减小.同时,当理论镁铁铝复合尖晶石含量为12％～16％时,多微孔方镁石-镁铁铝复合尖晶石陶瓷具有较高的显气孔率(22.3％～24.6％)、较低的体积密度(2.75～2.80 g/cm3)和较高的耐压强度(100.6～123.1 MPa).
Abstract
In the work,microporous periclase-composite spinel(Mg(Fe,Al)2O4)ceramics was successfully prepared using calcined MgO,Fe2O3 and Al(OH)3 as raw materials by in-situ decomposition synthesis.Meanwhile,the effects of raw material on its microstructures and properties were studied.The results show that when the periclase-composite spinel(Mg(Fe,Al)2O4)content is 0％(mass fraction,the same below),less neck connection form in the sample as well as the compressive strength is low.When the theoretical periclase-composite spinel(Mg(Fe,Al)2O4)content is 4％～16％,the content of the liquid increases and the mass transport accelerates.Then,lots of neck connections form and the compressive strength is high.When the theoretical periclase-composite spinel(Mg(Fe,Al)2O4)content is 24％,the expansion amounts caused by the formation of composite spinel increase so the inter-particle pore size increases and the neck connections decrease.Therefore,the compressive strength of the sample decreases.When the theoretical periclase-composite spinel(Mg(Fe,Al)2O4)content is 12％～16％,microporous periclase-composite spinel(Mg(Fe,Al)2O4)ceramics has excellent comprehensive properties,the apparent porosity of 22.3％～24.6％,the bulk density of 2.75～2.80 g/cm3,the compressive strength of 100.6～123.1 MPa.
关键词
多微孔陶瓷/方镁石-镁铁铝复合尖晶石/原料组成/原位分解合成法/显微结构/耐压强度Key words
microporous ceramics/periclase-composite spinel(Mg(Fe,Al)2O4)/raw material composition/in-situ decomposition synthesis method/microstructure/compressive strength引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据