镁铝尖晶石基多孔陶瓷的制备与表征  

Preparation and Characterization of Magnesium Aluminium Spinel Based Porous Ceramics

作　　者：徐靖文 张锦化[1] 倪月娥[1] 柯昌明[1] 黄蒋磊 单言芳 XU Jingwen;ZHANG Jinhua;NI Yue’e;KE Changming;HUANG Jianglei;SHAN Yanfang(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan,430081,China)

机构地区：[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,湖北武汉430081

出　　处：《盐湖研究》2025年第1期74-80,共7页Journal of Salt Lake Research

基　　金：国家自然科学基金青海联合基金重点项目(U21A2058)。

摘　　要：以水氯镁石和铝酸钠为原料,通过反应共沉淀法制备了不同成分的氢氧化物前驱体粉体,并以之为原料制备镁铝尖晶石基多孔陶瓷材料,研究前驱体成分对多孔陶瓷结构与性能的影响。研究表明:前驱体粉体由Mg_(4)Al_(2)(OH)_(14)·3H_(2)O、Al(OH)_(3)组成,随着反应时间的延长,前驱体中Al(OH)_(3)的含量增加。通过控制反应时间,可制得不同n(Al_(2)O_(3)/MgO)的混合氢氧化物前驱体粉体。在1300~1500℃烧成后,可制得显气孔率为18%~64%、耐压强度为212~14MPa的多孔陶瓷。随着前驱体粉体中n(Al_(2)O_(3)/MgO)的增加,经同一温度烧成后,多孔陶瓷材料的显气孔率增加,体积密度下降,强度增加。随着烧成温度提高,多孔陶瓷材料的显气孔率下降,强度增加。混合氢氧化物前驱体粉体分解过程中形成的细小晶粒具有较高烧结活性,制得的多孔陶瓷材料具有较高强度。Magnesium aluminium spinel based porous ceramics were prepared from the hydroxide precursors which were synthesized by reaction co-precipitation method using bischofite and sodium aluminate as raw materials.The effect of the precursors composition on the porous ceramics was investigated.The results showed that the precursors composed by Mg_(4)Al_(2)(OH)_(14)·3H_(2)O、Al(OH)_(3),and the content of Al(OH)_(3) increased with the extension of reaction time.The mixed hydroxide precursors with different n(Al_(2)O_(3)/MgO)can be prepared by controlling the reaction time.The porous ceramics with apparent porosity of 18%~64%and compressive strength of 212~14 MPa can be obtained after sintering the precursors at 1300~1500℃.With the increase of n(Al_(2)O_(3)/MgO)in the precursor powder,the apparent porosity of porous ceramic increases,the bulk density decreases,and the strength increases.With the increase of sintering temperature,the apparent porosity of porous ceramic material decreases and the strength increases.The fine grains formed during the decomposition of the mixed hydroxide precursor powder have higher sintering activity,and the porous ceramic materials produced have higher strength.

关 键 词：尖晶石基多孔陶瓷 共沉淀反应 氢氧化物前驱体 孔径分布 

分 类 号：TQ174[化学工程—陶瓷工业]