亚毫米级氧化锆陶瓷微珠的制备与表征

以丙烯酰胺体系为基础,以柠檬酸铵(AC)为分散剂,过硫酸铵(APS)为引发剂,以液体石蜡,催化剂四甲基乙二胺(TEMED)为外部介质体系,将钇稳定氧化锆(YSZ)通过凝胶注模成型工艺制备氧化锆陶瓷微珠。采用热分析仪、X-射线衍射仪、扫描电子显微镜、阿基米德排水法等测试手段分别对烧成过程的物理化学变化、物相组成、显微结构、烧成线收缩率和致密度等进行了表征。结果表明:氧化锆微珠生坯在260~600℃进行排胶,整个烧成过程质量减少约16.5%;在1525℃下,样品晶粒发育良好;同时,AM含量为1%~5%时,获得烧成线收缩率平均为22.4%、对应相对体积密度平均为97.5%、表面光滑、球形度好、颗粒尺寸集中于0.2~0.3mm的氧化锆陶瓷微珠,具有良好的性能。

Preparation and Characterization of Submillimeter Ceramic Microspheres for Zirconia

Based on the acrylamide system,using ammonium citrate(AC)as the dispersant,ammonium persulfate(APS)as the initiator,liquid paraffin,catalyst tetramethylethylenediamine(TEMED)as the external medium system,yttrium-stabilized zirconium oxide(YSZ)as raw materials,zirconia ceramic microspheres were prepared by gelcasting.The physical and chemical reactions during sintering,phase,microstructure,sintering linear shrinkage and density of microspheres were characterized by DTA-TG,XRD,SEM,Archimedes method and so on,respectively.The results show that the binders of zirconia microspheres green body removed at 260~600℃,and the mass decreases by about 16.5%in the course of sintering;grains of the sample are well developed at 1525℃;meanwhile,the surface smooth,high sphericity zirconium ceramic microspheres of relative bulk density of 97.5%,linear shrinkage rate of 22.4%on average and the particle size of 0.2~0.3 mm are obtained with good performance.