球磨制备高烧结活性Y_(2)O_(3)粉体及其在YAP陶瓷中的应用  

Preparation of High Sintering Active Y_(2)O_(3) Powder by Ball Milling and Its Application for YAP Ceramics

作　　者：顾军毅 范武刚[1] 张兆泉[1] Gu Junyi;Fan Wugang;Zhang Zhaoquan(Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;School of Materials Science and Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,China)

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050 [2]景德镇陶瓷大学材料科学与工程学院,江西景德镇333403

出　　处：《中国稀土学报》2024年第5期1008-1016,I0006,共10页Journal of the Chinese Society of Rare Earths

基　　金：国家重大科技专项基金项目(2017ZX06002004)资助。

摘　　要：Y_(2)O_(3)是制备铝酸钇晶体及稳定氧化锆陶瓷的重要原料,也是SiC和SiN陶瓷体系的主要液相烧结助剂之一,它的粒径分布和烧结活性对材料性能有重要影响。本文采用行星球磨方法,在固定球磨转速、球料比等参数的条件下,采用激光粒度仪、SEM和氮气吸附-脱附等手段研究球磨时间对商业微米级Y_(2)O_(3)粉的粒度分布、比表面积及分散性的影响,考察最佳的球磨时间。结果表明,初始3 h球磨处理可使平均粒径从3~5μm减小到0.8μm左右。球磨6 h后粉体粒径减小至0.5μm左右,同时颗粒的分散性提高。球磨9 h后颗粒的尺寸和形貌变化较小,而继续延长球磨时间可能导致粉体团聚。球磨后的浆料通过进一步的沉淀分级可去除残留的粗颗粒,使粉体粒度分布更加均匀。利用球磨后的Y_(2)O_(3)粉体和纳米Y_(2)O_(3)为原料分别制备YAlO_(3)(YAP)陶瓷,两者均可在1650℃下获得致密度大于93%的YAlO_(3)(YAP)陶瓷。通过优化球磨工艺,微米级氧化钇可以获得与纳米氧化钇相近的烧结活性,避免生成杂相。在360℃静态水中的腐蚀试验表明通过固相烧结制备的YAP陶瓷具有较好的抗亚临界水腐蚀性能。Yttrium oxide(Y_(2)O_(3))is an important raw material for the preparation of yttrium aluminate crystals and stabilized zirconia ceramics.It is also one of the main liquid-phase sintering additives for silicon carbide(SiC)and silicon nitride(Si_(3)N_(4))ceramics.Its particle size distribution has a critical impact on material properties.In this paper,the influence of ball milling time on particle size distribution,specific surface area and dispersion of Y_(2)O_(3) powder was studied by laser particle analyzer,SEM and nitrogen adsorption-desorption under the conditions of fixed ball milling speed and ball to powder weight ratio to investigate the optimal ball-millingtime.The results show that the average particle size can decrease from 3~5μm to about 0.8μm after 3 h ball milling.After ball milling for 6 h,the particle size of the powder reduces to about 0.5μm,and the dispersion of the particles is improved.The particle size and morphology vary little after milling for 9 h,and further extension of milling time might lead to powder agglomeration.The residual large particles can be removed by precipitation grading of the slurry after ball grinding to achieve a more uniform particle size distribution.For comparison,YAlO_(3)(YAP)ceramics were prepared by using ball-milled Y_(2)O_(3) powder and nano Y_(2)O_(3),respectively.Both of these can obtain pure phase YAP ceramic with a relative density of more than 93%after sintering at 1650℃.By optimizing the ball milling processing,micrometer-size yttrium oxide can obtain comparable sintering activity relative to nanometer yttrium oxide powder while avoiding the formation of a heterogenous phase in YAP ceramics.The tests in static 360℃water indicate that the YAP ceramics prepared by solid sintering method show excellent anti-corrosion performance.

关 键 词：行星球磨 Y_(2)O_(3) 粉体粒度 烧结活性 YAP陶瓷 亚临界水腐蚀 

分 类 号：TQ174[化学工程—陶瓷工业] O614.33[化学工程—硅酸盐工业]