球磨制备高烧结活性Y2O3粉体及其在YAP陶瓷中的应用
Preparation of High Sintering Active Y2O3 Powder by Ball Milling and Its Application for YAP Ceramics
顾军毅 1范武刚 2张兆泉2
作者信息
- 1. 中国科学院上海硅酸盐研究所,上海 200050;景德镇陶瓷大学材料科学与工程学院,江西景德镇 333403
- 2. 中国科学院上海硅酸盐研究所,上海 200050
- 折叠
摘要
Y2O3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Y2O3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3h球磨处理可使平均粒径从3～5μm减小到0.8 μm左右.球磨6 h后粉体粒径减小至0.5 µm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Y2O3粉体和纳米Y2O3为原料分别制备YAlO3(YAP)陶瓷,两者均可在1650 ℃下获得致密度大于93％的YAlO3(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.
Abstract
Yttrium oxide(Y2O3)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(Si3N4)ceramics.Its particle size distribution has a critical impact on material proper-ties.In this paper,the influence of ball milling time on particle size distribution,specific surface area and dis-persion of Y2O3 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-milling-time.The results show that the average particle size can decrease from 3～5 µm to about 0.8 μm after 3 h ball milling.After ball milling for 6 h,the particle size of the powder reduces to about 0.5 µm,and the dispersion of the particles is improved.The particle size and morphology vary little after milling for 9 h,and further exten-sion of milling time might lead to powder agglomeration.The residual large particles can be removed by precipi-tation grading of the slurry after ball grinding to achieve a more uniform particle size distribution.For compari-son,YAlO3(YAP)ceramics were prepared by using ball-milled Y2O3 powder and nano Y2O3,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 ceram-ics.The tests in static 360 ℃ water indicate that the YAP ceramics prepared by solid sintering method show ex-cellent anti-corrosion performance.
关键词
行星球磨/Y2O3/粉体粒度/烧结活性/YAP陶瓷/亚临界水腐蚀Key words
planetary ball-milling/Y2O3/powder particle size/sintering activity,YAP ceramics/subcritical watercorrosion引用本文复制引用
基金项目
国家重大科技专项基金项目(2017ZX06002004)
出版年
2024
NETL
NSTL
万方数据