铌酸钾钠基透明陶瓷添加纳米复合烧结助剂的显微结构及性能  

Microstructure and properties of KNN-based transparent ceramics doping the nanocomposite sintering aids

作　　者：王宇洁 陈娜 王舒婷 严云云[1] 肖琳莹 李艳阳 赵微微[1] 姜红波[1] 程花蕾[1] WANG Yu-jie;CHEN Na;WANG Shu-ting;YAN Yun-yun;XIAO Lin-ying;LI Yan-yang;ZHAO Wei-wei;JIANG Hong-bo;CHENG Hua-lei(College of Chemistry and Chemical Engineering,Baoji University of Arts and Science,Baoji 721013,Shaanxi,China)

机构地区：[1]宝鸡文理学院化学与化工学院,陕西宝鸡721013

出　　处：《宝鸡文理学院学报（自然科学版）》2024年第3期22-28,共7页Journal of Baoji University of Arts and Sciences(Natural Science Edition)

基　　金：国家自然科学基金青年项目(21501007);陕西省科技厅自然科学项目(2019JQ-897);陕西省重点研发计划项目资助(2020KW-041);陕西省留学人员科技活动择优资助项目(2020013);国家级大学生创新创业项目(2018XJ038;201827014)。

摘　　要：目的研究铌酸钾钠(KNN)基透明陶瓷掺杂适量纳米复合烧结助剂后的微观结构和性能,揭示其对KNN基陶瓷透过率的影响规律。方法采用溶胶-凝胶法制备Zn-B-Si-O(ZBS)纳米复合烧结助剂,固相法制备KNN-0.03CZN-x ZBS无铅压电陶瓷,研究纳米复合烧结助剂掺杂量对KNN基透明陶瓷的影响。结果溶胶-凝胶法制备分散均匀且粒径30 nm的ZBS复合烧结助剂的最佳实验条件是:煅烧温度为400℃,溶胶的pH值为2。KNN-0.03CZN陶瓷最优烧结温度由未掺杂纳米ZBS复合烧结助剂时1140℃(4.50 g/cm^(3)),降低为掺杂量x=1.50 wt%时的900℃(4.57 g/cm^(3)),明显随着纳米ZBS复合烧结助剂掺杂量的增大,KNN基透明陶瓷最优烧结温度下降240℃,且陶瓷晶粒呈规则的立方体,晶粒大小均匀,晶粒间气孔较少,陶瓷的致密性较好。在可见光和近红外范围内,KNN-0.03 CZN-1.00ZBS陶瓷具有高致密性(98%)和透过率(25.68%,27.54%),以及良好的电性能(ε_(r)=2518,tanδ=0.02,T_(c)=270℃,P_(r)=6.88μC/cm^(2),E_(c)=8.49 kV/cm)。结论适量复合烧结助剂在低温烧结下有效改善KNN-0.03CZN陶瓷的致密性,提高透明陶瓷透过率。Purposes—To investigate the structure and properties of transparent KNN-based ceramics doped with the nanocomposite sintering aids.Methods—Zn-B-Si-O(ZBS)nanocomposite sintering aid was prepared with sol-gel method and ZBS nanocomposite doped with KNN lead-free piezoelectric ceramics were prepared with solid-state method.The effect of doping amount of nanocomposite sintering aids on the density,microstructure,phase structure and properties of transparent KNN ceramics was studied.Results—The calcination temperature of ZBS nanocomposite sintering aids prepared with sol-gel method is 400℃,and the particle size of ZBS nanocomposite powder which is prepared when the pH of sol is 2 is the smallest(30 nm),and it is evenly dispersed.The optimal sintering temperature for KNN-0.03CZN ceramics when nano ZBS sintering aid isn't doped with is 1140℃(4.50 g/cm^(3)).When the nano ZBS sintering aid x=1.50 wt%,the optimal sintering temperature for KNN-0.03 CZN ceramics is 900℃(4.57 g/cm^(3)).It is evident that as the doping amount of nano ZBS sintering aid increases,the optimal sintering temperature decreases by 220℃.The ceramic grains are regular cubic and is characterized by uniform grain size,fewer intergranular pores and better density.KNN-0.03 CZN-1.00ZBS exhibited high density(98%),high transmittance(34.02%and 39.33%)in the visible light range and near-IR region and respectively good electrical properties(ε_(r)=2518,tanδ=0.02,P_(r)=6.88μC/cm^(2),E_(c)=8.49 kV/cm).Conclusions—The use of nano sintering aids can better promote ceramic sintering and increase the density of ceramics and transmittance of transparent ceramics.

关 键 词：铌酸钾钠 相结构 微观形貌 电性能 

分 类 号：TB34[一般工业技术—材料科学与工程]