摘要
选用CaO–SiO2–TiO2作为氧化铝陶瓷的烧结助剂,在空气气氛下经过常压烧结制备Al2O3陶瓷。研究了烧结助剂中CaO质量分数以及烧结温度对Al2O3基微波陶瓷的相组成、微观结构和介电性能的影响。结果表明:添加含CaO烧结助剂的Al2O3陶瓷中,出现了CaAl12O19第二相,相含量随着CaO质量分数的增加而增加;随着烧结助剂中CaO质量分数的增加,Al2O3陶瓷试样介电常数增大,品质因数先升高后降低。随着烧结温度的升高,Al2O3陶瓷相对密度和品质因数先升高后降低,介电常数和谐振频率温度系数增大。当烧结温度为1450℃、烧结助剂中CaO质量分数为0.4%时,烧结体的相对密度达到最大值98.61%,介电常数为9.88,品质因数值为21957GHz,谐振频率温度系数为-21.353×10-6/℃。
Alumina ceramics were prepared by normal pressure sintering in air,using CaO–SiO2–TiO2 as the sintering aid.The effects of CaO content by mass in sintering aid and sintering temperature on phase composition,microstructures,and dielectric properties of Al2O3-based microwave ceramic samples were investigated.The results show that,the second phase of CaAl12O19 appears in the Al2O3 ceramics with CaO addition,and the phase content increases with the increase of CaO content in sintering aid.The dielectric constant of Al2O3 ceramics increases with the increase of CaO content in sintering aid,while the quality factor increases first and then decreases.With the increase of sintering temperature,the relative density and quality factor of Al2O3 ceramics increase first and then decrease,while the dielectric constant and temperature coefficient of resonance frequency keep increasing.The Al2O3 ceramic sintered at 1450 ℃ with the CaO mass fraction of 0.4% in sintering aid presents the superior comprehensive properties,the relative density of the sintered body is 98.61%,the dielectric constant is 9.88,the quality factor is 21957 GHz,and the temperature coefficient of resonance frequency is -21.353×10-6/℃.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2018年第1期9-15,共7页
Powder Metallurgy Technology
基金
国家国际科技合作计划资助项目(2014DFR50570)
关键词
氧化铝陶瓷
烧结助剂
烧结温度
相对密度
介电性能
alumina ceramics
sintering aid
sintering temperature
relative density
dielectric properties
