摘要
采用化学法结合传统的氧化物固相烧结法制备钛酸锌陶瓷。研究了原料形态和掺杂V2O5和WO3对钛酸锌陶瓷相稳定性、显微组织以及低温烧结行为的影响,讨论了相转变机制和低温烧结机制。研究表明:以V2O5和WO3作为烧结助剂降低陶瓷的烧结温度,钛酸锌陶瓷的低温烧结行为对所选取的原料极为敏感,TiO2的活性对陶瓷低温烧结行为的影响大于ZnO。V2O5和WO3的掺入使钛酸锌陶瓷的烧结温度降至900℃以下,但同时降低了六方相ZnTiO3的分解温度;V2O5和WO3掺杂具有不同的烧结机制,前者主要是液相烧结机制,后者主要是固相反应烧结机制。掺杂导致的相分解和生成的异相降低了陶瓷的介电性能。
Zinc titanate ceramics were prepared by the conventional mixed-oxide method combined with chemical processing. The influences of raw materials and the addition of V2O5 and WO3 on the phase stability, microstructures and low-temperature sintering behavior of ZnTiO3 ceramics were investigated; low-temperature sintering mechanism and phase transition mechanism of zinc titanate ceramics with V2O5 and WO3 addition was discussed. The results show that the low-temperature sintering of ceramics was very sensitive to differences in raw materials, especially for TiO2. The densification temperature of ZnTiO3 ceramics was reduced to 900 ℃ with increasing V2O5 and WO3 addition. Also the phase transition temperature from hexagonal ZnTiO3 phase to cubic Zn2TiO4 was lowered by adding V2O5 and WO3. The low-temperature sintering mechanism of V2O5-doped zinc titanate ceramics was a liquid phase sintering mechanism, while low-temperature sintering of V2O5-doped zinc titanate ceramics can be attributed to a solid phase reactive sintering mechanism. The phase decomposition and the second phase degraded the dielectric properties of V2O5 and WO3 doped ceramics.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2006年第8期1000-1005,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(60501015)
西北工业大学博士论文创新基金(CX200408)资助项目
关键词
化学法
低温烧结
相转变
钛酸锌
液相烧结
chemical processing
low-temperature sintering
phase transition
zinc titanate
liquid phase sintering
