【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。更多还原

【Abstract】 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 titan-ate 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.更多还原