【作者】 朱宏亮；

【导师】 孙清池；

【作者基本信息】 天津大学 ， 材料学， 2005， 硕士

【摘要】 为了降低PZT压电陶瓷的烧结温度,同时提高其综合性能,本论文以固态氧化物为原料,通过添加具有改性作用的低熔点化合物PbO·WO₃,采用一次合成工艺制备PZT-PbO·WO₃压电陶瓷。陶瓷材料在较低温度下实现液相烧结,液相烧结的过程有利于晶粒的致密化,提高材料的体积密度。实验主要研究PbO·WO₃含量、准同型相界附近锆含量对陶瓷介电性能、压电性能、居里温度的影响,然后在此基础上进行了烧结温度、保温时间、极化工艺对材料性能影响的研究。粉末在900℃合成并保温2h,得到钙钛矿结构。研究发现:PbO·WO₃最佳掺杂量为0.5% , Zr含量为52%时材料处于准同型相界内;Pb_1.05(Zr_0.52Ti_0.48)O₃- 0.5mol%（5PbO·WO₃）压电陶瓷在1100℃保温时间为2小时条件下烧结而成,在120℃硅油中,2500V/mm场强下持续极化30分钟,样品达最佳性能。测得的最佳性能参数为:介电常数ε33T/ε0=1593,介电损耗tanδ=0.019,压电系数d₃₃=363PC/N ,机电耦合系数KP=0.60,机械品质因数Qm=66,电阻率ρ_v=5.65×10¹²Ω·cm,居里温度T_c=361-367℃。通过和传统温度（1260℃）下烧结而成的PZT压电陶瓷综合性能的比较,本实验不仅降低了其烧结温度,而且提高了材料的综合性能。论文后期对陶瓷的低温液相烧结和改性原理进行了深入地探讨。本文通过X射线衍射（XRD）对合成后材料的晶相进行了分析;用扫描电子显微镜（SEM）观察样品表面的显微结构。更多还原

【Abstract】 In order to abate the sintered temperature of piezoelectric ceramics and improve its complex capability, the material is doped by low melting point chemical compound PbO·WO3.As a result, ceramic materials can be sintered at 1100℃in liquid phase. This process is in favor of improving the densification of grain. In the paper, PZT-0.5%PbO·WO3 piezoelectric ceramic were prepared by using one-stage technique with solid oxides as raw materials. The effects of PbO·WO₃ contents, Zr contents, sintering temperature, soaking time and polarize technology on properties of ceramic was studied. The results showed that pure perovskitic structure was obtained at calcination of 900℃for 2h. It exhibited a well-situated property at morphotropic phase boundary when Zr content is 0.52 and PbO·WO₃ content is 0.5mol%. Pb_1.05(Zr_0.52,Ti_0.48)O₃-0.5mol%（5PbO·WO₃） piezoelectric ceramic is sintered at 1110℃for 2h and polarized under 2500V/mm of electric field in 120℃for 30min.The optimized results ofε33T/ε0 （1593）,tanδ（0.019）,d33 （363PC/N）, Kp （0.60）,Qm （66）,ρv（5.65×1012Ω·cm） and Tc（361-367℃） were obtained. In comparison of the properties of PZT sintered at traditional temperature（1260℃）, this experiment abate the sintering temperature and improve its complex capability. In the final paper, there have a profound research on the principle of low temperature sintering and improving properties.In the paper, XRD is used to analyze the lattice structure of synthetic power, SEM is used to observe the surface of the ceramic.更多还原