钛酸钡基铁电陶瓷材料的老化研究

发布时间：2018-04-17 10:39

本文选题：无铅压电陶瓷 + 老化　；参考：《宁波大学》2015年硕士论文

【摘要】：本文通过固相烧结法制备钛酸钡钙无铅压电陶瓷,调研了Mn的不同位置取代掺杂对Ba0.77Ca0.23TiO3(BCT)无铅压电陶瓷老化性能的影响。实验结果表明,B位取代(Ba0.77Ca0.23)Ti0.99Mn0.01O3(BCT-B)陶瓷随着老化时间的增加,在老化10天后有双电滞回线,发生了老化现象,而A位取代(Ba0.77Ca0.23)0.99Mn0.01TiO3(BCT-A)陶瓷在老化10天后,电滞回线没有明显改变,并没有发生老化现象。这是由于B位取代产生氧空位,而A位取代没有产生氧空位。此外,由于老化后缺陷偶极子的定向排列,B位取代的无铅压电陶瓷电学性能发生变化,应变减小,居里温度升高1°C,压电常数d33由91pC/N减小到80pC/N,机电耦合系数kp由22%下降到13%,品质因数Qm由245增加到1500,介电常数和介电损耗也均有减小。本文研究了钛酸钡BaTiO3(BT)的烧结温度,发现药品纯度与烧结时间对陶瓷制备有重要影响。最终发现BT陶瓷在1350°C下保温4小时,其压电性能和铁电性能比较好,根据老化因素的影响,发现BT也有老化现象。同时,发现BT陶瓷有较弱的磁性,是一多铁性材料。此外,本文还成功制备锆钛酸钡钙Ba0.85Ca0.15Zr0.1Ti0.9O3(BCZT),(Ba0.85Ca0.15)(Zr0.1Ti0.9)0.99Mn0.01O3(BCZT-Mn)和(Ba0.85Ca0.15)(Zr0.1Ti0.9)0.99Co0.01O3(BCZT-Co)陶瓷,测量BCZT陶瓷在频率为1Hz下未老化和老化33天后的电滞回线,发现变化很小,没有出现双电滞回线。极化后的BCZT陶瓷介电温谱显示其居里温度为85°C,在32°C时有峰出现,表明此处存在四方-正交相变。BCZT-Mn陶瓷与BCZT-Co陶瓷相比,BCZT-Co陶瓷更容易老化。BCZT-Mn和BCZT-Co陶瓷均有磁性,且不同物质取代其磁性不同。
[Abstract]:In this paper, barium calcium titanate lead-free piezoelectric ceramics were prepared by solid-state sintering. The effects of mn substitution doping on the aging properties of Ba0.77Ca0.23TiO3BCT-based lead-free piezoelectric ceramics were investigated.The experimental results show that the double electric hysteresis loop occurs after 10 days of aging with the increase of aging time, while the electric hysteresis line of Ba0.77Ca0.23Mn0.99Mn0.01Mn0.01O3BCT-A) ceramics does not change obviously after 10 days of aging, and the electric hysteresis line of BCT-BCT-A ceramics is not changed after 10 days of aging, but the electric hysteresis line of Ba0.77Ca0.23Mn0.99Mn0.99Mn0.99Mn0.01TiO3BCT-A) ceramics does not change obviously after 10 days of aging.There was no aging.This is due to the oxygen vacancy generated by the substitution of the B position and the absence of the oxygen vacancy by the substitution of the A position.In addition, due to the change of the electrical properties of the lead-free piezoelectric ceramics replaced by the directionally arranged dipoles at the B position of the defect after aging, the strain decreases.With the increase of Curie temperature by 1 掳C, the piezoelectric constant d33 decreases from 91pC/N to 80pC / N, the electromechanical coupling coefficient Kp decreases from 22% to 13, the quality factor QM increases from 245 to 1500, and the dielectric constant and dielectric loss decrease.The sintering temperature of barium titanate (BaTiO3BTO) was studied. It was found that the purity and sintering time of Batio _ 3O _ 3 had an important effect on the preparation of ceramics.Finally, it was found that the piezoelectric and ferroelectric properties of BT ceramics kept at 1350 掳C for 4 hours were better. According to the influence of aging factors, it was found that BT also had aging phenomenon.At the same time, it is found that BT ceramics have weak magnetic properties and are multi-iron materials.In addition, barium zirconium titanate calcium Ba0.85Ca0.15Zr0.1Ti0.9O3 BCZT-Mn0.85Ca0.15 (0.99Mn0.01O3O3BCZT-Mn) and Ba0.85Ca0.15Ti0.1Ti0.90.99Co0.01O3BCZT-Co) ceramics were successfully prepared. The electric hysteresis of BCZT ceramics was measured after 33 days of unaging and aging at the frequency of 1Hz.The dielectric temperature spectrum of polarized BCZT ceramics shows that the Curie temperature is 85 掳C, and the peak appears at 32 掳C. it indicates that the tetragonal orthorhombic phase transition. BCZT-Mn ceramics are more easily aged than BCZT-Co ceramics. BCZT-Mn and BCZT-Co ceramics have magnetic properties.And the magnetic properties of different substances are different.
【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ174.7

【共引文献】