Mg~(2+)掺杂对PZT陶瓷材料介电性能的影响

系统地研究了Mg2+掺杂对PZT材料相结构及介电性能的影响,结果表明:Mg2+的添加阻止了陶瓷晶粒的过分长大,起到了细化晶粒的作用,改善其烧结性能,降低了烧结温度;由于晶格发生畸变,体系的相结构由三方相向四方相过渡;Mg2+的引入使PZT陶瓷材料的红外光谱图明显向高波数的方向移动,并且显著提高了材料的介电常数,有效降低了其介电损耗,使材料的介电性能得到了明显优化。     

一种基于厚膜技术的浮动板调制器的设计

本文设计了一种基于厚膜技术的浮动板调制器,通过试验证明,该调制器具有结构简单、可靠性高、输出波形好,通用性强等优点。     

玻璃基LSCO/PZT/LSCO电容器的制备和铁电性能

采用磁控溅射法制备La0.5Sr0.5CoO3(LSCO)薄膜、sol-gel法制备Pb(Zr0.4Ti0.6)O3(PZT)薄膜,在玻璃和Ti-Al/Si衬底上构架了LSCO/PZT/LSCO电容器,研究了衬底对LSCO/PZT/LSCO电容器结构和铁电性能的影响。研究发现:虽然生长在两种衬底上的PZT薄膜均为钙钛矿结构多晶薄膜,但是,生长在玻璃衬底上的LSCO/PZT/LSCO电容器具有更好的铁电性能。玻璃基LSCO/PZT/LSCO电容器的剩余极化强度(Pr)为28×10–6C/cm2,矫顽电压(Vc)为0.96V;而硅基LSCO/PZT/LSCO电容器的Pr为25×10–6C/cm2,Vc为1.05V。     

Effect of the slurry composition on the piezoelectric properties of PZT ceramics fabricated via materials extrusion 3D printing

Herein, the effect of the binder content in lead zirconate titanate (PZT) slurry has been systematically studied to improve the piezoelectric properties of PZT ceramics prepared via material extrusion 3D printing. For smooth printing, a slurry with a binder concentration ranging from 6 to 12 wt% was proposed. The porosity of the green body first decreased and then increased with an increase in the binder concentration, and the minimum porosity was obtained when the binder concentration reached 10 wt%. Samples with increased density were obtained after debinding and lead-rich atmosphere sintering. PZT piezoceramics fabricated using a binder content of 10 wt% exhibit the maximum relative density (96.9%), largest piezoelectric constant (342.6 pC/N) and dielectric constant (1621). Based on the above process, the wood pile structure and helical twentytetrahedral structural components were successfully fabricated using the material extrusion process. This research lays the foundation for the engineering application of 3D printing to fabricate high-performance piezoceramics with complex shapes.     

CVD金刚石切削工具

阐述金刚石切削工具在机加工中的重要作用和CVD金刚石的优异性能以及CVD金刚石切削工具的形式。对CVD金刚石薄膜切削工具和CVD金刚石厚膜切削工具的特点和应用范围进行了分析对比，并指出存在问题和发展前景。     

低温制备Pb(Zr0.52Ti0.48)O3铁电薄膜及其性能研究

采用脉冲激光沉积技术（PLD）在（100）p-Si衬底上,低温淀积、快速退火成功地制备了具有完全钙钛矿结构的多晶PZT铁电薄膜,所制备的PZT铁电薄膜致密、均匀,表现出良好的介电和铁电性能,其介电常数和介电损耗100kHz下分别为320和0.08,剩余极化Pr和矫顽场Ec分别为14μC/cm^2和58kV/cm,＋5V电压下漏电流密度低于10^-7A/cm^2。10^7次极化反转后剩余极化仅下降10％,具有较好的疲劳特性。     

压电薄膜喷流泵研究

将压电流体驱动技术和仿生技术、喷流推进技术结合,提出了一种新型的压电喷水推进装置,并对该装置的核心部件—压电喷流泵进行了研究。详细分析和介绍了泵的结构及工作原理,设计制作了实验用样机,并进行了性能测试。实验测试表明,该泵工作性能稳定,喷流量大,在正弦信号激励下,电压为190 V,工作频率为140 Hz时,最大喷流量可达到714 ml/min。     

压电驱动精密直线步进电机研究

提出一种新型的定子主动箝位方式压电精密直线步进电机,解决了压电驱动电机箝位不牢固、步进频率较低、行程小、速度低等问题。研制的精密电机能够实现高频率(100Hz),高速度(30mm/min),大行程(>20mm),高精度,大驱动力(100N)等特点,大幅度提高了压电型步进电机的驱动性能。研制的该步进电机在精密运动、微操作、光学工程、精密定位等精密工程中具有一定的应用价值。     

Qualitative analysis of PZT (52/48) MPB using different synthesis methods

The current work reports a comparison between the structural and optical attributes of PZT (52/48) powder and thin film prepared via solid-state reaction and sol-gel spin-coating technique, respectively. The two obtained PZT samples, PZT-I corresponding to powder which was calcined at 875°C for 2 h, and PZT-II corresponding to a thin film which was annealed at 650°C for 2 h, were investigated via X-Ray Diffraction, Raman Spectroscopy, UV–Vis Spectroscopy, and SEM analysis. The diffraction spectra suggested the creation of a polycrystalline perovskite structure in both the samples. The optical band gap was evaluated using Tauc's relation. The bandgap values were found to be 3.2 eV for PZT-I and 3.87 eV for PZT-II. The bandgap values are significantly different for the PZT materials prepared by the two different methods.