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TiO2压敏陶瓷是一种具有压敏电压低、非线性系数大，介电常数高等优异电学行为的半导体功能材料。在低压领域中，在过压保护和消噪、抗浪涌等方面应用日益广泛。本文在对国内外压敏陶瓷研究的历史、现状及前景概述的基础上，对掺杂Ta2O5的TiO2基陶瓷的压敏特性进行了研究。 本设计采用固相烧结法制备了一系列样品。主要研究了不同掺杂量的Ta2O5和不同温度对压敏材料的压敏电压和非线性系数等的影响，并进行了相关的比较分析。主要实验工作及结果如下： （1）研究了Ta2O5掺杂量在0.01mol%--1.0mol%的范围内对TiO2基陶瓷的非线性伏-安特性及介电性能的影响。结果表明：随着Ta2O5掺杂量的持续增加，样品的非线性系数先增后减，其最大值为6，在Ta2O5的掺杂量为0.1 mol%附近时获得；样品介电常数（在1kHz频率下测量）先减后增，其最小值在Ta2O5掺杂量在 0.1mol%附近获得。 （2）研究了不同温度对该样品的压敏特性的影响。研究结果表明：在1250℃~1400℃范围内，随着温度的升高，压敏电压、非线性系数逐渐增加，在1350℃时，样品具有最好的压敏性（V1mA~ 6 ，α~ 6）。 |
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浮云翳月: 金币+140, 翻译EPI+1, ★★★★★最佳答案, 多谢多谢 2013-11-30 22:17:21
浮云翳月: 金币+140, 翻译EPI+1, ★★★★★最佳答案, 多谢多谢 2013-11-30 22:17:21
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TiO2 varistor ceramics is a semiconductor functional material with excellent electrical behaviours such as low varistor voltage, large nonlinear coefficient and high dielectric constant. In low voltage field, it has found ever increasing applications in over voltage protection, noise reduction as well as surge suppression. This paper studies the varistor characteristics of TiO2 based ceramics doped with TA2O5, based on a review of the history, current status and future perspectives of varistor ceramics in China as well as abroad. In this design a series of samples are prepared using solid state sintering. The focus has been on the impact of Ta2O5, with different dopants, and different temperatures on the varistor voltage and nonlinear coefficient and comparisons are made accordingly. The main experimental work and results are as follows: 1. Impacts of Ta2O5 doped within a range of 0.01mol%--1.0mol% on the nonlinear V-A characteristics and dielectric properties of TiO2 varistor ceramics. The results demonstrate that with the gradual increase of Ta2O5 dopant, the nonlinear coefficient of the samples first increases and then decreases, with the maximum being 6 obtained when the Ta2O5 dopant is close to 0.1 mol%; sample dielectric constant (measured at 1kHz frequency) first decreases and then increases, with its minimum occurring when the Ta2O5 dopant is close to 0.1 mol%. 2. Impacts of different temperatures on the varistor characteristics of the samples. The study shows that within a range of 1250℃~1400℃, as the temperature rises, varistor voltage and nonlinear coefficient gradually increase and at 1350℃, the samples have the best pressure sensitivity （V1mA~ 6 ，α~ 6）. 供参考 |
2楼2013-11-30 16:58:34
