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The lead-free piezoelectric ceramics (1-x)(K0.5Na0.5)NbO3-xLiNbO3(abbreviated as KNLN) were synthesized by a traditional solid state reaction. The effects of Li^+ on the sintering characteristic, the phase structure and piezoelectric properties of KNLN ceramics were investigated. The sintering temperature of KNN-based ceramics is decreased by doping Li^+ and the range of the sintering temperature is narrow. The KNLN ceramics exhibit an enhanced piezoelectric properties with the piezoelectric constant d33 value of 180-200 pC/N, The electromechanical coupling coefficients kp is 35%-40%. The results show that (1-x)(K0.5Na0.5)-NbO3-xLiNbO3 (x=0.05, 0.06) is a promising high-temperature lead free piezoelectric ceramic. 相似文献
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<正>【本刊讯】近日,铜陵有色金冠铜业分公司两项计算机软件著作《金冠顶吹炼铜在线数字模型优化控制系统》《金冠转炉吹炼在线数模辅助决策系统》,获得国家版权局著作版权登记。据悉,由该公司经理赵荣升主持开展的这两项软件著作是奥炉改造工程实现奥炉国产化、自主创新的代表性重大突破,不仅节约了奥炉改造工程建设的大量资金,更是拥有了 相似文献
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采用传统陶瓷制备工艺制备了(K_(0.5)Na_(0.5))NbO_3-LiNbO_3-xMnO_2压电陶瓷,分析了陶瓷样品的微观组织结构.实验结果表明,随MnO_2掺杂量的增多,陶瓷由四方相转变为正交相,晶粒的均匀性下降并生成K_3LiNb_6O_(17)相.研究了MnO_2不同掺杂量对陶瓷压电性能的影响.结果表明,随锰掺杂量的增加,材料逐渐变"硬",机电耦合系数k_p和压电常数d_(33)逐渐减小,同时Q_m逐渐增大;当MnO_2含量为0.8%(质量分数)时,陶瓷的机械品质因数达到最大,此时陶瓷的压电性能为:k_p=0.34,k_t=0.43,d_(33)=110pC/N,Q_m=401.3. 相似文献
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The lead-free piezoelectric ceramics (K0.5Na0.5)NbO3 (abbreviated as KNN) with the relative density of 97.6% were synthesized by press-less sintering owing to the careful control of processing conditions. The phase structure of KNN ceramics was analyzed. The results show that the pure perovskite phase with orthorhombic symmetry is in all ceramics specimens. The effect of poling conditions on the piezoelectric properties of KNN ceramics was investigated. The results show that the piezoelectric constant d33 and electromechanical coupling factor kp increase with poling field, poling temperature and poling time increasing, then decrease because of electric broken. Take into account of poling conditions and piezoelectric properties of pure KNN ceramics, the optimum poling conditions for pure KNN ceramics are poling field of 4 kV/mm, poling temperature of 140 ℃ and poling time of 20-25 min. 相似文献
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采用传统陶瓷工艺制备了掺铋 (Na0.5K0.5)NbO3(NKN)无铅压电致密陶瓷,研究了Bi2O3对 (Na0.5K0.5)NbO3晶体结构和压电性能的影响。结果表明:当Bi2O3含量小于0.7%(质量分数,下同)时,能得到具有纯钙钛矿结构的NKN基陶瓷,其烧结温度随着Bi2O3掺杂量的增加而升高,试样密度与纯NKN陶瓷相比有显著提高。 (Na0.5K0.5)NbO3压电常数d33,机电耦合系数kp、kt随Bi2O3含量的增加先升高而后降低,并在x=0.5%时达到最大值,而且机械品质因子Qm大大提高。当Bi2O3掺杂量为0.5%时, (Na0.5K0.5)NbO3无铅压电陶的密度达4.46g/cm^3,表现出优异的压电性能,d33=138pC/N,kp=46%,kt=44%,tanδ=2.9%,εr=466和Qm=167。 相似文献
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采用传统陶瓷烧结工艺制备了(1-x)(K0.5Na0.5)NbO3-xLiNbO3无铅压电陶瓷,研究了陶瓷的结构、烧结特性及电性能特征.制备的(K0.5Na0.5)NbO3-LiNbO3陶瓷为单一的钙钛矿结构,室温下其相结构随LiNbO3含量增加逐渐由正交相向四方相转变,显微结构也由于LiNbO3含量的不同而表现出很大差异.与(K0.5Na0.5)NbO3陶瓷相比,(K0.5Na0.5)NbO3-LiNbO3陶瓷的烧结温度降低,烧结特性得到改善. (K0.5Na0.5)NbO3-LiNbO3陶瓷表现出优越的压电性能,其中0.94(K0.5Na0.5)NbO3-0.06LiNbO3(x=0.06)陶瓷的压电常数d33达到205pC/N,机电耦合系数kp为40.3%,kt达到49.8%. 相似文献
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