铌酸钠钾基压电陶瓷的制备与改性研究

发布时间：2018-06-25 17:59

本文选题：溶胶-凝胶法 + 铌酸钠钾压电陶瓷　；参考：《济南大学》2016年硕士论文

【摘要】：采用溶胶-凝胶法研究了铌酸钠钾基压电陶瓷体的制备工艺条件,制备了纯(K_(0.5)Na_(0.5))NbO_3(简写为KNN)压电陶瓷,以及改性元素铋、铁(简写为BF)掺杂的(K_(0.5)Na_(0.5))_(1-x)Nb_(1-x)O_(3-x)BF(简写为KNN-x BF)压电陶瓷。烧结温度为1100℃,保温时间为2h时,制备的KNN-0.008BF陶瓷的压电常数d33为136p C/N,为正交钙钛矿结构,结构较为致密,晶粒尺寸较为均匀,结晶程度较为完善。铌酸钠钾基压电陶瓷在烧结过程中碱金属元素钠、钾极易挥发,导致陶瓷的化学计量发生偏移,影响陶瓷的结构性能。掺加过量碱金属元素Na和K,制备(K_(0.496)Na_(0.496))Nb_(0.992)O_3-0.008BF-xNa(简写为KNN-BF-x Na)、和(K_(0.496)Na_(0.496))Nb_(0.992)O_3-0.008BF-yK(简写为KNN-BF-y K)压电陶瓷。碱金属元素钠的过量掺量为0.03时,陶瓷获得较为优异的结构性能,其压电常数d33为149p C/N,机电耦合系数Kp为0.41,介电常数ε_r为641,介质损耗tanδ为0.06。同时陶瓷为单一的正交钙钛矿结构,结晶较为完善,晶体颗粒较为均匀,致密度较好。在碱金属元素钠的过量掺量为0.03的基础上掺加烧结助剂Cu O,制备不同烧结助剂掺量下的(K_(0.496)Na_(0.496))Nb_(0.992)O_3-0.008BF-0.03Na(简称KNN-BF-Na)压电陶瓷。在掺量为0.010时,晶粒发育比较完善,颗粒的均匀性、致密度均较好,为单一的正交钙钛矿结构,其压电常数电常数d33为128p C/N,机电耦合系数Kp为0.37,介电常数ε_r为625,介质损耗tanδ为0.08,具有较好的电学性能。设计了三因素三水平的正交实验,观察烧结温度、Li掺量、烧结助剂Cu O掺量的影响规律。制备了九组不同碱金属元素Li和烧结助剂Cu O掺量下的(K_(0.5)Na_(0.5))_(0.992-x)Nb_(0.992)O_3-0.008BF(简称KNN-BF)压电陶瓷,并对陶瓷材料的结构、密度和压电性能进行了分析。试样晶粒尺寸较为均匀,致密度相对较好,为单一的正交钙钛矿结构或四方钙钛矿结构。通过正交实验分析及验证知,烧结温度为1000℃,Li掺量为0.04,Cu O掺量为0.005时,陶瓷材料具有较优异的压电性能,其压电常数达到99p C/N,密度达到4.13g/cm~3。
[Abstract]:The preparation conditions of potassium sodium niobate potassium based piezoelectric ceramics were studied by sol-gel method. The pure (K_ (0.5) Na_ (0.5)) NbO_3 (KNN) piezoelectric ceramics, and the modified element bismuth, (K_ (0.5) Na_ (0.5)) doped (1-x) Nb_ (1-x) O_ (1-x) O_ (3-x) piezoelectric ceramics were prepared. The sintering temperature was 1100, and the holding time was 1100. The piezoelectric constant d33 of KNN-0.008BF ceramics prepared for 2h is 136p C/N, which is an orthogonal perovskite structure with more compact structure, more uniform grain size and more perfect crystallization. The sodium niobate potassium based piezoelectric ceramic is very volatile in the process of sintering, which leads to the shift of the chemical metrology of ceramics and the effect of ceramic junction. Structure properties. Adding excess alkali metal elements Na and K to prepare (K_ (0.496) Na_ (0.496)) Nb_ (0.992) O_3-0.008BF-xNa (short of KNN-BF-x Na), and (K_ (0.496) Na_ (0.496)) Nb_ (0.992) O_3-0.008BF-yK (abbreviated as) piezoelectric ceramics. When the excess amount of sodium alkali metal is 0.03, the ceramics have excellent structural properties, and their piezoelectricity is constant The number of d33 is 149p C/N, the electromechanical coupling coefficient Kp is 0.41, the dielectric constant epsilon _r is 641, the dielectric loss tan delta is 0.06. at the same time as the single orthogonal perovskite structure, the crystal is more perfect, the crystal particles are more uniform and the density is better. The sintering aids Cu O is added to the alkali metal element sodium over 0.03, and the sintering aid is prepared for different sintering aid. Under the dosage of (K_ (0.496) Na_ (0.496)) Nb_ (0.992) O_3-0.008BF-0.03Na (abbreviated as KNN-BF-Na) piezoelectric ceramics, the grain development is perfect, the grain uniformity and the density are better when the amount is 0.010, which is a single orthogonal perovskite structure. The piezoelectric constant d33 is 128p C/N, the electromechanical coupling coefficient Kp is 0.37, the dielectric constant is 6 and the dielectric constant is 6 25, the dielectric loss tan delta is 0.08 and has good electrical properties. An orthogonal experiment with three factors and three levels is designed to observe the influence of sintering temperature, Li content, and sintering aids Cu O doping. Nine groups of alkali metal elements Li and Cu O doping (K_ (0.5) Na_ (0.5)) (0.992-x) Nb_ (0.992) O_3-0.008BF (0.992-x) O_3-0.008BF (0.992) O_3-0.008BF (0.992-x) O_3-0.008BF (0.992-x) O_3-0.008BF (0.992-x) O_3-0.008BF (0.992) O_3-0.008BF (0.992-x) O_3-0.008BF (0.992-x) O_3-0.008BF (0.992-x) O_3-0.008BF (0.992) O_3-0.008BF The structure, density and piezoelectric properties of ceramic materials are analyzed. The grain size of the specimen is more uniform and the density is relatively good. It is a single orthogonal perovskite structure or tetragonal perovskite structure. Through orthogonal experimental analysis and verification, the ceramic material has a sintering temperature of 1000, 0.04 Li and 0.005 Cu O. It has excellent piezoelectric properties, and its piezoelectric constant reaches 99p C/N, and its density is 4.13g/cm~3..
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TQ174.1

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