多鐵材料摻雜BNT基無鉛壓電陶瓷的制備及性能研究
發(fā)布時間：2019-03-06 13:39
【摘要】：PZT鉛壓電陶瓷長期以來占據(jù)著壓電陶瓷材料的重要地位,隨著社會的進(jìn)步,人們環(huán)保意識的增強(qiáng),研究和開發(fā)具有高性能的無鉛壓電陶瓷是一個具有重要意義的研究課題。Bi_(0.5)Na_(0.5)Ti O_3(BN T)壓電陶瓷因其優(yōu)異的壓電和介電性能成為鉛基壓電陶瓷的最具潛力的替代品之一。本文將通過離子摻雜以及添加新組元的兩種方式對0.935Bi_(0.5)Na_(0.5)Ti O_3-0.065BT(BNT-BT6.5)進(jìn)行改性,具體內(nèi)容如下:(1)通過多鐵材料Sr_3Cu Nb_2O_9摻雜對BNT-BT6.5無鉛壓電陶瓷得到單一的鈣鈦礦結(jié)構(gòu),通過鐵電分析,當(dāng)x=0.003,外加電場為60k V/cm時,矯頑場和剩余極化強(qiáng)度分別為18.41 k V/cm和29.11μC/cm~2并且陶瓷樣品具有最大的單極應(yīng)變系數(shù)S_(m ax)=0.29%和最大的等效壓電常數(shù)d~*_(33)=483 pm/V。(2)0.994BNTBT-0.006SCN陶瓷具有優(yōu)異的儲能性能以及明顯的弛豫行為。通過電滯回線對儲能分析,隨著外加電場的增加,樣品的電滯回線的最大極化強(qiáng)度呈非線性增加。外加電場由20 k V/cm增加到60 k V/cm,最大極化強(qiáng)度由7.5μC/cm~2增加到34.05μC/cm~2。當(dāng)外加電場為60 k V/cm時,儲能密度W_1為0.62J/cm~3,儲能效率η為0.54。(3)通過多鐵材料Bi Mn O_3摻雜對BNT-BT6.5無鉛壓電陶瓷得到單一的鈣鈦礦結(jié)構(gòu),多鐵材料Bi Mn O_3的摻入明顯的促進(jìn)了晶粒的生長,并且使晶界更加明顯,晶粒飽滿圓潤,氣孔減少,陶瓷致密度增加。當(dāng)x=0.015時,壓電常數(shù)d_(33)取得最大值210 p C/N,機(jī)電耦合系數(shù)K_p同為最大值為0.41,介電常數(shù)取得最大值1880,介電損耗最小0.020。通過弛豫行為分析,認(rèn)為陶瓷內(nèi)部存在彌散相變,并且陶瓷內(nèi)部弛豫轉(zhuǎn)變就是彌散相變。(4)采用復(fù)合離子(Fe_(1/2)Ta_(1/2))~(4+)對BNT-BT6.5無鉛壓電陶瓷B位取代,所有的樣品均形成單一純的鈣鈦礦結(jié)構(gòu)。通過SEM分析,隨著FT摻雜量的增加,晶粒尺寸先增大后減小,并且晶界逐漸明顯,氣孔減少,形成致密度較高的壓電陶瓷。當(dāng)x=0.006時,晶粒尺寸最大,3μm~6μm,并且晶界明顯,晶粒大小均勻,沒有氣孔。通過電學(xué)性能分析。當(dāng)x=0.006時,綜合性能最佳:d_(33)=225 p C/N,K_p=40%,ε=1500,tanθ=0.025。通過鐵電性能分析,隨著FT摻雜量的增加,矯頑場逐漸降低,剩余極化強(qiáng)度先增加后降低。當(dāng)x=0.006時,E_c=30 k V/cm,,P_r=33.19μC/cm~2(5)BNT-BT6.5-PZT復(fù)合壓電陶瓷通過XRD分析,當(dāng)PZT摻雜量小于0.09時,樣品均形成單一純的鈣鈦礦結(jié)構(gòu),PZT完全進(jìn)入BNT-BT6.5的晶格內(nèi)。通過SEM分析,隨著PZT含量的增加,晶粒尺寸逐漸增大,晶粒的尺寸的均勻性也有所提高,氣孔逐漸減小,致密度增大,并且出現(xiàn)棱角分明的晶粒,提高陶瓷性能。壓當(dāng)x=0.06時,綜合性能最佳:d_(33)=195 p C/N,K_p=40%,ε=1734,tanθ=0.026。BNT-BT6.5-PZT基復(fù)合壓電陶瓷的研究是一個具有研究價值的研究方向。
[Abstract]:PZT lead piezoelectric ceramics have occupied an important position of piezoelectric ceramics for a long time. With the progress of society, people's awareness of environmental protection has been enhanced. The research and development of lead-free piezoelectric ceramics with high performance is an important research subject. Bi _ (0.5) Na_ (0.5) Ti O _ 3 (BN T) piezoelectric ceramics have excellent piezoelectric and dielectric properties. It has become one of the most potential alternatives to lead-based piezoelectric ceramics. In this paper, 0.935Bi _ (0.5) Na_ (0.5) Ti O_3-0.065BT (BNT-BT6.5) was modified by ion doping and adding new components. The main contents are as follows: (1) single perovskite structure was obtained by doping lead-free BNT-BT6.5 piezoelectric ceramics with multi-iron material Sr_3Cu Nb_2O_9. By ferroelectric analysis, when xx0.003and applied electric field was 60k V/cm, the perovskite structure was obtained. The coercive field and the residual polarization intensity are 18.41 k V/cm and 29.11 渭 C / cm~2, respectively. The ceramic samples have the maximum unipolar strain coefficient S _ (m ax) = 0.29% and the maximum equivalent piezoelectric constant d _ (33) = 483. Pm/V. (2) 0.994BNTBT-0.006SCN ceramics have excellent energy storage properties and obvious relaxation behavior. The maximum polarization intensity of the hysteresis loop increases non-linearly with the increase of the applied electric field through the energy storage analysis of the hysteresis loop pair. The applied electric field increased from 20 k V/cm to 60 kV / cm, and the maximum polarization intensity increased from 7.5 渭 C / cm~2 to 34.05 渭 C / cm~2.. When the applied electric field is 60 k V/cm, the energy storage density is 0.62 J 路cm ~ (3) and the energy storage efficiency 畏 is 0.54. (3) the single perovskite structure of BNT-BT6.5 piezoelectric ceramics doped with Bi Mn O _ (3) is obtained. The addition of multi-iron material Bi Mn O ~ (3 +) obviously promoted the grain growth, and made the grain boundary more obvious, the grain size was full and round, the porosity decreased, and the density of ceramics increased. When x = 0.015, the maximum value of piezoelectric constant d _ (33) is 210 p C _ (n), the electromechanical coupling coefficient K _ (p) is 0.41, the maximum dielectric constant is 1880 and the dielectric loss is 0.020. Through the analysis of relaxation behavior, it is concluded that there exists dispersion phase transition in the ceramics. The internal relaxation transition is dispersion phase transition. (4) lead-free piezoelectric BNT-BT6.5 ceramics are replaced by complex ions (Fe_ (1) _ (1) Ta_ (1) ~ (2) ~ (4). All the samples formed a single pure perovskite structure. By SEM analysis, the grain size increases first and then decreases with the increase of FT doping content, and the grain boundary is obvious gradually, the porosity decreases, and the piezoelectric ceramics with high density are formed. When the grain size is 0.006, the grain size is the largest, 3 渭 m ~ 6 渭 m, and the grain boundary is obvious, the grain size is uniform and there are no pores. The electrical properties are analyzed. When x = 0.006, the comprehensive properties are as follows: d33 = 225 p C 路N, K = 40%, 蔚 = 1500, tan 胃 = 0.025. The ferroelectric properties show that the coercive field decreases and the residual polarization intensity increases first and then decreases with the increase of FT doping content. When x = 0.006, E_c=30 k V 路cm, P = 33.19 渭 C / cm~2 (5) BNT-BT6.5-PZT composite piezoelectric ceramics are analyzed by XRD. When the doping amount of PZT is less than 0.09, all the samples form a single pure perovskite structure, and when the doping amount of PZT is less than 0.09, all the samples form a single pure perovskite structure. PZT fully enters the lattice of BNT-BT6.5. According to SEM analysis, with the increase of PZT content, the grain size increases gradually, the uniformity of grain size increases, the porosity decreases gradually, the densification increases, and the crystal grains with distinct edges and angles appear to improve the properties of ceramics. The composite piezoelectric ceramics with D33 = 195p C, K = 40%, 蔚 = 1734, tan 胃 = 0.026.BNT-BT6.5-PZT-based composite piezoelectric ceramics are the most valuable research directions when the pressure is 0.06.The results show that the composite piezoelectric ceramics based on D33 = 195p C + N, K = 40%, 蔚 = 1734, tan 胃 = composite piezoelectric ceramics are of great value.
【學(xué)位授予單位】：貴州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ174.1
本文編號：2435565
[Abstract]:PZT lead piezoelectric ceramics have occupied an important position of piezoelectric ceramics for a long time. With the progress of society, people's awareness of environmental protection has been enhanced. The research and development of lead-free piezoelectric ceramics with high performance is an important research subject. Bi _ (0.5) Na_ (0.5) Ti O _ 3 (BN T) piezoelectric ceramics have excellent piezoelectric and dielectric properties. It has become one of the most potential alternatives to lead-based piezoelectric ceramics. In this paper, 0.935Bi _ (0.5) Na_ (0.5) Ti O_3-0.065BT (BNT-BT6.5) was modified by ion doping and adding new components. The main contents are as follows: (1) single perovskite structure was obtained by doping lead-free BNT-BT6.5 piezoelectric ceramics with multi-iron material Sr_3Cu Nb_2O_9. By ferroelectric analysis, when xx0.003and applied electric field was 60k V/cm, the perovskite structure was obtained. The coercive field and the residual polarization intensity are 18.41 k V/cm and 29.11 渭 C / cm~2, respectively. The ceramic samples have the maximum unipolar strain coefficient S _ (m ax) = 0.29% and the maximum equivalent piezoelectric constant d _ (33) = 483. Pm/V. (2) 0.994BNTBT-0.006SCN ceramics have excellent energy storage properties and obvious relaxation behavior. The maximum polarization intensity of the hysteresis loop increases non-linearly with the increase of the applied electric field through the energy storage analysis of the hysteresis loop pair. The applied electric field increased from 20 k V/cm to 60 kV / cm, and the maximum polarization intensity increased from 7.5 渭 C / cm~2 to 34.05 渭 C / cm~2.. When the applied electric field is 60 k V/cm, the energy storage density is 0.62 J 路cm ~ (3) and the energy storage efficiency 畏 is 0.54. (3) the single perovskite structure of BNT-BT6.5 piezoelectric ceramics doped with Bi Mn O _ (3) is obtained. The addition of multi-iron material Bi Mn O ~ (3 +) obviously promoted the grain growth, and made the grain boundary more obvious, the grain size was full and round, the porosity decreased, and the density of ceramics increased. When x = 0.015, the maximum value of piezoelectric constant d _ (33) is 210 p C _ (n), the electromechanical coupling coefficient K _ (p) is 0.41, the maximum dielectric constant is 1880 and the dielectric loss is 0.020. Through the analysis of relaxation behavior, it is concluded that there exists dispersion phase transition in the ceramics. The internal relaxation transition is dispersion phase transition. (4) lead-free piezoelectric BNT-BT6.5 ceramics are replaced by complex ions (Fe_ (1) _ (1) Ta_ (1) ~ (2) ~ (4). All the samples formed a single pure perovskite structure. By SEM analysis, the grain size increases first and then decreases with the increase of FT doping content, and the grain boundary is obvious gradually, the porosity decreases, and the piezoelectric ceramics with high density are formed. When the grain size is 0.006, the grain size is the largest, 3 渭 m ~ 6 渭 m, and the grain boundary is obvious, the grain size is uniform and there are no pores. The electrical properties are analyzed. When x = 0.006, the comprehensive properties are as follows: d33 = 225 p C 路N, K = 40%, 蔚 = 1500, tan 胃 = 0.025. The ferroelectric properties show that the coercive field decreases and the residual polarization intensity increases first and then decreases with the increase of FT doping content. When x = 0.006, E_c=30 k V 路cm, P = 33.19 渭 C / cm~2 (5) BNT-BT6.5-PZT composite piezoelectric ceramics are analyzed by XRD. When the doping amount of PZT is less than 0.09, all the samples form a single pure perovskite structure, and when the doping amount of PZT is less than 0.09, all the samples form a single pure perovskite structure. PZT fully enters the lattice of BNT-BT6.5. According to SEM analysis, with the increase of PZT content, the grain size increases gradually, the uniformity of grain size increases, the porosity decreases gradually, the densification increases, and the crystal grains with distinct edges and angles appear to improve the properties of ceramics. The composite piezoelectric ceramics with D33 = 195p C, K = 40%, 蔚 = 1734, tan 胃 = 0.026.BNT-BT6.5-PZT-based composite piezoelectric ceramics are the most valuable research directions when the pressure is 0.06.The results show that the composite piezoelectric ceramics based on D33 = 195p C + N, K = 40%, 蔚 = 1734, tan 胃 = composite piezoelectric ceramics are of great value.
【學(xué)位授予單位】：貴州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ174.1
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