本文選題：壓電陶瓷 + KNN�。� 參考：《昆明理工大學》2017年碩士論文

【摘要】：壓電陶瓷材料因其獨特的性能,被廣泛應用于壓電陶瓷點火器、壓電變壓器、壓電陶瓷拾音器及揚聲器等領(lǐng)域。目前,得到最廣泛應用的是鉛基壓電陶瓷材料,但是鉛基壓電陶瓷材料在生產(chǎn)和使用的過程中能夠生成對人體健康和環(huán)境毒害作用的氧化鉛,所以很多國家下達了對鉛基壓電陶瓷材料的使用禁令。所以,開發(fā)新型無鉛基壓電陶瓷材料吸引了各國學者與研究者的目光。本論文中所有樣品均采用傳統(tǒng)固相燒結(jié)法制備,并對它們的壓電物性做了系統(tǒng)研究。首先,我們研究了 Sb5+離子對KNN壓電陶瓷的物相結(jié)構(gòu)、顯微形貌以及其電學性能的影響。XRD與顯微形貌分析結(jié)果如下:當Sb5+離子摻雜含量在0.02≤x≤0.03范圍內(nèi)時,樣品為純的鈣鈦礦結(jié)構(gòu),而當摻雜含量大于0.03時樣品中出現(xiàn)了第二相結(jié)構(gòu);并且Sb5+離子的摻雜可以有效提高KNbO3與NaNbO3之間的固溶度;同時隨著Sb5+摻雜含量的增加,樣品由正交相轉(zhuǎn)變?yōu)樗姆较嘟Y(jié)構(gòu),當Sb5+離子摻雜含量的進一步增加時,樣品開始向偽立方相轉(zhuǎn)變。隨著燒結(jié)溫度的升高樣品中晶粒尺寸呈現(xiàn)先減小后增大的現(xiàn)象,說明Sb5+離子在一定程度上具有助燒的效果。當燒結(jié)溫度為1060℃時,樣品晶粒尺寸均勻,排列較緊密,氣孔率較低。KNN基陶瓷樣品在1060℃下燒結(jié)并且Sb5+離子摻雜含量為x=0.02時取得最佳的綜合性能d33=98pC/N;Qm2456;kp=0.3229;εr= 1043.963;tanδ=0.7836%。其次,我們通過摻雜第二組元BaTiO3,研究了第二組元BaTiO3對KNN基壓電陶瓷的影響。通過XRD和顯微形貌分析結(jié)果如下:當BaTiO3摻雜含量較少時,樣品中出現(xiàn)了第二相結(jié)構(gòu)。而隨著摻雜量的增大,BaTiO3與KNN之間形成固溶體的固溶度增大,當x=0.03時樣品中第二相消失。并且隨著摻雜含量的增加,樣品中存在正交-四方兩相之間的轉(zhuǎn)變。在1080℃下燒結(jié)并且摻雜含量為x=0.02時,樣品取得最佳的晶粒分布,晶粒大小較均勻,排列相對緊密,氣孔率較低。在1080℃下燒結(jié)的0.98KNN-0.02BT的陶瓷樣品取得了最佳的綜合性能:d33=108pC/N;Qm=852.29;kp=0.3;εr=1421;tanδ=0.528%。在BaTiO3摻雜的基礎上我們通過摻雜MnO2對其物相結(jié)構(gòu)、顯微形貌以及其電學性能進一步進行調(diào)控。結(jié)果如下:MnO2在鈣鈦礦晶體結(jié)構(gòu)中固溶度較小,當MnO2摻雜量過多時樣品中出現(xiàn)了雜相。MnO2少量摻雜時Mn4+完全進入晶格,表現(xiàn)為“受主”摻雜的特性;而大量MnO2摻雜時,主要起到燒結(jié)助劑的作用。當x=0.01時樣品為純的鈣鈦礦結(jié)構(gòu)。當MnO2摻雜量在0.01≤x≤0.03范圍內(nèi)并且燒結(jié)溫度為1080℃時,樣品晶界清晰,排列緊密,氣孔率較小。在1080℃下燒結(jié)并且當摻雜含量為x=0.03時的樣品取得最佳的綜合性能:d33=159pC/N;Qm=3435;kp=0.2415;εr=701.9;tanδ=0.4068%。最終,我們主要研究了 LiNbO3摻雜對KNN基壓電陶瓷物相結(jié)構(gòu)、顯微形貌以及其電學性能的影響。分析結(jié)果如下:樣品摻雜LiNbO3之后出現(xiàn)了第二相的衍射峰,并且隨著LiNb03摻雜含量的增加,樣品中出現(xiàn)了正交-四方兩相之間的轉(zhuǎn)變,并且隨著LiNb03摻雜含量的進一步增加,樣品中出現(xiàn)了四方相-偽立方相兩相之間的轉(zhuǎn)變。隨著LiNb03摻雜含量的增加,樣品晶粒尺寸逐漸增大,并且當x=0.03時樣品晶粒之中出現(xiàn)了氣孔等缺陷,并且隨著LiNb03摻雜含量的增加樣品晶界出現(xiàn)不清晰的現(xiàn)象。當x=0.02時樣品取得最優(yōu)的綜合性能:d33=116pC/N;kp=0.326;Qm=2191;εr=699;tanδ=0.324%。
[Abstract]:The piezoelectric ceramic materials because of its unique properties, are widely used in piezoelectric ceramic ignitor, piezoelectric transformer, piezoelectric ceramic microphone and speaker and other fields. At present, is the most widely used lead based piezoelectric ceramic materials, but the lead based piezoelectric ceramic materials in the production and use of the process generation of lead toxicity to human health and the environment, so many countries issued the lead based piezoelectric ceramic materials using the ban. Therefore, the development of new lead-free piezoelectric ceramic based materials have attracted the attention of scholars and research countries. In this thesis the samples by conventional solid phase sintering, and piezoelectric its physical properties were studied. Firstly, we study the Sb5+ ions on the KNN piezoelectric ceramics phase structure, microstructure and electrical properties of.XRD and the influence of microstructure analysis results are as follows: when the Sb5+ ion doped Impurity content in 0.02 = x = 0.03, range, samples are perovskite, while the doping content is more than 0.03 samples appeared in the second phase structure; and the doping of Sb5+ can effectively improve the solid solubility between KNbO3 and NaNbO3; and with the increase of Sb5+ doping content, samples by orthogonal phase transformation for the tetragonal structure, further increases when the Sb5+ doping content, the sample to the pseudo cubic phase transition. With the increase of sintering temperature the grain size in samples showed first decreased and then increased, indicating that Sb5+ ion in a certain extent with the sintering effect. When the sintering temperature is 1060 degrees centigrade, grain uniform size, arranged more closely, the low porosity of.KNN ceramic samples sintered at 1060 DEG C and Sb5+ ion doping content has the best comprehensive performance of d33=98pC/N x=0.02; Qm2456; kp=0.3229; r= tan delta epsilon 1043.963; =0.7836%. then, we doped with second element BaTiO3, the effect of the second component BaTiO3 of KNN based piezoelectric ceramics. Through XRD and microstructure analysis results are as follows: when less BaTiO3 doping content, the second phase structure of the sample. With the increasing of doping amount, solid solubility. Between BaTiO3 and KNN, when x=0.03 of the second phase in the sample and disappear. With the increase of doping content, there is a change of the orthorhombic tetragonal two-phase between samples. Under the temperature of 1080 DEG C sintering and the doping content of x=0.02, the sample has the best distribution of grain, the grain size is uniform, arranged in a relatively close, the porosity is low sintering at a temperature below 1080 DEG 0.98KNN-0.02BT ceramic sample has the best comprehensive performance: d33=108pC/N; Qm=852.29; kp=0.3; e r=1421; tan delta =0.528%. based on BaTiO3 doped we through MnO2 doping on the The phase structure, microstructure and electrical properties of further regulation. The results are as follows: MnO2 in perovskite structure solid solubility is smaller when the doping amount of MnO2 is excessive occurred in the sample phase of.MnO2 when the doping amount is small Mn4+ completely into the lattice, is characteristic of "acceptor" doping; and a large number of MnO2 doping, the main the effects of sintering additives. When x=0.01 samples are perovskite. When the doping amount of MnO2 at x = 0.01 ~ 0.03 range and the sintering temperature is 1080 degrees centigrade, the samples with clear boundaries, closely arranged, the porosity is smaller. Under the temperature of 1080 DEG C and sintering when the doping content of x=0.03 samples obtained the best performance: d33=159pC/N; Qm=3435; kp=0.2415; r=701.9 =0.4068%. tan delta epsilon; finally, we mainly study the LiNbO3 doping of KNN based piezoelectric ceramics phase structure, microstructure and electrical properties of the impact analysis. The results are as follows: the second phase of the diffraction peak appeared after the samples doped with LiNbO3, and with the increase of LiNb03 doping content, changed the orthorhombic tetragonal between the two samples, and with the further increase of LiNb03 doping content, the change of pseudo cubic tetragonal phase between samples. With the increase of LiNb03 doping the content of the sample, the grain size increases, and when x=0.03 samples appear porosity and other defects, and with the increase of the content of LiNb03 doped samples appeared in the grain boundary is not clear phenomenon. The comprehensive performance of samples to obtain the best when x=0.02: d33=116pC/N; kp=0.326; Qm=2191; e r=699; Tan =0.324%..

【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ174.1

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