本文選題：PZT95/5鐵電陶瓷 + 孔隙率　； 參考：《寧波大學(xué)》2014年碩士論文

【摘要】：高鋯系Pb(Zr0.95Ti0.05)O3(PZT 95/5)鐵電陶瓷材料是鐵電相和反鐵電相共存的一類鐵電陶瓷,具有非常優(yōu)良的儲(chǔ)能特性。在沖擊載荷加載下,極化后已儲(chǔ)存大量束縛電荷的PZT95/5鐵電陶瓷會(huì)在極短時(shí)間內(nèi)發(fā)生菱方鐵電相到正交反鐵電相相變而去極化,從而釋放出儲(chǔ)存的電荷,因此可以用于制備小巧的脈沖能源裝置、爆電起爆裝置等。本文結(jié)合數(shù)字散斑技術(shù)(DIC)對(duì)不同孔隙含量的PZT95/5未極化與極化鐵電陶瓷進(jìn)行準(zhǔn)靜態(tài)單軸壓縮、動(dòng)態(tài)單軸壓縮(SHPB)實(shí)驗(yàn),研究不同孔隙含量對(duì)材料力學(xué)性能的影響。1)準(zhǔn)靜態(tài)單軸壓縮實(shí)驗(yàn)下未極化PZT95/5鐵電陶瓷與極化PZT95/5鐵電陶瓷的彈性模量、壓縮強(qiáng)度、斷裂應(yīng)變基本相同,除了斷裂應(yīng)變不受孔隙率變化影響外,其它均隨孔隙率的增大而下降。根據(jù)體積不變?cè)矸治龅玫搅宋礃O化、極化PZT95/5的疇變起始點(diǎn)與相變起始點(diǎn)。其中,未極化與極化PZT95/5的疇變壓力、相變壓力均隨孔隙率增大而下降。未極化PZT95/5疇變壓力高于極化PZT95/5的疇變壓力,而兩者的相變壓力恰恰相反,隨著孔隙率的增大兩者的差距逐漸縮小,在孔隙率為18%左右時(shí)基本相同。2)動(dòng)態(tài)單軸壓縮實(shí)驗(yàn)下通過(guò)時(shí)間與體積應(yīng)變關(guān)系曲線間接得到了未極化、極化PZT95/5鐵電陶瓷不同孔隙率下的相變起始點(diǎn)。未極化PZT95/5的壓縮強(qiáng)度、斷裂應(yīng)變、疇變壓力、相變壓力均隨孔隙率的增加而下降。極化PZT95/5的壓縮強(qiáng)度、疇變壓力、相變壓力隨著孔隙率的增加而下降,而斷裂應(yīng)變?cè)诳紫堵市∮?1%時(shí)基本保持不變,當(dāng)孔隙率大于11%后隨孔隙率增大而減小。未極化PZT95/5與極化PZT95/5的壓縮強(qiáng)度在孔隙率小于11%時(shí)幾乎相同,而當(dāng)孔隙率大于11%后未極化PZT95/5的壓縮強(qiáng)度要高于極化PZT95/5的壓縮強(qiáng)度。未極化PZT95/5與極化PZT95/5的斷裂應(yīng)變?cè)诳紫堵市∮?3%時(shí)幾乎相同,而當(dāng)孔隙率大于13%后未極化PZT95/5的斷裂應(yīng)變要高于極化PZT95/5的斷裂應(yīng)變。未極化PZT95/5的疇變壓力高于極化PZT95/5的疇變壓力,而兩者的相變壓力大致相同。3)比較了動(dòng)態(tài)與準(zhǔn)靜態(tài)加載下不同孔隙率對(duì)未極化、極化PZT95/5鐵電陶瓷力學(xué)性能的影響。準(zhǔn)靜態(tài)下未極化PZT95/5的壓縮強(qiáng)度與動(dòng)態(tài)下未極化PZT95/5的壓縮強(qiáng)度基本保持一致。在孔隙率為11%左右時(shí)準(zhǔn)靜態(tài)下極化PZT95/5的壓縮強(qiáng)度與動(dòng)態(tài)下的壓縮強(qiáng)度基本相同,而在其余孔隙率時(shí)準(zhǔn)靜態(tài)下極化PZT95/5的壓縮強(qiáng)度均高于動(dòng)態(tài)下極化PZT95/5的壓縮強(qiáng)度。準(zhǔn)靜態(tài)下未極化與極化PZT95/5的斷裂應(yīng)變均高于各自在動(dòng)態(tài)下的斷裂應(yīng)變。準(zhǔn)靜態(tài)下未極化與極化PZT95/5的疇變壓力均高于各自在動(dòng)態(tài)下的疇變壓力。準(zhǔn)靜態(tài)下極化PZT95/5的相變壓力與動(dòng)態(tài)下極化PZT95/5的相變壓力幾乎相同。動(dòng)態(tài)下未極化PZT95/5的相變壓力高于準(zhǔn)靜態(tài)下未極化PZT95/5的相變壓力。4)構(gòu)建了PZT95/5鐵電陶瓷在準(zhǔn)靜態(tài)單軸壓縮下考慮不同孔隙率影響的非線性純力學(xué)本構(gòu)。本構(gòu)方程包括鐵電相、鐵電-反鐵電相共存、反鐵電相三個(gè)階段,并對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行了擬合,獲得了本構(gòu)參數(shù)。
[Abstract]:The high zirconium Pb (Zr0.95Ti0.05) O3 (PZT 95/5) ferroelectric ceramics are ferroelectric ceramics which coexist with the ferroelectric phase and antiferroelectric phase, and have excellent energy storage properties. Under the load loading, the PZT95/5 ferroelectric ceramics, which have stored a large amount of bound charge after the polarization, will have the phase transition of the rhombus ferroelectric phase to the orthogonal antiferroelectric phase in the very short time. Depolarization, thus releasing the stored charge, can be used to prepare small pulse energy devices, detonating devices and so on. In this paper, the PZT95/5 unpolarized and polarized ferroelectric ceramics with different pore content are subjected to quasi static uniaxial compression and dynamic uniaxial compression (SHPB) experiments with different pore content, and the different pore content pairs are studied by using digital speckle technique (DIC). .1) the modulus of elasticity, compressive strength and fracture strain of unpolarized PZT95/5 ferroelectric ceramics and polarization PZT95/5 ferroelectric ceramics are basically the same under quasi static uniaxial compression test. Except the fracture strain is not affected by the change of porosity, the others decrease with the increase of porosity. The analysis is obtained by the principle of volume invariance. The domain change starting point and the starting point of the polarization PZT95/5 are not polarized, in which the pressure of the domain change of the unpolarized and polarized PZT95/5 decreases with the increase of the porosity. The unpolarized PZT95/5 domain pressure is higher than the domain change pressure of the polarization PZT95/5, and the phase transition pressure is exactly opposite, and the gap gradually decreases with the increase of the porosity. When the porosity is about 18%, it is basically the same.2). Under the dynamic uniaxial compression test, the starting point of unpolarized, polarized PZT95/5 ferroelectric ceramics under different porosity is indirectly obtained under the dynamic uniaxial compression test. The compressive strength of unpolarized PZT95/5, the fracture strain, the domain change pressure, and the phase change pressure are all under the increase of porosity. The compression strength, domain change pressure and phase change pressure decrease with the increase of porosity, while the fracture strain is basically unchanged when the porosity is less than 11%. When the porosity is greater than 11%, the porosity decreases with the porosity increasing. The compressive strength of unpolarized PZT95/5 and polarization PZT95/5 is almost the same when porosity is less than 11%, and when porosity is less than 11%. The compression strength of unpolarized PZT95/5 after the rate of more than 11% is higher than the compression strength of polarization PZT95/5. The fracture strain of unpolarized PZT95/5 and polarization PZT95/5 is almost the same when the porosity is less than 13%, while the fracture strain of unpolarized PZT95/5 is higher than the polarization strain of polarization PZT95/5 when the porosity is greater than 13%. The domain change pressure of unpolarized PZT95/5 is higher. The domain change pressure of polarization PZT95/5, while the phase transition pressure is approximately.3), compares the effects of different porosity on the mechanical properties of unpolarized and polarized PZT95/5 ferroelectric ceramics under dynamic and quasi-static loading. The compressive strength of unpolarized PZT95/5 under quasi static condition is basically consistent with the compressive strength of unpolarized PZT95/5 under dynamic conditions. The compressive strength of the quasi static lower polarization PZT95/5 is almost the same as the dynamic compressive strength at about 11%, while the compressive strength of the quasi-static lower polarization PZT95/5 is higher than that of the dynamic lower polarization PZT95/5 at the rest of the porosity. The fracture strain of the unpolarized and polarizing PZT95/5 under quasi static state is higher than that under the dynamic fracture stress. The domain variation pressure of the unpolarized and polarizing PZT95/5 under quasi static state is higher than that of the domain variation under the dynamic state. The phase transition pressure of the quasi static down polarization PZT95/5 is almost the same as that of the dynamic lower polarization PZT95/5. The phase transition pressure of the unpolarized PZT95/5 is higher than the phase transition pressure.4 under the quasi static unpolarized PZT95/5. The phase transition pressure of the dynamic under polarization is higher than that of the quasi static PZT95/5. The constitutive equations include ferroelectric phase, ferroelectric antiferroelectric phase coexistence and antiferroelectric phase three stages, and the constitutive parameters are obtained. The constitutive equation of 5 Ferroelectric Ceramics is considered under quasi static uniaxial compression.

【學(xué)位授予單位】：寧波大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM28

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 夏志國(guó);李強(qiáng);;PZT基反鐵電材料研究進(jìn)展[J];人工晶體學(xué)報(bào);2006年04期

，

本文編號(hào)：1841255