【摘要】：反鐵電體因具有獨(dú)特的電滯回線以及相轉(zhuǎn)變特征,可被用于高儲(chǔ)能密度脈沖電容器中。本文研究的是鋯錫鈦酸鉛鋇鑭(PBLZST)反鐵電陶瓷,該體系的陶瓷具有優(yōu)異的儲(chǔ)能性能。目前有諸多手段可用來提高反鐵電陶瓷的儲(chǔ)能密度,例如組分調(diào)控、元素?fù)诫s、成分復(fù)合等,然而新的陶瓷燒結(jié)工藝對(duì)儲(chǔ)能性能的影響,則尚未得到深入研究。因此,本文采用了熱壓的新工藝,從以下幾個(gè)方面研究了PBLZST的儲(chǔ)能性能:首先,本文對(duì)熱壓燒結(jié)工藝進(jìn)行了設(shè)計(jì),分別研究了燒結(jié)溫度、保溫時(shí)長(zhǎng)、熱壓壓力等因素對(duì)反鐵電陶瓷性能的影響。實(shí)驗(yàn)結(jié)果表明:熱壓燒結(jié)制備的PBLZST,其燒結(jié)溫度比起普通燒結(jié)可降低近200℃,可在1100℃下燒結(jié)成瓷。同時(shí),保溫時(shí)間為2小時(shí),熱壓壓力調(diào)整到70MP時(shí),陶瓷成瓷效果良好。其次,對(duì)于鉛基陶瓷體系,燒結(jié)過程始終伴隨著鉛揮發(fā)。本文設(shè)計(jì)了五組不同鉛過量組分,研究了PbO過量量對(duì)熱壓和普通燒結(jié)的PBLZST微觀結(jié)構(gòu)和儲(chǔ)能性能的影響。結(jié)果表明:通過SEM分析,熱壓陶瓷樣品晶粒輪廓清晰,微結(jié)構(gòu)更加均勻,氣孔率低,其中PbO過量量為6mol%的熱壓樣品平均晶粒尺寸為1.8μm,致密度達(dá)到99.5%;擊穿場(chǎng)強(qiáng)Weibull分析表明熱壓樣品擊穿場(chǎng)強(qiáng)普遍較高,最高達(dá)到180KV/cm;高壓電阻率測(cè)試結(jié)果表明熱壓樣品電阻率大于1013Ωm,較普通燒結(jié)樣品高兩個(gè)數(shù)量級(jí);熱壓法制備的反鐵電陶瓷樣品,其最高儲(chǔ)能密度達(dá)到3.2 J/cm3,該儲(chǔ)能密度是普通燒結(jié)樣品的2倍。由于在熱壓燒結(jié)過程中,樣品通常處于缺氧狀態(tài),燒結(jié)的陶瓷會(huì)產(chǎn)生氧缺陷,這影響了陶瓷的電性能。本文通過設(shè)計(jì)不同的氧化后處理工藝,研究了后期氧處理對(duì)PBLZST儲(chǔ)能性能的影響。結(jié)果表明:在850℃下,PBLZST在空氣中氧化3小時(shí),或在氧氣氛下氧化1.5小時(shí)(通氧速率為50 mL/min),氧化效果較好。處理后的PBLZST樣品的儲(chǔ)能密度得到進(jìn)一步提高,達(dá)到3.45J/cm3。
[Abstract]:Because of its unique hysteresis loop and phase transition, antiferroelectrics can be used in high energy storage density pulse capacitors. The antiferroelectric ceramics of lead barium zirconium tin titanate lanthanum titanate (PBLZST) are studied in this paper. The ceramics of this system have excellent energy storage properties. At present, there are many ways to improve the energy storage density of antiferroelectric ceramics, such as component control, element doping, composition composite, etc. However, the effect of new sintering process on the energy storage performance has not been further studied. Therefore, the new technology of hot pressing is adopted in this paper, and the energy storage performance of PBLZST is studied from the following aspects: firstly, the hot pressing sintering process is designed, and the sintering temperature and holding time are studied, respectively. The effect of hot pressing pressure on the properties of antiferroelectric ceramics. The experimental results show that the sintering temperature of PBLZST, prepared by hot pressing sintering is about 200 鈩，

本文編號(hào)：2243845