( 1. 東北大學(xué) 理學(xué)院, 沈陽 110004；
2. 山東理工大學(xué) 化工學(xué)院, 淄博 255049)
摘 要: 采用基于Pechini法的低溫燃燒工藝制備了SrCe0.95Y0.05O3-x(SCY)前驅(qū)物。 前驅(qū)物在900 ℃經(jīng)0.5h的煅燒處理即可得到純的粒度在7～25 nm范圍內(nèi)的SrCe0.95Y0.05O3-x固體電解質(zhì)納米粉。 將煅燒的粉體在18 MPa壓力下壓成片狀的素坯， 在900～1 500 ℃的溫度范圍內(nèi)于空氣中燒結(jié)素坯10 h。 用X射線衍射(XRD)表征煅燒粉體的晶體結(jié)構(gòu)， 用掃描電鏡(SEM)和透射電鏡(TEM)表征了煅燒粉體和燒結(jié)體的形貌和粒度， 采用阿基米德法測(cè)量了燒結(jié)體的密度。 結(jié)果表明： 溫度達(dá)到1 000 ℃時(shí)， 燒結(jié)體的徑向收縮率和密度隨著溫度的升高而顯著增加； 溫度達(dá)1 300 ℃時(shí)燒結(jié)體的徑向收縮率和密度趨于恒定， 得到相對(duì)密度高于96％、 平均粒徑約為3.68μm 的SrCe0.95Y0.05O3-x固體電解質(zhì)陶瓷體。
關(guān)鍵字: 固體電解質(zhì)； SrCe0.95Y0.05O3-x； 納米陶瓷粉； 燒結(jié)；低溫燃燒
（ 1. College of Science, Northeastern University,
Shenyang 110004, China;
2. College of Chemical Engineering and Technology,
Shandong University of Technology, Zibo 255049, China）
Abstract: Precursors for SrCe0.95Y0.05O3-x (SCY) were synthesized by sol-combustion process based on the Pechini method. Pure SrCe0.95Y0.05O3-x nanosized powders with the size range of 7-25 nm were obtained after calcining the precursors at 900 ℃ for 0.5 h. The calcined powders were pressed into pellets at 18 MPa. These pellets were sintered at the temperature range of 900-1500 ℃ for 10h in air. The crystal structure of the calcined powders was analyzed using XRD. The morphology and crystallite sizes of the calcined powders and the sintered pellets were observed using SEM and TEM. The densities of the sintered pellets were measured using Archimedes method with water. The results indicate that, at 1 000 ℃ and above, the radial shrinkage and the density of the sintered pellets obviously increase; at a temperature as high as 1 300 ℃, nearly fully dense SrCe0.95Y0.05O3-x ceramic (relative density larger than 96%) with a mean grain size of 3.68 μm can be obtained.
Key words: solid electrolyte; SrCe0.95Y0.05O3-x; nanosized ceramic powder; sintering; low temperature combustion
