固相反應法制備稀土摻雜YAG透明陶瓷及其性能研究
發(fā)布時間：2018-12-14 08:00
【摘要】：釔鋁石榴石(Y3Al5O12, YAG),由于其優(yōu)越的化學穩(wěn)定性、光學和機械性能而作為一種重要的陶瓷材料。它可以被用作電子器件的耐熱涂層和摻雜稀土離子的基體用作固體激光器工作物質。近年來,作為YAG單晶的替代品YAG多晶透明陶瓷受到了廣泛的關注。目前,YAG粉體的合成方法主要有固相反應法,共沉淀法,溶膠-凝膠法,其中固相反應法因為具有產量高,工藝簡單的特點被廣泛應用。本文采用商業(yè)Al2O3、Y2O3和稀上氧化物粉體通過固相反應法制備了透明的稀土摻雜YAG透明陶瓷。 用商業(yè)Al2O3、Y2O3、Gd2O3粉體和Ce(NO3)3·xH2O晶體制備了化學式為CexY1.5-xGd1.5Al5O12和CexY3-xAl5O12的透明陶瓷,當Ce3+摻入量增加時,晶粒尺寸明顯變小,透過率降低,當x=0.02時CexY1.5-xGd1.5Al5O12口CexY3-XAl5O12在λ=800nm的直線透過率分別為65.24%和76.59%；CexY3-xAl5O12的發(fā)光強度隨著Ce3+摻入量的增加先增強后減弱,當x=0.05時達到最大,而對于CexY1.5-xGd1.5Al5O12,其發(fā)光強度隨著Ce3+摻入量的增加而減弱,x=0.02其發(fā)光最強。對比CexY1.5-xGd1.5Al5O12和CexY3-xAl5O12,當摻入Gd3+后發(fā)光強度會減弱；對于這兩組樣品,退火只會影響樣品的發(fā)光強度,而對激發(fā)與發(fā)射波長不會產生影響。 以聚丙烯酸銨為分散劑,水為分散介質的Yb：YAG懸浮體系,最佳分散劑含量為0.5wt%；不需要調整pH值,最佳球磨時間為16h；生坯密度隨固相含量的提高而升高；對比不同溫度煅燒的粉體得出1200℃煅燒后的粉體燒結性能較好,但是在成型過程中容易分層,1300℃煅燒后的粉體燒結性能差,但成型過程中不容易分層；對比不同方法對粉體進行表面處理的結果,發(fā)現(xiàn)用磷酸在50℃處理的粉體分散效果好,可以制的固含量高達40vo1%的漿料。 通過模壓成型,制備了層狀復合結構的Yb:YAG/YAG坯體,在不同溫度真空燒結,1700℃燒結后的樣品略有透明；樣品中的晶粒和氣孔大小隨著燒結溫度的升高長大,氣孔是影響樣品透明的主要原因。
[Abstract]:Yttrium aluminum garnet (Y3Al5O12, YAG),) is an important ceramic material due to its excellent chemical stability, optical and mechanical properties. It can be used as the heat resistant coating of electronic devices and the substrate doped with rare earth ions as the working material of solid state lasers. In recent years, YAG polycrystalline transparent ceramics, as a substitute for YAG single crystal, have received wide attention. At present, the synthesis methods of YAG powder mainly include solid state reaction, coprecipitation and sol-gel method. Among them, solid state reaction is widely used because of its high yield and simple process. Transparent rare-earth doped YAG transparent ceramics were prepared by solid state reaction with commercial Al2O3,Y2O3 and thin oxide powders. Transparent ceramics with the chemical expressions CexY1.5-xGd1.5Al5O12 and CexY3-xAl5O12 were prepared from commercial Al2O3,Y2O3,Gd2O3 powder and Ce (NO3) 3 xH2O crystal. When the amount of Ce3 was increased, the grain size became smaller and the transmittance decreased. The straight line transmittance of CexY1.5-xGd1.5Al5O12 mouth CexY3-XAl5O12 at 位 = 800nm is 65.24% and 76.59%, respectively. The luminescence intensity of CexY3-xAl5O12 increases first and then decreases with the increase of Ce3 incorporation, and reaches its maximum when x0. 05. For CexY1.5-xGd1.5Al5O12, the luminescence intensity decreases with the increase of Ce3 incorporation, and x0. 02 is the strongest. Compared with CexY1.5-xGd1.5Al5O12 and CexY3-xAl5O12, the luminescence intensity decreases when Gd3 is added, but annealing only affects the luminescence intensity of the samples, but has no effect on the excitation and emission wavelengths. The optimum dispersant content of Yb:YAG suspension system with ammonium polyacrylate as dispersant and water as dispersing medium is 0.5 wt. the optimum milling time is 16h without adjusting pH value, and the density of green increases with the increase of solid content. Compared with the calcined powders at different temperatures, the sintering properties of the powders calcined at 1200 鈩，
本文編號：2378245
[Abstract]:Yttrium aluminum garnet (Y3Al5O12, YAG),) is an important ceramic material due to its excellent chemical stability, optical and mechanical properties. It can be used as the heat resistant coating of electronic devices and the substrate doped with rare earth ions as the working material of solid state lasers. In recent years, YAG polycrystalline transparent ceramics, as a substitute for YAG single crystal, have received wide attention. At present, the synthesis methods of YAG powder mainly include solid state reaction, coprecipitation and sol-gel method. Among them, solid state reaction is widely used because of its high yield and simple process. Transparent rare-earth doped YAG transparent ceramics were prepared by solid state reaction with commercial Al2O3,Y2O3 and thin oxide powders. Transparent ceramics with the chemical expressions CexY1.5-xGd1.5Al5O12 and CexY3-xAl5O12 were prepared from commercial Al2O3,Y2O3,Gd2O3 powder and Ce (NO3) 3 xH2O crystal. When the amount of Ce3 was increased, the grain size became smaller and the transmittance decreased. The straight line transmittance of CexY1.5-xGd1.5Al5O12 mouth CexY3-XAl5O12 at 位 = 800nm is 65.24% and 76.59%, respectively. The luminescence intensity of CexY3-xAl5O12 increases first and then decreases with the increase of Ce3 incorporation, and reaches its maximum when x0. 05. For CexY1.5-xGd1.5Al5O12, the luminescence intensity decreases with the increase of Ce3 incorporation, and x0. 02 is the strongest. Compared with CexY1.5-xGd1.5Al5O12 and CexY3-xAl5O12, the luminescence intensity decreases when Gd3 is added, but annealing only affects the luminescence intensity of the samples, but has no effect on the excitation and emission wavelengths. The optimum dispersant content of Yb:YAG suspension system with ammonium polyacrylate as dispersant and water as dispersing medium is 0.5 wt. the optimum milling time is 16h without adjusting pH value, and the density of green increases with the increase of solid content. Compared with the calcined powders at different temperatures, the sintering properties of the powders calcined at 1200 鈩，
本文編號：2378245
本文鏈接：http://sikaile.net/shekelunwen/minzhuminquanlunwen/2378245.html
