本文關(guān)鍵詞： 共沉淀法 YAG 透明陶瓷　出處：《東北大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

【摘要】：釔鋁石榴石(Y3Al5O12,YAG),由于其優(yōu)越的化學(xué)穩(wěn)定性、光學(xué)和機(jī)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(zhì)。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(guān)注。目前,YAG粉體的合成方法主要有固相反應(yīng)法,共沉淀法,溶膠-凝膠法,其中因?yàn)楣渤恋矸üに嚭?jiǎn)單、比較易于控制,因此被廣泛應(yīng)用于YAG陶瓷的制備。 本論文以硫酸鋁、硝酸、氧化釔和碳酸氫銨為原料,采用共沉淀法制備YAG納米粉體,制備的粉體顆粒直徑大約為50nm,粉體呈橢球形。 通過在主鹽溶液中加入分散劑硫酸銨的方法可改善粉體的分散性。隨著硫酸銨加入量的加大,前驅(qū)體1100℃煅燒4h后的YAG粉體分散性越來越好,當(dāng)分散劑硫酸銨銨的加入量為0.030mol時(shí)制備的YAG粉體分散性最好,此時(shí)粉體的燒結(jié)性最好；時(shí)效時(shí)間對(duì)粉體性能的影響不大；滴定速度對(duì)粉體性能的影響較顯著,隨著滴定速度的增加,制備的粉體過渡相越來越少,當(dāng)?shù)味ㄋ俣葹?0ml/min時(shí),粉體主要為YAG相,粉體的燒結(jié)性較好,試樣1650℃真空燒結(jié)后透光率達(dá)到20%以上；且隨著滴定速度的加大,粉體顆粒變��；前驅(qū)體的不同清洗工藝可影響其性能,當(dāng)清洗工藝為三遍去離子水+無水乙醇+丙酮時(shí),得到的粉體燒結(jié)性能較好；而清洗工藝為去離子水洗三遍+無水乙醇+硬脂酸乙醇溶液,得到的粉體分散性較好；加入助燒劑可改善YAG粉體的燒結(jié)性。助燒劑TEOS添加量為理論YAG粉體總量的0.5%的粉體比TEOS添加量理論YAG粉體總量的0.3%燒結(jié)性好,TEOS的添加量為0.5%時(shí)較佳。
[Abstract]:Yttrium aluminum garnet (Y3Al5O12) has excellent chemical stability due to its excellent chemical stability. As an important ceramic material, optical and mechanical properties can be used as heat-resistant coatings of electronic devices and substrate doped with rare earth ions as working materials for solid-state lasers in recent years. As a substitute for YAG single crystal, YAG polycrystalline transparent ceramics have been paid more and more attention. At present, the main synthesis methods of YAG powder are solid state reaction, coprecipitation and sol-gel method. Because the coprecipitation process is simple and easy to control, it is widely used in the preparation of YAG ceramics. In this paper, YAG nanocrystalline powders were prepared by co-precipitation method using aluminum sulfate, nitric acid, yttrium oxide and ammonium bicarbonate as raw materials. The diameter of the powders was about 50 nm and the powder was ellipsoidal. The dispersity of YAG powders can be improved by adding ammonium sulfate into the main salt solution. With the increase of the amount of ammonium sulfate, the dispersity of YAG powders calcined at 1100 鈩，

本文編號(hào)：1455253