为了获得直径更加均匀、细小的锆酸镧纤维,以无水三氯化镧和八水氧氯化锆为原料,聚乙烯吡咯烷酮(PVP)为助纺剂,采用溶胶-凝胶法制备纺丝溶液,经静电纺丝技术制备出前驱体纤维,再分别经800、1 000以及1 200℃保温8h煅烧后获得La2Zr2O7超细纤维.利用DTA-TG、FTIR、XRD和SEM研究了锆酸镧纤维的形成过程.结果表明:1)未经煅烧的前驱体纤维粗细均匀,平均直径为400 nm;2)当煅烧温度为800℃时,开始形成萤石型锆酸镧纤维,纤维直径变细,平均直径为250 nm,纤维表面光滑;3)当煅烧温度为1 000℃时,纤维中残余有机基团消失,物相为烧绿石结构的锆酸镧,纤维表面开始变得不光滑,平均直径为180 nm;4)当煅烧温度提高到1 200℃时,锆酸镧纤维开始弯曲、粘连,表面更加粗糙.
参考文献
| [1] | 徐强;潘伟;王敬栋;万春磊;齐龙浩;苗赫濯.焦绿石型Ln2Zr2O7陶瓷的研究进展[J].稀有金属材料与工程,2005(z2):1100-1104. |
| [2] | Digeos AA.;Valdez JA.;Sickafus KE.;Atiq S.;Grimes RW.;Boccaccini AR..Glass matrix/pyrochlore phase composites for nuclear wastes encapsulation[J].Journal of Materials Science,20038(8):1597-1604. |
| [3] | Qu ZX;Wan CL;Pan W.Thermal expansion and defect chemistry of MgO-Doped Sm2Zr2O7[J].Chemistry of Materials: A Publication of the American Chemistry Society,200720(20):4913-4918. |
| [4] | 唐慧娟 .稀土氧化物纳米结构纤维的制备及性质[D].山东大学,2011. |
| [5] | Jinxian Wang;Xiangting Dong;Qizheng Cui;Guixia Liu;Wensheng Yu.Preparation and Characterization of Polycrystalline La_2Zr_2O_7 Ultrafine Fibres via Electrospinning[J].Journal of nanoscience and nanotechnology,20113(3):2514-2519. |
| [6] | Yuping Tong;Junwu Zhu;Lude Lu.Preparation and characterization of Ln_2Zr_2O_7 (Ln = La and Nd) nanocrystals and their photocatalytic properties[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,20081/2(1/2):280-284. |
| [7] | Xueqiang Cao;Robert Vassen;Werner Fischer;Frank Tietz;Wolfgang Jungen;Detlev Stover.Lanthanum-Cerium Oxide as a Thermal Barrier-Coating Material for High-Temperature Applications[J].Advanced Materials,200317(17):1438-1442. |
| [8] | Hongfei Chen;Yanfeng Gao;Yun Liu.Coprecipitation synthesis and thermal conductivity of La_2Zr_2O_7[J].Journal of Alloys and Compounds,20092(2):843-848. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%