APP  >> Vol. 5 No. 12 (December 2015)

    聚乙二醇水热法制备锆酸镧纳米晶
    Nanostructured Lanthanum Zirconate Prepared by Polyethylene Glycol Hydrothermal Method

  • 全文下载: PDF(3040KB) HTML   XML   PP.202-208   DOI: 10.12677/APP.2015.512028  
  • 下载量: 1,382  浏览量: 4,896  

作者:  

高健明:麓山滨江实验学校,湖南 长沙;
徐子慧,刘向阳,梁工英:西安交通大学理学院,陕西 西安

关键词:
聚乙二醇水热法纳米结构锆酸镧Polyethylene Glycol Hydrothermal Method Nanostructure Lanthanum Zirconate

摘要:

文中采用聚乙二醇水热法液相合成的方法,探讨了在较低温度下合成La2Zr2O7纳米晶为主体粉末的工艺,并对已获得的La2Zr2O7粉末进行了结构的表征。结果表明,采用K2CO3作为矿化剂,在225˚C进行La2Zr2O7合成反应,并不能一步生成La2Zr2O7纳米晶体,而只能生成LaCO3(OH)的前驱体,但是当对该前驱体进行二次烧结后,即可以获得以La2Zr2O7为主体的纳米晶,在900˚C~1100˚C条件下烧结的La2Zr2O7晶粒尺寸小于30 nm,即使在1400˚C条件下烧结2 h,La2Zr2O7晶粒尺寸也仅60 nm。

Nanostructured lanthanum zirconate powders were successfully prepared by polyethylene glycol hydrothermal method at relatively lower sintering temperature. XRD and SEM were carried out to study the phase structure and grain size of the lanthanum zirconate. It can be concluded that precursor of lanthanum zirconate can be obtained after hydrothermal synthesis at 498 K and nanostructured lanthanum zirconate can be obtained after sintered at high temperature (above 1173 K). The grain size of lanthanum zirconate is about 30 nm after sintered at 1173 K - 1373 K. Meanwhile, the grain size is as small as 60 nm after sintered at 1673 K for 2 h.

文章引用:
高健明, 徐子慧, 刘向阳, 梁工英. 聚乙二醇水热法制备锆酸镧纳米晶[J]. 应用物理, 2015, 5(12): 202-208. http://dx.doi.org/10.12677/APP.2015.512028

参考文献

[1] Padture, N.P., Gell, M. and Jordan, E.H. (2002) Thermal Barrier Coatings for Gas-Turbine Engine Applications. Science, 296, 280-284.
http://dx.doi.org/10.1126/science.1068609
[2] Evans, A.G., Clarke, D.R. and Levi, C.G. (2008) The Influence of Oxides on the Performance of Advanced Gas Turbines. Journal of the European Ceramic Society, 28, 1405-1419.
http://dx.doi.org/10.1016/j.jeurceramsoc.2007.12.023
[3] Sohn, Y.H., Lee, E.Y., Nagaraj, B.A., et al. (2001) Microstructural Characterization of Thermal Barrier Coatings on High Pressure Turbine Blades. Surface and Coatings Technology, 146, 132-139.
http://dx.doi.org/10.1016/S0257-8972(01)01369-X
[4] 张玉娟, 张玉驰, 孙晓峰, 等. 热障涂层的发展现状[J]. 材料保护, 2004, 37(6): 26-29.
[5] 刘纯波, 林锋, 蒋显亮. 热障涂层的研究现状与发展趋势[J]. 中国有色金属学报, 2007, 17(1): 1-13.
[6] Cao, X.Q., Vassen, R. and Stoever, D. (2004) Ceramic Materials for Thermal Barrier Coatings. Journal of the European Ceramic Society, 24, 1-10.
http://dx.doi.org/10.1016/S0955-2219(03)00129-8
[7] 徐鹏, 宋仁国, 王超. 大气等离子喷涂氧化锆热障涂层研究进展[J]. 热加工工艺, 2011, 40(12): 114-117.
[8] VaBen, R., Cao, X. and Stover, D. (2009) Improvement of New Thermal Barrier Coating Systems Using a Layered or Graded Structure. 25th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures-B: Ceramic Engineering and Science Proceedings, 4, 435.
[9] Vassen, R., Cao, X., Tietz, F., et al. (1999) La2Zr2O7—A New Candidate for Thermal Barrier Coatings. Proceedings of the United Thermal Spray Conference-UTSC’99, DVS-Verlag, Düsseldorf, 830-834.
[10] 赵晓东, 谢建刚, 曾克里, 等. 纳米锆酸镧团聚体特性及等离子涂层性能的研究[J]. 有色金属: 冶炼部分, 2008(S1): 34-37.
[11] Wang, C., Wang, Y., Cheng, Y., et al. (2012) Preparation and Thermophysical Properties of Nano-Sized Ln2Zr2O7 (Ln= La, Nd, Sm, and Gd) Ceramics with Pyrochlore Structure. Journal of Materials Science, 47, 4392-4399.
http://dx.doi.org/10.1007/s10853-012-6293-6
[12] Zhao, X., Zeng, K., Xie, J., et al. (2007) Nanostructured Lanthanum Zirconate Coating and Its Thermal Stability Properties. Journal of Iron and Steel Research, International, 14, 147-151.
http://dx.doi.org/10.1016/S1006-706X(08)60069-2
[13] 曹学强. 热障涂层材料[J]. 北京: 科学出版社, 2008: 240-244.
[14] Chen, D. and Xu, R. (1998) Hydrothermal Synthesis and Characterization of La2M2O7 (M= Ti, Zr) Powders. Materials Research Bulletin, 33, 409-417.
http://dx.doi.org/10.1016/S0025-5408(97)00242-0