采用聚合物前驱体法制备了CeO2-CuO—doped SnO2纳米粉体,并研究了掺杂SnO2纳米粉体的无压烧结行为.结果表明:乙二醇、柠檬酸与金属离子的摩尔比为6∶3∶1时制得的掺杂SnO2粉体为分散良好的球形颗粒,大小为～15nm,粒度分布范围窄;CuO掺杂可显著提高SnO2的烧结性能, CeO2-CuO复合掺杂可进一步降低SnO2陶瓷的致密化温度;1.O％CeO2-1.5％CuO-doped SnO2可在1050℃烧结致密,相对密度达96％以上;两步法(先升温到1050℃保温15min,然后降到980℃烧结5h)烧结的1.O％CeO2-1.5％CuO-doped SnO2陶瓷相对密度为96.1％,其晶粒<800nm.
Nanocrystalline SnO2 powders doped with CeO2 and CuO were prepared by the polymeric precursors method. XRD, TG-DSC, TEM and SEM techniques were used to characterize the as-prepared powders and the sintered compacts. The molar ratios of citric acid to metallic elements and ethylene glycol to citric acid were 3:1 and 2:1, respectively. The precursors after burning were calcined at 550℃ in air, and spherical, well-dispersed doped SnO2 powders with an average diameter of ～15nm were obtained. The relative density of 1.0%CeO2-1.5%CuO-doped SnO2 ceramics sintered at 1050℃ is over 96%; the 1.5%CuO-doped SnO2 ceramics can be densified at 1100℃. The grain size of the 1.0%CeO2-1.5%CuO-doped SnO2 ceramics densified by tqo-step sintering (first at 1050℃ for 15min, then cooling down to 980℃ and holding for 5h) is smaller than 800nm.
参考文献
| [1] | Cerri J A, Leite E R, Longo E. J. Am. Ceram. Soc., 1996, 79 (3): 799--804. [2] Kimura K, Inada S, Yamaguchi T. J. Mater. Sci., 1989, 24 (1): 220--226. [3] Leite E R, Cerri J A, Longo E, et al. J. Eur. Ceram. Soc., 2001, 21: 669--675. [4] Lalande J, Fichet R O, et al. J. Eur. Ceram. Soc., 2000, 20: 2415--2420. [5] Matsushita T, Yamai I. Yogyo Kyokai Shi, 1972, 80 (8): 305--312. [6] Takahashi J, Kodaira K, et al. Yogyo Kyokai Shi, 1975, 83 (1): 33--37. [7] Wang Y J, Wang J F, et al. J. Mater. Sci. Lett., 2001, 20: 19--21. [8] Menegotto G F, Pianaro S A, et al. J. Mater. Sci-Mater. El., 2002, 13: 253--256. [9] Gouvea D, Smith A, et al. J. Am. Ceram. Soc., 1997, 80 (10): 2735--2736. [10] Yuan D W, Wang S F, et al. J. Mater. Res., 1993, 8 (7): 1675--1679. [11] Bonnet J P, Dolet N, et al. J. Eur. Ceram. Soc., 1996, 16: 1163--1169. [12] Oliveira M M, Bueno P R, et al. J. Eur. Ceram. Soc., 2001, 21: 1179--1185. [13] Lalande J, Fichet R O, et al. J. Eur. Ceram. Soc., 2000, 20: 2415--2420. [14] Leite E R, Maciel A P, et al. Adv. Mater., 2002, 14 (12): 905--908. [15] Robert C L, Ansart F, et al. Mater. Res. Bull., 2001, 36: 2083--2101. [16] Duran P, Capel F, et al. J. Am. Ceram. Soc., 2001, 84 (8): 1661--1668. [17] Duran P, Capel F, et al. J. Mater. Res., 2001, 16 (1): 197--209. [18] Hoening C L, Searcy A W. J. Am. Ceram. Soc., 1996, 49 (1): 128--134. [19] Varela J A, Whittemore O J, et al. Ceram. Int., 1990, 16 (3): 177--189. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%