-
摘要: 纳米Y2O3稳定的ZrO2粉在4 GPa高压下、1 000~1 200 ℃烧结2 min致密成型。完整块体致密度为99.3%。在高压烧结过程中,由于外加压力对扩散的促进作用,活化能比用其它方法烧结时降低,约为48 kJ/mol,晶粒长至40~70 nm。四方度及晶胞体积略小于常压烧结样品的数值。高压快速烧结ZrO2(4Y)陶瓷为棕色、深灰色或黑色。快速高压烧结所得样品结构存在某种非均匀性。
-
关键词:
- 纳米ZrO2(4Y) /
- 快速超高压烧结 /
- 显微结构 /
- 颜色
Abstract: Nanocrystalline ZrO2 (4Y) powders were sintered under 4 GPa and at 1 000~1 200 ℃ for 2 min. The results show that the relative density of undamaged sintered ceramics body is 99.3%. In the sintering process under high pressure, activation energy is less than that by other method because of the effect of applied pressure on diffusion. The activation energy is about 48 kJ/mol. Crystal grains ranges from 40 to 70 nm. The ctat-1 t size and unit cell volume of the t-ZrO2 is smaller than that sintered under normal pressure. The color of ZrO2 (4Y) is brown, dark gray and black. The structure of ZrO2 (4Y) is not homogenous.-
Key words:
- nano ZrO2 (4Y) /
- rapid sintering at high pressure /
- microstructure /
- color
-
Soutton W N. Microwave Processing of Ceramic Materials [J]. Am Ceram Soc Bull, 1989, 68(2): 376. 李蔚, 高濂, 洪余生, 等. 快速烧结制备纳米Y-TZP材料 [J]. 无机材料学报, 2000, 15(2): 269-274. 袁望治, 劳令耳, 田卫, 等. 纳米Zr02(4Y)两次成型常压烧结致密特性及其电导率 [J]. 材料科学与工程, 2000, 18(3): 57-60. Brook R J. Ceramic Fabri-Cation Processes [A]. Franklin Wang F Y. Treatise on Materials Science and Technology (Vol. 9) [C]. New York: Academic Press, 1976: 331-364. Nich T C, Wadsworth J. Dynamic Grain Growth during Superplastic Deformation of Yttria-Stabilized Tetragonal Zirconia Polycrystals [J]. J Am Cera Soc, 1989, 72: 1469-1472. Mayo M J. High and Low Temperature Superplasticity in Nanocrystalline Materials [J]. Nanostructured Materials, 1997, 9: 717-726. Yuan Wangzhi, Lao linger, Tian Wei, et al. Effect of Nano-AI2O3 on the Densiflcation and the Conductivity of Nano- ZrO2(4Y) Properties of Normal Pressure [A]. Chowdari B V R, Wang Wenji. Solid State Ionics: Materials and Devices [C]. Singerpore: World Scientific Publishing Co Pte Ltd, 2000: 523-527. 李蔚, 髙濂, 归林华, 等. 纳米Y-TZP材料烧结过程晶粒生长分析 [J]. 无机材料学报, 2000, 15(4): 607-611. 许勤论, 侯碧辉, 张裕恒. ZrO2纳米材料制备及其顺磁特性研究 [J]. 科学通报, 1993, 42(3): 500-503. 邱元武, 张波, 刘建成. 氧化钇稳定立方氧化锆晶体中空位和杂质的电子结构 [J]. 物理学报, 1993, 42(8): 1297-1301. Xin Guo. Effect of DC Voltage on the Microstructure and Electrical Properties of Stabilized-Zirconia [J]. Solid State Ionics, 1997, 99: 143-151. 章天金, 彭芳明, 雷超群, 等. 溶胶-凝胶工艺合成ZrO2超微粉末的研究 [J]. 无机材料学报, 1996, 11(4): 435-440.
点击查看大图
计量
- 文章访问数: 7615
- HTML全文浏览量: 334
- PDF下载量: 742