以冰为模板制备超轻多孔氧化锆块材

材料研究学报

2009, Vol. 23

Issue (5): 518-523

研究论文

本期目录 | 过刊浏览

以冰为模板制备超轻多孔氧化锆块材

曹阳; 贺军辉

中国科学院理化技术研究所功能纳米材料实验室北京 100190

Preparation and formation mechanism of porous ultralightweight zirconia by ice templating

CAO Yang; HE Junhui

Functional Nanomaterials Laboratory; Technical Institute of Physics and Chemistry; Chinese Academy of Sciences (CAS); Beijing 100190)

引用本文:

曹阳贺军辉. 以冰为模板制备超轻多孔氧化锆块材[J]. 材料研究学报, 2009, 23(5): 518-523.
. Preparation and formation mechanism of porous ultralightweight zirconia by ice templating[J]. Chin J Mater Res, 2009, 23(5): 518-523.

全文: PDF(1171 KB)

摘要:

以冰为模板, 经真空冷冻干燥过程制备轻质ZrO₂多孔材料和水玻璃为粘结剂的超轻多孔ZrO₂块材, 研究了其微观结构、形成机理和隔热耐火性能. 结果表明, 冰是一种理想的制作多孔材料的模板, 可同时获得多种尺度的孔结构, 还可获得多孔和层状两种结构复合的微观结构. ZrO₂多孔材料的微观结构为奇特的周期性层状结构. 添加水玻璃作为粘结剂, 制备出多孔和层状两种微结构复合的ZrO₂多孔块材, 在400℃煅烧6 h后仍良好地保持原有的微观结构, 孔隙率达87%, 表观密度仅为0.50 g ? cm^-3, 超轻且机械强度有较大提高, 在1300℃丁烷气火焰灼烧下表现出较好的隔热耐火性能.

关键词 ：无机非金属材料, 氧化锆, 冰为模板, 多孔, 超轻

Abstract：

Porous lightweight ZrO₂ and porous ultralightweight ZrO₂ monolith were prepared via a freeze-drying process using ice as template. The microstructures, formation mechanisms and performances of thermal insulation and fire-resistant were studied. The results indicated that ice is an ideal template for fabrication of porous materials. The obtained porous ZrO₂ with periodical layered microstructures were
lightweight, but with poor strength. After adding sodium silicate as binder, the obtained ZrO₂ monolith has porous and layered hybrid microstructures, which were still kept after calcination at 400 ^oC for 6 h. The calcined ZrO₂ monolith has a porosity of 87%, an apparent density of 0.50 g·cm−3 and high strength. The ZrO2 monolith showed good thermal insulating and fire-resistant properties with 1300^oC butane gas flame.

收稿日期: 2008-12-24

ZTFLH:

O611

基金资助:

中国科学院“百人计划”, 重大科学研究计划2006CB933000, 中国科学院院长基金资助项目.

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