硅酸盐学报2013，Vol.41Issue(2)：140-144,5.DOI:10.7521/j.issn.0454-5648.2013.02.03
多层低温流延法制备片状氧化铝多孔陶瓷
Fabrication of Alumina Porous Ceramics Substrate by Multilayer Freeze-tape-casting Process
摘要
Abstract
In order to avoid co-firing and reduce the cracking failure caused by different expansion rates of metal/ceramic composite heat sink, a method for the production of highly aligned porous ceramics substrate by multilayer freeze-tape-casting process with aqueous alumina slurry was proposed The effects of solid content and freezing temperature on the porosity and pore size were investigated, and the pore morphology (e.g., degree of pore alignment, pore size and interconnection between the pores) of the fabricated samples was characterized by field emission scanning electron microscopy. Furthermore, the thermal fatigue properties of porous ceramic substrate were also examined. The results show that the porosity (volume fraction) gradually decreases from 62.1% to 51.4% with the increase of solid content (mass fraction) from 30% to 40%, and the pore size decreases gradually with the decrease of freezing temperature from -15 ℃ to -45℃. The optimum thermal fatigue properties were obtained at the solid content of 40% and the freezing temperature of -45℃. Also, the pore channels between the layers of ceramic substrate produced by multilayer freeze-tape-casting process could be connected.关键词
冷冻干燥/流延成型/氧化铝/多孔陶瓷Key words
freeze-drying/ tape casting/ alumina/ porous ceramics引用本文复制引用
韩沈丹,赵康,汤玉斐,徐雷..多层低温流延法制备片状氧化铝多孔陶瓷[J].硅酸盐学报,2013,41(2):140-144,5.基金项目
国家自然科学基金(51172179)资助项目. （51172179）
