研究与评论:材料科学杂雷竞技苹果下载志
菜单ISSN: 2321 - 6212
ISSN: 2321 - 6212
N. Thamarai Selvi和Parag Bhargava
印度理工学院孟买分校
海报和接受的摘要:Res. Rev. J Mat. science
DOI:10.4172 / 2321 - 6212 c1 - 015
问题陈述:陶瓷纤维(微米或纳米直径)由于其特殊的隔热性能，如低热质量，低热导率等，正被用于取代传统的耐火砖。合成纤维有高温法和低温法。但是低温方法节省了大量的能源。因此，选择溶胶-凝胶离心纺丝法合成纤维。本研究的目的是合成氧化铝氧化锆(稳定和不稳定)纤维，并了解晶粒生长的控制机制。方法与理论方向:采用离心纺丝溶胶-凝胶法合成氧化锆纤维(氧化锆含量为5 ~ 20 wt. %)。单片氧化铝纤维的平均晶粒尺寸为~4 μ m，这是一个巨大的晶粒尺寸，它会降低力学性能。因此加入氧化锆来控制晶粒的生长。结果:纤维直径在5 ~ 15µm之间。90 μ m筛分后纤维指数在96%左右。 SEM images confirmed that the fibers were devoid of any abnormal grains (Fig. 1 (a-d)). Average alumina grain size was ~ 4 µm. Alumina fibers with zirconia showed homogeneous distribution of zirconia throughout the fibers (Fig. 1 (b-d)). It was also confirmed that zirconia controlled the growth by triple junction pinning effect which is in good agreement with the mechanisms reported. With the increase of zirconia content from 5 wt. % to 20 wt. % more number of grain boundary junctions are pinned which controls the grain boundary mobility effectively. Conclusion & Significance: Alumina zirconia fibers of 5-15 µm dia. were synthesized using sol-gel with centrifugal spinning. Average alumina grain size was ~ 4 µm. This got reduced to 2.8 µm and 1.1 µm respectively for 5 and 20 wt. % and it varied in between for 10 and 15 wt. % zirconia Zirconia controlled the growth by secondary phase pinning which is in good agreement with the mechanisms reported.(电子邮件保护)
