Preparation of aluminum nitride fibers from alumina gel fibers by nitridation in ammonia

被引：4

作者：

Zhang, Li ^{[1
]}

Zhang, Li Tong ^{[1
]}

He, Jing ^{[2
]}

Lin, Zhi Jun ^{[2
]}

Jiang, Yan ^{[2
]}

Chen, Li Fu ^{[2
]}

机构：

[1] Northwestern Polytech Univ, Natl Key Lab Thermostruct Composite Mat, Xian 710072, Peoples R China

[2] Xiamen Univ, Coll Mat, Adv Mat Lab, Xiamen 361005, Peoples R China

来源：

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2013年 / 68卷 / 01期

关键词：

Sol-gel processes; Fibers; Aluminum nitride; Silica; GAS-REDUCTION-NITRIDATION; CARBOTHERMAL REDUCTION; RAW-MATERIAL; AIN POWDER;

D O I：

10.1007/s10971-013-3127-1

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Aluminum nitride (AlN) fibers were prepared from alumina gel fibers and by heat-treatment in ammonia. The influence of silica on the formation of AlN was investigated. It was shown that phase transformation of alumina (gamma-Al2O3 to alpha-Al2O3) and nitridation reaction took place above 1,100 A degrees C for pure alumina fiber. The addition of a small amount of silica (3 wt%) suppressed the formation of alpha-Al2O3 and preserved the highly reactive metastable alumina, and nitridation rate was enhanced. Fine grain (similar to 20 nm) AlN fibers were obtained for pyrolysis at 1,150-1,250 A degrees C for 3 h in ammonia, and AlN was identified as the sole crystalline phase.

引用

页码：150 / 154

页数：5

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