Preparation of aluminum nitride fibers from alumina gel fibers by nitridation in ammonia |
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Authors: | Li Zhang Li Tong Zhang Jing He Zhi Jun Lin Yan Jiang Li Fu Chen |
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Affiliation: | 1. National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi’an, 710072, China 2. Advanced Materials Laboratory, College of Materials, Xiamen University, Xiamen, 361005, China
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Abstract: | 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 (γ-Al2O3 to α-Al2O3) and nitridation reaction took place above 1,100 °C for pure alumina fiber. The addition of a small amount of silica (3 wt%) suppressed the formation of α-Al2O3 and preserved the highly reactive metastable alumina, and nitridation rate was enhanced. Fine grain (~20 nm) AlN fibers were obtained for pyrolysis at 1,150–1,250 °C for 3 h in ammonia, and AlN was identified as the sole crystalline phase. |
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