Characterization on Microstructure Homogeneity of θ-Al2O3 Powder Systems During Phase Transformation |
| Journal |
Key Engineering Materials (Volume 351) |
| Volume |
Composite Materials V |
| Edited by |
Di Zhang, Jingkun Guo and Chi Y. A. Tsao |
| Pages |
81-87 |
| DOI |
10.4028/www.scientific.net/KEM.351.81 |
| Online since |
October, 2007 |
| Authors |
Fu Su Yen,
Pei Ling Chang,
Pei Ching Yu,
Rong Jeh Yang
|
| Keywords |
Aluminum, DTA (Differential Thermal Analysis), Nanomaterial, Phase Transformation |
| Abstract |
The traditional differential thermal analysis (DTA) techniques are employed to evaluate
the kinetic behavior induced by the inter-particle relationships in a nano-particle θ-Al2O3 powder
system during θ- to α- phase transformation. Discrepancies in homogeneity and inter-particle
distance of the powder system may result in the diagnostic DTA profiles which can be use to
evaluate the characteristics of the powder system as well as the formed α-Al2O3 particles. Based on
the acknowledgement, a quasi-homogeneous transformation shows that a duration of 90 seconds is
needed for one θ-crystallite to transform into one α-nucleus with a heating rate of 10 oC min-1 and
fabrication of the high phase-pure and mono-sized α-Al2O3 powders is obtained. |
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