| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 100 === In order to improve the flowability of powder, the spray granulation technique of aluminum nitride(AlN) powder was researched. Due to the advantages of microwave fast heating and energy-saving, the study explored the aluminum nitride powder by microwave sintering. At first, the study discussed the factors that the influences on the appearance of the granulation powder and particle size, such as slurry characteristics and spray granulation process parameters. And then using the single-mode microwave furnace investigated the qualities of the different granulation powder in the different soaking time. For example, shrinkage, the bulk density, secondary phase distribution, microstructure, and thermal conductivity.
The results of the experiment showed that adding ethylcellulose increased the slurry viscosity significantly and improved the hollow appearance of granulation powder. Particle size of granulation powder as the addition of binder and solid content to enhance and larger, and is inversely proportional to the rotational speed of atomizer. According to the economic effect, the study showed the results of using 2wt.% binder (B-03HX), 0.4wt.% dispersant(TEP), 0.75wt.% ethylcellulose, and 60wt.% solid content. And the thermal conductivity of the spherical granulation powder was measured 172W/m-K under the nitrogen atmosphere with a sintering temperature of 1750℃, and soaking time of 180 minutes.
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