Characteristics of aerosol-synthesized AlN particles |
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Authors: | An-Jae Chang Shi-Woo Rhee Sunggi Baik |
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Affiliation: | (1) Department of Materials Science and Engineering, Pohang University of Science and Technology, 790-784 Pohang, Korea;(2) Laboratory for Advanced Materials Processing, Department of Chemical Engineering, Pohang University of Science and Technology, 790-784 Pohang, Korea |
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Abstract: | Particulate characteristics were investigated for AlN synthesized by a thermochemical reaction of aluminium aerosol with ammonia gas. The product powders had a decreasing specific surface area between 15.7 and 36.7 m2g–1, with increasing reaction temperature from 1100–1500 °C, and the powders with large surface area were strongly hygroscopic. Although the powders were severely aggregated and had a small amount of unreacted aluminium, light milling and post heat treatment made them ultrafine and completely converted. When sintered with 0.5% yttrium at 1900 °C, full densification and high thermal conductivity of about 130 Wm–1 K–1 were obtained. |
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