Title: Synthesis of aluminium nitride under 2.45 GHz microwave irradiation

Authors: Yuta Tamba; Yamato Hayashi; Hirotsugu Takizawa

Addresses: School of Engineering, Tohoku University, 6-6-07 Aoba Aramaki, Aoba-ku, Sendai 980-8579, Japan. ' School of Engineering, Tohoku University, 6-6-07 Aoba Aramaki, Aoba-ku, Sendai 980-8579, Japan. ' School of Engineering, Tohoku University, 6-6-07 Aoba Aramaki, Aoba-ku, Sendai 980-8579, Japan

Abstract: Aluminium nitride (AlN) is a functional ceramic which has several properties, and it is applied to substrate materials and fillers for packaging materials of electronic devices. Microwave heating has characteristics such as internal heating, rapid heating and selective heating, so it is useful for synthesis of ceramics. In this work, spherical AlN particles were synthesised by carbothermal reduction and nitridation of Al₂O₃ under 2.45 GHz microwave irradiation. The mixture of spherical Al₂O₃ particles and carbon was used as the starting materials. Carbon absorbed microwaves selectively, and the starting materials were heated rapidly in flowing nitrogen gas. Al₂O₃ was converted to AlN in a short time; and finally, polycrystalline spherical AlN particles were successfully formed. They retained particle diameters of spherical Al₂O₃ particles used as the starting material.

Keywords: spherical particles; aluminium nitride; carbothermal reduction; carbothermal nitridation; microwave heating; synthesis; microwave irradiation; ceramics; polycrystalline particles; nanotechnology.

DOI: 10.1504/IJNT.2013.050882

International Journal of Nanotechnology, 2013 Vol.10 No.1/2, pp.63 - 70

Published online: 07 Dec 2012 *

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