Combustion synthesis method for synthesis of aluminum nitride powder using aluminum contauners (II)
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method for synthesis of aluminum nitride powder using aluminum containers (II) ChunNan Lin and ShyanLung Chung Journal of Materials Research / Volume 19 / Issue 10 / 2004, pp 3037 3045 DOI: 10.1557/JMR.2004.0400
Link to this article: http://journals.cambridge.org/abstract_S0884291400086970 How to cite this article: ChunNan Lin and ShyanLung Chung (2004). Combustion synthesis method for synthesis of aluminum nitride powder using aluminum containers (II). Journal of Materials Research,19, pp 30373045 doi:10.1557/JMR.2004.0400 Request Permissions : Click here
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Combustion synthesis method for synthesis of aluminum nitride powder using aluminum containers (II) Chun-Nan Lin and Shyan-Lung Chunga) Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China (Received 17 February 2004; accepted 9 July 2004)
A combustion synthesis method was developed for synthesis of AlN powder. Al powder and small amounts of urea were thoroughly mixed and placed in aluminum containers. A layer of AlN powder was placed on the top of the reactant powders and in between the reactant powders and the container walls. The combustion reaction was ignited by heating the top surface of the powder stack and the aluminum container was converted completely to AlN during combustion reaction. High product yields (∼99.5%) were obtained under N2 pressures of 0.3–0.5 MPa. The product as synthesized is porous and loose and can be easily ground. A quenching technique was developed and formation of the various types of product morphology was investigated. Effects of several process parameters on the product yield were also studied. These results were reported and discussed.
I. INTRODUCTION
Aluminum nitride possesses many unique properties such as high thermal conductivity, high electrical resistivity, low thermal expansion coefficient, moderately low dielectric constant, good thermal shock resistance, and good corrosion resistance.1,2 It has been considered for many applications such as substrates for power electronics, an insulating material for radio frequency and microwave packages, an electrostatic chuck dielectric for semiconductor processing, heat sinks for mainframes of super-computers, high thermally conductive composite materials, and hardware for containing or processing molten metals and salts.3,4 In spite of many desirable properties, AlN has not yet been used widely in industries mainly because of its high market prices due to high production costs. Development of new processes for producing AlN powder at low cost is thus an interesting research topic. Our research objective has been to investigate the use of a combustion synthesis method self-propagating high-temperature synthesis (SHS) for the production of AlN powder. The SHS method, originally developed in the former USSR,5 has been applied to synthesis of various materials including ceramics, intermetallics, and composites. Many combustion
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