Preparation of Ceramic Nitride-Carbide Composition AlN–SiC by SHS Method Using Halide Salt and Sodium Azide

Abstract

The advantages of composite nitride-carbide ceramics AlN–SiC are presented, which along with good thermal conductivity and corrosion resistance of aluminum nitride has significantly better mechanical characteristics and is promising for use not only in the metallurgy and mechanical engineering as a structural material working under mechanical load at high temperatures, but also in electronics as a new high-temperature ceramics for various purposes. It is shown that the modern method of self-propagating high-temperature synthesis (SHS), which is also called combustion Synthesis, is more cost-effective and attractive for producing a powder composition of AlN-SiC, compared to other traditional more complex and energy-intensive methods. The well-known varieties of using the SHS method for obtaining AlN-SiC, their advantages and disadvantages are listed. The possibility of preparation of ceramic nitride-carbide powder composition AlN–SiC by the method of azide SHS during the combustion of powders mixtures of Al, Si, C, sodium azide NaN3and halide salt (NH4)2SiF6is studied using a thermodynamic calculation and an experimental study of the temperature and composition of combustion products.