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Stoichiometric Tantalum carbide (TaC) ceramics were prepared by reaction spark plasma sintering using 0.333–2.50mol% Si3N4 as sintering aid. Effects of the Si3N4 addition on densification, microstructure and mechanical properties of the TaC ceramics were investigated. Si3N4 reacted with TaC and tantalum oxides such as Ta2O5 to form a small concentration of tantalum silicides, SiC and SiO2, with significant...
Silicon nitride (Si3N4) was synthesized under a nitrogen gas flow (100mL/min) using a molten salt nitriding method to investigate the effects of the temperature and NaCl content on the α-Si3N4 content in products and their micro-morphologies. Adding NaCl and β-Si3N4 in silicon powders resulted in Si nitridation products divided into two layers. Analysis of the lower product using X-ray diffraction...
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