In this study, we examine the possibility to direct combustion synthesize SiC powders from elements using four reactant combinations (Si and graphite; Si and carbon black; ground Si and carbon black; both Si and carbon black ground) under two reacting environments (heated by an oxy-acetylene torch in air, and heated by tungsten coils in vacuum). The experimental results showed that high-purity SiC product with no oxide present was obtained if pellet, made of Si and carbon black, was burned by an oxy-acetylene torch in air. Also, ground reactant particles yielding deteriorated effect on product conversion is also discussed.