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A 6H→3C transformation, which does not commonly occur at high temperatures, was observed in SiC. A 6H-SiC and TiN powder Mixture was hot-pressed in a flowing Ar atmosphere. The starting 6H-SiC powder was completely transformed to 3C polytype above 2200℃, although 3C-SiC was not stable at this temperature. It was found that coexistence of N was essential for this 6H→3C transformation, and a small amount of Ti was detected in the transformed SiC grain. The results suggest that a solution of N or TiN in the SiC grain would transform the 6H-SiC to the 3C form.