Abstract
Hafnium carbide (HfC) is studied as a promising material for aerospace application at ultra‐high temperatures. The protective HfC coating is deposited on carbon fiber at 1200 °C using a chemical vapor deposition method. Thermodynamic calculation is carried out to optimize process variables in the HfCl4–C3H6–H2 system. H2 partial pressure in the system has a significant effect on the yield, composition, and morphology of the HfC coating. When the ratio of H2/(HfCl4 + C3H6) is high, a single HfC phase with a porous structure is deposited because of the growth of HfC nanorods. On the other hand, a highly crystalline dense HfC, which contains a small amount excess carbon, is uniformly deposited on the carbon fiber woven fabric at a low H2/(HfCl4 + C3H6) ratio.
Published Version
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