Article ID Journal Published Year Pages File Type
8029321 Surface and Coatings Technology 2013 5 Pages PDF
Abstract
Ultrafine bamboo-shaped SiC rod-reinforced HfC ceramic coating was fabricated on carbon/carbon (C/C) composites by a simple method, which consists of first fabricating a porous layer with ultrafine bamboo-shaped SiC rods on C/C composites and then depositing HfC ceramic into the porous layer using a two-step chemical vapor deposition technique. The ultrafine bamboo-shaped SiC rods could be well dispersed in the coating, which significantly improved the mechanical properties of the coating and the bonding strength between C/C composites and coating, avoiding the cracking and debonding of the coating. The results showed that the hardness, elastic modulus, and fracture toughness of the coating increased by 21%, 42%, and 106%, respectively, and the bonding strength between C/C composites and coating increased by 30 times due to the incorporation of the ultrafine bamboo-shaped SiC rods. Most interestingly, a novel reinforcing and toughening mechanism is observed that shows the ultrafine bamboo-shaped SiC rods anchoring themselves into the ceramic matrix to effectively transfer load from the matrix to the rods by the mechanical interlocking between the nodes and the surrounding matrix.
Related Topics
Physical Sciences and Engineering Materials Science Nanotechnology
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