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In-Situ Synthesis of TiC/Ni_3Al Surface Composite Coating
Tang Liping
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Abstract
A TiC/Ni3Al surface composite coating was fabricated on the steel substrate by casting route with self-propagating high-temperature synthesis (SHS). The phases, microstructure and interface morphology of the coating are studied. The results show that the reaction of Ti-C-3Ni-Al system is fully completed with the products of TiC and Ni3Al 1～3μm of TiC particulates are mounted in Ni3Al. With the increase of TiC, TiC has slightly larger dimension and more uniform distribution to form a denser coating. The coating is formed with metallurgical bond between the coating and steel substrate. Interface morphology is varied with the TiC content of the coating. When content of TiC is less than 45wt%, the coating is integrated with graded distribution of Ni, Al, Ti, Fe from the coating to the interface. When content of TiC is equal to or more than 45wt%, the coatings are delaminated.