Synthesis, Microstructural Characterization, and Mechanical Property Evaluation of Vacuum Plasma Sprayed Tantalum Carbide

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Tantalum carbide (TaC) is an ultra-high-temperature ceramic for potential applications as protective coating, furnace components, propulsion liners for space shuttles and aircrafts, etc. Microstructural and mechanical behavior of vacuum plasma-sprayed (VPS) TaC has been investigated in the present study. Apart from major TaC phase, microstructural definitions elucidated Ta2C, non-stoichiometric TaCx phases (0.83≤x≤0.94), partial grain formation, polygonization of grains, and inhomogeneous C/Ta ratios in the sprayed structure. Near-isotropy in the fracture–toughness ratio (Kaxial/Ktrans=1.01) is attributed to compact coating, fine-closed porosity, and distribution of non-stoichiometric phases.

Document Type: Research Article


Affiliations: 1: Mechanical and Materials Engineering, Florida International University, Miami, Florida 33174 2: Plasma Processes Inc., Huntsville, Alabama 35811 3: Advance Material Process and Analysis Center (AMPAC), Department of Mechanical, Materials and Aerospace Engineering (MMAE), University of Central Florida, Orlando, Florida 32816

Publication date: April 1, 2006

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