Comparison of the oxidation behaviour of two dense hot isostatically pressed tantalum carbide (TaC and Ta2C) Materials

Mechanisms of pore formation in high-temperature carbides: Case study of TaC prepared by spark plasma sintering

“…The evolution of the oxygen impurity during this process was described in our previous research [37], and a detailed summary based on this study follows with support from the literature. X-ray diffraction analysis of a sample quenched at 1073 K demonstrated that significant amounts of crystalline b-Ta 2 O 5 developed, which is consistent with temperatures reported in the literature for an interfacial reaction that is facilitated by first dissolving oxygen into the TaC lattice followed by precipitation of the oxide phase and free carbon [73,74]. When quenching from temperatures of 1373-1773 K, X-ray diffraction demonstrated that the high-temperature polymorph, a-Ta 2 O 5 , was also present and indicated conversion from b-Ta 2 O 5 .…”

Thermal Analysis of Tantalum Carbide-Hafnium Carbide Solid Solutions from Room Temperature to 1400 °C

“…Further delay was observed in T50H50, where the onset oxidation temperature was around 940 °C. The oxidation process of pure TaC matches the literature description [19,20]. The degree of oxidation increases sharply around 750 °C and is completed near 950 °C.…”

“…The oxidation process of pure TaC matches the literature description [19,20]. The degree of oxidation increases sharply around 750 • C and is completed near 950 • C. The transformation from TaC to Ta 2 O 5 involves tremendous volume changes.…”

Combustion synthesis of tantalum carbides TaC and Ta2C

“…The phase diagram of the Ta-C system shows another well-defined carbide, the hemicarbide Ta 2 C. Ta 2 C has a structure based upon a hexagonal closest-packed metal lattice with carbon atoms filling one half of the octahedral holes [3]. Tantalum hemicarbide is also featured by a high melting point of 3327 • C. In addition, the hemicarbide Ta 2 C was found to possess a higher oxidation resistance in comparison to the monocarbide TaC [4].…”