| Abstract Scope |
Development of next generation ultrahigh temperature (UHT) materials are required for disruptive advancements in several application spaces such as hypersonics and nuclear reactor technology. However, traditional material processing techniques, such as hot isostatic pressing, have challenges densifying components with optimized microstructures. These simplistic manufacturing techniques reduce processing flexibility associated with optimizing material design to tailor properties and performance. This study investigates field assisted sintering technology (FAST) to rapidly sinter binderless HfC, TaC, and (Hf,Ta)C, and evaluates the effect processing parameters (pressure, temperature, and time) have on structure-property-performance relationships for UHT materials in hypersonic environments. Fabricated FAST samples were characterized to examine microstructure, composition, phase, mechanical properties, oxidation kinetics, and high heat flux tolerance as a function of sample homogeneity. Three-point bend tests, Vickers, and nanoindentation have demonstrated that binderless high density carbides possess superior mechanical performance. The results show FAST is an optimal technique to manufacture next generation UHT materials. |