Consolidation and mechanical properties of hot pressed TaC-HfC-VC composites
Source abstract
Abstract
Abstract The need to improve the extremely high melting temperature materials used in hypersonic applications, has led to the search for ultra-high temperature ceramics (UHTCs) such as TaC-based composites. In this study TaC-HfC-VC composites were prepared by hot pressing at 1700–2000 °C for 45 min under a uniaxial pressure of 40 MPa. This work was aimed at studying the effect of VC addition on the microstructure, densification and mechanical properties of TaC-HfC based composites. Microstructure and phase evolution revealed the well-formed solid solution between carbides and thus formation of a monophasic microstructure. The addition of hafnium carbide and vanadium carbide increased the Vickers hardness of the TaC from 15 GPa up to 23 GPa. The highest value of 5.4 MPa m 1/2 was obtained for the fracture toughness of the hot pressed samples. By increasing the hot pressing temperature, due to the grain growth, a decrease in the hardness and fracture toughness of the composites was observed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Metal and Thin Film Mechanics
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