Abstract
AbstractThis investigation was undertaken to determine the role of carbon additives on the densification behavior and fracture toughness of TaC–HfC ceramic. The composition of TaC‐19 vol% HfC‐5 vol% VC with 10 vol% nano graphite/10 vol% nano carbon black was sintered by hot‐pressing (HP) method. Also, the sintering temperature varied from 1700°C to 2000°C. Vanadium carbide was used as a sintering aid to minimize the porosity for the given hot‐pressing temperatures while keeping the consolidation temperature low. The analysis of XRD patterns revealed that the sintering process led to the formation of a ternary solid solution in the samples accompanied by the entire consumption of HfC and VC phases. Also, the presence of carbon additives increased the relative density from 96% to 100% by enhancing the sintering temperature from 1700°C to 2000°C. It was significantly higher than the carbon‐free sample, which had a maximum value of 96.7% at 2000°C. The results also indicated that the maximum fracture toughness of 7.1 MPa.m1/2 was obtained for nano carbon black contained samples at the sintering temperature of 1900°C and above. The toughening mechanisms in samples were discussed, too.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call