Abstract
An attempt was made to fabricate ZrN1-xCx and TaN1-xCx (0≤x≤1.0) ceramics without additives in order to obtain highly pure and dense polycrystalline anion-substituted materials by high pressure reaction hot-pressing.Compositional and temperature dependences of Vickers microhardness, fracture toughness and thermal conductivity of ZrN-ZrC and TaN-TaC systems were examined. The compositional dependence of lattice constant of ZrN1-xCx obeyed Vegard's law. The full solid solution of TaN1-xCx could not be synthesized, but a partial solid solution system with the composition range of 0.3≤x≤1.0 was prepared. The microhardness of ZrN1-xCx decreased with increasing nitrogen content, but the microhardness of TaN1-xCx increased with nitrogen content. The fracture toughness of ZrN1-xCx decreased linearly from 4.6 to 3.3MN/m3/2 with increasing mole fraction X. Little change in KIc of TaN1-xCx was observed at the range of 0.3≤x≤1.0 and the value of KIc was 4.5MN/m3/2. The thermal conductivity of ZrN1-xCx at room temperature decreased continuously with increasing X. But the thermal conductivity of TaN1-xCx decreased rapidly with increasing carbon content and reached the minimum value at TaN0.5C0.5, and then increased with increasing amount of carbon.
Sign-in/Register to access full text options 
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 callMore From: Journal of the Society of Materials Science, Japan
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
