The effect of SiC content, additives, and process parameters on densification and microstructural properties of pressureless sintered ZrB2– (1–10 wt %) SiC particulate composites have been studied. The ZrB2–SiC composite powders mixed by Spex mixer with 1-2wt% C (added as graphite powder) and CMC have been cold-compacted and sintered in argon environment in the temperature range of 1800–2100ºC ...

Atomistic Green-Kubo simulations are performed to evaluate the lattice thermal conductivity for single crystals of the ultra high temperature ceramics ZrB2 and HfB2 for a range of temperatures. Recently developed interatomic potentials are used for these simulations. Heat current correlation functions show rapid oscillations which can be identified with mixed metal-Boron optical phonon modes. A...

Sintering of ceramics is an energy-consuming process that needs high temperatures, therefore, in the present work; solar energy used to produce temperatures for sintering aim different materials. Solar concentrators increase intensity incident receiver provides temperatures. Ultrahigh-temperature (UHTCs) due their melting point can also be a good alternative In work, ZrB2 introduced as material...

The thermal shock resistance of ceramics depends on not only the mechanical and thermal properties of materials, but also the external constraint and thermal condition. So, in order to study the actual situation in its service process, a temperature-dependent thermal shock resistance model for ultra-high temperature ceramics considering the effects of the thermal environment and external constr...

Thermodynamic Properties of Ultra High Temperature Ceramics (UHTCs) Michael W. Finnis1,, T. Davey1*, A.I. Duff 1,2, T.A. Mellan 1 1Imperial College London, Thomas Young Centre, Dept. of Materials and Dept. of Physics, London, UK 2Hartree Centre, STFC Daresbury Laboratory, Scientific Computing Department, Warrington, UK *Present address: Department of Finemechanics, Fracture and Reliability Rese...