Considering the importance and application of ultrahigh temperature ceramics in oxidizing environments, this research, effect ZrC content spark plasma sintering parameters (temperature, time pressure) on oxidation response ZrB2–SiC composites has been investigated. After fabricating ternary composite samples different SPS conditions with amounts ZrC, post-sintering process was carried out a box...

Refractory diboride with silicon carbide additive has a unique oxide scale microstructure with two condensed oxide phases (solid+liquid), and demonstrates oxidation resistance superior to either monolithic diboride or silicon carbide. We rationalize that this is because the silica-rich liquid phase can retreat outward to remove the high SiO gas volatility region, while still holding onto the zi...

Microstructure and thermal stability of ZrN/ZrB2 bilayer deposited on GaN have been studied using transmission electron microscopy methods (TEM) and secondary ion mass spectrometry (SIMS). It has been demonstrated that annealing of the contact structure at 1100C in N2 atmosphere does not lead to any observable metal/ semiconductor interaction. In contrast, a failure of the integrity of ZrN/ZrB2...

Over the last decade attempts have been made to fabricate aluminum matrix composites (AMCs) reinforced with several ceramic particles. Aluminum reinforced with ZrB2 particles is one such AMC. The successful application of new kind of AMCs lies in the development of secondary processes such as machining and joining. Friction stir welding (FSW) is a relatively new solid state welding which overco...

The impact of Si3N4 content on the hardness and microstructural developments ZrB2-SiC material has been investigated thoroughly in present investigation. Having prepared raw materials a jar mill, samples containing various amounts were hot-pressed at 1850 °C. Furthermore, XRD, FESEM, HRTEM utilized to evaluate microstructure samples. formation in-situ h-BN was proved by mentioned methods. Also,...

Activating the plasticity of ZrB2 is a promising approach to improve its key properties for applications in hypersonic vehicles, including high temperature strength and thermal shock resistance. The present work demonstrates that ideal shear strength of ZrB2, which is a good indicator of the critical stress for dislocation nucleation, can be significantly reduced by dissolving of appropriate al...