• ZrB2-SiC ceramics were joined using Ni foil filler and spark plasma sintering. Joining mechanisms of identified. Mechanical tests performed to evaluate the mechanical properties fabricated joints. Oxidation behaviour joint was characterised analysed over a wide range temperature. is crucial for ultra-high temperature (UHTCs) be used in demanding environments due difficulty manufacturing large...

As a new category of ultra-high temperature ceramics (UHTCs), multi-anionic high-entropy (HE) carbonitride UHTCs are expected to have better comprehensive performances than conventional UHTCs. However, how realize the green and low-cost synthesis high-quality HE UHTC powders prepare bulk with excellent mechanical properties still faces great challenges. In this work, green, controllable prepara...

Seven equimolar, five-component, metal diborides were fabricated via high-energy ball milling and spark plasma sintering. Six of them, including (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)B2, (Hf0.2Zr0.2Ta0.2Mo0.2Ti0.2)B2, (Hf0.2Zr0.2Mo0.2Nb0.2Ti0.2)B2, (Hf0.2Mo0.2Ta0.2Nb0.2Ti0.2)B2, (Mo0.2Zr0.2Ta0.2Nb0.2Ti0.2)B2, and (Hf0.2Zr0.2Ta0.2Cr0.2Ti0.2)B2, possess virtually one solid-solution boride phase of the hexag...

So far, the studies regarding innovative High-Entropy Borides (HEBs), which belong to more general class of Ultra-high temperature ceramics (UHTCs), have been entirely confined their fabrication or characterization from microstructural, mechanical and oxidation resistance viewpoints. In this work, optical properties two members HEBs, i.e. (Hf0.2Zr0.2Ta0.2Mo0.2Ti0.2)B2 (Hf0.2Nb0.2Ta0.2Mo0.2Ti0.2...

Abstract Ultra‐high temperature ceramics (UHTCs) are a group of advanced ceramic materials that possess excellent high capabilities, which make them especially suitable for extreme environment engineering applications. As an effective assembling method, joining is frequently required fabricating sophisticated structures such applications due to the excessive challenges and costs in producing ne...

Ultra-high temperature ceramics (UHTCs) are most recently getting much attention for structural parts of hypersonic missiles with their cruising speed more than Mach 5. Most the UHTCs poor sinterability carbides, nitrides, and borides. Therefore, they have been studied developed a long time. However, there still many problems to solve. In this paper, based on solid-state reaction presented as a...

Understanding the behavior of ultra-high temperature ceramics (UHTCs) against oxidation is particular importance in high-temperature applications. In this study, ZrB2–SiC–HfB2 UHTC composites were fabricated by spark plasma sintering (SPS) method at different temperatures, times, and pressures to investigate effects process variables on their resistance. Before tests, as-sintered samples contai...

A wider utilization of ultra high temperature ceramics (UHTC) materials strongly depends on the availability of efficient techniques for their fabrication as dense bodies. Based on recent results reported in the literature, it is possible to state that Spark Plasma Sintering (SPS) technology offers a useful contribution in this direction. Along these lines, the use of two different SPS-based pr...

Ultra-high temperature ceramics (UHTCs) are refractory materials with unusual properties making them strong contenders for applications involving adverse and chemically aggressive environments. This paper presents an effort to process UHTCs using additive manufacturing method, specifically Electron Beam Sintering (EBS) - adoption of the powder-bed fusion (PBF) process. Such a shows that process...

This paper presents a simple methodology to perform a high temperature coupled thermo-mechanical test using ultra-high temperature ceramic material specimens (UHTCs), which are equipped with chemical composition gratings sensors (CCGs). The methodology also considers the presence of coupled loading within the response provided by the CCG sensors. The theoretical strain of the UHTCs specimens ca...