A ZrB2-based ceramic, containing short Hi-Nicalon SiC fibers, was fabricated with a Mo-impermeable buffer layer sandwiched between bulk and the outermost oxidation resistant ZrB2–MoSi2 layer, in order to prevent inward Mo diffusion associated fiber degradation reactions. This additional consisted of ZrB2 doped either Si3N4 or polymer-derived ceramics (PDCs) SiCN SiHfBCN. Scanning electron micro...

In aerospace applications the development of a reliable method of structural health monitoring (SHM) is one of the most important keys in maintaining the integrity and safety of structures, preventing catastrophic failure. The research program DEDALO aims at developing a real size UHTC-based prototype with a complex shape equipped with a SHM system for damage detection. A multidisciplinary appr...

ZrB2-SiC ceramics and Nb alloy were brazed at 1160°C for 60 min with CoFeNiCrCuTix high-entropy filler. The influence of Ti content on the interface structure mechanical properties ZrB2-SiC/Nb joint was systematically studied. It is found that rich-Ti Laves phase formed due to addition large atomic size fill into filler or brazing joint, its increases content. by alloys without can be divided a...

The focus of the present work is investigation influence polymer-derived ceramics, used as sintering aids for preparing ZrB2-based monoliths, on their high-temperature oxidation behavior. For preparation ZrB2 powder was coated with SiCN, SiZrCN, or SiZrBCN and subsequently densified via hot-pressing at temperatures low 1800°C. To investigate kinetics, thermogravimetric analysis (TGA) performed ...

This study examines the effects of different ZrB2 content on various mechanical properties and electrical conductivity of ZrB2/Y-TZP composite. Composites with ZrB2 content of up to 20 wt-% were particularly beneficial at the lower sintering temperature range by achieving greater densification and better hardness than Y-TZP monolith. In contrast to the trends estimated from rule of mixture, the...

In order to clearly understand the details of ZrO₂ formation during ablation, high intensity continuous laser was chosen to irradiate ZrB₂/SiC. The results reveal that there are two different modes of ZrO₂ formation depending on whether liquid SiO₂ is present. When liquid SiO₂ is present, ZrO₂ generated by the oxidation of ZrB₂ is firstly dissolved into SiO₂. Then, ZrO₂ will precipitate again, ...