The incorporation of 1 wt% hexagonal BN (hBN) into ZrB2–30 vol% SiC could noticeably better the fracture toughness, hardness, and consolidation behavior this composite. This research intended to scrutinize effects various amounts hBN (0–5 wt%) on different characteristics ZrB2–SiC materials. hot-pressing method under 10 MPa at 1900 °C for 120 min was employed sinter all designed specimens. Afte...

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 ...

storage of hydrogen is one of the key challenges in developing hydrogen economy. magnesium hydride (mgh2) is an attractive candidate for solid-state hydrogen storage for on-board applications. in this study, 10 wt.% zrb2 was co-milled with magnesium hydride at different milling times to produce nanocrystalline composite powder. the effect of milling time and additive on the hydrogen desorption ...

The elevated temperature thermal properties of zirconium diboride ceramics containing boron carbide additions up to 15 vol% were investigated using a combined experimental and modeling approach. addition B4C led decrease in the ZrB2 grain size from 22 µm for nominally pure 5.4 B4C. measured room conductivity decreased 93 W/m·K 80 also as increased. For ZrB2, was 67 at 2000 °C compared 55 A mode...

Refractory transition-metal (TM) diborides have high melting points, excellent hardness, and good chemical stability. However, these properties are not sufficient for applications involving extreme environments that require mechanical strength as well oxidation corrosion resistance. Here, we study the effect of Cr addition on ZrB2-rich Zr1-xCrxBy thin films grown by hybrid high-power impulse dc...

A comprehensive ab initio analysis of the ultra high temperature ceramics ZrB2 and HfB2 is presented. Density functional theory (DFT) computations were performed for the electronic, mechanical, thermal, and point defect properties of these materials. Lattice constants and elastic constants were determined. Computations of the electronic density of states, band structure, electron localization f...