Behavior of HfB2–30 vol% SiC UHTC obtained by sol–gel approach in the supersonic airflow
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Sol-Gel Science and Technology"
DOI: 10.1007/s10971-019-05029-9
Abstract: Using the sol–gel process, a composite powder of HfB2–(SiO2–C) composition was synthesized and then utilized for reactive sintering (hot pressing, 30 MPa; 1800 °C, 15 min) of ultra-high-temperature ceramic HfB2–30 vol% SiC composites. It was established that nanocrystalline silicon… read more here.
Keywords: hfb2 vol; vol sic; spectroscopy; hfb2 ... See more keywords
Shrinkage, hardness and fracture toughness of ternary ZrB2–SiC-HfB2 composite with different amount of HfB2
Sign Up to like & getrecommendations! Published in 2019 at "Materials Chemistry and Physics"
DOI: 10.1016/j.matchemphys.2019.05.094
Abstract: Abstract Ternary ZrB2–SiC-HfB2 composites with different amount of 4, 8 and 12 vol% HfB2 were consolidated at 1800 °C, 9 min and 30 MPa SPS conditions. Microstructural evaluations were done by scanning electron microscopic (SEM). Densification was measured by… read more here.
Keywords: fracture toughness; hfb2; zrb2 sic; ternary zrb2 ... See more keywords
Dense HfB2 ceramics fabricated by high-energy ball milling and spark plasma sintering
Sign Up to like & getrecommendations! Published in 2021 at "Materials Chemistry and Physics"
DOI: 10.1016/j.matchemphys.2020.123845
Abstract: Abstract The effects of high-energy ball milling (HEBM) on the sintering ability and microstructure of hafnium diboride (HfB2) ultrahigh-temperature ceramics (UHTCs) were investigated. After HEBM, the average particle size range of the HfB2 ceramics decreased… read more here.
Keywords: energy ball; high energy; hfb2 ceramics; hfb2 ... See more keywords
Bottom-Up Synthesis and Mechanical Behavior of Refractory Coatings Made of Carbon Nanotube-Hafnium Diboride Composites.
Sign Up to like & getrecommendations! Published in 2019 at "ACS applied materials & interfaces"
DOI: 10.1021/acsami.8b18840
Abstract: We use aligned carbon nanotube (CNT) forests as scaffolds to deposit hafnium diboride (HfB2) and fabricate millimeter-thick ultrahigh-temperature composite coating. HfB2 has a melting temperature of 3250 °C, which makes it an attractive candidate for… read more here.
Keywords: hafnium diboride; hfb2; cnt; carbon nanotube ... See more keywords
Reverse electron transfer in Ru/HfB2 drives selective hydrogenation via strong metal-support coupling.
Sign Up to like & getrecommendations! Published in 2025 at "Chemical communications"
DOI: 10.1039/d5cc03876f
Abstract: Benzoic acid hydrogenation faces a persistent activity-selectivity trade-off. Ru/HfB2 overcomes this challenge via strong metal-support interactions that generate electron-rich Ruδ- sites, enabling >99% conversion and selectivity under optimized conditions. read more here.
Keywords: hydrogenation; via strong; hfb2; strong metal ... See more keywords
Epitaxial growth of HfB2 thin films on Si(111) by magnetron sputtering
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Applied Physics"
DOI: 10.1063/5.0207776
Abstract: Hafnium diboride (HfB2) is a promising candidate as a seed layer for GaN growth on Si substrates due to its excellent lattice and thermal coefficients matching with both materials. This work investigates the epitaxial growth… read more here.
Keywords: films 111; thin films; hfb2; epitaxial growth ... See more keywords
Oxidation response of a SiCf/SiC CMC with a HfB2-based coating in an arc jet test
Sign Up to like & getrecommendations! Published in 2018 at "Advances in Applied Ceramics"
DOI: 10.1080/17436753.2018.1509174
Abstract: ABSTRACT The behaviour of a SiC-fibre-reinforced composite with a graded matrix was investigated in an arc jet facility. The graded matrix was comprised of several layers of silicon carbide that transition to a mixed SiC-HfB2… read more here.
Keywords: oxidation response; jet; response sicf; hfb2 ... See more keywords
Thermal Expansion of Micro- and Nanocrystalline HfB2
Sign Up to like & getrecommendations! Published in 2019 at "High Temperature"
DOI: 10.1134/s0018151x18050164
Abstract: Hafnium diboride nano- and microcrystals are studied by high-temperature X-ray diffraction in the temperature range of 300–1500 K. HfB2 nanocrystals are found to have a greater thermal expansion coefficient than HfB2 microcrystals. The thermal expansion… read more here.
Keywords: thermal expansion; micro nanocrystalline; hfb2; nanocrystalline hfb2 ... See more keywords
Oxidation of Porous HfB2–SiC Ultra-High-Temperature Ceramic Materials Rich in Silicon Carbide (65 vol %) by a Supersonic Air Flow
Sign Up to like & getrecommendations! Published in 2020 at "Russian Journal of Inorganic Chemistry"
DOI: 10.1134/s0036023620040191
Abstract: Porous HfB2–65 vol % SiC samples (porosity 34.5%) were produced by reactive hot pressing of HfB2–(SiO2–C) composite powder at 1800°C (heating rate 10 deg/min, holding duration 15 min) and 30 MPa. Using a high-temperature induction… read more here.
Keywords: oxidation; vol; temperature; high temperature ... See more keywords
Modification of Thermo-Chemical Properties of Hot-Pressed ZrB2-HfB2 Composites by Incorporation of Carbides (SiC, B4C, and WC) or Silicides (MoSi2 and CrSi2) Additives
Sign Up to like & getrecommendations! Published in 2025 at "Materials"
DOI: 10.3390/ma18163761
Abstract: ZrB2-HfB2 composites allow us to obtain materials characterized by the high chemical resistance characteristic of HfB2 while reducing density and improving sinterability due to the presence of ZrB2. Since boride composites are difficult-to-sinter materials. One… read more here.
Keywords: chemical properties; hfb2 composites; thermo chemical; hfb2 ... See more keywords