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
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