Results 61 to 70 of about 113 (106)
Insight into the effect of Ti substitutions on the static oxidation behavior of (Hf,Ti)C at 2500 °C
Advanced Powder MaterialsHf-based carbides are highly desirable candidate materials for oxidizing environments above 2000 °C. However, the static oxidation behavior at their potential service temperatures remains unclear.
Shiyan Chen +8 more
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, 2009 The high melting temperature of ultra-high temperature ceramics (UHTCs) makes ZrB2-based composites potential candidates for aerospace applications. Full densification of these composites faces major challenge due to the strong covalent bonding and the high-melting point, although with additions of SiC, ZrC, MoSi2, etc. densification can be achieved at
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Ultra-high Temperature Ceramics-Ceramic Matrix Composites (UHTC-CMC)
Composites Research, 2017 Sea-Hoon Lee, Feng Lun, Kyeongwoon Chung
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Polymer-Derived Ultra-High Temperature Ceramics (UHTCs) and Related Materials [PDF]
PoliTO Springer Series, 2021 International ...
Emanuel Ionescu +2 more
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Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials [PDF]
Advanced Engineering Materials, 2019 Ultra‐high temperature ceramics (UHTCs) represent an emerging class of materials capable of providing mechanical stability and heat dissipation upon operation in extreme environments, e.g., extreme heat fluxes, chemically reactive plasma conditions.
Emanuel Ionescu +2 more
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DAMAGE AND FAILURE ANALYSIS OF ULTRA-HIGH TEMPERATURE CERAMICS (UHTCS) SUBJECTED TO THERMAL SHOCK
American Society for Composites 2022, 2022In this study, the finite element analysis (FEA) software ABAQUS 2020 and the eXtended Finite Element Method (XFEM) were used to predict the crack initiation and propagation within a UHTC subjected to cold thermal shock from 2000°C to 20°C. Within the XFEM enriched region, the maximum principal stress damage criterion was implemented to capture the ...
EDGAR AVALOS, ALEJANDRA G. CASTELLANOS
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Ultra-High Temperature Ceramics (UHTCs) via Reactive Sintering
Key Engineering Materials, 2007Current high temperature ceramics, such as ZrO2, Si3N4 and SiC, cannot be used at temperatures over 1600°C due to their low melting temperature or dissociation temperature. For ultrahigh temperature applications over 1800°C, materials with high melting points, high phase composition stability, high thermal conductivity, good thermal shock and oxidation
Guo Jun Zhang +3 more
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Materialia, 2021
Abstract The resistance of ultra-high temperature ceramic (UHTC) borides to calcia-magnesia-alumina-silicate (CMAS) attack is evaluated for the first time. ZrB2 and HfB2 are reacted with 23 mol% of CMAS 1000 °C, 1300 °C and 1600 °C, respectively, for 1 h, 10 h and 100 h, respectively, in atmosphere.
Andy Nieto +3 more
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Abstract The resistance of ultra-high temperature ceramic (UHTC) borides to calcia-magnesia-alumina-silicate (CMAS) attack is evaluated for the first time. ZrB2 and HfB2 are reacted with 23 mol% of CMAS 1000 °C, 1300 °C and 1600 °C, respectively, for 1 h, 10 h and 100 h, respectively, in atmosphere.
Andy Nieto +3 more
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Efficient Synthesis/Sintering Routes To Obtain Fully Dense Ultra-High-Temperature Ceramics (UHTCs)
Industrial & Engineering Chemistry Research, 2007Two different synthesis/sintering routes are proposed in this work for the preparation of fully dense 2ZrB2−SiC ultra-high-temperature ceramic (UHTC) composites. Both processes start from commercial powders of zirconium, boron carbide (B4C), and silicon, and both take advantage of the spark plasma sintering (SPS) apparatus. In the first synthesis route,
LICHERI, ROBERTA +3 more
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