Results 111 to 120 of about 201 (153)
Multimatrix Composite Materials for Rocket Nozzle Manufacturing: A Comparative Review. [PDF]
Polymers (Basel)Meiirbekov M +7 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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54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2013
The purpose of this paper is to present a general overview of a re-entry space vehicle study and a synthesis of the methodologies developed as well as the main results obtained. The final objective is to give a contribution to implement and evaluate the thermo-structural performance of a pair of Ultra High Temperature Ceramic (UHTC) winglets developed ...
Roberto Scigliano +2 more
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The purpose of this paper is to present a general overview of a re-entry space vehicle study and a synthesis of the methodologies developed as well as the main results obtained. The final objective is to give a contribution to implement and evaluate the thermo-structural performance of a pair of Ultra High Temperature Ceramic (UHTC) winglets developed ...
Roberto Scigliano +2 more
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Journal of the European Ceramic Society, 2011
Abstract A novel reactive infiltration processing (RIP) technique was employed to infiltrate porous carbon fibre reinforced carbon (C/C) composite hollow tubes with ultra high temperature ceramic (UHTC) particles such as ZrB 2 . The C/C composite tubes had initial porosity of ∼60% with a bimodal (10 μm and 100 μm) pore size distribution.
Daniel Doni Jayaseelan +3 more
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Abstract A novel reactive infiltration processing (RIP) technique was employed to infiltrate porous carbon fibre reinforced carbon (C/C) composite hollow tubes with ultra high temperature ceramic (UHTC) particles such as ZrB 2 . The C/C composite tubes had initial porosity of ∼60% with a bimodal (10 μm and 100 μm) pore size distribution.
Daniel Doni Jayaseelan +3 more
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Mass Production and Assembly of Ultra-High Temperature Ceramic (UHTC) Nanowires: TiC
ECS Meeting AbstractsUltra-high temperature ceramics (UHTCs), typically the non-stoichiometric carbides and nitrides of metal such as Ta, Zr and Ti, have melting temperatures higher than 3000oC.(1) They also have excellent mechanical properties, such as hardness and wear resistance.
Sreeram Vaddiraju +2 more
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