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Production of UHTC Complex Shapes and Architectures
2013In spite of the difficult sinterability of Zr and Hf borides and carbides, recent results highlight that these ceramics can be produced with full density, fine microstructure, and controlled mechanical and thermal properties, through different procedures: pressureless sintering and hot pressing with proper sintering aids, reactive synthesis/sintering ...
Valentina Medri +2 more
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Ultrahigh-Temperature Ceramics (UHTCs) Systems
2018Phase diagrams of diborides (MB2), monocarbides (MC), and mononitrides (MN) of transitive metals in IVB or VB groups, such as Ti, Zr, Hf, Nb, and Ta, most of which belong to the Ultrahigh-Temperature Ceramic (UHTC) family, are collected in this chapter. Phase diagrams of UHTCs are scarce relative to common oxides, carbides, or nitrides.
Zhenkun Huang, Laner Wu
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TEM study on UHTCs and composites
2016Research on UHTCs has generally involved two major fields: the improvement of mechanical properties and the oxidation resistance. High performances are achieved upon careful tailoring of the microstructure, obtained through an aware control of the sintering additives, secondary phases and densification process.
Laura Silvestroni +3 more
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Production and characterization of toughened UHTC
2011Ultra-high temperature ceramics are material candidate for application in aggressive environment, especially in sharp components of future generation of space vehicles, driven by the ultimate goal of major speed with new propulsion and hypersonic models.
Silvestroni, Laura +4 more
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Sintering and densification of UHTCs
2012UHTCs possess outstanding physical and engineering properties, such as high hardness and strength, low electrical resistivity and good chemical inertness. The extremely high melting point and the low self-diffusion coefficient make these materials very difficult to sinter to full density: temperatures above 2000°C and the application of pressure are ...
Diletta Sciti +3 more
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First principle study of UHTC ternary diboride, Cr2AlB2
AIP Conference Proceedings, 2018In this paper ab-initio study of the structural, electronic and optical properties of ternary metal boride Cr2AlB2 using full potential linear augmented plane wave (FP-LAPW) method based on the density functional theory (DFT). The study of structural properties shows that Cr2AlB2 is metallic in nature and have orthorhombic crystal structure.
Anugya Rastogi +2 more
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Processing and sintering of fiber-containing UHTCs
2014Ultra high temperature ceramics (UHTC) include borides and carbides of early transition metals and are presently considered a class of promising materials for several applications, the most appealing ones being in the aerospace and energy sectors. Crucial issues for application in severe environment is the improvement of fracture toughness and thermal ...
D. Sciti +3 more
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Amorphization, Field Activated Sintering and Superplastic Forming of UHTCs
Advances in Science and Technology, 2014This article reports new events of amorphization, field activated sintering and superplastic forming of ultrahigh temperature ceramics (UHTCs), in order to provide an advanced method of the integrated material design and solid state synthesis on demand in the framework of material system science and technology.
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Development of UHTCs and coatings on their basis for TPS applications
2016Thanks to their extremely high melting point above 3000°C and their unique combination of thermo-physical and engineering properties, ultra-high temperature ceramics (UHTCs) and coatings on their basis are envisaged as promising candidates for application at very high temperature.
M Parco +7 more
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