The application of the fast pulse heating method for investigation of carbon-rich side of Zr–C phase diagram under high temperatures

Kondratyev, A. M.; Muboyajan, S. A.; Onufriev, S. V.; Savvatimskiy, A. I.

doi:10.1016/j.jallcom.2014.11.216

Cited by 36 publications

(3 citation statements)

References 10 publications

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“…[79] Recently, a pulsed Joule heating technique was also used on 250 μm thick carbide samples, [82,83] to analyze melting temperature, heat capacity and fusion enthalpy for Zr carbide and nitride. [84,85] The prize for highest melting solid was given to Ta 0.8 Hf 0.2 C in 1930 by Agte and Alterthum [86] ( 60 ○ C higher than TaC), in 1967 Rudy et al [79] gave it to TaC (3983 ○ C). Both teams were using Pirany furnace.…”

Section: ÷ ÷ -mentioning

confidence: 99%

Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

et al. 2019

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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. In the last few decades, remarkable research efforts and progress were done concerning the physical properties of UHTCs as well as their processing. Moreover, there are vivid research activities related to developing synthetic access pathways to UHTCs and related materials with high purity, tunable composition, nano‐scaled morphology, or improved sinterability. Among them, synthesis methods considering preceramic polymers as suitable precursors to UHTCs have received increased attention in the last few years. As these synthesis techniques allow the processing of UHTCs from the liquid phase, they are highly interesting, e.g., for the fabrication of ultra‐high temperature ceramic composites (UHT CMCs), additive manufacturing of UHTCs, etc. In the present review, UHTCs are in particular discussed within the context of their physical properties as well as energetics. Moreover, various synthesis methods using preceramic polymers to access UHTCs and related materials (i.e., (nano)composites thereof with silica former phases) are summarized and critically evaluated.

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Section: ÷ ÷ -mentioning

confidence: 99%

Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

et al. 2019

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“…The binary systems of zirconium and hafnium with nitrogen and carbon were studied experimentally from circa 1000 °C to liquidus temperatures and most of the systematic studies of phase equilibria were performed before 1970. New experimental results on melting temperature determination and thermodynamic properties of single phases were published since then [61,62,63,64,65,66], and an entirely new stream of thermodynamic data has emerged from ab initio computations [1,67,68,69].…”

Section: Phase Diagramsmentioning

confidence: 99%

“…Due to the microseconds timeframe of discharge, the heat losses can be neglected, and the total energy is known from the capacitor calibration. Recently, this approach was successfully applied for carbides and nitrides films 100 µm or thinner [61,63,64,65,66,161,162] and the first experimental data on fusion enthalpies and high temperature heat capacities of ZrC and ZrN were reported. The fusion enthalpy of ZrN was measured as 104 kJ/mol [65], and the fusion enthalpy of ZrC x was found to increase from 92 kJ/mol for ZrC to 111 kJ/mol for ZrC 0.95 .…”

Section: Rocksalt (Oxy)carbonitridesmentioning

confidence: 99%

Carbides and Nitrides of Zirconium and Hafnium

et al. 2019

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Among transition metal carbides and nitrides, zirconium, and hafnium compounds are the most stable and have the highest melting temperatures. Here we review published data on phases and phase equilibria in Hf-Zr-C-N-O system, from experiment and ab initio computations with focus on rocksalt Zr and Hf carbides and nitrides, their solid solutions and oxygen solubility limits. The systematic experimental studies on phase equilibria and thermodynamics were performed mainly 40–60 years ago, mostly for binary systems of Zr and Hf with C and N. Since then, synthesis of several oxynitrides was reported in the fluorite-derivative type of structures, of orthorhombic and cubic higher nitrides Zr3N4 and Hf3N4. An ever-increasing stream of data is provided by ab initio computations, and one of the testable predictions is that the rocksalt HfC0.75N0.22 phase would have the highest known melting temperature. Experimental data on melting temperatures of hafnium carbonitrides are absent, but minimum in heat capacity and maximum in hardness were reported for Hf(C,N) solid solutions. New methods, such as electrical pulse heating and laser melting, can fill the gaps in experimental data and validate ab initio predictions.

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