Simultaneous synthesis of molybdenum carbides and titanium carbides by sol–gel method

Biedunkiewicz, A.; Figiel, P.; Krawczyk, M.; Gabriel-Półrolniczak, U.

doi:10.1007/s10973-013-3176-2

Cited by 11 publications

(2 citation statements)

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“…In theory of kinetics of non-catalytic heterogeneous reactions, it is assumed that the reaction rate depends on temperature and conversion degree [1][2][3][4][5] …”

Section: Introductionmentioning

confidence: 99%

Analysis of (NH4)6Mo7O24·4H2O thermal decomposition in argon

Biedunkiewicz

Krawczyk

Gabriel-Półrolniczak

et al. 2013

J Therm Anal Calorim

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Nanometric carbides of transition metals and silicon are obtained by using precursors. Control of the course of these processes require data concerning transformations of single precursor, transformations of precursor in the presence of reducing agent and synthesis of the carbide. In this work, the way of investigating such processes is described on the example of thermal decomposition of (NH 4 ) 6 Mo 7 O 24 Á4H 2 O (precursor) in argon. The measurements were carried out by TG-DSC method. The solid products were identified by XRD method, and the gaseous products were determined by mass spectrometry method. There was demonstrated that the investigated process proceeded in five stages. Kinetic models (forms of f(a) and g(a) function) most consistent with experimental data and coefficients of Arrhenius equation A and E were determined for the stages. The Kissinger method and the Coats-Redfern equation were applied. In case of the Coats-Redfern equation, the calculations were performed by analogue method. In this way good consistency between the calculated and determined conversion degrees a(T) at practically constant values of A and E were obtained for distinguished stages and different sample heating rates.Keywords Decomposition of (NH 4 ) 6 Mo 7 O 24 Á4H 2 O in argon Á Thermal analysis Á Process kinetics Á Kissinger method Á Coats-Redfern equation Abbreviations APre-exponential Arrhenius factor/1 minConversion function dependent on mechanism of reaction f 0 (a m ) Derivative of f(a) function for maximal reaction rate u(T, a, P) Temperature, conversion degree and pressure function g(a)Integral form of kinetic model h(P)Pressure function k(T)Reaction rate constant/1 min

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“…In theory of kinetics of non-catalytic heterogeneous reactions, it is assumed that the reaction rate depends on temperature and conversion degree [1][2][3][4][5] …”

Section: Introductionmentioning

confidence: 99%

Analysis of (NH4)6Mo7O24·4H2O thermal decomposition in argon

Biedunkiewicz

Krawczyk

Gabriel-Półrolniczak

et al. 2013

J Therm Anal Calorim

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“…Because (i) its mechanical properties are similar to those of tungsten carbide (WC) that uses expensive cobalt as the sintering aid and (ii) it is sintered with a cheaper sintering aid (nickel), TiC is also considered as a partial substitute for WC. TiC has been synthesized via various processing routes including combustion reactions [1][2][3][4][5], sol-gel and solution processes [6][7][8][9][10][11], gas phase or thermal plasma reactions [12][13][14][15][16][17][18], mechanothermal reactions [19,20], and Mg-thermal reductions [21][22][23], while commercial production primarily uses a carbothermal reduction process due to its low cost. The chemical reaction in the carbothermal reduction process is as follows:…”

Section: Introductionmentioning

confidence: 99%

Titanium Carbide Nanocrystals Synthesized from a Metatitanic Acid‐Sucrose Precursor via a Carbothermal Reduction

Shin

Eun

2015

Journal of Nanomaterials

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A TiC powder is synthesized from a micron-sized mesoporous metatitanic acid-sucrose precursor (precursor M) by a carbothermal reduction process. Control specimens are also prepared using a nanosized TiO2-sucrose precursor (precursor T) with a higher cost. When synthesized at 1500°C for 2 h in flowing Ar, the characteristics of the synthesized TiC from precursor M are similar to those of the counterpart from precursor T in terms of the crystal size (58.5 versus 57.4 nm), oxygen content (0.22 wt% versus 0.25 wt%), and representative sizes of mesopores: approximately 2.5 and 19.7–25.0 nm in both specimens. The most salient differences of the two specimens are found in the TiC from precursor M demonstrating (i) a higher crystallinity based on the distinctive doublet peaks in the high-two-theta XRD regime and (ii) a lower specific surface area (79.4 versus 94.8 m2/g) with a smaller specific pore volume (0.1 versus 0.2 cm3/g) than the counterpart from precursor T.

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Titanium Monocarbide

Shabalin¹

2020

Ultra-High Temperature Materials III

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Simultaneous synthesis of molybdenum carbides and titanium carbides by sol–gel method

Cited by 11 publications

References 6 publications

Analysis of (NH4)6Mo7O24·4H2O thermal decomposition in argon

Analysis of (NH4)6Mo7O24·4H2O thermal decomposition in argon

Titanium Carbide Nanocrystals Synthesized from a Metatitanic Acid‐Sucrose Precursor via a Carbothermal Reduction

Titanium Monocarbide

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