Thermodynamic analysis of the reaction of titanium with boron carbide in a self-propagating high-temperature synthesis regime

Gordienko, S. P.

doi:10.1007/bf02676045

Cited by 8 publications

(6 citation statements)

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“…After heat treatment of this powder mixture, TiB 2 and FeB phase were observed on XRD pattern and TiC peaks were not seen. Gordienko [29] studied the thermodynamic analysis of Ti-B 4 C reaction with different molar ratios and reported that when the percentage of B 4 C was more that 37 wt.% TiC was not formed.…”

Section: Ma Of 3ti-3b 4 C Systemmentioning

confidence: 98%

Formation mechanism of B4C–TiB2–TiC ceramic composite produced by mechanical alloying of Ti–B4C powders

Rafiei

Salehi

Shamanian

2014

Advanced Powder Technology

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Section: Ma Of 3ti-3b 4 C Systemmentioning

confidence: 98%

Formation mechanism of B4C–TiB2–TiC ceramic composite produced by mechanical alloying of Ti–B4C powders

Rafiei

Salehi

Shamanian

2014

Advanced Powder Technology

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“…Disproportionation reaction (14) demonstrates that hafnium carbide can be formed with the degree of transformation close to unity. The boron monochloride participating in the diffusion saturation process enters into reactions (8), (13), and (15) with tungsten to form the corresponding borides W 2 B and WB.…”

Section: Results Of the Investigationmentioning

confidence: 97%

“…By using the thermodynamic model of the adiabatic process and the calculation procedures described in [14,19], we obtained the adiabatic combustion temperatures T a for the following reactions: 6500 K for reaction (1), 5100 K for reaction (7), 7700 K for reaction (9), Thermodynamic characteristics of the reactions as a function of the temperature and the pressure in the reaction zone SiCl(g) + 3/8Hf(s) 3/8HfSi 2 (s) + 1/4SiCl 4 (g) (10), 7400 K for reaction (13), and 4100 K for reaction (16).…”

Section: Results Of the Investigationmentioning

confidence: 99%

“…The self-propagating high-temperature synthesis as a method used for preparing new materials in the form of chemical compounds and coatings has been well described in the literature (see, for example, [12][13][14]), but its heterogeneous features have not been adequately investigated. It is assumed that specific components participating in exothermic chemical reactions during the formation of the protective coating, in particular, carbon and tungsten, are in the solid state, whereas the other components are in the liquid or vapor states.…”

Section: Introductionmentioning

confidence: 99%

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Complex temperature-resistant protective coatings for carbon-carbon materials

et al. 2009

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“…The SHS process was realized with the use of thermit mixtures being the components of high-temperature protective coatings W-(Si, B, C) and Hf-(Si, B, C), formed on the substrate of carbon-based material, mainly, by the gaseous-phase condensation. The self-propagating high-temperature synthesis, as a method for production of new materials in the form of chemical compounds and coatings, is well-described in the literature, in particular, in [22]- [24]. However, the heterogeneous features of the SHS process, when the reactive components are in different aggregate states and isothermal reactions take place in the near-surface layer, currently are not studied.…”

Section: Formation Of Heat-resistant Coatings By the Vacuum Activatedmentioning

confidence: 99%

Complex Protective Coatings for Graphite and Carbon-Carbon Composite Materials

Zmij¹,

Rudenkyi²,

Shepelev³

2015

MSA

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The objective of this review is to present the results on the production techniques, process parameters and compositions of heat-resistant coatings for graphite and carbon-carbon composites. The data reported concern the resistance of such protective coatings in air at temperatures up to 2273 K and in the high-speed flows of oxidizing gas media taking place in the spacecraft equipment. Coatings of this type, generally, have a multilayer structure based on the refractory compounds such as carbides, borides, silicides of transition metals and oxides with a high melting temperature. An efficient heat-resistant coating for carbon-based materials should be composed of three layers from which each fulfills its own function. The paper presents a new complex method for formation of heat-resistant coatings on the carbon-based materials. The method combines the vacuum-activated diffusion saturation in the presence of a liquid-phase and self-propagating high-temperature synthesis (SHS) simultaneously. * Corresponding author. V. I. Zmij et al. 880 ical impacts, ablation and electroerosion.However, under conditions of high temperatures, even above 773 K, C/C composites reveal comparatively low oxidation resistance, which restricts to a great extent their wide application in different fields, particularly, in the high-temperature equipment.At present, the problems of effective protection for carbon-based materials, being under conditions of different oxidizing media, are comprehensively discussed in the literature. A current state of this problem is under consideration in the review article [1]. The effective protection of C/C composites against oxidation can be provided with taking into account the following: use of such materials as oxides, carbides, nitrides, borides, silicides and their various compounds; deposition methods and conditions; thickness and crack resistance of coatings; material designing limiting because of the chemical activity of material reinforcement components; new approaches to the choice of a heat-resistant coating material. Main requirements to the carbon composites are: atmospheric oxidation resistance, thermal impact resistance, humidity resistance, and high mechanical strength. The methods of carbon-based material stabilization are based on different approaches: multilayer coating deposition, formation of glass-forming or metallic coatings subjected to chemical transformations by thermal treatment, and glass-forming compound impregnation. In the above-mentioned review, one offers to use for carbon-based material protection the refraction metals such as W

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Thermodynamic analysis of the reaction of titanium with boron carbide in a self-propagating high-temperature synthesis regime

Cited by 8 publications

References 1 publication

Formation mechanism of B4C–TiB2–TiC ceramic composite produced by mechanical alloying of Ti–B4C powders

Formation mechanism of B4C–TiB2–TiC ceramic composite produced by mechanical alloying of Ti–B4C powders

Complex temperature-resistant protective coatings for carbon-carbon materials

Complex Protective Coatings for Graphite and Carbon-Carbon Composite Materials

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