Metal Liquid in SHS Reaction for TiB&lt;sub&gt;2&lt;/sub&gt; Ceramics

Fu, Zheng; Wang, Hao; Wang, Wei Ming; Zheng, Qingyao; Yuan, Run

doi:10.4028/www.scientific.net/kem.217.41

Cited by 4 publications

(3 citation statements)

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“…Fe-based metal matrix composites reinforced with TiC particles have been regarded as suitable examples in this category of materials [8]. Most researchers have produced iron-matrix composites including TiC as a reinforcement using the powder metallurgy [9], conventional melting, and casting methods [10][11][12][13][14]. However, these techniques have their own limitations and sometimes require a vacuum atmosphere and a high-temperature furnace.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ZrC Nanoparticles in the ZrO2–Mg–C–Fe System Through Mechanically Activated Self-Propagating High-Temperature Synthesis

Hajalilou

Hashim

Kamari

et al. 2014

Acta Metall. Sin. (Engl. Lett.)

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ZrC nanoparticles in the matrix of Fe were produced by the mechanically activated self-propagating hightemperature method using ZrO 2 /C/Mg/Fe powder mixtures. The effects of milling time, Fe content, and combustion temperature as well as the formation route for synthesizing ZrC powder particles were studied. The samples were characterized by XRD, SEM, TEM, and DTA. The XRD results revealed that, after 18 h of mechanical activation, ZrO 2 / ZC/Mg/Fe reacted with the self-propagating combustion (SHS) mode at 870°C producing the ZrC-Fe nanocomposite. It was also found that both mechanical activation and Fe content played key roles in the ZrC synthesis temperature. With a Fe content of (5-40) wt%, the SHS reaction proceeded favorably and both the ZrC formation temperature and the adiabatic temperature (T ad ) decreased. The MgO content was removed from the final products using a leaching test process by dissolving in hydrochloric and acetic acids.

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Section: Introductionmentioning

confidence: 99%

Synthesis of ZrC Nanoparticles in the ZrO2–Mg–C–Fe System Through Mechanically Activated Self-Propagating High-Temperature Synthesis

Hajalilou

Hashim

Kamari

et al. 2014

Acta Metall. Sin. (Engl. Lett.)

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“…In the QIP technique, the particulate acts as a pressuretransmitting medium (PTM) and redistributes an initially applied axial load to create a stress profile similar to isostatic pressing [3][4][5][6][7]. The pressure distribution in the PTM has been discussed in a previous paper [8].…”

Section: Introductionmentioning

confidence: 99%

“…However, one may take advantage of the ductile behavior when reaction products are still hot and apply techniques such as hot u Fax: +31-15-2843997, E-mail: richard.bouma@tno.nl pressing, hot rolling, hot isostatic pressing, or shock waves to eliminate porosity. Combustion synthesis followed by quasiisostatic pressing (QIP) in a granulate medium is the technique for removal of porosity studied here.In the QIP technique, the particulate acts as a pressuretransmitting medium (PTM) and redistributes an initially applied axial load to create a stress profile similar to isostatic pressing [3][4][5][6][7]. The pressure distribution in the PTM has been discussed in a previous paper [8].…”

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confidence: 99%

Combustion synthesis of TiB2-based cermets: modeling and experimental results

Pacheco¹,

Bouma²,

Katgerman

2007

Appl. Phys. A

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TiB 2 -based cermets are prepared by combustion synthesis followed by a pressing stage in a granulate medium. Products obtained by combustion synthesis are characterized by a large remaining porosity (typically 50%). To produce dense cermets, a subsequent densification step is performed after the combustion process and when the reacted material is still hot. To design the process, numerical simulations are carried out and compared to experimental results. In addition, physical and electrical properties of the products related to electrical contact applications are evaluated. IntroductionSelf-propagating high-temperature synthesis (SHS), also known as combustion synthesis or solid-flame combustion, is considered a gasless combustion process. It is a cost-effective method for producing high-purity refractory compounds and advanced ceramics [1]. Here, the application to functionally graded cermets and electrical contact materials is shown.The basis of the reaction synthesis relies on the ability of gasless and highly exothermic reactions to be selfsustaining. Ignition can be achieved by a laser beam, ohmic heating, induction, or spark. However, a sufficient amount of energy needs to be deposited for the reaction to become selfpropagating. SHS has assumed significance for the production of intermetallics, ceramics, and cermets because it is a very rapid processing technique without the need for complex furnaces [2], and can increase the productivity in comparison with conventional techniques. One of the drawbacks of this technique is the high porosity of the final product (typically 50%), due to: (1) initial porosity in the reactant mixture, and (2) the higher density of the reaction products with respect to starting materials. A subsequent densification stage is needed, which is often hard to achieve in ceramic composite materials because they are highly deformation-resistant. However, one may take advantage of the ductile behavior when reaction products are still hot and apply techniques such as hot u Fax: +31-15-2843997, E-mail: richard.bouma@tno.nl pressing, hot rolling, hot isostatic pressing, or shock waves to eliminate porosity. Combustion synthesis followed by quasiisostatic pressing (QIP) in a granulate medium is the technique for removal of porosity studied here.In the QIP technique, the particulate acts as a pressuretransmitting medium (PTM) and redistributes an initially applied axial load to create a stress profile similar to isostatic pressing [3][4][5][6][7]. The pressure distribution in the PTM has been discussed in a previous paper [8]. In addition, the PTM thermally isolates the sample, thereby minimizing cracking due to rapid cooling and keeping the temperature of the specimen for a longer time above the ductile-to-brittle transition temperature of the ceramic phase. In this study, numerical simulations of the heat flow from the reacted material to its surroundings are presented and will be compared with experimental results in order to know whether a sufficient time-window exists for th...

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A highly stable TiB2-supported Pt catalyst for polymer electrolyte membrane fuel cells

Yin

Pan

et al. 2011

Journal of Power Sources

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Metal Liquid in SHS Reaction for TiB<sub>2</sub> Ceramics

Cited by 4 publications

References 0 publications

Synthesis of ZrC Nanoparticles in the ZrO2–Mg–C–Fe System Through Mechanically Activated Self-Propagating High-Temperature Synthesis

Synthesis of ZrC Nanoparticles in the ZrO2–Mg–C–Fe System Through Mechanically Activated Self-Propagating High-Temperature Synthesis

Combustion synthesis of TiB2-based cermets: modeling and experimental results

A highly stable TiB2-supported Pt catalyst for polymer electrolyte membrane fuel cells

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