Shock-induced and self-propagating high-temperature synthesis reactions in two powder mixtures: 5:3 Atomic ratio Ti/Si and 1:1 Atomic ratio Ni/Si

Krueger, B. R.; Mutz, A. H.; Vreeland, T.

doi:10.1007/bf02660851

Cited by 46 publications

(24 citation statements)

References 7 publications

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“…Shock pressure and energy were determined from the measured flyer velocity and initial powder porosity, and the Hugoniot properties for an unreacted elemental mixture as in Ref. 4. The equilibrium temperature for unreacted powder was calculated using the specific heats of Ti and Si, assuming all of the shock energy is converted to heat.…”

Section: Resultsmentioning

confidence: 99%

“…The result of this target assembly is a well-controlled plane-wave geometry. 4 The powders were loaded into the cylindrical powder cavity of the target assembly, leveled, and pressed to the desired porosity. The pressed powder depth was nominally 16 mm for each experiment.…”

Section: Methodsmentioning

confidence: 99%

“…Krueger et al 4 found the conditions for shock initiation of the Ti 5 Si 3 reaction in 5Tiϩ3Si powders ͑Ϫ325 mesh͒ were sensitive to both the initial porosity and the residual O 2 gas in the pores. Powders evacuated, back filled with Ar and evacuated to 0.2 Torr, had a threshold energy approximately three times the energy for reaction of an evacuated powder with residual O 2 .…”

Section: Introductionmentioning

confidence: 99%

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Shock wave initiation of the Ti5Si3 reaction in elemental powders

Vreeland

Montilla

Mutz

1997

Journal of Applied Physics

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Elemental powder mixes were subjected to plane-wave shock processing which reduced the initial porosity to essentially zero. Two powder mixes in a 5:3 Ti:Si atomic ratio were used: Ϫ325 mesh Ti and Si ͑Ͻ45 m͒, and Ϫ100 mesh Ti and Si ͑Ͻ150 m͒ with shock pressures up to 7.3 GPa and shock energies up to 671 J/g. Shock pressures were calculated using hugoniot parameters for porous elemental powder mixtures and shock energies were taken to be the work done by the shock ( P⌬V/2). Shock energy thresholds for complete reaction of the elemental powders were found which depend upon powder particle size and the initial porosity of the powder. The threshold energy for the larger powder mix was found to be ϳ80% larger than that for the smaller powder. A decrease in initial porosity from 0.49 to 0.40 caused an increase in threshold shock energy of about 75% for both powders. At shock energies slightly below the threshold energy, evidence for the reaction of solid Ti and liquid Si was observed in small isolated regions. These regions contained spherical micronodules with the composition of TiSi 2 in Si. The results are compared to those of previous studies reported in the literature, and mechanisms for reaction initiation and the observed threshold values are proposed.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shock wave initiation of the Ti5Si3 reaction in elemental powders

Vreeland

Montilla

Mutz

1997

Journal of Applied Physics

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“…Conventionally, a solid bulk typed Ti 3 Al can be synthesized by reacting mixed stochiometric powders of Ti and Al at higher temperature or arc melting of Ti and Al pieces [8,9]. In spite of their research significance, in recent years there have been relatively few studies on the consolidation of Ti 3 Al in the form of powder.…”

Section: Introductionmentioning

confidence: 99%

Self-Consolidation and Surface Modification of Mechanical Alloyed Ti-25.0 at.% Al Powder Mixture by Using an Electro-Discharge Technique

Chang¹,

Jang²,

Yoon³

et al. 2017

Archives of Metallurgy and Materials

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Electrical discharges using a capacitance of 450 μF at 0.5, 1.0, and 1.5 kJ input energies were applied in a N 2 atmosphere to obtain the mechanical alloyed Ti 3 Al powder without applying any external pressure. A solid bulk of nanostructured Ti 3 Al was obtained as short as 160 μsec by the Electrical discharge. At the same time, the surface has been modified into the form of Ti and Al nitrides due to the diffusion process of nitrogen to the surface. The input energy was found to be the most important parameter to affect the formation of a solid core and surface chemistry of the compact.

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“…It has reported that a solid bulk typed Ti 5 Si 3 was made by reacting with the stoichiometric mixture of Ti and Si powders at higher temperature or arc melting of Ti and Si pieces [7,8]. In spite of their research significance, relatively few studies on the sintering of Ti and Si powders have been investigated in recent years.…”

Section: Introductionmentioning

confidence: 99%

Self-Consolidation Mechanism of Ti5Si3 Compact Obtained by Electro-Discharge-Sintering Directly from Physically Blended Ti-37.5 at.% Si Powder Mixture

Chang

Cheon

Yoon

et al. 2017

Archives of Metallurgy and Materials

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Characteristics of electro-discharge-sintering of the Ti-37.5at.% Si powder mixture was investigated as a function of the input energy, capacitance, and discharge time without applying any external pressure. A solid bulk of Ti 5 Si 3 was obtained only after in less than 129 μsec by the EDS process. During a discharge, the heat is generated to liquefy and alloy the particles, and which enhances the pinch pressure can condensate them without allowing a formation of pores. Three step processes for the self-consolidation mechanism during EDS are proposed; (a) a physical breakdown of oxide film on elemental as-received powder particles, (b) alloying and densifying the consolidation of powder particles by the pinch pressure, and (c) diffusion of impurities into the consolidated surface.

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Shock-induced and self-propagating high-temperature synthesis reactions in two powder mixtures: 5:3 Atomic ratio Ti/Si and 1:1 Atomic ratio Ni/Si

Cited by 46 publications

References 7 publications

Shock wave initiation of the Ti5Si3 reaction in elemental powders

Shock wave initiation of the Ti5Si3 reaction in elemental powders

Self-Consolidation and Surface Modification of Mechanical Alloyed Ti-25.0 at.% Al Powder Mixture by Using an Electro-Discharge Technique

Self-Consolidation Mechanism of Ti5Si3 Compact Obtained by Electro-Discharge-Sintering Directly from Physically Blended Ti-37.5 at.% Si Powder Mixture

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