Influence of the structural properties of porous powder materials on the uniformity of local permeability

P. A. Vityaz'; V. M. Kaptsevich; V. K. Sheleg; V. V. Savich; A. G. Kostornov; V. P. Georgiev

doi:10.1007/bf00796229

Influence of the structural properties of porous powder materials on the uniformity of local permeability

Soviet Powder Metallurgy and Metal Ceramics ◽

10.1007/bf00796229 ◽

1988 ◽

Vol 27 (9) ◽

pp. 715-716

Author(s):

P. A. Vityaz' ◽

V. M. Kaptsevich ◽

V. K. Sheleg ◽

V. V. Savich ◽

A. G. Kostornov ◽

...

Keyword(s):

Structural Properties ◽

Powder Materials ◽

Porous Powder ◽

Local Permeability

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A method of measurement of the local permeability of porous powder materials with the use of a hot-wire anemometer

Soviet Powder Metallurgy and Metal Ceramics ◽

10.1007/bf01156559 ◽

1987 ◽

Vol 26 (7) ◽

pp. 567-569 ◽

Cited By ~ 1

Author(s):

V. M. Kaptsevich ◽

V. K. Sheleg ◽

L. P. Pilinevich ◽

V. V. Savich ◽

A. N. Sorokina ◽

...

Keyword(s):

Powder Materials ◽

Porous Powder ◽

Hot Wire ◽

Local Permeability ◽

Method Of Measurement

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Electron microscopy study of shock synthesis of silicides

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100151647 ◽

1993 ◽

Vol 51 ◽

pp. 1162-1163

Author(s):

Kenneth S. Vecchio

Keyword(s):

Shock Wave ◽

Plastic Deformation ◽

Close Contact ◽

Microscopy Study ◽

High Energy ◽

Electron Microscopy Study ◽

Powder Materials ◽

Porous Powder ◽

Wave Effects ◽

Wave Passage

Shock-induced reactions (or shock synthesis) have been studied since the 1960’s but are still poorly understood, partly due to the fact that the reaction kinetics are very fast making experimental analysis of the reaction difficult. Shock synthesis is closely related to combustion synthesis, and occurs in the same systems that undergo exothermic gasless combustion reactions. The thermite reaction (Fe2O3 + 2Al -> 2Fe + Al2O3) is prototypical of this class of reactions. The effects of shock-wave passage through porous (powder) materials are complex, because intense and non-uniform plastic deformation is coupled with the shock-wave effects. Thus, the particle interiors experience primarily the effects of shock waves, while the surfaces undergo intense plastic deformation which can often result in interfacial melting. Shock synthesis of compounds from powders is triggered by the extraordinarily high energy deposition rate at the surfaces of the powders, forcing them in close contact, activating them by introducing defects, and heating them close to or even above their melting temperatures.

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