Experimental investigation of processes of plastic deformation of porous materials

1984 ◽  
Vol 23 (1) ◽  
pp. 10-13
Author(s):  
G. L. Petrosyan ◽  
Kh. L. Petrosyan ◽  
S. G. Agbalyan ◽  
A. V. Gevorkyan
Keyword(s):  
Experimental Investigation ◽  
Plastic Deformation ◽  
Porous Materials

EXPERIMENTAL INVESTIGATION OF CHALCOCITE: ANNEALING AND PLASTIC DEFORMATION AT ELEVATED TEMPERATURES

1965 ◽  
Vol 2 (2) ◽  
pp. 98-117
Author(s):  
Raymond Davies
Keyword(s):  
Experimental Investigation ◽  
Plastic Deformation ◽  
Solid State ◽  
Grain Growth ◽  
Annealing Time ◽  
Silica Glass ◽  
Elevated Temperatures ◽  
Recrystallization Behavior ◽  
Vapor Pressures ◽  
Sulfur Vapor

The recrystallization behavior and deformation of synthetic chalcocite (Cu2S) in the temperature range 400–725 °C was studied microscopically after the compound was annealed in evacuated silica glass capsules and heated under differential pressures in sealed gold capsules. The temperature of recrystallization and grain growth ascribed to the hexagonal cubic inversion, at sulfur vapor pressures much less than 1 atmosphere, was determined at 465 ± 5 °C, with annealing time of [Formula: see text].Experiments involving differential pressures of 8 000 p.s.i. show that chalcocite in the solid state becomes considerably more mobile above 563 ± 10 °C and can readily be injected as a plastic mass to form veins without preservation of deformational textures.Natural bornite and natural galena may also be injected under differential pressure at 640 °C, but some unhealed fractures remain. Flow structure is well-preserved in galena and, under certain conditions, in bornite.Mixtures of bornite and pyrite flowed and recrystallized to chalcopyrite and bornite with exsolved chalcopyrite. No evidence of flowage remained.Chalcopyrite and pyrrhotite are resistant to injection under similar differential pressures and temperatures.

Determination of the density of solids by means of a solid pycnometric substance

1989 ◽  
Vol 54 (2) ◽  
pp. 303-307 ◽  
Author(s):  
Jiří Medek ◽  
Zuzana Weishauptová
Keyword(s):  
Plastic Deformation ◽  
Porous Materials ◽  
Apparent Density ◽  
New Method ◽  
Solid Substance ◽  
True Density ◽  
Rheologic Properties

A new method has been developed for determination of apparent density of porous powdered materials, which uses a suitable plastic solid substance as the pycnometric medium. In this method a mixture of the tested and pycnometric substances is compressed in a pressing device up to the pressure, at which the pycnometric substance undergoes plastic deformation and fills completely all intergranular voids between particles of the tested material. The rheologic properties of the pycnometric substance prevent its penetration into coarse pores, which makes the method especially suitable for determination of apparent density of coarsely porous materials. The method can be used also for determination of true density of non-porous powdered materials.

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