61 research outputs found
Manufacturing of tubular dead-end membranes by continuous thermoplastic extrusion
Dense and gastight dead-end tubular Ba0.5Sr0.5Co0.8Fe0.2O3-Ξ΄ (BSCF) membranes were fabricated by thermoplastic extrusion. Optimal feedstocks for the extrusion of dead-end tubular structures were obtained for a feedstock consisting of 89.83 wt% BSCF powder, 5.63 wt% ethylene vinyl acetate (EVA), 3.56 wt% paraffin wax (PW), and 0.98 wt% stearic acid (SA). Thermogravimetric analysis (TGA) was used to determine the thermal characteristics of the feedstock and to characterize the amount of binder removed during the wicking step. Straight and round dead-end tubular membranes with wall thickness of 0.5Β mm could be achieved after sintering. The gastightness test showed that the membranes were leak-tight up to a pressure of 35Β bar
Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3β<em>Ξ΄</em></sub> (BSCF) feedstock development and optimization for thermoplastic forming of thin planar and tubular oxygen separation membranes
This paper presents the processing steps for producing thin planar and tubular oxygen separation membranes by thermoplastic forming of Ba0.5Sr0.5Co0.8Fe0.2O3βΞ΄ (BSCF) with polystyrene (PS) and stearic acid (SA) as binder. The influence of powder content on the shape stability of thin membranes (tubular and planar structures) during the thermoplastic processing route was investigated. The effect of powder content on mixing torque and the rheological behavior were investigated. The effect of the powder content could be analytically described using the model proposed by Frankel and Acrivos. The deformation of free standing green bodies was investigated using disks. The result showed that increasing the powder content is remarkably effective to minimize the deformation of the membrane during the thermal debinding step. By using a high powder content (60 vol. %) and a multicomponent binder system composed of PS, SA and paraffin wax (PW), it was possible to achieve disks and thin wall tubular structures without deformation after sintering. Using capillary rheometer an unexpected decrease in the total extrusion pressure was measured for the feedstock containing PW. The change in apparent activation energy between 800β1000Β Β°C was not related to the membrane properties
Zur StabilitΓ€t von Mischphasen mit Perowskit- und Spinellstruktur
ΠΠ·-Π·Π° ΠΏΠΎΠ·Π΄Π½Π΅Π³ΠΎ ΠΏΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΎΠ±ΡΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΡ ΠΡΠ°Π»ΠΈΠΈ ΠΏΠΈΡΡΠΌΠ΅Π½Π½ΠΎ-Π»ΠΈΡΠ΅ΡΠ°ΡΡΡΠ½ΡΠΌ ΠΈΡΠ°Π»ΡΡΠ½ΡΠΊΠΈΠΌ ΡΠ·ΡΠΊΠΎΠΌ, ΡΠ»ΠΎΠΆΠΈΠ²ΡΠΈΠΌΡΡ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Π»ΠΈΡΠ΅ΡΠ°ΡΡΡΠ½ΠΎΠΉ ΡΠΎΡΠΌΡ ΡΠ»ΠΎΡΠ΅Π½ΡΠΈΠΉΡΠΊΠΎΠ³ΠΎ Π½Π°ΡΠ΅ΡΠΈΡ ΡΠΎΡΠΊΠ°Π½ΡΠΊΠΎΠ³ΠΎ Π΄ΠΈΠ°Π»Π΅ΠΊΡΠ°, Π²ΠΏΠ»ΠΎΡΡ Π΄ΠΎ 50-Ρ
Π³Π³. XX Π². Π²Π»Π°Π΄Π΅Π»ΠΈ ΡΠΎΠ»ΡΠΊΠΎ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½Π½ΡΠ΅ ΡΠΎΡΠΊΠ°Π½ΡΡ ΠΈ ΡΠ·ΠΊΠ°Ρ ΠΏΡΠΎΡΠ»ΠΎΠΉΠΊΠ° ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½Π½ΡΡ
Π»ΡΠ΄Π΅ΠΉ Π² Π΄ΡΡΠ³ΠΈΡ
ΡΠ΅Π³ΠΈΠΎΠ½Π°Ρ
. ΠΠ΅Π³ΡΠ°ΠΌΠΎΡΠ½ΡΠ΅ Π»ΡΠ΄ΠΈ Π·Π½Π°Π»ΠΈ ΡΠΎΠ»ΡΠΊΠΎ ΡΠ²ΠΎΠΉ Π΄ΠΈΒΠ°Π»Π΅ΠΊΡ. Π Π°ΡΠΏΡΠΎΡΡΡΠ°Π½Π΅Π½ΠΈΠ΅ ΡΠ°Π΄ΠΈΠΎΠ²Π΅ΡΠ°Π½ΠΈΡ Π² ΠΡΠ°Π»ΠΈΠΈ Π² Π½Π°ΡΠ°Π»Π΅ 20-Ρ
Π³Π³. XXΠ². ΡΠΎΠ²ΠΏΠ°Π»ΠΎ Ρ ΠΏΠ΅ΡΠΈΠΎΠ΄ΠΎΠΌ ΡΠ°ΡΠΈΡΡΡΠΊΠΎΠΉ ΠΏΡΠΎΠΏΠ°Π³Π°Π½Π΄Ρ, Π½Π°ΡΠ΅Π»Π΅Π½Π½ΠΎΠΉ Π½Π° ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ Π΅Π΄ΠΈΠ½ΠΎΠ³ΠΎ ΠΈΡΠ°Π»ΡΡΠ½ΡΠΊΠΎΠ³ΠΎ ΡΠ·ΡΠΊΠ°, ΠΈΠ· ΠΊΠΎΒΡΠΎΡΠΎΠ³ΠΎ ΡΠ»Π΅Π΄ΠΎΠ²Π°Π»ΠΎ ΠΈΡΠΊΠ»ΡΡΠΈΡΡ Π΄ΠΈΠ°Π»Π΅ΠΊΡΠ½ΡΡ Π²Π°ΡΠΈΠ°ΡΠΈΠ²Π½ΠΎΡΡΡ ΠΈ ΠΈΠ½ΠΎΡΡΡΠ°Π½Π½ΡΠ΅ Π·Π°ΠΈΠΌΡΡΠ²ΠΎΠ²Π°Π½ΠΈΡ.
Π ΡΡΠ°ΡΡΠ΅ ΠΎΡΠ²Π΅ΡΠ°ΡΡΡΡ ΠΎΡΠ½ΠΎΠ²Π½ΡΠ΅ ΡΡΠ°ΠΏΡ ΡΠ·ΡΠΊΠΎΠ²ΠΎΠΉ ΠΏΠΎΠ»ΠΈΡΠΈΠΊΠΈ ΡΠ°ΡΠΈΡΡΡΠΊΠΎΠ³ΠΎ Π΄Π²Π°Π΄ΡΠ°ΡΠΈΠ»Π΅ΡΠΈΡ β Il Ventennio (1925-1945 Π³Π³.) β ΠΎΡ ΡΠΎΠ»Π΅ΡΠ°Π½ΡΠ½ΠΎΠ³ΠΎ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ ΠΊ ΡΠ·ΡΠΊΠΎΠ²ΡΠΌ ΡΠ°Π·Π»ΠΈΡΠΈΡΠΌ Π½Π° ΡΠ΅ΡΒΡΠΈΡΠΎΡΠΈΠΈ ΠΡΠ°Π»ΠΈΠΈ ΠΊ ΠΏΠΎΠ»Π½ΠΎΠΌΡ ΠΈΡ
Π½Π΅ΠΏΡΠΈΡΡΠΈΡ, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΊ ΡΠ΅Π³Π»Π°ΠΌΠ΅Π½ΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΌΡ ΠΈΡΠΊΠ»ΡΡΠ΅Π½ΠΈΡ ΠΈΠ½ΠΎΡΡΡΠ°Π½Π½ΡΡ
ΡΠ»ΠΎΠ² ΠΈΠ· ΠΈΡΠ°Π»ΡΡΠ½ΡΠΊΠΎΠ³ΠΎ ΡΠ·ΡΠΊΠ°. ΠΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ΅Π»ΠΈ β ΡΡΠ°Π±ΠΈΠ»ΠΈΠ·Π°ΡΠΈΡ Π²Π½ΡΡΡΠ΅Π½Π½ΠΈΡ
ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠΉ ΠΌΠ΅ΠΆΠ΄Ρ Π²Π΅Π΄ΡΡΠΈΠΌΠΈ ΠΏΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ Π³ΡΡΠΏΠΏΠ°ΠΌΠΈ ΠΈ Π½Π°ΡΠΎΠ΄Π½ΠΎΠΉ ΠΌΠ°ΡΡΠΎΠΉ, ΡΠΎΠ·Π΄Π°Π½ΠΈΠ΅ Π΅Π΄ΠΈΠ½ΠΎΠ³ΠΎ ΡΠΏΠ»ΠΎΡΡΠ½Π½ΠΎΠ³ΠΎ Π³ΠΎΡΡΠ΄Π°ΡΡΡΠ²Π°, Π½Π°ΡΡΡΠΎΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΡΠΈΠ² ΠΎΠ±ΡΠ΅Π³ΠΎ Π²ΡΠ°Π³Π° β ΡΠΏΠΎΡΠΎΠ±ΡΡΠ²ΠΎΠ²Π°Π»ΠΈ ΡΠΎΠ·Π΄Π°Π½ΠΈΡ ΠΈΡΠ°Π»ΡΡΠ½ΡΠΊΠΈΡ
ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΉ ΡΠ°Π΄ΠΈΠΎΠ²Π΅ΡΠ°Π½ΠΈΡ, Π΄ΠΈΠΊΡΠΎΠ²Π°Π²ΡΠΈΡ
Π½ΠΎΡΠΌΡ ΡΡΡΠ½ΠΎΠΉ ΡΠ΅ΡΠΈ, ΠΊΠΎΡΠΎΡΡΠ΅ Π±ΡΠ»ΠΈ Π·Π°ΠΊΡΠ΅ΠΏΠ»Π΅Π½Ρ Π² Π‘ΠΏΡΠ°Π²ΠΎΡΠ½ΠΈΠΊΠ΅ ΠΏΠΎ ΠΏΡΠΎΠΈΠ·Π½ΠΎΡΠ΅Π½ΠΈΡ ΠΈ ΠΎΡΡΠΎΠ³ΡΠ°ΡΠΈΠΈ, ΠΈΠ·Π΄Π°Π½Π½ΠΎΠΌ Π² 1939 Π³.. ΠΠ½ΡΠ΅ΡΠ΅ΡΠ½ΡΒΠΌΠΈ ΠΎΠΊΠ°Π·ΡΠ²Π°ΡΡΡΡ ΠΏΡΠΈΡΠΈΠ½Ρ ΡΠΎΠ»Π΅ΡΠ°Π½ΡΠ½ΠΎΠ³ΠΎ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ ΠΊ Π΄ΠΈΠ°Π»Π΅ΠΊΡΠ°ΠΌ, ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ Π·Π°ΠΊΡΠ΅ΠΏΠ»Π΅Π½ΠΈΡ Π·Π°ΠΈΠΌΡΡΠ²ΠΎΠ²Π°Π½ΠΈΠΉ Π² ΡΠ·ΡΠΊΠ΅ ΠΈ ΡΠ²ΡΠ·Π°Π½Π½ΡΠ΅ Ρ ΡΡΠΈΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°ΡΠ΅Π»ΡΠ½ΡΠ΅ ΡΠ°Π΄ΠΈΠΎΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΡ ΠΏΠ΅ΡΠΈΠΎΠ΄Π° ΡΠ°ΒΡΠΈΠ·ΠΌΠ°
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