Initial sintering stage pore growth mechanism applied to the manufacture of ceramic membrane supports

Falamaki, Cavus; Afarani, Mahdi Shafiee; Aghaie, Alireza

doi:10.1016/s0955-2219(03)00643-5

Cited by 80 publications

(63 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…But, strong dependence of % porosity has been observed on sintering temperature. Initial pore growth observed for all sintering times may be due to surface diffusion and particle size distribution effects mechanisms (Falamaki et al, 2004). For same sintering times with increasing sintering temperatures, sintering densification predominates over pore growth and pore size get decreased.…”

Section: Porosity Pore Diameter Permeability and Thermal Conductivitymentioning

confidence: 83%

DEVELOPMENT OF TUBULAR Ni WICK USED IN LHP FOR SPACE APPLICATIONS

Samanta¹,

Sharma²,

Das³

et al. 2012

Frontiers in Heat Pipes

View full text Add to dashboard Cite

Present research is focused on porous tubular wick development, which is considered as the heart of the Loop heat pipes (LHP) specifically used for space applications, such as satellites and space craft's. Basic purpose of a wick is to generate capillary pumping pressure required to transport a working fluid along a two-phase heat transfer loop. Wicking structures are generally made of wire meshes or sintered metal powders. Present work establishes Metal Injection Moulding (MIM) as a potential route for the manufacturing of tubular wicks in the near-net shape form, discarding any need of further machining for creating vapour removal channels/grooves on the outer surface. Nickel powder along with polypropylene (PP) powder and thermoplastic binder consisting of paraffin wax (PW) and low density polyethylene (LDPE) are used to produce feedstock for injection moulding. Green compact of tubular wicks prepared by injection moulding is then debound and sintered to get the final porous structure. Further characterization of the tubular wicks sintered at 900 0 C for 60 minutes reveals porosity level of 55 vol%, avg. capillary pore diameter of 2.6µm, permeability of 1.94×10 -12 m 2 and thermal conductivity of 9.37 W/mK. SEM observation of wick samples shows well connected micro porous network responsible for generation of capillary pumping pressure.

show abstract

Section: Porosity Pore Diameter Permeability and Thermal Conductivitymentioning

confidence: 83%

DEVELOPMENT OF TUBULAR Ni WICK USED IN LHP FOR SPACE APPLICATIONS

Samanta¹,

Sharma²,

Das³

et al. 2012

Frontiers in Heat Pipes

View full text Add to dashboard Cite

show abstract

“…3(a2) to 3(e2). Gas permeance is affected by several factors such as the pore size, porosity, and tortuosity [22]. Among those, the pore size and pore size distribution are the most dominant factors as will be shown later.…”

Section: Gas Permeation and Mechanical Propertymentioning

confidence: 92%

Fabrication and characterization of affordable hydrophobic ceramic hollow fibre membrane for contacting processes

et al. 2017

View full text Add to dashboard Cite

Affordable hydrophobic hollow fibre membranes were prepared using kaolin and alumina based ceramic powders via a combined phase inversion and sintering technique, followed by a grafting with fluoroalkylsilane (FAS). The crux of the matter in this paper is to study the changes in the properties of the hollow fibre membranes (gas permeation, mechanical strength, pore size, porosity, tortuosity, morphology, and contact angle) by the addition of alumina (Al 2 O 3 ) to the pure kaolin with mono or multiparticle sizes. By varying the overall loading and particle size of alumina addition, different morphologies of the membranes were obtained due to the differences in the path lengths during phase inversion process for each solvent and nonsolvent exchange. The successful grafting with FAS was evidenced by the increase in contact angle from nearly equal to zero degree before grafting to 140° after grafting. Kaolin-alumina-4, one of the hollow fibres fabricated in this work, achieved a mean pore size of 0.25 µm with the bending strength of 96.4 MPa and high nitrogen permeance of 2.3×10 5 mol·m 2 ·Pa 1 ·s 1 , which makes the hollow fibre most suitable for the membrane contactor application.

show abstract

“…Al aumentar la presión aplicada, se produce un aumento de la resistencia mecánica en crudo de los soportes, así como una reducción del tamaño de poro; no obstante, existe una presión máxima, más allá de la cual un incremento de la presión aplicada no produce cambios significativos [112,114]. En el prensado, las fuerzas de rozamiento internas son elevadas, ya que las partículas rozan unas con otras, por lo que la energía necesaria para conformar la pieza es mayor que en la extrusión [6].…”

Section: Prensado Uniaxial En Secounclassified

“…Los poros cilíndricos que forman un ángulo recto con la superficie de la membrana tienen una tortuosidad de uno, ya que la longitud media del poro es el espesor de la membrana. Habitualmente los poros tienen formas más tortuosas, estando los valores típicos de tortuosidad comprendidos entre 1,5 y 2,5 (Figura 15) [7,114,134]. No obstante, la tortuosidad puede alcanzar valores de hasta 6, tal y como Falamaki et al muestran en sus estudios [108,114].…”

Section: Ecunclassified

Membranas cerámicas de bajo coste para el tratamiento de aguas residuales

Ayza¹,

Magdalena²

View full text Add to dashboard Cite

Initial sintering stage pore growth mechanism applied to the manufacture of ceramic membrane supports

Cited by 80 publications

References 11 publications

DEVELOPMENT OF TUBULAR Ni WICK USED IN LHP FOR SPACE APPLICATIONS

DEVELOPMENT OF TUBULAR Ni WICK USED IN LHP FOR SPACE APPLICATIONS

Fabrication and characterization of affordable hydrophobic ceramic hollow fibre membrane for contacting processes

Membranas cerámicas de bajo coste para el tratamiento de aguas residuales

Contact Info

Product

Resources

About