Pore growth during the initial stages of sintering ceramics

Whittemore, O. J.; Sipe, John J.

doi:10.1016/0032-5910(74)80027-6

Cited by 67 publications

(30 citation statements)

References 2 publications

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“…5(a) that % porosity decreases with increasing temperature for all sintering times which is in agreement with usual cases reported in the literature (Tracey, 1981;Whittemore and Sipe, 1974). But, strong dependence of % porosity has been observed on sintering temperature.…”

Section: Porosity Pore Diameter Permeability and Thermal Conductivitysupporting

confidence: 81%

DEVELOPMENT OF TUBULAR Ni WICK USED IN LHP FOR SPACE APPLICATIONS

Samanta¹,

Sharma²,

Das³

et al. 2012

Frontiers in Heat Pipes

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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.

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Section: Porosity Pore Diameter Permeability and Thermal Conductivitysupporting

confidence: 81%

DEVELOPMENT OF TUBULAR Ni WICK USED IN LHP FOR SPACE APPLICATIONS

Samanta¹,

Sharma²,

Das³

et al. 2012

Frontiers in Heat Pipes

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show abstract

“…Another reason might be the tendency of small particles to be connected in order to form larger particles during the sintering (particle coalescence), resulting in a noticeable pore growth [36]. Beside particle coalescence, the wide particle size distribution effect could cause poregrowing behavior [37]. Accordingly, the smaller pores might be eliminated as a result of micrometric shrinkage of the sample during the sintering step [35,38].…”

Section: 2mentioning

confidence: 98%

Characteristics of Ni/YSZ ceramic anode prepared using carbon microspheres as a pore former

Horri

Selomulya

Wang

2012

International Journal of Hydrogen Energy

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“…[37][38][39][40][41][42] The explanations given by the researchers differ as sintering mechanism of real powders is too complicated to apply models directly to them. Several parameters such as sintering temperature, 30-32 particle size distribution, 34 particle agglomeration, 35 particle packing, 36 37 and diffusion (surface, grain boundary and volume) coefficients [30][31][32] involved have been found to affect the evolution of compact microstructure.…”

Section: Sinteringmentioning

confidence: 99%

Small-Angle Neutron Scattering Investigations on Sintering Behavior of Combustion Synthesized La_0.8Sr_0.2CrO₃

Patra¹,

Bahadur²,

Mazumder³

et al. 2008

j nanosci nanotechnol

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Pore morphology of La0.8Sr0.2CrO3 (LSC) powder compacts, sintered between 1200 degrees C and 1450 degrees C for a fixed time, has been characterized by small-angle neutron scattering (SANS) in the scattering wave vector 'q' range, 0.003-0.17 nm(-1) of a double crystal based instrument. Scattering profile of green compact exhibits fractal scaling at two regions of 'q' with magnitudes of fractal dimensionality 1.8 and 2.36. Scattering profiles of sintered pellets have been modeled assuming a random distribution of near spherical pores in the solid matrix. Estimated pore size distributions of sintered pellets indicate decrease in pore volume has taken place by progressive elimination of smallest pores and growth of relatively larger pores with increasing sintering temperature. SANS results are supplemented by light scattering measurement and TEM image of powder and SEM image of the fracture surface of sintered pellet.

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Pore growth during the initial stages of sintering ceramics

Cited by 67 publications

References 2 publications

DEVELOPMENT OF TUBULAR Ni WICK USED IN LHP FOR SPACE APPLICATIONS

DEVELOPMENT OF TUBULAR Ni WICK USED IN LHP FOR SPACE APPLICATIONS

Characteristics of Ni/YSZ ceramic anode prepared using carbon microspheres as a pore former

Small-Angle Neutron Scattering Investigations on Sintering Behavior of Combustion Synthesized La_0.8Sr_0.2CrO₃

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Pore growth during the initial stages of sintering ceramics

Cited by 67 publications

References 2 publications

DEVELOPMENT OF TUBULAR Ni WICK USED IN LHP FOR SPACE APPLICATIONS

DEVELOPMENT OF TUBULAR Ni WICK USED IN LHP FOR SPACE APPLICATIONS

Characteristics of Ni/YSZ ceramic anode prepared using carbon microspheres as a pore former

Small-Angle Neutron Scattering Investigations on Sintering Behavior of Combustion Synthesized La0.8Sr0.2CrO3

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Product

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Small-Angle Neutron Scattering Investigations on Sintering Behavior of Combustion Synthesized La_0.8Sr_0.2CrO₃