Instability of sintering of porous bodies

Olevsky, Eugene A.; Molinari, A.

doi:10.1016/s0749-6419(99)00032-7

Cited by 53 publications

(46 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sample heating can be achieved through direct conduction, micro-waves or light-laser irradiation 29,[56][57][58][59] . The properties of the porous metal materials' compressibility and the required morphology of the final product will determine the most appropriate heating technique 30 . The size and reactivity of the particles to be sintered have to be well understood in order to avoid densification by over-heating and fusion 28 .…”

Section: Thermo-mechanical Sinteringmentioning

confidence: 99%

“…The morphology and inter-connectivity of cells across structures made of non-connected voids (as in foams) or semi-continuous and tortuous networks (as in sponges) allows for a very fine tuning of bulk material properties. Other porous metal structures, including cast 26 or electroplated metal grids or sintered particles, nanoparticles (NPs) or fibre meshes, have also been fabricated and commercialized and offer cheap and highly versatile pore structures that can be altered by changing the substrate geometry or the dimensions (size, length or aspect ratio), respectively [27][28][29][30] . The processing of either pure or alloyed porous metal structures has been demonstrated from noble metals, such as gold, palladium or platinum, as well as for copper, aluminium, nickel or iron, thereby offering a wide range of chemistries relevant to specific applications 31 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The fabrication and surface functionalization of porous metal frameworks – a review

Dumée

Bao

et al. 2013

J. Mater. Chem. A

View full text Add to dashboard Cite

Porous metal frameworks offer potentially useful applications for the aerospace, automotive and bio-medical industries. They can be used as electrodes, actuators, or as selective membrane films. The versatility of the physical features (pore size, pore depth, overall porosity and pore surface coverage) as well as the large range of surface chemistries for both metal oxides and pure noble metals offers scope to functionalise metal nano-particles and networks of nano-porous metal structures. As well as traditional routes to producing metal structures, such as metal sintering or foaming, novel high-throughput techniques have recently been investigated. Nanoparticle self-assembly, metal ion reduction and deposition as well as metal alloy de-alloying were identified as sustainable routes to produce large surface areas of such nano-porous metal frameworks. The main limitations of the current fabrication techniques include the difficulty to process stable and homogeneous arrays of nano-scale pores and the control of their morphology due to the high reactivity of nano-structured metal structures. This paper aims at critically reviewing the various fabrication techniques and surface functionalization routes used to produce advanced functional porous metal frameworks. The limitations and advantages of the different fabrication techniques will be discussed in light of the final material properties and targeted applications. Keywordsporous metal frameworks; porous metal fabrication routes; metal surface chemistry; application of metal frameworks; 3

show abstract

Section: Thermo-mechanical Sinteringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The fabrication and surface functionalization of porous metal frameworks – a review

Dumée

Bao

et al. 2013

J. Mater. Chem. A

View full text Add to dashboard Cite

show abstract

“…Here, we use Olevsky's model [3], which corresponds to the second approach and is based on the plasticity and the viscous theory of linear deformation of porous bodies [2,4,5]. In this work, the relative density rel  , the sintering rate *   , and the volumetric shrinkage  are used as control parameters [6].…”

Section: Characterization Of the Sintering Processmentioning

confidence: 99%

Sintering Kinetics of Soft-Doped PZT (54/46) Systems

Durruthy-Rodríguez¹,

Calderón-Piñar²,

Malfatti³

et al. 2011

JMP

View full text Add to dashboard Cite

The influence of dopant concentration on PZT (54/46) systems doped with lanthanum and/or niobium is studied. The sintering kinetics is presented for 1 wt% of the dopant used to find the main mechanism which drives this process. The results were compared with a phenomenological model for viscous sintering and solid state sintering. The exponent obtained for viscous sintering in PZTN, PLZT and PLZTN were 0.05, 0.01, and 0.23 respectively, which indicate that the process is reactive liquid in all cases. In the other hand, the exponent obtained for solid state sintering were 6.61, 5.68, and 1.23 respectively, and prevalence Ostwald ripening and coalescence process together. Both dopants inhibit the grain growth and accelerate the sintering process, which increases with dopant concentration and the combination of both dopants. Shorohod-Olevsky model was applied for explain grain growth evolution, but does not coincide strictly with the applied model, which suggests that the process is very complex.

show abstract

“…During densification of the porous material, while it still is in a ductile state, the stress given by the curves corresponds to the flow stress of the material. The temperature effect was incorporated into the axial flow stress versus density curves based on four theoretical models for the rigidplastic [31][32][33][34] and power-law creep [30,33,34,37] densification behavior of porous materials (powder compacts).…”

Section: Consolidation Beha6ior Of Shs/sc Tibmentioning

confidence: 99%

“…Model of rigid-plastic constituti6e beha6ior for densification of porous materials. The general expression of the yield criterion for ductile porous materials in an isothermal experiment is given by [32]:…”

Section: Constituti6e Modelsmentioning

confidence: 99%

Combustion synthesis/densification of an Al2O3–TiB2 composite

Meyers

Olevsky

et al. 2001

Materials Science and Engineering: A

View full text Add to dashboard Cite

The self-propagating gasless combustion reaction 3TiO 2 + 3B 2 O 3 + 10Al 5Al 2 O 2 + 3TiB 2 was used to produce an Al 2 O 3 -TiB 2 composite, which was densified by uniaxial loading immediately following completion of reaction. The densification was enabled by the high temperatures produced by the combustion reaction ( :2000°C) which rendered the reaction product ( : 70% porosity) plastic. The microstructure was characterized by columnar TiB 2 grains with a diameter of 1 -2 mm and length of 5-10 mm embedded in equiaxed A1 2 O 3 (grain size :50mm); the TiB 2 phase tended to agglomerate in clusters. A few of the TiB 2 grains exhibited dislocations, while the A1 2 O 3 was annealed. This indicates that recovery processes took place after the plastic deformation involved in densification. Several constitutive models (corresponding both to rigid-plastic and power-law creep material behavior) were used to describe the mechanical response of the porous and ductile ceramic product and compared to the experimental results, with satisfactory agreement for power-law creep models. These constitutive models have a temperature-dependent term that incorporates the effect of specimen cooling, that occurs concurrently with densification; thus, it was possible to obtain a flow stress dependence of temperature which is in reasonable agreement with values interpolated from literature experimental results.

show abstract

Instability of sintering of porous bodies

Cited by 53 publications

References 62 publications

The fabrication and surface functionalization of porous metal frameworks – a review

The fabrication and surface functionalization of porous metal frameworks – a review

Sintering Kinetics of Soft-Doped PZT (54/46) Systems

Combustion synthesis/densification of an Al2O3–TiB2 composite

Contact Info

Product

Resources

About