Densification and Microstructural Evolution of Hierarchically Porous Ceramics During Sintering

2015 ◽  
Vol 98 (11) ◽  
pp. 3424-3430 ◽  
Author(s):  
Haixia Shang ◽  
Aravind Mohanram ◽  
Rajendra K. Bordia
Keyword(s):  
Microstructural Evolution ◽  
Porous Ceramics ◽  
Hierarchically Porous

Microstructural evolution in porous ceramics subjected to freezing-thawing cycles: Modelling experimental outcomes

2018 ◽  
Vol 44 (14) ◽  
pp. 16992-16998 ◽  
Author(s):  
Giorgio Pia ◽  
Magdalena Lassinantti Gualtieri ◽  
Ludovica Casnedi ◽  
Paola Meloni ◽  
Francesco Delogu ◽  
...  
Keyword(s):  
Microstructural Evolution ◽  
Porous Ceramics

scholarly journals Strength of hierarchically porous ceramics: Discrete simulations on X-ray nanotomography images

2016 ◽  
Vol 113 ◽  
pp. 250-253 ◽  
Author(s):  
Denis Roussel ◽  
Aaron Lichtner ◽  
David Jauffrès ◽  
Julie Villanova ◽  
Rajendra K. Bordia ◽  
...  
Keyword(s):  
Porous Ceramics ◽  
Hierarchically Porous ◽  
X Ray

Hierarchically Porous Ceramics via Direct Writing of Binary Colloidal Gel Foams

2021 ◽  
Vol 13 (7) ◽  
pp. 8976-8984
Author(s):  
Benito Román-Manso ◽  
Joseph Muth ◽  
Lorna J. Gibson ◽  
Wolfgang Ruettinger ◽  
Jennifer A. Lewis
Keyword(s):  
Porous Ceramics ◽  
Direct Writing ◽  
Hierarchically Porous ◽  
Colloidal Gel

Hierarchically Porous Ceramics from Diatomite Powders by Pulsed Current Processing

2009 ◽  
Vol 92 (2) ◽  
pp. 338-343 ◽  
Author(s):  
Farid Akhtar ◽  
Petr O. Vasiliev ◽  
Lennart Bergström
Keyword(s):  
Porous Ceramics ◽  
Pulsed Current ◽  
Hierarchically Porous

Microstructure and mechanical and thermal shock properties of hierarchically porous ceramics

2021 ◽  
Author(s):  
Bo Li ◽  
Yongda Yan ◽  
Xinxin Jin ◽  
Yanquan Geng ◽  
Shuai Wang ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Porous Ceramics ◽  
Hierarchically Porous

Effect of Macropore Anisotropy on the Mechanical Response of Hierarchically Porous Ceramics

2015 ◽  
Vol 99 (3) ◽  
pp. 979-987 ◽  
Author(s):  
Aaron Lichtner ◽  
Denis Roussel ◽  
David Jauffrès ◽  
Christophe L. Martin ◽  
Rajendra K. Bordia
Keyword(s):  
Mechanical Response ◽  
Porous Ceramics ◽  
Hierarchically Porous

Microstructural Evolution in Reduced TiO2

1981 ◽  
Vol 39 ◽  
pp. 74-75
Author(s):  
W. T. Donlon ◽  
S. Shinozaki ◽  
E. M. Logothetis ◽  
W. Kaizer
Keyword(s):  
Microstructural Evolution ◽  
Point Defects ◽  
Extended Defects ◽  
Small Deviations ◽  
Controlled Atmospheres ◽  
Limited Solubility ◽  
Thin Foils ◽  
Heat Treated ◽  
Porous Polycrystalline ◽  
Crystallographic Shear

Since point defects have a limited solubility in the rutile (TiO2) lattice, small deviations from stoichiometry are known to produce crystallographic shear (CS) planes which accomodate local variations in composition. The material used in this study was porous polycrystalline TiO2 (60% dense), in the form of 3mm. diameter disks, 1mm thick. Samples were mechanically polished, ion-milled by conventional techniques, and initially examined with the use of a Siemens EM102. The electron transparent thin foils were then heat-treated under controlled atmospheres of CO/CO2 and H2 and reexamined in the same manner.The “as-received” material contained mostly TiO2 grains (∼5μm diameter) which had no extended defects. Several grains however, aid exhibit a structure similar to micro-twinned grains observed in reduced rutile. Lattice fringe images (Fig. 1) of these grains reveal that the adjoining layers are not simply twin related variants of a single TinO2n-1 compound. Rather these layers (100 - 250 Å wide) are alternately comprised of stoichiometric TiO2 (rutile) and reduced TiO2 in the form of Ti8O15, with the Ti8O15 layers on either side of the TiO2 being twin related.

Microscopy of porous ceramics

1989 ◽  
Vol 47 ◽  
pp. 438-439
Author(s):  
H. M. Kerch ◽  
R. A. Gerhardt
Keyword(s):  
Porous Ceramics ◽  
Specimen Preparation ◽  
High Porosity ◽  
Ion Milling ◽  
Forming Process ◽  
Preparation Methods ◽  
Pore Texture ◽  
Proper Design ◽  
And Function ◽  
Function Information

Highly porous ceramics are employed in a variety of engineering applications due to their unique mechanical, optical, and electrical characteristics. In order to achieve proper design and function, information about the pore structure must be obtained. Parameters of importance include pore size, pore volume, and size distribution, as well as pore texture and geometry. A quantitative determination of these features for high porosity materials by a microscopic technique is usually not done because artifacts introduced by either the sample preparation method or the image forming process of the microscope make interpretation difficult.Scanning electron microscopy for both fractured and polished surfaces has been utilized extensively for examining pore structures. However, there is uncertainty in distinguishing between topography and pores for the fractured specimen and sample pullout obscures the true morphology for samples that are polished. In addition, very small pores (nm range) cannot be resolved in the S.E.M. On the other hand, T.E.M. has better resolution but the specimen preparation methods involved such as powder dispersion, ion milling, and chemical etching may incur problems ranging from preferential widening of pores to partial or complete destruction of the pore network.

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