Image analysis and mathematical morphology for civil engineering materials

Coster, Michel; Chermant, Jean‐Louis

doi:10.1016/s0958-9465(00)00058-5

Cited by 122 publications

(42 citation statements)

References 21 publications

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“…This technique allows determination of bulk properties and gathering of localized information at the micron scale, which is essential to understand the factors controlling pressureless infiltration. 31,34,35,[37][38][39][40][41][42][43] The measurement leaves the samples intact, and the infiltration experiments can be made on the same samples.…”

Section: B Preform Characterizationmentioning

confidence: 99%

“…Several data procedure techniques have already been developed. [34][35][36][37][38][39][40][41][42][43][44][45][46][47] In the present work, the raw transmission images were backprojected using the ConeRec program from Skyscan, 38 which is based on a modified Feldkamp algorithm 48 [ Fig. 3(a)].…”

Section: B Preform Characterizationmentioning

confidence: 99%

“…It is also a valuable method for the appraisal of the procedure used for the 3D reconstruction from 2D-images. 46,47 The Saltykov method has been mainly discussed by Underwood et al, 42,43 and is well suited to treating spherical particles. The Saltykov algorithm is based on the analysis of particle diameters in 2D sections, which are divided into m size intervals.…”

Section: B Preform Characterizationmentioning

confidence: 99%

“…42,43 For each powder mixture, 120 slices were investigated. The full range of diameters was divided into 8 intervals for the A100T40-i samples and 15 intervals for the A100T200-i samples.…”

Section: B Preform Characterizationmentioning

confidence: 99%

“…Quantitative CT data analysis can also be hampered by limitation in the computing power of PCs. [40][41][42][43][44][45][46] The main goal of this investigation was the complete characterization of the porous ceramic performs by CT and to validate the technique using the results from the classical methods as benchmark. The porosity, pore size and its distribution, and spatial distribution of titanium as an activator within the preforms were determined.…”

Section: Introductionmentioning

confidence: 99%

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X-ray computed micro tomography as complementary method for the characterization of activated porous ceramic preforms

et al. 2007

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X-ray computed micro tomography (CT) is an alternative technique to the classical methods such as mercury intrusion (MIP) and gas pycnometry (HP) to obtain the porosity, pore-size distribution, and density of porous materials. Besides the advantage of being a nondestructive method, it gives not only bulk properties, but also spatially resolved information. In the present work, uniaxially pressed porous alumina performs activated by titanium were analyzed with both the classical techniques and CT. The benefits and disadvantages of the applied measurement techniques were pointed out and discussed. With the generated data, development was proposed for an infiltration model under ideal conditions for the production of metal matrix composites (MMC) by pressureless melt infiltration of porous ceramic preforms. Therefore, the reliability of the results, received from different investigation techniques, was proved statistically and stereologically.

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Section: B Preform Characterizationmentioning

confidence: 99%

Section: B Preform Characterizationmentioning

confidence: 99%

Section: B Preform Characterizationmentioning

confidence: 99%

Section: B Preform Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

X-ray computed micro tomography as complementary method for the characterization of activated porous ceramic preforms

et al. 2007

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Multiscale Extraction of Morphological Features in Woven CMCs

Chapoullié

Germain

Costa

et al. 2013

Ceramic Engineering and Science Proceedings

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Electrical Discharges under High Voltage on Surface of Silica‐Nickel Ceramic Composites

Jankowiak

Blanchart²

2004

Adv Eng Mater

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Cermets have a variety of important technological applications. Two-phase cermets composed with two powders with different electrical conductivities can be used as resistors, sensors transducers or igniters. [1,2] Their global electrical conductivity depends on many parameters as the quantity of the most conductive phase and its statistical distribution into the low conductive material, to form a more or less ordered structure. Besides, particle shape, size and packing density also influence the global electrical properties. In general, the increase of the quantity of metallic particles into an insulating ceramic matrix phase results in the increase of the global electrical conductivity. For a narrow range of the metallic powder content, the electrical conductivity exhibits a percolative behaviour, which is characterized by an abrupt increase in conductivity ( Fig. 1). This percolation threshold is also characterized by the abrupt variation of many material properties as the thermal conductivity. Most of these properties are related to the material volume, but electrically conductive cermets also exhibit peculiar surface properties as an electronic field emission on surface from a large density of emission sites. A similar behaviour was observed with conductive film for electrode. [3] Basically, field emission sites are often micro-protrusions (Figs. 2a and 2b) where the electric field is enhanced by a factor b to a value (~10 9 ±10 10 Vm ±1 ), which is the threshold for this type of emission to occur. Then breakdown is generally attained under macroscopic electric field, which doesn't exceed 10 6 Vm ±1 that it is significantly lower than for a similar air gap.This electrical process last about 100 ls, with two main successive stages for firstly the surface ionisation and secondly the breakdown, when a plasma-like process is obtained. But surface events are related to volume characteristics since the global conductivities of cermet extends to about 10 order of magnitude, from 10 ±4 Scm ±1 to 10 4 Scm ±1 , as a function of the metallic phase proportion, type and connectivity.The purpose of this work is to prepare nickel-silica cermets using micro-sized Ni grains as conductive phase and silica glass as matrix phase. The Ni grain size was carefully selected in order to limit the matrix cracking near the surface due to the thermal expansion coefficients mismatches during the breakdown. For electric measurements, nickel-silica cermets were connected with metal electrodes as in Figure 3.Results: The variation of conductivity under a low electrical field (Fig. 1) below and above the threshold is similar to conductivity of various composites as nickel-zirconia cermet [4,5,6] or polymer matrix composites. [7] Fitting these data show the typical behaviour or our composite, in comparison to other composite types. A number of models [8] from the literature indicate that the current percolation in a two-phase composite depends on both the amount of conductive particles, their shape and their spatial distribution within the in...

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Image analysis and mathematical morphology for civil engineering materials

Cited by 122 publications

References 21 publications

X-ray computed micro tomography as complementary method for the characterization of activated porous ceramic preforms

X-ray computed micro tomography as complementary method for the characterization of activated porous ceramic preforms

Multiscale Extraction of Morphological Features in Woven CMCs

Electrical Discharges under High Voltage on Surface of Silica‐Nickel Ceramic Composites

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