Ballast degradation: Effect of particle size and shape using Los Angeles Abrasion test and image analysis

2018 ◽  
Vol 169 ◽  
pp. 414-424 ◽  
Author(s):  
Yunlong Guo ◽  
Valeri Markine ◽  
Jianing Song ◽  
Guoqing Jing
Keyword(s):  
Particle Size ◽  
Image Analysis ◽  
Los Angeles ◽  
Abrasion Test ◽  
Size And Shape ◽  
Los Angeles Abrasion ◽  
Effect Of Particle Size ◽  
Particle Size And Shape ◽  
Degradation Effect

Effect of Particle Size and Shape on Flowability of FGH96 Superalloy Powder

2021 ◽  
Vol 1035 ◽  
pp. 143-151
Author(s):  
Li Chong Zhang ◽  
Wen Yong Xu ◽  
Zhou Li ◽  
Liang Zheng ◽  
Yu Feng Liu ◽  
...  
Keyword(s):  
Particle Size ◽  
Fractal Dimension ◽  
Aspect Ratio ◽  
Shape Factors ◽  
Size And Shape ◽  
Median Diameter ◽  
Powder Flowability ◽  
Effect Of Particle Size ◽  
Particle Size And Shape ◽  
Superalloy Powder

The effect of particle size and shape on flowability of FGH96 superalloy powder was investigated by field emission scanning electron microscopy (FE-SEM), laser particle size analyzer (LPSA) and X-ray photoelectron spectroscopy (XPS). The results showed that the powder flowability basically presented a decreasing trend as the median diameter decreased. The Hall velocity of the five median diameter powders (50=203.9 μm, 106.3 μm, 83.2 μm, 73.8 μm, 19.9 μm) was 27.18 s/50g, 23.25 s/50g, 23.86 s/50g, 23.42 s/50g and none, respectively. The surface oxides/ hydroxide/nitride of the five median diameter powders were mostly the same, mainly including Al2O3, Cr2O3, MoO3, Nb2O5, Ni (OH)2, TiO2 and TiN. The median diameter 50, shape factors (circularity, aspect ratio, roundness, solidity) and fractal dimension were selected to quantitatively characterize particle size and shape. For the same fluctuation value of powder flowability, the roundness and solidity showed lower sensitivity. Compared with the two shape factors, the sensitivity of circularity and aspect ratio was at an intermediate level, while the median diameter and fractal dimension displayed higher sensitivity. The median diameter and fractal dimension can be used to characterize the principal variation of flowability. The circularity and aspect ratio can be utilized to characterize the variation of flowability supplementally.

Effect of Particle Size and Shape on Paint Consistency

1941 ◽  
Vol 33 (9) ◽  
pp. 1157-1164
Author(s):  
E. J. Dunn ◽  
Martin Kushner ◽  
C. H. Baier
Keyword(s):  
Particle Size ◽  
Size And Shape ◽  
Effect Of Particle Size ◽  
Particle Size And Shape

Effect of Electron Microscope Magnification on the Determination of Particle Size and Shape by Image Analysis

2007 ◽  
Vol 121-123 ◽  
pp. 893-896
Author(s):  
Zheng Min Li
Keyword(s):  
Particle Size ◽  
Image Analysis ◽  
Standard Sample ◽  
Standard Specimen ◽  
Particle Diameter ◽  
Value Change ◽  
Size And Shape ◽  
Transmission Electron ◽  
Particle Size And Shape

To investigate the effect of magnification (M) on determination of particle size and shape by transmission electron microscopy (TEM) and image analysis. The calibration curve and its simulative equation of TEM magnification are obtained by measurement of a grating replica standard specimen at different magnifications. Based on the analysis of TEM images at a series of magnifications for a 350nm-sphere standard sample, It has been found that the two errors of its size measurement, caused by one pixel change of the pixel number per particle diameter (Np) and by one gray value change during thresholding, is smaller, and the shape of ‘circle’ particles are close to the standard one, while Np is larger than 35. It can be seen that the suitable TEM magnification is in inverse proportion to particle size and it can be calculated by given equation.

Dextran-induced modifications of calcium carbonate particles precipitated during carbonatation

2019 ◽  
pp. 382-391
Author(s):  
Karin Abraham ◽  
Liza Splett ◽  
Eckhard Flöter
Keyword(s):  
Particle Size ◽  
Image Analysis ◽  
Calcium Carbonate ◽  
Filter Cake ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Shape Parameters ◽  
Size And Shape ◽  
Static Image ◽  
Particle Size And Shape

The effects of high and low molecular mass dextran (T2000 and T40) on the size and shape of particles precipitated during carbonatation and their correlation with filtration performances were key to this study. Varying contents of T2000 and T40 dextran in sugar solutions corresponding to DS contents of thin juice were investigated. For particle size and shape analysis, static image analysis and laser particle size analysis were used. Both methods, static image analysis and laser diffraction, revealed that the presence of T2000 and T40 dextran leads to a higher amount of large-sized particles at the expense of small-sized particles, indicating pronounced agglomeration. The additional evaluation of shape parameters (circularity, roundness, solidity) obtained from static image analysis indicates that the agglomeration is oriented in the absence and in the presence of lower T40 dextran levels. Besides, non-oriented agglomeration, resulting in more round agglomerates with smoother surfaces, was found for samples loaded with T2000 dextran and high T40 dextran levels. Only the latter samples have shown to negatively affect the filtration performance. Thus, in the presence of T2000 dextran and high T40 dextran levels, the filtration was hampered. This appears to be mainly caused by a tighter packing of more round calcium carbonate agglomerates in the porous structure of the filter cake.

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