On the Topological Characterization of 3-D Polyhedral Microstrutures

2007 ◽  
Vol 537-538 ◽  
pp. 563-570 ◽  
Author(s):  
Tamás Réti ◽  
Agnes Csizmazia ◽  
Imre Felde
Keyword(s):  
Single Phase ◽  
Cellular Systems ◽  
Convex Polyhedra ◽  
Quantitative Characterization ◽  
Topological Characterization ◽  
Shape Factors ◽  
3 Dimensional ◽  
Cellular Models ◽  
Finite Set

To characterize topologically the polycrystalline microstructure of single-phase alloys computer simulations are performed on 3-dimensional cellular models. These infinite periodic cellular systems are constructed from a finite set of space filling convex polyhedra (grains). It is shown that the appropriately selected topological shape factors can be successfully used for the quantitative characterization of computer-simulated microstructures of various types.

Quantitative Characterization of Particle Shape of FCC Catalysts by Image Analysis

2001 ◽  
Vol 7 (S2) ◽  
pp. 1086-1087
Author(s):  
Zhengmin Li ◽  
Xingzhong Xu ◽  
Jinghe Yang ◽  
Xiuling Xu ◽  
Weijun Yu ◽  
...  
Keyword(s):  
Particle Shape ◽  
Glass Slide ◽  
Oil Refinery ◽  
Quantitative Characterization ◽  
Shape Factors ◽  
Fcc Catalyst ◽  
Fluidized Catalytic Cracking ◽  
Attrition Resistance ◽  
Fcc Catalysts

In the fluidized catalytic cracking (FCC) unit of oil refinery, the attrition resistance of FCC catalysts is affected by particle shape. Although some sophisticated methods, such as Fractal dimension and Fourier analysis, have been introduced to particle shape analysis, most of them are used to assess the shape of individual particle. It is difficult to be used as a means of powder quality control in the course of application and production of FCC catalysts. So three shape factors, i.e. Short/long ratio (S), Roundness (R) and Concavity (C), are applied to characterize them in three different aspects.A small quantity of FCC catalyst powders were spread on a glass slide M and a thin layer of glue was spread on another glass slide N, then all the particles on slide M were sprinkled on slide N by vibrating manually up and down, in the meantime moving back and forth more than 10 times.

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