Characterisation of grinding media wear by visual texture

Three methods of automated characterisation of visual texture—spatial grey-level dependence matrix (SGLDM), grey-level run length (GLRL) and grey-level partial derivatives (GLPD)—have been applied to assess indirectly the wear of grinding media from series of grey-level photographs obtained by scanning electron microscopy (SEM) at different magnifications (between 350 and 5000). The three methods are complementary, but for a routine analysis, the use of a single intermediate magnification (c1500), combined with the SGLDM method, could be advocated to compare the degree of wear

METHODE D’ANALYSE DES PARTICULES; LA MORPHOLOGIE PAR ANALYSE D’IMAGES

The aim of our work is to establish a morphological characterization of particles. The particle size analysis determines the size distribution of a population of particles using a laser granulometer device. The evolution of particle size distributions is complemented by a study on the particle shape. Thus, morphological analysis consists to acquire images of the particles by using a scanning electron microscopy which will be then processed using an algorithm. The treatment is a set of operations that are thresholding, erosion, expansion and reconstruction of the image. Data processing is performed based on a set of dimensional parameters

Morphological characterisation of gibbsite and alumina

International audienc

Wet grinding of gibbsite in a bead-mill

International audienc

Method for producing a component having a high thermal loading capacity and coated with a heat protective layer

NOVELTY - Production of a component (23) coated with a heat protection layer (21) and having a high thermal load capacity comprises applying an adhesion layer (22) containing aluminum on the surface of the component, and applying the heat protection layer on the adhesion layer. A thin auxiliary layer (24) made from nano-crystalline alpha-Al2O3 is formed on the adhesion layer before the heat protection layer is applied. USE - Used in the production of gas turbines. ADVANTAGE - The component has a long service life. DETAILED DESCRIPTION - Preferred Features: The auxiliary layer is directly deposited on the surface of the adhesion layer. The component is made from a super alloy. The adhesion layer is made from an MCrAlY alloy (where M = Fe, Co and/o Ni). The heat protection layer is made from Y-stabilized zirconium dioxide. The auxiliary layer is approximately 10 mum thick

Morphologie des particules : de la visualisation à la mesure

National audienc

Morphologie des particules : de la visualisation à la mesure

National audienc