Next to the main aluminium ore, bauxite, an assemblage of aluminium hydroxides, aluminium oxides and other minerals (gibbsite, diaspore, boehmite, kaolinite, quartz, hematite, goethite, rutile, anatase, and alumogel), aluminium oxides find direct application in diverse industrial processes (e.g., refractory, abrasives, and watch-making industries) as well as in the gemstone sector. Corundum (Al...

The abrasion mechanism in solid-solid contact mode of the chemical mechanical polishing (CMP) process is investigated in detail. Based on assumptions of plastic contact over wafer-abrasive and pad-abrasive interfaces, the normal distribution of abrasive size and an assumed periodic roughness of pad surface, a novel model is developed for material removal in CMP. The basic model is = removed, wh...

The relationship between the wear of three composite resins and the hardness of the abrasive was studied by a two-body abrasion test. The wear rates of the composites increased linearly with abrasive hardness from 530 to 2080 KHN. Measurement of the slope of the wear rate versus abrasive hardness over this range provided a sensitive method for ranking the composites.

Cutting edge preparation has become more important for tool performance. The micro-shape, radius and surface topography of the cutting play a significant role in machining process. solid carbide end mills some micro-defects after grinding. For eliminating aforementioned problem, this study investigates drag finishing (DF) to reconstruct micro-geometry. This paper is present design DF experiment...

Multiple colors visible to the naked eye across internal surfaces of stainless-steel 304 tubes polished with a magnetic abrasive finishing (MAF) process were investigated at varying levels magnification. The found result from microscopic colored features four different hues — green, blue, red, and yellow having irregular sizes shapes. Spectral analysis their dispersion indicates that these appe...

In the finishing process of optical glass, polishing with ceria, silica or zirconia slurry is conventionally adopted. The machining process, however, has problems involving inefficiency and a detrimental impact on the environment. Therefore, it is strongly recommended that the process be replaced with fixed-abrasive machining, but conventional fixed-abrasive tools have problems relating to low ...

Abstract. This paper establishes an analytical solution for describing the trajectories of abrasives in polishing spherical surfaces when the motions of the tool and workpiece involve three independent angular velocities. As an example of its applications, the solution is used to show the effect of angular velocities on the trajectory coverage uniformity on a spherical surface – a key aspect fo...