Abstract
Electrostatically coated abrasives have drawn vast attention in many industrial applications. Therefore, influence of humidity on the electrical properties of α-SiC and α-Al2O3 abrasive powders with three μm-range particle sizes are here investigated using electrostatic charge and DC resistivity analysis. From the three particle size ranges used, 15–16 μm, 60–63 μm and 153–156 μm, the intermediate one (60–63 μm) is found to be associated with the highest charge values, measured using a double Faraday cup method, as well as the highest resistivity for both materials. However, comparing SiC and Al2O3 powders, the latter ones present about twice larger charges in dry and normal humidity states accompanied by several orders of magnitude larger resistivity. Under humid conditions all the powders reveal diminishing charge and resistivity values.
Highlights
Grinding coatings or coated abrasives are widely used in our life from household needs to construction, decoration, furniture and automotive industry
While Al2 O3 powders reveal mainly α-phase [7] with structure shown in inset of Figure 1b, SiC
Present 4H- and 6H-modifications of α-phase [8,9], with the phase ratio of about 1:2 and structures indicated in inset of Figure 1a
Summary
Grinding coatings or coated abrasives are widely used in our life from household needs to construction, decoration, furniture and automotive industry. In its turn the fabrication of coatings uses electrostatic method [1], i.e., abrasive powders are attached to a flexible base filled with glue under an electric field. The measurement and quantification of the surface electrostatic charges of the powder particles is quite relevant to optimize the fabrication conditions. KPM is inapplicable for the abrasive powder characterisation with separated particles of micron size range. ZP measurement or zetametry can help to estimate the surface charge and it is a widely used method, but it can only be performed in liquid media and on relatively small particles [4,5]. The electrostatic charge at the particle surface can be measured using Faraday cup method [6]
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