Electrostatic Charges of Abrasive Powders: The Role of Particle Size and Humidity

authors	Tkach, A; Garcez, M; Vilarinho, PM
nationality	International
journal	COATINGS
author keywords	grinding coatings; SiC; Al2O3; electrostatic charge; double Faraday cups; zeta potential
keywords	AQUEOUS SUSPENSION; AL2O3
abstract	Electrostatically coated abrasives have drawn vast attention in many industrial applications. Therefore, influence of humidity on the electrical properties of alpha-SiC and alpha-Al2O3 abrasive powders with three mu m-range particle sizes are here investigated using electrostatic charge and DC resistivity analysis. From the three particle size ranges used, 15-16 mu m, 60-63 mu m and 153-156 mu m, the intermediate one (60-63 mu m) 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.
publisher	MDPI
isbn	2079-6412
year published	2021
volume	11
issue	12
digital object identifier (doi)	10.3390/coatings11121520
web of science category	9
subject category	Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied
unique article identifier	WOS:000736253500001