Electrostatic Application of Vitreous Enamel in Dry Powder Form

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Abstract
The behaviour of a powder for electrostatic deposition is shown to be a function of its resistivity and particle size distribution. To achieve a coating, fine powders and low deposition voltages are required. By drying vitreous enamel powders, the resistivity will increase and lay in the intermediate range 109 - 1012 Ωm. To date the optimum resistivity achieved is 1012 Ωm. In the intermediate range the significant parameter is the current density through the deposited layer. The choice of particle size distribution when operating in the intermediate resistivity range is an inevitable compromise. Reducing the particle size increases the resistivity and improves adhesion, but incurs economic penalties and reduces electrostatic deposition efficiency. In addition, extremely fine powders are difficult to fluidize reproducibly. The region for operating powders in this size range is discussed with respect to the electrical properties of the deposit.

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