Processing of porcelain enamel powders for electrostatic spraying

Following a brief review on current technology of electrostatic spray for enameling, the requirements on powder properties were discussed.

The use of poly (siloxanes) or poly (silanes) as encapsulants for producing electrostatic porcelain enamel powders with appropriate electrical resistivity, hydrophobicity and fluidity was analyzed from a mechanistic standpoint.

Experimental results were presented to illustrate typical processing problems such as the change of powder properties on aging as a result of differential encapsulation of glass components. Various measures were proposed for improving the stability of powder properties. Optimization of powder processing parameters by means of experimental design technique was described.

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