Implementation of the Powder Dispensing of Digitization

Dose uniformity is one of the important factors in evaluation of microfeeding of fine powders. This paper describes a method for metering and dispensing the fine metal powders. The principle of the powder dispensing of digitalization is distinct from ultrasonic microfeeding, and it not only achieved continuous feeding, but also guaranteed dose uniformity. To avoid the relative movement and with a quest for simplicity and miniaturisation, powder dispensing of digitalization in quartz glass fine capillaries was selected and piezoelectric ceramic driver was used to provide the pulse local inertia force as driving force. Lots of basal experiments were carried out with siezed cuts of metal powder on the built system. Many factors that influenced the flow rate and the discharge stability were investigated, including drive parameters, nozzle diameters, and the properties of powder. Finally, one micro array with the powder dose diameter about 200μm had been made.