Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
EFFECT OF PARTICLE SIZE IN THE COMPRESSIBILITY AND DENSITY OF PZT POWDER
Submission Author:
Mateus Mota Morais , SP
Co-Authors:
Mateus Mota Morais, Carlos Fortulan
Presenter: Mateus Mota Morais
doi://10.26678/ABCM.COBEM2019.COB2019-0493
Abstract
PZT is one of the most used piezoelectric materials in many applications because of its great electric proprieties. The manufacturing process of PZT should produce pieces with high density, small grains, and stable chemical composition. However, to achieve such quality, it is necessary to obtain optimal sintering conditions, minimizing lead loss and excessive grain growth. One possible solution is to increase powder reactivity by reducing particle size through milling. The purpose of this paper is to evaluate a possible drawback of the solution: the worst compressibility of thinner powder. PZT powder was mixed with PVB and milled in two different conditions (ball milling and vibratory milling). The compressibility of the two batches was evaluated through mechanical testing. The chemical composition of the batches was compared with the original powder to verify if there was any contamination in the milling process. The batch which was processed through vibratory milling presented a smaller average particle size. However, its packing was compromised by the narrower distribution of particle size. Therefore, although this batch would probably be sintered at lower temperatures, reducing problems of lead loss, it has lower green density, thus, more porosity. The chemical composition was not significantly changed by milling.
Keywords
ceramic, PZT, vibratory milling, ball milling, density, Granulometry
