Porosidade De Peças Prensadas De Ferrita De Zinco Com Adição Do Polipropileno Como Agente Porogênico

Abstract

Zinc ferrites (ZnFe2O4) have interesting properties and have several applications as nanometric powders and as constituents of porous scaffolds. The use of a porogenic agent is one of the ways to acquire pores in the consolidated ceramic material. Polypropylene (PP) is a porogenic agent still little studied and the interference of micronized PP in the pressed zinc ferrite macrostructure after sintering the material was investigated in this work. The nanometric ZnFe2O4 was produced by combustion in solution (SCS), manually mixed with micronized PP at concentrations of 20, 30 and 40% by mass of PP, pressed into a cylindrical tablet, sintered at 1200ºC for 2 hours and characterized by Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Archimedes Method, to study the structural modifications of ferrite after sintering. By SEM, a material with pores in micrometric dimensions was observed, the expected morphology for the processing employed. by XRD, the presence of pure phases of zinc ferrite and polypropylene was verified. Using the Archimedes Method, high apparent porosity and high densification were observed, attributed to the presence of closed pores in the pieces studied.