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Production of MnZn ferrites with high permeability and low magnetic loss by co-precipitation method

Grant number: 02/12889-8
Support Opportunities:Research Grants - Innovative Research in Small Business - PIPE
Duration: May 01, 2003 - July 31, 2006
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Suzilene Real Janasi
Grantee:Suzilene Real Janasi
Host Company:Imag Indústria e Comércio de Componentes Eletrônicos Ltda (IMAG)
City: Ribeirão Pires

Abstract

MnZn Ferrites (ceramic insulators with low density of zinc manganese) are commercially obtained by the ceramic process which involves solid state reactions between oxide precursors or carbonates at high temperatures (above 1100 degrees Celsius). The resultant particles from this process are relatively large and not of uniform size, and the products obtained do not offer good reproducibility. Faced with these difficulties, the co-precipitation method looks like an interesting alternative. Using this method it is possible to achieve a more chemically homogeneous powder, with finer, more uniform particles and good reproducibility. This project proposes the production of MnZn ferrites by the co-precipitation method, with the principal objective of obtaining a material with high permeability and low magnetic loss for use in impedance nuclei, a product for which demand has been growing in the national market. The research will especially focus on the synthesis of the precursor powder and on processing. To make the production of these ferrites viable and to guarantee that the final product offers better properties than that produced by the ceramic method, all the conditions of synthesis are being defined on laboratory scale. Equal care will be taken in the processing of the synthesized powder, principally where it concerns the sinterization cycle, an elaborate and important stage in the processing of MnZn ferrites, when properties of high permeability and low losses are desired. (AU)

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