CLAUDIO COSTA MOTTA
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Artigo IPEN-doc 16265 Determination of the crystallographic texture of sintered PrFeB magnets based on X-ray diffraction patterns2007 - PERIGO, E.A.; TAKIISHI, H.; MOTTA, C.C.; FARIA, R.N.; LIMA, N.B.Artigo IPEN-doc 16264 The effect of key process parameters on crystallographic texture and magnetic properties of PrFeB HD sintered magnets produced using high-energy milling2007 - PERIGO, E.A.; LIMA, N.B.; TAKIISHI, H.; MOTTA, C.C.; FARIA, R.N.Artigo IPEN-doc 10980 The influence of cobalt content on the magnetic properties and corrosion of PrFeCoCuNbB sintered magnets2004 - ANGELO, J.D.; TAKIISHI, H.; COSTA, I.; FARIA JUNIOR, R.N.; MOTTA, C.C.Artigo IPEN-doc 12346 Microstructure and squareness factor2007 - PERIGO, E.A.; TAKIISHI, H.; MOTTA, C.C.; FARIA, R.N.A quantitative correlation between the microstructure and squareness factor of R16 Fe76 B8 (R=Nd or Pr) sintered magnets is proposed. The expression was derived based on the micrographs of 19 magnets, making a total of more than 11 000 grains analyzed. This expression is independent of the determination of the sample's magnetic properties. Magnet processing conditions were used to modify the microstructure and, hence, the squareness factor. Six microstructural parameters-grain size, grain elongation, grain roundness, and their respective standard deviations-were quantified using an image analyzer software program. The squareness factor was higher for magnets with a microstructure showing rounder grains and a sharp size distribution. A comparison of the squareness factor obtained by the proposed expression with that calculated from the demagnetization curve showed a fairly good agreement. Some disparities were also found and are discussed herein.