ANALYSIS OF CORROSION PROPERTIES OF MELT SPUN Nd-Fe-B RIBBONS COATED BY ALUMINA COATINGS

作者：Sojer David^*; Skulj Irena; Kobe Spomenka; Kovac Janez; MeGuiness Paul John

来源：Materiali in Tehnologije, 2013, 47(2): 223-228.

• Nd-Fe-B
• bonded magnets
• HAST
• Al2O3 coatings

We have coated Nd-Fe-B melt spun powders, used for the production of bonded magnets via the sol-gel route by Al2O3. Topography and chemical composition of as-spun and protected ribbons was compared by Auger electron spectroscopy, X-ray photoelectron spectroscopy, secondary electron spectroscopy and electron diffraction spectroscopy. To determine the corrosion properties, we have conducted a Highly accelerated stress test, at 110 degrees C and 90 % humidity, followed by measuring the weight change. To confirm the effectiveness of the coated layer, magnetic properties were compared with a vibrating sample magnetometer. Al2O3 coatings resulted in superior corrosion resistance and magnetic properties and thus expanding the applicability of bonded magnets to severe atmospheric conditions.

• 出版日期2013-4