Reduction annealing of very fine electrolytic iron powders with organic coatings

Effect of different production methods on the properties of permanent magnet powders

“…This paper studies how methods of producing PPMs with a polymer binder influence their properties. The materials were made of quasi-single-domain iron particles and iron-cobalt alloy with an organic coating.To produce PPMs, we used superfine powders electrolyzed in a two-layer bath, which were subjected to recovery annealing as described in [3,4]. The methods previously outlined in [5][6][7] were used to make reference samples of these powders, examine their magnetic and mechanical characteristics, and determine their chemical composition.…”

“…To produce PPMs, we used superfine powders electrolyzed in a two-layer bath, which were subjected to recovery annealing as described in [3,4]. The methods previously outlined in [5][6][7] were used to make reference samples of these powders, examine their magnetic and mechanical characteristics, and determine their chemical composition.…”

Oxidation of electrolytic ferromagnetic powders with a composite organic coating

“…The powders thus obtained were subjected to reduction annealing at 633 -653 K [3,4]. Preparation of sample specimens and determination of magnetic properties was carried in accordance data provided in [5,6]. The oxidation capacity of powders was evaluated from the change in their magnetic properties and weight during isothermal soaking for 5 h. The composition of the surface layer was assessed from DTA data and infrared spectroscopy [7,8].…”

Theory, manufacturing technology, and properties of powders and fibers

“…The resulting powder was subjected to reduction annealing at 633 to 653 K [3,4]. Witness samples were produced and their magnetic properties were determined as recommended in [5,6]. Changes in the magnetic properties and weight of the powders after isothermal holding for 5 h served to assess their oxidability.…”