Composite cellulose fibres with magnetic properties
Waldemar Kaszuwara*, Marcin Leonowicz*, Marcin Rubacha**, Piotr Kulpiński**,Bogumił Łaszkiewicz**, Piotr Pawlik***, Zhongwu Liu****, Hawel A. Davies**** *Politechnika Warszawska, Wydział Inżynierii Materiałowej, Centrum Doskonałości NanoCentre, ul. Wołoska 141, 02-507 Warszawa **Politechnika Łódzka, Katedra Włókien Sztucznych, ul. Żeromskiego 116, 90-543 Łódź ***Politechnika Częstochowska, Wydział Inżynierii Procesowej, Materiałowej i Fizyki Stosowanej, al. Armii Krajowej 19, 42-200 Częstochowa ****Department of Engineering Materials, University of Sheffield, Mappin St., Sheffield SI 35D, UK
Annals 4 No. 9, 2004 pages 36-40
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abstract Processing method of composite ferromagnetic cellulose matrix fibres containing soft magnetic or hard magnetic powder has been developed. Soft and hard magnetic ferrites and Nd-Fe-B alloy have been used as a fibre components. Pure cellulose has been disolved in N-oxide-N-methylomorpholine and mixed with magnetic powders. Particles of powder are randomly and homogeneously distributed in fibres volume (Fig. 3). Tensile strength and Young’s modulus decrease with increasing magnetic powder content (Fig. 4). The coercivity of composite fibres is equal to the coercivity of initial powder and does not depend on the powder content (Figs 6, 9). The remanence increases with increasing content of the magnetic material. In the case of soft ferrite, experimental values of the remanence are proportional to the ferrite content (Fig. 6). The remanence values for fibres containing Nd-Fe-B powder are lower then those calculated on the basis on Nd-Fe-B remanence and powder volume fraction (Fig. 10). This difference is probably caused by reaction of Nd-Fe-B powder with cellulose solvent. Key words: cellulose fibres, hard magnetic composites, soft magnetic composites