Karakterizacija hibridnih magnetnih materialov SrFe12019-Sm2Fe17N3 in SrFe12019-Nd2Fe14B vezanih s PPS polimerom

Gantar, Martin (author)

Permanentni magneti imajo dobre magnetne lastnosti, ki se lahko kaj kmalu poslabšajo zaradi slabe odpornosti proti koroziji ter izpostavljanju višjimi temperaturam. V diplomski nalogi smo preiskovali dva hibridna materiala: SrFe12O19/Sm2Fe17N3 in SrFe12O19/Nd2Fe14B, vezana s polimerom PPS. Najprej smo naredili analizo prahov, katere smo uporabili za izdelavo vzorcev. Iz prahu smo najprej izdelali granulat, iz katerega smo nato po postopku injekcijskega brizganja zabrizgali vzorce. S postopnim magnetenjem in merjenjem magnetnega momenta smo določili krivuljo magnetenja, s katero lahko določimo točko nasičenja. Magnetne karakteristike smo določevali s permagrafom. Permagraf je izrisal razmagnetilno krivuljo, iz katere je nato program odčital podatke o remanenci, koercitivnosti ter maksimalnem energijskem produktu. Za določitev trdnosti smo uporabili tri-točkovni upogibni preizkus. Glavni namen diplome je bil preveriti obstojnost magnetnih karakteristik, ko je magnet izpostavljen različnim vplivom okolja. Opazovali smo spremembo magnetnega momenta magnetnih vzorcev ter magnetnega pretoka rotorjev, izdelanih iz teh dveh materialov.

• Language: Slovenian
• Keywords: plastomagneti, Sm2Fe17N3, Nd2Fe14B, magnetne lastnosti, korozija
• Work type: Bachelor thesis/paper
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2018
• PID: 20.500.12556/RUL-103995
• COBISS.SI-ID: 1772383
• Publication date in RUL: 30.09.2018

Secondary language

• Language: English
• Title: Characterization of hybrid magnetic materials SrFe12019-Sm2Fe17N3 and SrFe12019-Nd2Fe14B bonded with PPS polymer

Abstract

Permanent magnets have very good magnetic properties which can decrease because of low corrosion resistance and exposure to high temperatures. In diploma thesis we tested two hybrid materials: SrFe12O19/Sm2Fe17N3 bonded with PPS polymer and SrFe12O19/Nd2Fe14B bonded with PPS polymer. Firstly we made a microstructure analysis of powders that we used to make samples. From these powders we first made pellets. We used injection molding for making our samples. With step by step magnetizing and measuring the magnetic moment of our magnets, we made a saturation curve, which shows us the point of saturation. By testing our samples with permagraf we obtained demagnetizing curve from where we got the values of remanence, coercitivity and maximal energy product. With three-point flexure test, we tested the strength of our specimens. The main test in the diploma work was stability of magnetic charactheristics in different medias. We observed how the magnetic moment of our magnets and the magnetic flux of rotors change.

• Keywords: bonded magnets, Sm2Fe17N3, Nd2Fe14B, magnetic properties, corrosion