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Stabilnost fizikalnih in mehanskih lastnosti brizganih NdFeB plastomagnetov : magistrsko delo
ID Sedej, Sara (Author), ID Bizjak, Milan (Mentor) More about this mentor... This link opens in a new window, ID Drmota, Ana (Comentor)

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Abstract
V magistrskem delu smo raziskovali vpliv časa staranja plastomagneta na fizikalne in mehanske lastnosti kompozitnega trdo-gnetnega materiala (plastomagneta) na osnovi prahu NdFeB s termoplastično polimerno matrico polifenilen sulfid (PPS). Izdelali smo predmešanico magnetnega prahu, termoplastične polimerne matrice in aditiva ter s procesom kompoundiranja in granuliranja izdelali granulat. S tehnologijo brizganja smo izdelali preizkušance in jih starali. Po staranju smo izmerili magnetne in mehanske lastnosti ter izvedli dodatne meritve, kot so določanje deleža vlage v granulatu, meritve tekočnosti in izvedli mikroskopsko analizo. Rezultate smo primerjali med seboj ter izrisali grafe, ki prikazujejo spreminjanje lastnosti v odvisnosti od časa. Izdelali smo šest serij različnih kompozitov (plastomagnetov) z enako sestavo. Med izdelavo kompozitov smo spreminjali delež vlage v granulatu in izvedli temperiranje vzorcev. Prav tako smo izdelali plastomagnet, izdelan s parametri, kot se ga navadno izdeluje v proizvodnji. Naša hipoteza je bila, da je glavni vzrok za spremembo lastnosti plastomagneta prisotna vlaga v granulatu, ki povzroči oksidacijo in posledično slabšo kompatibilizacijo med delci magnetnega prahu ter termoplastično polimerno matrico. Zato smo z različnimi karakteristikami pridelave in predelave granulata želeli eliminirati vpliv vlage, da bi preprečili padec oz. poslabšanje mehanskih lastnosti tekom staranja plastomagneta. Poleg staranja preizkušancev smo izvedli še test staranja granulata, da bi ugotovili, ali pride do padca mehanskih lastnosti zaradi staranja granulata. Po staranju granulata smo z brizganjem izdelali preizkušance ter izvedli meritve.

Language:Slovenian
Keywords:plastomagnet, mehanske lastnosti, magnetne lastnosti, NdFeB, polifenilen sulfid
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:NTF - Faculty of Natural Sciences and Engineering
Place of publishing:Ljubljana
Publisher:S. Sedej
Year:2023
Number of pages:XV, 63 f.
PID:20.500.12556/RUL-151201 This link opens in a new window
UDC:669
COBISS.SI-ID:167880963 This link opens in a new window
Publication date in RUL:30.09.2023
Views:521
Downloads:36
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Secondary language

Language:English
Title:Stability of physical and mechanical properties of injected NdFeB polymer bonded magnets : master's thesis
Abstract:
In the master's thesis, we investigated the influence of time on the mechanical properties of a bonded magnet based on NdFeB magnetic powder with a thermoplastic polymer matrix polyphenylene sulfide (PPS). We made a premix of magnetic powder, thermoplastic polymer matrix and additive. A granulate was produced through the process of compounding and granulation. Test pieces were made on an injection molding machine and aged. After predetermined aging, magnetic and mechanical properties were measured. We compared the results with each other and drew graphs showing changes in these properties as a function of time. We made six different sample materials with different parameters, e.g. drying and moistening of granulate, production in an inert atmosphere, tempering of samples and material produced with serial parameters, as it is usually produced in production. Our hypothesis was that the main influence for changes in the properties of the material is the presence of moisture, which causes oxidation and consequently worse adhesion between the magnetic powder particles and the polymer particles. That is why we use different parameters in the production of granulate or later on the samples for measurements wanted to eliminate the influence of moisture in order to achieve better results during aging. In addition to the aging of the test subjects, we also performed an aging test of the granulate in order to determine whether there is a drop in mechanical properties already within the granulate. After aging of the granulate, the test specimens were injected and measurements were taken.

Keywords:bonded magnet, mechanical properties, magnetic properties, NdFeB, polyphenylene sulphide

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