diplomsko delo
Povzetek
Trajni magneti, ki se jih izdeluje s postopkom sintranja, so trdi in krhki. Ravno zaradi
teh lastnosti niso primerni za uporabo na vseh področjih. V aplikacijah, kjer taki
magneti ne pridejo v poštev, je smiselna uporaba plastomagnetov. Gre za materiale,
izdelane iz magnetnih prahov, katerih delce povezuje določeno vezivo, na primer
razne smole, gume ali polimeri.
V sklopu diplomskega dela smo izdelali plastomagnetni material na osnovi
magnetnega prahu stroncijevega heksaferita (SrFe12O19) z vezivom polifenilen sulfida
(PPS), ki smo mu dodali tekočekristalni polimer (LCP). Zanimal nas je vpliv slednjega
na gostoto in magnetne ter mehanske lastnosti. Izdelali smo predmešanico
magnetnega prahu z dodanima aditivoma in polimerno predmešanico obeh
uporabljenih polimerov. Pripravljeni predmešanici smo s tehnologijo ekstrudiranja
oblikovali v granulat, ki smo ga nato posušili. Z injekcijskim brizganjem smo posušen
granulat preoblikovali v vzorce, na katerih smo izvajali preiskovalne metode.
Magnetnim valjastim vzorcem smo najprej izmerili gostoto ter s pomočjo magnetenja
in razmagnetenja določili glavne magnetne lastnosti materiala. Na preizkušancih v
obliki epruvet smo izvedli tritočkovni upogibni preizkus za določanje upogibnih
karakteristik ter natezni preizkus za določanje trdnostnih in preoblikovalnih lastnosti.
Rezultate meritev izdelanega materiala smo primerjali z enakim materialom brez
dodanega tekočekristalnega polimera.
Ključne besede
SrFe12O19;PPS;LCP;ekstruzija;injekcijsko brizganje;
Podatki
Jezik: |
Slovenski jezik |
Leto izida: |
2021 |
Tipologija: |
2.11 - Diplomsko delo |
Organizacija: |
UL NTF - Naravoslovnotehniška fakulteta |
Založnik: |
[A. Uršič] |
UDK: |
669 |
COBISS: |
71561475
|
Št. ogledov: |
409 |
Št. prenosov: |
125 |
Ocena: |
0 (0 glasov) |
Metapodatki: |
|
Ostali podatki
Sekundarni jezik: |
Angleški jezik |
Sekundarni naslov: |
Influence of liquid crystalline polymer addition to SrFe12O19 composite system with polyphenylene sulphide |
Sekundarni povzetek: |
Permanent magnets made by the sintering process are hard and brittle. For this very
reason, they are not suitable for all applications. In applications where the use of
such magnets is not possible, we can use bonded magnets. They consist of
magnetic powders whose particles are bound by a special binder, such as various
resins, rubbers or polymers.
As part of the diploma work, we prepared a plastic magnetic material based on the
magnetic powder of strontium hexaferrite (SrFe12O19) with a polyphenylene sulphide
(PPS) as a binder, to which we added a liquid crystalline polymer (LCP). We were
interested to see the effect of the latter on the density, magnetic and mechanical
properties. We prepared a premix of magnetic powder with additives and a polymer
premix of both polymers. The prepared premixes were converted into composite
granules using extrusion technology, which were later dried. Injection molding was
used to convert the dried granules into samples that were used as part of a research
method. First, the density was measured using magnetic cylindrical samples and the
main magnetic properties of the material were determined using magnetization and
demagnetization. A three-point bending test was performed on the test specimens in
the form of test tubes to determine the bending properties, followed by a tensile test,
used to determine the strength and forming properties. The measurement results of
the prepared material were compared with the same material without the addition of
liquid crystalline polymer. |
Sekundarne ključne besede: |
SrFe12O19;PPS;LCP;extrusion;injection molding; |
Vrsta dela (COBISS): |
Diplomsko delo/naloga |
Študijski program: |
0 |
Konec prepovedi (OpenAIRE): |
1970-01-01 |
Komentar na gradivo: |
Univ. v Ljubljani, Naravoslovnotehniška fak., Oddelek za materiale in metalurgijo |
Strani: |
XII, 43 f. |
ID: |
13085138 |