Stronsiyum Hekzaferrit Esaslı Ticari Seramik Mıknatısların Mikroyapısal Ve Manyetik Karakterizasyonu

Year 2020, Volume: 12 Issue: 1, 40 - 46, 31.01.2020

Burcu Ertuğ

https://doi.org/10.29137/umagd.542032

Abstract

Bu çalışmada, SrFe₁₂O₁₉ esaslı
ticari ferrit mıknatıslarının, mikroyapısal ve manyetik karakterizasyonu
yapılmıştır. Yoğunluk hesaplamaları, Y30BH ve DM33H örneklerde sırasıyla, 9,4
ve 4,9 g/cm³ değerlerine karşılık gelen düşük porozite yüzdeleri
vermiştir. Örneklerde taneler arası porozite yüzdesinin düşük olduğu, Taramalı
Elektron Mikroskobu (SEM) incelemeleri ile de doğrulanmıştır. Manyetik
özellikler için histerizis eğrileri, Titreşimli Örnek Manyetometresi (VSM) ile
belirlenmiştir. Doyma ve kalıcı manyetizasyonlar, Y30BH örnek için sırasıyla,
56,45 emu/g ve 32 emu/g olup DM33H örneğin manyetizasyon değerlerinden daha
yüksektir. Y30BH örneğin yüksek manyetizasyonu, stronsiyum hekzaferrit faz
miktarının yüksek olması ile açıklanabilir. Y30BH örnekte yüksek manyetizasyona
daha düşük koerzivite, Hc 3750 Oe değeri eşlik etmektedir. Y30BH ve DM33H
mıknatıslarda maksimum enerji çarpanı (BH)max ise, sırasıyla 55,7 ve 34,2 kJ/m³
olarak hesaplanmıştır.

Keywords

Hekzaferrit, sert mıknatıs, histerizis, manyetizasyon

Microstructural And Magnetic Characterization Of The Commercial Strontium Hexaferrite Ceramic Magnets

Abstract

In the present study, the microstructural
and magnetic characterization of the commercial SrFe₁₂O₁₉ magnets
have been carried out.Density calculations for Y30BH and DM33H
samples yielded 9.4 and 4.9 g/cm³, respectively corresponding to low
porosity percentages.Scanning Electron Microscopy (SEM)
examinations confirmed that there is a low amount of intergranular porosity.
The magnetic hysteresis curves have been determined by using Vibrating Sample
Magnetometer (VSM). The saturation and remanent magnetization of Y30BH sample
have been 56.45 emu/g and 32 emu/g, respectively thus they have been higher
than those of DM33H sample. Improved magnetization of Y30BH sample can be
attributed to the high content of strontium hexaferrite phase with a lower
coercivity, Hc 3750 Oe. Maximum energy products, (BH)max have been calculated
to be 55.7 and 34.2 kJ/m³, respectively for Y30BH and DM33H magnets.

Keywords

Hexaferrite, hard magnet, hysteresis, magnetization

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