Karakterisasi Sifat Mekanik Dan Magnetik Pada Magnet Komposit Hybrid Bafe/ndfeb Dengan Matrix Polivinil Alkohol Dan Karboksimetil Selulosa

Abstract

ABSTRAK
Bahan baku pembuatan magnet permanen Barium ferit (BaFe) sangat berlimpah di Indonesia, namun nilai remanensinya hanya sepertiga dari NdFeB. Pada penelitian ini, BaFe dipadukan dengan NdFeB (hybrid) menggunakan matrix PVA dan CMC sebagai pengikatnya (binder) untuk mendapatkan sifat mekanik dan magnetik yang lebih unggul dari pada BaFe murni. Pada penelitian ini, komposisi BaFe/NdFeB serta konsentrasi matrix PVA dan CMC divariasikan untuk mengetahui tren sifat mekanik dan magnetik yang dihasilkan. Komposisi BaFe/NdFeB divariasikan pada 7:3, 5:5 dan 3:7 dari massa total 2,5 gram. Selain itu, matrix PVA dan CMC masing-masing divariasikan pada konsentrasi 0,1 wt%, 1 wt%, dan 2 wt%. Keseluruhan variasi sampel tersebut dianalisis sifat mekaniknya yang meliputi citra sebaran partikel, densitas, dan nilai kuat tekan (compressive strength), serta sifat magnetiknya untuk mengetahui nilai parameter magnetik yang meliputi remanensi (Br), koersifitas (Hc) dan produk energi maksimum (BHmax) yang dihasilkan. Berdasarkan data yang diperoleh dari penelitian ini, penambahan komposisi NdFeB menyebabkan kenaikan nilai densitas dengan densitas tertinggi sebesar 5.1 g/cm3 dan kenaikan remanensi magnetik dengan kenaikan rata-rata sebesar 1 kG untuk setiap penambahan wt% serta peningkatan nilai kuat tekan compressive strength. Penambahan konsentrasi matrix baik PVA maupun CMC menyebabkan penurunan densitas dan remanensi magnetik. Namun, compressive strength yang dihasilkan berbanding lurus terhadap konsentrasi matrix yang ditambahkan
Kata kunci: hybrid BaFe/NdFeB, matrix PVA, CMC,variasi komposisi, sifat mekanik, sifat magnetik

Abstract
The raw material for permanent magnets barium ferrite (BaFe) is very abundant in Indonesia. In this study, BaFe was combined with NdFeB (hybrid) using PVA and CMC matrices as bonded to obtain better mechanical and magnetic properties than pure BaFe. In this study, the composition of BaFe / NdFeB and the concentration of PVA and CMC matrices were varied to study the trends of the hybrid mechanical and magnetic properties. The variation of BaFe / NdFeB composition were 7: 3, 5: 5, and 3: 7 with total mass of 2,5 grams. In addition, each PVA or CMC matrix was varied at a concentration of 0,1 wt%, 1 wt%, and 2 wt%. The mechanical properties characterization includes particle distribution image, density calculation, and compressive strength measurement. The magnetic properties are studied by measuring the remanence (Br), coercivity (Hc) and maximum energy product (BHmax). The results showed that the addition of NdFeB increase the density with highest density of 5,1 g/cm3 , the magnetic remanence also increase with the average increase of 1 kG for each addition of wt% and also increase the compressive strength of BaFe/NdFeB hybrid sample. The addition of matrix concentration, for both PVA and CMC, decreases the sample density and magnetic remanence. However, the compressive strength were observed directly proportional to the addition of matrices concentration.
Keywords: hybrid BaFe/NdFeB, PVA, CMC, matrix, composition of variation, mechanical properties, magnetic properties