ANALISIS STRUKTUMIKRO MAGNET PERMANEN SISTEM NdFeB-SmCo

Abstract

ABSTRAK
ANALISIS STRUKTURMIKRO MAGNET PERMANEN SISTEM NdFeB-SmCo. Telah dilakukan
penelitian magnet hibrida berbasis Sm2Co17 dan Nd2
Fe14B dengan komposisi 80% Sm(Co,Fe,Cu,Zr)8.5 dan
20% Nd12Fe82B6
(% berat). Proses preparasi pembentukan struktur komposit yang dimaksud adalah melalui
teknik konvensional metalurgi serbuk. Proses ball mill dilakukan pada serbuk dengan variasi waktu milling
2 jam sampai dengan 22 jam. Dari serbuk material hibrida hasil proses milling ini dilakukan pembuatan magnet
hibrida melewati proses sintering dengan suhu sintering 1100 0C, 1130 0C, dan 1160 0C. Studi identifikasi fasa
terhadap sampel magnet dengan XRD menunjukkan bahwa fasa magnet utama yaitu Sm2Co17 dan Nd2
Fe14B
dapat dipertahankan, meskipun telah menjalani proses perlakuan panas. Namun pada sampel magnet hibrida
dengan ukuran serbuk semakin halus yaitu hasil penghalusan dengan waktu relatif lama diidentifikasikan fasa
oksida berupa Sm2O3
, NdO2
, Nd2O3
. Ditemukan bahwa suhu 1160 0C merupakan suhu pemadatan optimal
untuk menjadikan fasa 2/17 sebagai fasa dominan pada sampel magnet hibrida.

ABSTRACT
ANALYSIS MICROSTRUCTURE OF PERMANENT MAGNET SYSTEM NdFeB-SmCo. The
investigation of hybrid permanent magnet based on Sm2Co17 and Nd2
Fe14B which was made from 80 wt%
powder Sm(Co,Fe,Cu,Zr)8.5 and 20 wt% powder Nd12Fe82B6
, prepared by powder metallurgy process had
been done. Both Sm(Co,Fe,Cu,Zr)8.5 and Nd12Fe82B6
alloy powders were mechanically milled for various times
from 2 h up to 22 h in toluene atmosphere. These alloy milled powders was made hybrid permanent magnet
sample through sintering at temperature 1100 0C, 1130 0C, and 1160 0C and followed annealling process. The
phase and microstructure changes after sintering and heat treatment had been investigated using XRD and
SEM. The result showed that the main phase Sm2Co17 and Nd2
Fe14B was maintained after heat treatment
process and the oxide phase such as NdO2
, Nd2O3
, Sm2O3 was increased with the increasing milling time.
Sintering at 1160 0C was the optimum temperature to make the sample compact and Sm2Co17 phase dominant
at hybrid permanent magnet.