발간논문

Home > KJMM 논문 > 발간논문

Vol.34, No.2, 158 ~ 166, 1996
Title
Research Paper - Transformations - : Spinodal Decomposition and Magnetic Properties of Sintered Alnico Magnets via Rapidly Solidified Powders
최승덕Seung Duck Choi, 양충진Choong Jin Yang
Abstract
A new process for making Alnico type(Fe-Co-Ni-Al-Ti-Cu) permanent magnets was developed via the rapid solidifcation technology. The process includes extractive rapid solidifcation, pulverization and sintering. Magnetic properties of the Alnico type magnets were found to be subject to the shape and distribution(aspect ratio) of magnetically hard α₁ precipitates(Fe-Co rich). The higher the aspect ratio of the α₁ particles the better the magnetic properties were obtained. During heat treatment at a magnetic field(900∼600℃) an optimized aspect ratio of the α₁ particles was controllable for which parameters of the treatment are dependent upon the initial grain size of the rapidly solidified powders. The best magnetic properties of Alnico 8 type sintered magnets were obtained from the alloys containing 7.4 wt.%Ti heat treated isothermally at 820℃ for 15 minutes. The resulting properties were : H=2045 Oe, B_r = 7800 Gauss and (B.H)_(max) = 5.34 MGOe, respectively.
Key Words
| PDF
대한금속∙재료학회 │ (06633) 서울시 서초구 서초대로 56길 38 대한금속∙재료학회 회관 (서초1동 1666-12번지)
Tel : 070-4266-1646 │ FAX : 02-557-1080 │ E-mail : metal@kim.or.kr
Copyright ⓒ 2013 사단법인 대한금속∙재료학회 All rights reserved.