고에너지 볼밀링된 Sm-Co 합금 분말의 미세조직 및 자성특성에 미치는 공정변수의 영향
Effect of Process Parameters on Microstructure and Magnetic Properties of Sm-Co Alloy Powder Prepared by High Energy Ball Milling
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Sm-16.7wt%Co alloy powders were prepared by high energy ball milling under the conditions of various milling time and the content of process control agent (PCA), and their microstructure and magnetic properties were investigated to establish optimum processing conditions. The initial powders employed showed irregular shape and had a size ranging from 5 to 110 μm. After milling for 5 h, the shape of powders changed to round shape and their mean powder size was approximately 5 μm, which consisted of the agglomerated nano-sized particles with 15 nm in diameter. The coercivity was reduced with increasing the milling time, whereas the saturation magnetization increased. As the content of PCA increased, the powder size minutely decreased to approximately 7μm at the PCA content of 10 wt%. The XRD patterns showed that the main diffraction peaks disappeared apparently after milling, indicating the formation of amorphous structure. The measured values of coercivity were almost unchanged with increasing the content of PCA.
Abstract
Sm-16.7wt%Co alloy powders were prepared by high energy ball milling under the conditions of various milling time and the content of process control agent (PCA), and their microstructure and magnetic properties were investigated to establish optimum processing conditions. The initial powders employed showed irregular shape and had a size ranging from 5 to 110 μm. After milling for 5 h, the shape of powders changed to round shape and their mean powder size was approximately 5 μm, which consisted of the agglomerated nano-sized particles with 15 nm in diameter. The coercivity was reduced with increasing the milling time, whereas the saturation magnetization increased. As the content of PCA increased, the powder size minutely decreased to approximately 7μm at the PCA content of 10 wt%. The XRD patterns showed that the main diffraction peaks disappeared apparently after milling, indicating the formation of amorphous structure. The measured values of coercivity were almost unchanged with increasing the content of PCA.
참고문헌 (8)
- Y. Liu, , J. Mag.Mag. Materials, 116, pp.320~ (1992)
- M. Ito, , J. Alloy and Compounds, 329, pp.272~ (2001)
- H. J. Fecht, , 6, pp.33~ (1995)
- X. Y. Qin, , J. Appl. Phys, 86, pp.2146~ (1999)
- B. D. Cullity, "Introduction to Magnetic Materials" (2006), Wesley-IEEE
- C. C. Koch, , Appl. Phys. Lett, 43, pp.1017~ (1983)
- J. S. Benjamin, , Metall. Trans, 5, pp.1929~ (1974)
- B. S. Kim, , Modern Phys. Lett. B, 23, pp.3919~ (2009)