Y1-XSmXCo5 ribbons obtained by Melt Spinning (original) (raw)
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High performance isotropic Sm–(Co,Fe)–C and Sm–(Co,Fe,Mn)–C magnets by melt spinning
Journal of Applied Physics, 2008
The magnetic properties and microstructure of melt-spun ribbons with a composition Sm x ͑Co 1−y M y ͒ 100−x−z C z for M = Fe or Fe+ Mn and x = 10-15, y = 0-0.375, and z =0-6 have been studied systematically. The results indicate a strong dependence of the microstructure on the addition of C. The grain size decreases from few 100 nm to below 20 nm with addition of C. On the other hand, addition of Fe and Mn modifies both the saturation magnetization and the magnetocrystalline anisotropy. The Mn addition results in a coercivity of 11.7 kOe for Sm 12 ͑Co 0.75 Fe 0.185 Mn 0.065 ͒ 86.5 C 1.5 ribbons spun at 40 m / s. The highest remanence of 102 emu/ g was obtained in Sm 12 ͑Co 0.75 Fe 0.25 ͒ 83.5 C 4.5 ribbons spun at 50 m / s. A ͑BH͒ max of 14.7 MGOe with a coercivity of 5.6 kOe was obtained in as spun Sm 13 ͑Co 0.75 Fe 0.25 ͒ 82.5 C 4.5 ribbons.
Structure and magnetic properties of Sm(Co0.74Fe0.1Cu0.12Zr0.04)8 melt-spun nanostructured alloys
Materials Science and Engineering: B, 2008
Phase stability and magnetic-field-induced martensitic transformation in Mn-rich NiMnSn alloys AIP Advances 2, 042181 Field-induced lattice deformation contribution to the magnetic anisotropy J. Appl. Phys. 112, 103920 (2012) Effects of DyHx and Dy2O3 powder addition on magnetic and microstructural properties of Nd-Fe-B sintered magnets J. Appl. Phys. 112, 093912 (2012) Observation of rotatable stripe domain in permalloy films with oblique sputtering
Journal of Applied Physics, 2014
We have investigated effects of metal substitutions on the magnetic properties and microstructure of melt-spun Sm-Co-Cu-Fe-M (M ¼ Zr, V, Nb, Mo, Ta) magnets. We prepared melt-spun ribbons with compositions of Sm(Co 1Àx Cu x) 5 Fe 0.54Ày M y (x ¼ 0.1-0.5, y ¼ 0-0.43, M ¼ Zr, V, Nb, Mo, Ta). For compositions of Sm(Co 1Àx Cu x) 5 Fe 0.54 (x ¼ 0.1-0.5), coercivity increased with increasing of annealing temperature, and a high coercivity of 17.6 kOe was obtained at a Cu content of x ¼ 0.3. The coercivity was found to increase with increasing melting point of the substitution element. A high coercivity of 24.5 kOe was obtained for a composition of Sm(Co 0.7 Cu 0.3) 5 Fe 0.34 Ta 0.2. V
Sm(Co, Fe, Cu, Zr, C)8.2 ribbons for high-temperature magnets
Journal of Magnetism and Magnetic Materials, 2004
The effect of carbon substitution for cobalt on the structure and magnetic properties at room and high temperature of melt spun ribbons with composition Sm(Co 0.86Àx Fe 0.1 Zr 0.04 C x ) 8.2 and Sm(Co 0.74Àx Fe 0.1 Cu 0.12 Zr 0.04 C x ) 8.2 (x ¼ 0 À 0:015) has been studied. Arc-melted bulk samples have Th 2 Ni 17 -type structure while ribbons have TbCu 7type structure. Average grain size for Cu-free sample with x ¼ 0:005 is 23 nm while for Cu-doped samples it varies from 53 to 22 nm when x varies from 0.005 to 0.015, respectively. Coercive as-spun samples have H c B2:227:8 kOe and reduced remanence m r ¼ M r =M s up to 0.74. Ribbons of the Cu-free composition with x ¼ 0 and 0.005 and annealed at 750 C for 1 h have TbCu 7 -type structure with coercivity values 4.9 and 3.0 kOe respectively, while for x ¼ 0:01 and 0.015, FCC-Co is the dominant phase. Cu-doped ribbons with x ¼ 0:005; after annealing at 750 C for 2 h, are characterized at room temperature by square hysteresis loop with H c ¼ 8:3 kOe, reduced remanence m r ¼ 0:75 and (BH) max =6.3 MGOe. Loops at higher temperatures are also square with high m r ; for x ¼ 0:01 the magnetization is 89 emu/g and the coercive field is 1.8 kOe at 400 C. r 2004 Elsevier B.V. All rights reserved.
Nanostructured melt-spun Sm(Co-Fe-Zr-B)/sub 7.5/ alloys for high temperature magnets
Digest of INTERMAG 2003. International Magnetics Conference (Cat. No.03CH37401), 2003
High coercivity, the highest for Cu-free 2 : 17 Sm-Co ribbons, has been obtained in as-spun ( = 21 1 kOe) and short time annealed ( = 23 2 kOe) samples of Sm(Co bal Fe Zr B ) 7 5 alloys, with varying B, Zr, and Fe content ( = 0-0 06, = 0-0 16, = 0 08-0 3) and wheel speed. In as-spun samples, the TbCu 7 type structure and in annealed samples the Th 2 Zn 17 and CaCu 5 type structures is observed, plus fcc Co as minority phase is observed. Reduced remanence ( ) is higher than 0.7. High-temperature magnetic measurements show very good stability above 300 C with coercive field as high as 5.2 kOe at 330 C. For annealed Sm(Co bal Fe 0 3 Zr 0 02 B 0 04 ) 7 5 , very good loop squareness and high maximum energy product of 10.7 MGOe have been obtained. Increasing Zr content results in less uniform microstructure of annealed ribbons.
Journal of Applied Physics, 2002
In this work we examine the effect of small boron substitution (xϭ0, 0.005, 0.010, 0.015) on the structural and magnetic properties of Sm(Co 0.86Ϫx Fe 0.1 Zr 0.04 B x ) 7.5 and Sm͑Co 0.74Ϫx Fe 0.1 Cu 0.12 Zr 0.04 B x ) 7.5 melt-spun samples, as a function of wheel speed and annealing conditions. Boron substituted as-spun ribbons are found to have increased coercivity, HcϾ5 kOe, and small grain size of 60-100 nm. For copper containing samples, the highest coercivity (Hc ϭ16.3 kOe) was obtained in as-spun ribbons with xϭ0.015. In samples without copper the coercivity increased after short annealing ͑Hcϭ12 kOe for xϭ0.015͒. The large coercivities are attributed to a fine microstructure consisting mainly of hexagonal TbCu 7 -type phase and a small amount of soft-phase grains.
Magnetic Materials by Melt Spinning Method, Structural Characterization, and Numerical Modeling
New Uses of Micro and Nanomaterials
Chill block melt spinning is used in industrial processes for the production of metallic glasses. It is a rapid solidification process whereby a liquid metal is ejected at high pressure and temperature via a nozzle onto a rotating wheel solidifying in the form of a ribbon. In this work, starting from an alloy with the composition of Fe 78 Si 9 B 13 (% at.) reproduces the melt spinning technique to get the amorphous magnetic material. A CFD3D model based on the finite volume method (FVM) is proposed. For this purpose, the OpenFoam® open source code is used. In the ribbon production stage, it has been observed that the turbulence involved in the first reported transient lasts a few milliseconds, enough time to study the process with high-speed cameras. We measure the ejection speed by using optical flow on the melt contour. This enables us to check defects in the ribbons, which are predicted with the computational model, such as the case of cracks caused by irregularities in the first formation of the solid layer. The temperature measurement method relies on the fact that the digital camera is sensitive to electromagnetic radiation between 400 and 1000 nm in wavelength and the fact that the image gray level, which is proportional to the temperature T, provided the background illumination level is negligible.