Nd12.3Fe81.7-xGaxB6.0 (x =0-1.8) ribbons were prepared by melt spinning at 22 m/s and subsequent annealing treatment.The influences of Ga addition and annealing conditions on the magnetic properties and microstructure of the nanocrystalline alloys were systematically investigated.After being annealed at 620℃ for 20 min,the Jr and Hci increased from 0.85 T and 582.6 kA/m for Ga-free sample to 0.97 T and 734.6 kA/m for the x =0.9 sample,respectively.The (BH)max for the x =0.9 sample increased by about 40％ from 96.3 to 135.5 kJ/m3 compared with that of the Ga-free one.The significant improvement of magnetic properties originated from the refmement of grains in the samples by introducing Ga,which led to a stronger exchange coupling between the neighboring grains in comparison with that in Ga-free samples.The microstructure and magnetic properties of the samples depended strongly on annealing parameters,while the sensitivity of microstructure to annealing conditions could be significantly suppressed by the addition of Ga element.
参考文献
| [1] | Kneller E.F.;Hawig R. .The exchange-spring magnet: a new material principle for permanent magnets[J].IEEE Transactions on Magnetics,1991(4):3588-3560. |
| [2] | Pampillo LG;Saccone FD;Sirkin HRM .Structural and magnetic properties of nanocrystalline Nd4.5Fe72Co2Cr3Al1B17.5 ribbons[J].Physica, B. Condensed Matter,2007(1):172-175. |
| [3] | Yang C.J;Park E.B;Hwang Y.S;Kim E.C .The effect of Co on the enhanced magnetic properties of Fc3B/Nd2Fe14B magnets[J].Journal of Magnetism and Magnetic Materials,2000,212:168. |
| [4] | Harland CL.;Davies HA. .Magnetic properties of melt-spun Nd-rich NdFeB alloys with Dy and Ga substitutions[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,1998(1):37-40. |
| [5] | Ahmad I;Davis H.A;Buckley R.A .Effect of Nd content on the structure and properties of melt spun Nd-rich NdFeB alloys[J].Journal of Magnetism and Magnetic Materials,1996,157-158:31. |
| [6] | L. H. Lewis;S. M. Collins;M. J. Kramer;C. C. H. Lo .Solidification, Quenching Gas and Magnetic Properties in Melt-Spun Nd_(2)Fe_(14)B[J].IEEE Transactions on Magnetics,2001(4):2486-2488. |
| [7] | Schrefl T;Fidler J;KronmüJller H .Remanence and coercivity in isotropic nanocrystalline permanent magnets[J].Physical Review B,1994,49(09):6100. |
| [8] | Skomski R;Coey J.M.D .Giant energy product in nanostructured two phase magnets[J].Physical Review B,1993,48(21):15812. |
| [9] | Schrefl T;Kronmüller H;Fidlcr J .Exchange hardening in nano-structured two phase permanent magnets[J].Journal of Magnetism and Magnetic Materials,1993,127(03):L273. |
| [10] | Wang ZC.;Zhang MC.;Qiao Y.;Zhou SZ. .High-performance alpha-Fe/Pr2Fe14B-type nanocomposite magnets produced by hot compaction under high pressure[J].Journal of Applied Physics,2000(1):591-593. |
| [11] | Li X.H;Gao Z.S;Li W;Zhang K.W Zhang J.W and Zhang X.Y .Study of the microstructure of α-Fe/Nd2Fe1,4B nanocomposites prepared by electropulsing heating amorphous NdFeCoB[J].Materials Letters,2005,59:2782. |
| [12] | Fukunaga H;Tagawa A;Nakano M .Prcparation of high-performance PrFeB/α-Fe nanocomposite magnets by direct Joule heating[J].Journal of Magnetism and Magnetic Materials,2004,272-276(z1):e1901. |
| [13] | Chen Z.M;Wu Y.Q;Kramer M.J;Smith B.R Ma B.M and Huang M.Q .A study on the role of Nb in melt spun nanocrystalline Nd Fe-B magnets[J].Journal of Magnetism and Magnetic Materials,2004,268(1 2):105. |
| [14] | Manaf A.;Zhang P.Z. .Magnetic properties and microstructural characterisation of isotropic nanocrystalline Fe-Nd-B based alloys[J].IEEE Transactions on Magnetics,1993(6):2866-2868. |
| [15] | Manaf A;Al-khafaji M;Zhang P.Z;Davis H.A Buckley R.A..and Rainforth W .Microstructure analysis of nanocrystalline Fe-Nd-B ribbons with enhanced hard magnetic proper ties[J].Journal of Magnetism and Magnetic Materials,1993,128(03):307. |
| [16] | Kanekiyo H.;Uehara M. .Microstructure and magnetic properties of high-remanence Nd/sub 5/Fe/sub 71.5/Co/sub 5/B/sub 18.5/M (M=Al, Si, Ga, Ag, Au) rapidly solidified and crystallized alloys for resin-bonded magnets[J].IEEE Transactions on Magnetics,1993(6):2863-2865. |
| [17] | Ohkubo T;Miyoshi T;Hirosawa S;Hono K .Effects of C and Ti additions on the microstructures of Nd9Fe77B14 nanocomposite magnets[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2007,449-451:435. |
| [18] | Gr(o)ssinger R;Heiss S;Hilscher G;Kirchmayr H.R Krewenka R and Weisinger G .The effect of substitutions on the hard magnetic properties of Nd-Fe-B based materials[J].Journal of Magnetism and Magnetic Materials,1989,80(01):61. |
| [19] | Ahmad I;Davis H.A;Buckley R.A .Ultra high coercivity Nd-Fe-B permanent magnet alloy with small addition of Ga[J].Materials Letters,1994,20(3-4):139. |
| [20] | Pedziwiatr A.T;Sankar S.G;Wallace W.E .The effect of Ga substitution on the magnetic properties of Nd2Fe14B,Pr2Fe14B,and PrCo5[J].Journal of Applied Physics,1988,63(08):3710. |
| [21] | Zhang WY.;Zhang SY.;Shen BG. .Large effect of Ga addition on the magnetic properties of Pr2Fe14B/alpha-Fe-type ribbons[J].Solid State Communications,2002(12):641-643. |
| [22] | Sinnecker E.H.C.P.;Tiberto P.;Baricco M.;Vinai F.;Ferrara E. .Magnetic properties of Ga substituted Nd-Fe-B composite[J].Journal of Magnetism and Magnetic Materials,1999(0):291-292. |
| [23] | Zhang S.Y;Xu H;Ni J.S;Wang H.L Bai Q and Dong Y.D .Effect of Gallium addition on magnetic properties of Nd12Fe14B-based/α-Fe nanocomposite magnets[J].Journal of Rare Earths,2007,25:74. |
| [24] | Cui BZ.;Liu W.;Zhang ZD.;Geng DY.;Zhao XG.;Liu JP.;Sellmyer DJ.;Sun XK. .Effects of Ga substitution for Fe on the structure and magnetic properties of Nd8.4Fe87.1-xGaxB4.5 (x=0-2.2) alloys prepared by mechanical alloying[J].Journal of Applied Physics,2000(9 Pt.2):5335-5337. |
| [25] | Kelly P.E.;O'Grady K. .Switching mechanisms in cobalt-phosphorus thin films[J].IEEE Transactions on Magnetics,1989(5):3881-3883. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%