Anisotropic powder was prepared with precursor (NdDy)-(FeCoNbCu)-B sintered magnets by hydrogen decrepitation,desorption,and subsequent annealing treatment.The hydrogen desorption was performed in magnetic fields of 0,1,3,and 5 T.The orientation of tetragonal phase grains of the powder was evaluated from the hysteresis loops measured by extraction magnetometer.Residual hydrogen content of the powder was evaluated by thermal-magnetic analysis.The powder with Hcj,Br,and (BH)max of 1138 kA.m-1,1.029 T,and 172.5 kJ.m-3,respectively,was achieved under the condition of the magnetic field of 3 T.Magnetic properties of the powder,especially,the remanence of the powder,are enhanced upon magnetic fields,which is due to better orientation of powder particles and less residual hydrogen in the powder resulted from the magnetic field during the hydrogen desorption process.
参考文献
| [1] | Fruchart D;Miraglia S;Mollard P;Perrier de la B(a)thie R .To Make Anisotropic Nd-Fe-B Powder using Waste Sintered Nd-Fe-B Magnets by Hydrogen Decrepitation,Desorption,and Subsequent Annealing Treatment[P].Patent EP 9006-206,1990. |
| [2] | Fruchart D;Bacmann M;De Rango P;Isnard O.,Liesert S.,Miraglia S.,Obbade S.,Soubeyroux J.-L.,Tomey E.,and Wolfers P .Hydrogen in hard magnetic materials[J].Journal of Alloys and Compounds,1997,253-254(01):121. |
| [3] | Harris I.R;Noble C;Bailey T .Hydrogen decrepitation of an Nd15Fe77B8 magnetic alloy[J].Journal of the Less-Common Metals,1985,106(01):L1. |
| [4] | Zakotnik M;Harris I.R;Williams A.J .Possible methods of recycling NdFeB-type sintered magnets using the HD/degassing process[J].Journal of Alloys and Compounds,2008,450(1-2):525. |
| [5] | Pareti L;Moze O;Fruchart D;L'Heritier Ph.,and Yaouanc A .Effects of hydrogen absorption on the 3d and 4f anisotropies in RE2Fe14B (RE=Y,Nd,Ho,Tm)[J].Journal of the Less-Common Metals,1988,142:187. |
| [6] | M. Yan;L.Q. Yu;J.M. Wu .Improved magnetic properties and fracture strength of NdFeB by dehydrogenation[J].Journal of Magnetism and Magnetic Materials,2006(2):176-180. |
| [7] | Rivoirard S;Noudem J.G;De Rango P;Fruchart D.,Liesert S.,and Soubeyroux J.L.Anisotropic and coercive Nd-Fe-B powder for bonded magnets[A].Sendai,2000:347. |
| [8] | Yamaguchi M;Yamamoto I;Goto T;Miura S .Shift in the chemical equilibrium of the LaCo5-H system by strong magnetic fields[J].Physics Letters A,1989,134(8-9):504. |
| [9] | Yamamoto I;Yamaguchi M;Fujino M;Ishikawa F.,Goto T.,and Miura S .Magnetic field effects on the chemical equilibrium between metals and hydrogen[J].Physics B,1996,216(34):399. |
| [10] | De Rango P;Popa I;Rivoirard S;Fruchart D.Nitrogenation of Nd(Fe,V)12 compounds under magnetic field[A].Annecy,2004:257. |
| [11] | Liesert S;De Rango P;Soubeyroux J.L;Fruchart D.,and Perrier de ha B(a)thie R .Anisotropic and coercive HDDR Nd-Fe-B powders prepared under magnetic field[J].Journal of Magnetism and Magnetic Materials,1996,157-158:57. |
| [12] | Von Staa F;Hempel K.A;Artz H;Wang Y.,and Schneider J .On the magnetization processes of Nd-Fe-B powders prepared by HDDR[J].Journal of Magnetism and Magnetic Materials,1996,157-158:23. |
| [13] | McGuiness PJ;Fitzpatrick L;Yartys V.A;Harris I.R .Anisotropic hydrogen decrepitation and corrosion behaviour in NdFeB magnets[J].Journal of Alloys and Compounds,1994,206(02):L7. |
| [14] | Yartys V.A;Williams A.J;Knoch K.G;McGuiness P.J.,and Harris I.R .Further studies of anisotropic hydrogen decrepitation in Nd15Fe16B8 sintered magnets[J].Journal of Alloys and Compounds,1996,239:50. |
| [15] | Fruchart D;Miraglia S;De Rango P;Wolfers P .Hydrogen location in hard magnet materials:scheme,fundamental aspects,processes[J].Journal of Alloys and Compounds,2004,383:17. |
| [16] | Liesert S .An Investigation on Hydrogen Disproportionation Desorption Recrystallisation of Nd-Fe-B-Type Permanent Magnetic Materials[D].Université Joseph Fourier,Grenoble,1998. |
| [17] | Rivoirard S;Givord D;Barthem V.M.T.S;Beaugnon E.,and De miranda P.E.V.Preparation of NdFeB anisotropic alloys by ribbon crystallization under high magnetic field[A].Annecy,2004:250. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%