hoa.
KET LUAN
Sau mot thdi gian thuc hien dk tai, chiing toi da thu dugc mot s6 kk
qua nhu sau:
- Da xay dung va van hanh t6t he thiSt bj hip thu khi hydro trong nhiet do
cao (he thiet bi HDDR).
- Su dung he thiat bi HDDR xay dung dugc dk khao sat cac hgp kim va
cac dieu kien cdng nghe trong quy trinh HDDR va da che tao thanh cdng ca hai loai hot HDDR khdng di hudng va di hudng.
- Mot quy trinh nhiet vdi nhiet do cao hon va thdi gian dai hon da dugc lira chon thich hgp cho cac vat lieu cd pha tap mot lugng nhd Zr (0.1% Zr).
f f f
- Ket qua la da che tao dugc nam cham ket dinh tren co sd hot hgp kim Nd|6Fe75 9Zro.iB8 di hudng ch6 tao bang phuong phap HDDR dat tich nang lugng cue dai (BH)max = 9.95 MGOe.
Tai lieu tham khao
Tieng Viet
1. Luu Tuin Tai (2005), Gido trinh Vat lieu Tie cung. 2. Vu Dinh Cu (1995), Tir hoc
3. Luu Tuan Tai (2005), "Nghien cuu ch6 tao nam cham kk dinh bang
cong nghe HDDR", Bao cao hoi nghi Vat ly toan qu6c Idn thii VI, Ha noi 23 - 25/11/2005.
Tieng Anh
4. LR. Harris, O.M. Ragg and CL. Short, "The HD and HDDR processes - fundamentals and applications" B15 2TT. UK.
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6. O. Gutfleisch, D. Eckert, R Schafer, K.H. Muller and V. Panchanathan (2000), "Magnetization processes in two different types of anisotropic, fiilly dense NdFeB hydrogenation, disproportionation, desorption and recombination magnets", Journal of Applied Physics 87 (2000) 6119- 6121.
-7. Gutfleisch, O.; Gebel, B.; Kubis, M; Muller, K.H.; Schultz, L. (1999); "Modified HDDR procedures applied to NdFeB alloys"; Magnetics, IEEE Transaction on 35 (1999) 3250-3252.
8. C. Burkhardt, M. Matzinger, M. Steinhorst, J. Fidler, I.R. Harris (1997), "HDDR processing of direct-reduced NdnFeyy.^gGax powders", Joumal of Magnetism and Magnetic Materials 169 (1997) 69-81.
9. W. Chen, R.W. Gao, M.G. Zhu, W. Pan, W. Lie, X.M. Lie, G.B. Han, W.C. Feng, B. Wang (2003), "Magnetic properties and coercivity mechanism of isotropic HDDR NdFeB bonded magnets with Co and Dy addition", Joumal of Magnetism and Magnetic Materials 261 (2003)222-227. * *
10. E Estevez, J Fidler, C Short and I R Harris (1996), "Microstructural study of hot pressed HDDR Nd-Fe-B magnets", J. Phys. D: Appl. Phys. 29(1996)951-956.
11. M. Matzinger, J. Fedler, A. Fujita, I.R. Harris (1996), "Microstructure of solid - HDDR Nd-Fe-B: Zr magnets", Joumal of Magnetism and Magnetic Materials 157/158 (1996) 54-56.
12. S.J. Collocott, J.B. Dunlop, H.C. Lovatt and V.S. Ramsden (2007), "Rare -earth permanent magnets: new magnets materials and applications". School of Electrical Engineering, University of Technology, Sydney, NSW, Australia 2007.
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