Method for producing nanocomposite magnet using atomizing method
A technology for composite magnets and manufacturing methods, which is applied in the fields of nano-magnetism, semiconductor/solid-state device manufacturing, and magnetic objects, and can solve problems such as slow cooling speed of spray method, weakening of magnetic properties of nano-magnets, and weakening of phase-to-phase exchange interactions.
Inactive Publication Date: 2003-12-31
SUMITOMO SPECIAL METAL CO LTD
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Problems solved by technology
[0010] However, in α-Fe / R 2 Fe 14 In the case of B-series nanocomposite magnets, it is difficult to manufacture practical high-performance magnets by spraying
This is because the cooling rate of the spray method is slower, so that the α-Fe phase as a soft magnetic phase will be more stable than the R 2 Fe 14 Phase B is precipitated first and is easy to grow, resulting in the coarsening of the soft magnetic phase. As a result, the exchange interaction between the constituent phases is weakened, and the magnetic properties of nano-magnets are greatly weakened.
Method used
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[0072] The production method of each sample (No.1-4) having the composition shown in Table 1 is: Nd, Pr, Fe, Co, B, C, Ti, Nb with a purity of 99.5% or more are weighed in a total amount of 1 kg , Zr, Si and Cu materials, conduct gas spraying under the following conditions to produce powders with an average particle size of about 50 μm, and then classify according to particle size to obtain powders with a particle size below 63 μm.
[0073] Gas used: argon (Ar)
[0074] Gas pressure: 40kgf / cm 2 (=3.92MPa)
[0075] Spray temperature: 1400°C
[0076] Melt supply speed: 2.0 kg / min
[0077]
no
Alloy composition (atomic %)
heat treatment
temperature
(℃)
R
T
Q
Ti
M
other
Reality
apply
example
1
Nd9
Rest Fe
B12.6+C1.4
3
Nb1
-
740
2
Nd7.4
Rest Fe
B11+C2
3
Nb1
Si0.5
720
...
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Abstract
A rare-earth alloy powder is obtained by rapidly cooling a melt of an alloy by an atomization process. The alloy has a composition represented by (Fe1-mTm)100-x-y-zQxRyTizMn, where T is at least one of Co and Ni, Q is at least one of B and C, R is at least one of the rare-earth metal elements and yttrium, and M is at least one of Nb, Zr, Mo, Ta and Hf. The mole fractions x, y, z, m and n satisfy 10 at %<x<=25 at %, 6 at %<=y<10 at %, 0.1 at %<=z<=12 at %, 0<=m<=0.5, and 0 at %<=n<=10 at %, respectively. By adding Ti to the alloy, the nucleation and growth of alpha-Fe during the rapid quenching process can be minimized.
Description
technical field [0001] Nanocomposite magnet manufacturing method using spray method Background technique [0002] Nd-Fe-B iron-based rare earth magnet alloys are widely used to make sintered magnets and bonded magnets. Among these magnets, sintered magnets are produced by pulverizing magnet alloys produced by ingot casting or strip casting, and then press-molding and sintering the powder. The bonded magnet is made by rapidly cooling and solidifying the alloy melt by melt spinning, and then pulverizing the obtained quenched alloy, mixing it with resin, and molding it. Thus, since the magnet powder used in both the sintered magnet and the bonded magnet is obtained by pulverizing a magnet alloy as a raw material, a pulverization step is usually indispensable in the magnet manufacturing process. [0003] A gas spray method is known as a method for producing magnet powder without a pulverization step. In the gas spray method, the alloy melt is sprayed in an inert gas through a...
Claims
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IPC IPC(8): H01L23/12B22F9/00C22C1/04C22C38/00C22C38/12C22C38/14H01B1/22H01F1/057H01F1/058H01L21/56H01L23/31H01L23/498H01L25/065H01L25/10H01L25/11H01L25/18H05K1/09H05K3/40
CPCH01L2924/01088H01L2224/73203H05K1/095C22C38/14H01L25/065H05K2201/0382H01L2924/01066H01L2924/0105H01L2924/01041H01L2924/01049H01L2924/01025H01L2225/06541H01F1/0574H01L2924/01013H01L2924/0103H01L21/56H01L2224/1134H01L2224/73204C22C38/002H01L2924/0104H05K2203/1461B22F9/008C22C1/0441H01L2924/01033H01L2924/01078H01L2924/01073H01L2224/16225H01L2924/01015H01L2924/01046H01L23/3121H01L2924/01082H01L2225/06586H01B1/22H01L2924/01004H01L2224/83101B22F2999/00H01L2924/30105H01F1/0579H01L2924/01029H01L2924/00013H01L21/563H01L2924/01024H01L2225/0652H01L2924/01072B82Y25/00B22F9/007H01L2924/01065H01L2924/01047H01L23/49816H01L2924/01079H05K3/4069H01L25/105H05K2201/0355H01F1/058H01L25/0657H01L2225/06517C22C38/12H01L24/29C22C38/005H01L2924/01005H01L2924/01006H01L2924/0106H01L2924/01059H01L2924/01042H01L2924/01012H01L2924/0002H01L2224/13099H01L2924/3512H01L2924/00B22F1/07B22F9/08H01F1/053
Inventor 三次敏夫金清裕和广泽哲
Owner SUMITOMO SPECIAL METAL CO LTD