JPH097812A - Rare earth element bond magnet and its manufacturing method - Google Patents

Abstract

PURPOSE: To provide a practical bond magnet having higher iHc than conventional one by a method wherein (Fe, Co) 3 (B, C) phase in high magnetic anisotropy is specified to be the main phase by adding Co and C in an ultra rapidly quenched bond magnet assuming Fe3B phase as a main phase. CONSTITUTION: The title rare earth element bond magnet is represented by the composition of RaFebCocBdCeADf (where R represents at least one kind of rare earth elements including Nd, Pr, Ce, Dy; AD at least one kind out of Al, Zn, Cu, Ga, while 5<=a<=30wt.%; b: the balance %; 12<=c<=70wt.%, 2<=d+e<=6wt.%, f<=5wt.%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rotating equipment, electronic parts,
The present invention relates to a rare earth permanent magnet used in electronic devices and the like.

[0002]

2. Description of the Related Art Nd-Fe- produced by an ultra-quenching method
The B-type bonded magnet has a maximum energy product of approximately 5-12 MGOe, but it is a spindle that drives hard disks and floppy disks of computers because it can be made into a small thin product and has good magnetization and thermal stability. It has come to be widely used in motors and the like. It is expected that this rare earth bonded magnet will be applied not only to computers but also to automobile electric motors and the like in the future.

[0003]

The rare-earth bonded magnet produced by the ultraquenching method is a magnet that is easy to use, but it has the drawback of low Br. To improve this point, F
Bonded magnets whose main phase is e3B (USP 4,810,3
09), a bond magnet having α-Fe as a main phase (Japanese Patent Laid-Open No. 7-
54106) has been proposed. But,
Although these bonded magnets can obtain high Br, their iHc and (BH) max are low, so that they are not practically used at present.

[0004]

In the present invention, the above Fe3 is used.
The bond magnet having B as the main phase generates R i because it generates iHc.
Although iHc is generated by forming 2TM14B phase, high magnetic anisotropy of Fe3B cannot be obtained. Therefore, in this study, in order to improve the defect that iHc is low, (Fe, Co) 3 having higher magnetic anisotropy than Fe 3 B is used.
In order to obtain a high coercive force even with a composition containing (B, C) as the main phase and Co, the improvement of the magnetic characteristics was examined by forming the R2TM14B phase containing Pr as the main component. As a result, it was found that iHc higher than that having Fe3B as the main phase was obtained. Although B may be added alone, it has been found that when R2TM14B phase is formed by adding C together, it is effective in improving iHc, and when a small amount of Zn, Cu, Ga is added, higher coercive force is obtained. As a result, a bonded magnet having both high magnetic flux density and high coercive force was obtained. The present invention has been found based on the above findings, and the composition formula RaFebCocBdCeADf (where R is Nd, Pr,
At least one of rare earth elements including Ce and Dy, A
D is at least one of Al, Zn, Cu and Ga, 5
≦ a ≦ 30 wt%, b: balance, 12 ≦ c ≦ 70 wt
%, 2 ≦ d + e ≦ 6 wt%, f ≦ 5 wt%). The present invention also provides a composition formula RaFebCocBdCeADfMg (where R is Nd,
At least one of rare earth elements including Pr, Ce, Dy
Species, AD is at least 1 of Al, Zn, Cu, Ga
Species, M is Ti, V, Cr, Zr, Nb, Mo, Hf, T
at least one of a and W, 5 ≦ a ≦ 30 wt%, b:
Remainder, 12 ≦ c ≦ 70 wt%, 2 ≦ d + e ≦ 6 wt
%, F ≦ 5 wt%, g ≦ 10 wt%) is a rare earth bonded magnet containing an alloy represented by the composition. Further, the present invention provides a composition formula RaFebCocBdCe (where R is N
At least one of rare earth elements containing d, Pr, Ce, Dy, AD is at least one of Al, Zn, Cu, Ga, 5 ≦ a ≦ 30 wt%, b: balance, 12 ≦ c ≦ 7
It is a rare earth bonded magnet having a composition of 0 wt%, 2 ≦ d + e ≦ 6 wt%).

In the present invention, the rare earth element R is contained in the range of 5 wt% or more and 30 wt% or less. When the content is 5 wt% or less, iHc is small, and when the content is 30 wt% or more, Br decreases.

Co is effective in improving the magnetic anisotropy of the (Fe, Co) 3 (B, C) phase, and is 12-70 wt.
It is contained in the range of%. The composition ratio of Fe and Co is 28 ≦ F
The range of e / Fe + Co ≦ 74 wt% is preferable.

B and / or C are (Fe, Co) 3
It is an element necessary for forming the (B, C) phase and the R2TM14B phase, and is contained in the range of 2≤d + e≤6 wt%. 2w
If it is less than t%, the (Fe, Co) 3 (B, C) phase is not formed, and if it exceeds 6 wt%, Br becomes small.

AD (Al, Zn, Cu, Ga) is an element for improving the coercive force and is contained in the range of f≤5 wt%. If it exceeds 5 wt%, Br is lowered, which is not preferable.
M (Ti, V, Cr, Zr, Nb, Mo, Hf, Ta,
W) has the effect of suppressing the growth of the (Fe, Co) 3 (B, C) phase, but if it is added in excess of 10 wt%, Br decreases, which is not preferable. It is more preferable to add 5 wt% or less.

Next, a method for manufacturing the magnet of the present invention will be described. After alloying each element, the flakes ultra-quenched at a roll peripheral speed of 10-70 m / s are heat-treated at 400-1000 ° C. This is crushed to a size of 500 μm or less using a brown mill, bantam mill, etc., mixed with resin, curing agent, lubricant, etc., kneaded with a kneader, Henschel mixer, etc., and cured in the range of 100-200 ° C. to obtain a bond magnet. And

[0010]

EXAMPLES The present invention will be described in detail below with reference to examples. (Example 1) The alloys shown in Table 1 were produced by the ultraquenching method. The roll peripheral speed was 35 m / s. 600 ° C
After heat treatment for × 1 h, it was ground to 200 μm or less. Epoxy resin, curing agent and lubricant were added to the obtained powder, and the mixture was kneaded and then molded at a molding pressure of 6 t / cm 2 for 150
It was cured at ℃, to obtain a rare earth bonded magnet. The magnetic properties of the obtained rare earth bonded magnet are evaluated and shown in Table 1.

[0011]

[Table 1] When the bonded magnet obtained by the present invention is compared with the bonded magnet having Fe3B as the main phase, it is found that obviously high magnetic characteristics are obtained.

Example 2 The alloys shown in Table 2 were prepared by the ultra-quenching method. The roll peripheral speed was 60 m / s. A compound for a bonded magnet was prepared in the same manner as in Example 1 and molded under a pressure of 8 t / cm 2. This was also cured at 150 ° C. and magnetic properties were measured. Table 2 shows the obtained results.

[0013]

[Table 2]

[0014]

EFFECT OF THE INVENTION In a bonded magnet having Fe3B as a main phase and Nd2Fe14B phase as a sub-phase, by further adding Co and C, (Fe, Co) 3 (B,
R2T mainly composed of Pr instead of Nd.
By forming the M14B phase, an excellent bonded magnet material having high Br and high iHc was found.

Claims (5)

[Claims] 1. RaFebCocBdCeADf (where R
Is at least one of rare earth elements containing Nd, Pr, Ce, Dy, AD is at least one of Al, Zn, Cu, Ga, 5 ≦ a ≦ 30 wt%, b: balance, 12 ≦ c
≦ 70 wt%, 2 ≦ d + e ≦ 6 wt%, f ≦ 5 wt
%) Containing an alloy represented by the following composition: rare earth bonded magnet. 2. RaFebCocBdCeADfMg (wherein R is at least one of rare earth elements including Nd, Pr, Ce and Dy, AD is at least one of Al, Zn, Cu and Ga, M is Ti, V, Cr, Zr, Nb,
At least one of Mo, Hf, Ta and W, 5 ≦ a ≦ 3
0 wt%, b: balance, 12 ≦ c ≦ 70 wt%, 2 ≦ d
+ E ≦ 6 wt%, f ≦ 5 wt%, g ≦ 10 wt%) A rare earth bonded magnet characterized by containing an alloy represented by the composition. 3. RaFebCocBdCe (where R is N
At least one of rare earth elements containing d, Pr, Ce, Dy, AD is at least one of Al, Zn, Cu, Ga, 5 ≦ a ≦ 30 wt%, b: balance, 12 ≦ c ≦ 7
0 wt%, 2≤d + e≤6 wt%) is contained in the rare-earth bonded magnet. 4. The alloy has a structure in which a (Fe, Co) 3 (B, C) phase and an R2TM14B phase are mixed.
A rare earth bonded magnet according to any one of the above. 5. RaFebCoc produced by ultra-quenching method
BdCeADf (where R is at least one of rare earth elements including Nd, Pr, Ce, Dy, AD is Al, Z
At least one of n, Cu and Ga, 5 ≦ a ≦ 30w
t%, b: balance, 12 ≦ c ≦ 70 wt%, 2 ≦ d + e
≦ 6 wt%, f ≦ 5 wt%), a method of manufacturing a rare earth bonded magnet, which comprises mixing an alloy represented by a composition of f ≦ 5 wt%) with a resin, followed by hardening.