JPH01205403A - Rare earth iron resin coupling type magnet - Google Patents

Abstract

PURPOSE:To contrive accomplishment of both high density and high efficiency by enhancing the liquidity of resin by a method wherein thermosetting resin is added to the magnetic powder consisting of rare earth, iron and boron and formed by using a super-quenching method, and the above-mentioned mixture is heated up when it is compression-molded. CONSTITUTION:Thermosetting resin is added to the magnetic powder, having the basic composition of rare-earth metal, iron and boron, formed by conducting a super- quenching method, the mixture is fluidized by heating and it is compression-molded. The desirable temperature of heating when the compression-molding is conducted is 30-100 deg.C. In the heating of material at the above-mentioned temperature, as the resin can be maintained at a high degree of fluidity before it is hardened, a state of high density can be achieved. The basic composition of the rare-earth magnetic powder, consisting of rare-earth, iron and boron, manufactured by a super-quenching method is 8-18%, 73-88% and 4-9% in atomic ratio respectively, the rare-earth metal is used as a single unit or as a mixture of two or more kinds of elements selected from Y, La, Ce, Pr, Sm, Nd, Eu, Gd, Tb and Dy, and part of iron can be replaced with the transition metal of one or more kinds selected from Al, Co, Nb and so forth.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a magnet powder whose basic composition is rare earth metals, iron, and boron, and which is produced by an ultra-quenching method, and which is mixed with a thermosetting resin and molded. This invention relates to high-performance rare earth and iron-based resin bonded magnets that are made highly dense by heating.

[Conventional technology]

Permanent magnets are broadly divided into Ferrite L-magnets and Alnico magnets. Rare earth magnets can be divided into three types, and the demand for rare earth magnets has increased significantly in recent years as office automation equipment and FA equipment have become smaller and more efficient.

Rare earth magnets are broadly classified into rare earth/cobalt based magnets and rare earth/iron based magnets based on their composition. Rare earth and iron magnets are 198
The magnets announced by General Motors (GM) and Sumitomo Special Metals in 2013 both have Nd, Fe, and B as their main components, but GM used an ultra-quenching method, while Sumitomo Special Metals used a sintered method. law is adopted.

In the case of the ultra-quenching method, ribbons with a thickness of about 20 μm are obtained, each of which is composed of crystal grains of submicron size (01 to 0.5 μm), which are finer than the critical radius of a single magnetic domain particle. has been done. Therefore, it can be used as a raw material for resin-bonded magnets because it maintains a coercive force even if it is crushed into a bulk powder of 177 μrn or less. Magnets made by using the above raw materials and adding thermosetting resin were obtained in desired shapes by compression molding.

[Problem to be solved by the invention]

However, simply compression molding a mixture of magnet powder and thermosetting resin has the problem that the gaps between the powders do not become small and high density cannot be obtained. Also, by adding a small amount of lubricant, the powders will slide together and it is possible to increase the density slightly by about 3 to 5%, and if the amount of lubricant added is large, the strength of the magnet will decrease. Oops.

Therefore, in order to solve these conventional problems, the present invention aims to increase the fluidity of the resin by heating it during compression molding, thereby increasing the density and performance.

[Failure to solve the problem]

In order to solve the second problem, the rare earth/iron resin bonded magnet of the present invention has a basic composition of rare earth, iron, and boron, and a thermosetting resin is added to the magnet powder made by an ultra-quenching method. It is characterized by being heated during compression molding to increase the density.

In the present invention, the degree of heating during compression molding is 100%
It is as follows. When heating at temperatures above 30°C and 100°C, it is possible to maintain high fluidity before the resin hardens, making it possible to increase the density.
When heated for 1 hour, many parts of the resin had begun to harden, resulting in adhesion to the molding die and insufficient density, resulting in hardening. Furthermore, heating at 30° C. or lower does not increase the fluidity of the resin and is therefore ineffective.

In addition, as a rare earth magnet powder manufactured by an ultra-quenching method whose basic composition is rare earth, iron, and boron, the atomic ratio is 8.
-18%, 73-88%, -1-9%, and the rare earth metals are Y, La Ce, Pr, Srn, Nd
, , E u , G d , T b , DV
, a single substance or a mixture of two or more types, and a part of iron as A, O
.

〔Example〕

(Example 1) After pulverizing the powder obtained by the ultra-quenching method with an atomic ratio of N + 114F e soB 6 to 177 μm or less,
Epoxy resin was added and compression molded while heating at various temperatures. This is done as post l-cure treatment at 150
The magnet was thermally cured by holding it at °C for 1 hour to obtain a magnet. The magnetic performance and density of this magnet are shown in Table 1. Magnetic performance measurements were performed at 22°C in a magnetic field of 25 KOe.

Table 1 From Table 1, it can be seen that the magnets formed at a heating temperature of 100°C or less for Sample 1-6 have high performance when the heating temperature is 22°C for Sample 1-6.
It was proven that high density was obtained. Furthermore, when sample 7 was heated to 120°C, the performance was low.

(Example 2) A powder obtained by an ultra-quenching method with an atomic ratio of N d 14 F e 76 COs B 5 was pulverized to 177 μm or less, then epoxy resin was added, compression molded under heating, and then thermoset to form a magnet. I got it. Table 2 shows the performance of this magnet.

Table 2 From Table 2, samples N012-15 at 30°C-]00°
It has been proven that a high performance magnet can be obtained when heated in the C range.

〔Effect of the invention〕

As described above, in the present invention, since the rare earth resin bonded magnet is heated during molding, a magnet with higher density and higher performance can be obtained, and even when used in motors, speaker sensors, etc. It has the effect of improving performance.

that's all Applicant: Seiko Epson Corporation

Claims (2)

[Claims] (1) A magnet whose basic composition consists of rare earth metals, iron, and boron, and which is made by adding a thermosetting resin to magnet powder made by an ultra-quenching method and compression molding it, and which is characterized by being heated during molding. Resin bonded magnet. (2) The rare earth/iron resin bonded magnet according to item 1, wherein a part of the iron is replaced with a transition metal other than iron, such as cobalt.