JPS58157938A - Permanent magnet alloy - Google Patents

Abstract

PURPOSE:To obtain a permanent magnet alloy having increased and stabilized coercive force by substituting Mn for a specified amount of Fe in an alloy consisting of specified percentages of a rare earth metal, Co, Cu, Zr, Zn and Fe. CONSTITUTION:A permanent magnet alloy is obtd. by substituting Mn for 8- 10wt% Fe in a blended composition consisting of, by weight, 22-28% R (R is 1 or >=2 kinds of rare earth metals such as Sm and Ce), 36-58% Co, 8-12% Cu, 1-3% Zr, 1-3% Zn and 10-18% Fe. Thus, superior coercive force can be provided stably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a permanent magnet alloy mainly composed of an R2C01□-based intermetallic compound (where R is a rare earth metal).

In general, the four basic elements (R, Co) are represented by permanent magnets mainly composed of R2C47 intermetallic compounds.

It is well known that a high-performance permanent magnet can be obtained by a combination of (Fa, Cu).

Further, in addition to the above four basic elements, Zr is added as a sixth element.

Additives such as Mn are often added to improve performance, and these experiments have often been carried out and put into practical use.

Their physical performance is shown in Table 1.

Table 1 As is clear from Table 1 above, conventional permanent magnet alloys were developed with emphasis on increasing the saturation magnetic flux density (Br)i in order to obtain higher performance, so the coercive force (Ha) was This is a fairly low value.

When considering mass production, this is almost impossible in terms of manufacturing.The 4πIH curve, which is representative of the characteristics of a permanent magnet, is shown in Figure 1, and the angular characteristics of this 4πtH curve are d and d according to experimental data. In comparison, mass production had the disadvantage that it deteriorated considerably as shown in b.

The object of the present invention is to eliminate the above-mentioned conventional drawbacks, and to provide a permanent magnet alloy that can increase and stabilize coercive force (Ha).

In order to achieve the above object, the present invention provides R-C.

-Fe-Cu -Zr -Zn -Mn (7) It is characterized in that the amount of Fe in the blended composition is reduced by blending seven elements.

Examples of the present invention will be described below.

26.6% am, 48.7% Co by weight.

9.4% Cu, 3.4% Fe, 8.1 lb Mn.

2.3% Zr, 1. A material consisting of e% of Zn is melted in vacuum, and a finely pulverized powder is produced using a die-nodomil pulverizer using N2 gas. This finely pulverized powder f 12 KOe is molded in a magnetic field using a mold at a pressure of 2 ton/cd.

This molded body was sintered in vacuum at a temperature of 1180°C for 60 minutes, and rapidly cooled to 800°C at a rate of 5°C/sec or more. This sample was further heat-treated at 800°C for 60 minutes in a vacuum.
Table 2 shows the magnetic properties obtained up to 200° C. at a temperature of less than ° C./min, and FIG. 2 shows the 41rIH curve. In FIG. 2, a shows experimental data and b shows mass-produced product data.

Table 2 As is clear from the results, the permanent magnet material of the present invention has a slightly lower saturation magnetic flux density (Br) than the conventional permanent magnet material, but a significantly larger coercive force (Ha). This makes it suitable for mass production and therefore B
This means that a stable Hmax can be provided.

In addition, BHmax when changing Mail.

is high and the coercive force (Ha) is low, but by increasing the amount of iron and decreasing the amount of Fe, the coercive force (Ha) is low.
An increase in Ha) was observed. However, even if the Mn1l110cm or higher, the coercive force (Ha) cannot be expected to increase much, and the BHma will increase by the amount that the saturation magnetic flux density (Br) will decrease.
Since the value of x decreases, an effective amount of Mn to replace Fe is 8 to 10 wt%.

Since the permanent magnet material of the present invention is constructed as described above, it is possible to stably obtain an excellent coercive force, and it is suitable for mass production, and is of great industrial value.

[Brief explanation of drawings]

Figure 1 is a characteristic diagram showing the 4πxH curve of a conventional permanent magnet material, and Figure 2 is a 4πxH curve of an example of the permanent magnet material of the present invention.
Characteristic diagrams showing IH curves, Figures 3 to 6 show BHmaw, Br, lHc with respect to the amount of Mn added according to the present invention.
It is a characteristic diagram. Name of agent: Patent attorney Toshio Nakao #1 or 1 person 1
Figure 111 - Ht (ag) Figure 2 JRC (Ie)

Claims (1)

[Claims] 22 to 28% R by weight (however, B is one or a combination of two or more rare earth metals, mainly Sm and G), 36 to 58% Co, 8 to 12% by weight. %α. 1-3% Zr, 1-s% Zn and 10-18
1. A permanent magnet alloy, characterized in that Fe1a is substituted with 10% Mn.