JPS62260034A - Permanent magnet - Google Patents

Abstract

PURPOSE:To obtain an easily magnetizable permanent magnet by substituting specific amounts of Ti for a part of Co in an alloy consisting of R-Co-Fe-Cu-Zr composed mainly of RCo17 intermetallic compound so as to reduce demagnetizing characteristic iHe. CONSTITUTION:The alloy has a composition consisting of, by weight, 26% of, e.g., Sm as rare earth element, 15% Fe, 5% Cu, 2.5% Zr, and the balance Co. Moreover, in the above composition, 0.1-0.5% Ti is substituted for a part of Co. This alloy is melted and the resulting magnetic alloy is pulverized, which is subjected to parallel magnetic field compacting in a magnetic field and the resulting green compact is sintered and then subjected to solution heat treatment to be formed into a permanent magnet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to the composition of RCo 2 -based intermetallic compounds.

[Conventional technology]

Conventionally, the alloy system consists of R-Co-Fe-Cu-Zr.

It is known that excellent air output characteristics are obtained. Here, R is a rare earth metal element, but because it has a "point" in the second quadrant of the demagnetization curve, it has the disadvantage that it cannot be used at a low operating point.Also, even in the conventional composition, heat treatment By choosing the conditions.

Although it is possible to lower the "point" and use it at a lower operating point, it has the disadvantage that the iHc of the demagnetizing characteristic is large, making it difficult to magnetize.

[Purpose of the invention]

The invention is to eliminate these drawbacks and reduce the demagnetization curve to the second quadrant.
By lowering the "kunigu point", it can be used at a lower operating point,
Another object of the present invention is to provide a permanent magnet that has a small demagnetization characteristic iHc and is easy to magnetize.

[Structure of the invention]

The present invention is directed to + RCo17 based metal compounds.
In an alloy consisting of Co-Fe-Cu-Zr, C
This is a permanent magnet in which a part of o is replaced with O,] to 0.5 wt% of Ti.

[Effect]

It has good magnetization KL and can be used even at a low operating point.

<Example 1> Composition 26wt%Sm, 15wt%FeI5w
t%Cu.

2.5 wt% Zr, balance Co alloy and 0 co
．． An alloy in which 1,0.3°0.5,0.7 wt% was replaced with Ti was melted, and the resulting magnetic alloy had an average grain size of 4μ.
The material was pulverized to 500 ml of powder, subjected to Soles molding in a 10 KOe magnetic field, sintered at 1215°C for 2 hours, and then solution treated at 1200°C for 5 hours.

Then, as aging treatment, after 780°C x 10H, 10'C/m
After slow cooling to 40° C., rapid cooling was performed. The magnetic properties of the obtained magnet are shown in Figure 1.

As shown in Figure 1, by substituting a part of Co with Ti, the demagnetization characteristic gHc increases up to a certain amount.

At 0.6% or more, the Ti substitution has no effect and on the contrary decreases.

An example of the B-H curve is shown in Fig. 2, and the evaluation of the ``nikk point'' indicates that the larger the BHc, the better.Therefore, when the Ti content is 0.3 wt%, However, it can be seen that the BHc is the highest and the ``kuniku point'' is low.

<Example 2> The solution-treated magnet obtained in Example 1 was subjected to aging treatment under different aging conditions. As aging treatment, 820℃×
After 10 hours, slowly cooled to 400°C at 10°C/min,
Rapid cooling was performed. Figure 3 shows the maternal characteristics of the obtained magnet. As can be seen from FIG. 3, from Example 1, overall BH
A high c value can be obtained, and by replacing Ti, the iHc value can be kept low even if the BHc is increased. This iH
The importance of c is explained in Figure 4. For 100% anchoring, a small iHc can be achieved with a low magnetizing field (, i
A material with a large Hc requires a high magnetizing magnetic field. It may be impossible to increase the calming base field in one turn of magnetization.

It is possible to achieve 100% magnetization with the smallest possible magnetizing magnetic field.

It is important to get a good 3 stones.

〔effect〕

As described above, according to the present invention, a part of Co is replaced by T
By replacing it with i, the "<nikku point" is lowered.

Moreover, R2C can be used at a low operating point that is easy to magnetize.
A 017 series permanent magnet can be obtained.

Margin below

[Brief explanation of drawings]

Figure 1 shows BHc versus Ti content in Example 1.
Regarding the characteristics, FIG. 2 shows a relationship diagram between the "kuniku point" and BHc. Figure 3 shows 1 for the Ti content in Example 2.
) (A characteristic diagram of c and nHc, and Figure 4 also shows a diagram of the relationship between the magnetizing magnetic field and the magnetization rate. 11th

Claims (1)

[Claims] 1. R_2 (R is a rare earth metal) An alloy consisting of R-Co-Fe-Cu-Zr mainly composed of Co_1_7 intermetallic compounds, characterized by replacing Co with 0.1 to 0.5 wt% of Ti. Permanent magnetic alloy.