JPS62149844A - Amorphous magnetostriction material - Google Patents

Abstract

PURPOSE:To develop an amorphous material for applying magnetostriction which is improved in cold rolling property and corrosion resistance and has no material brittleness by using Fe, Ni, Co and Cr as basic components and incorporating a specific ratio of a metalloid element such as Si, B, P or C therein. CONSTITUTION:This amorphous magnetostriction material contains the metals such as Fe, Ni, Co and Cr as the basic components as shown in formula [I], contains (y) which is 1 or >=2 kinds of the metalloid element M such as Si, B, P, and C and (z) which is 1 or >=2 kinds of the element M' such as Mg, Ca and Zn in the quantity ratio 10<=y+z<=38, 0<=z<=8 and has the quantity relations 0.03-p<=0.3, 0<=q<=0.2, 0.05<=x<=10 in the atomic ratio compsn. of p, q, x indicating the contents of Fe, Co, Ni, and Cr. Such amorphous material has a large coefft. of electromechanical coupling, permits easy formation to a thin sheet by rolling in order to improve the high-frequency characteristic, is highly resistant to corrosion and has no material brittleness.

Description

[Detailed description of the invention] The present invention relates to an amorphous material for magnetostrictive applications.

Conventionally, for this type of application, nickel, 13% 8β iron alloy,
Various ferrites have been put into practical use, but although they all have relatively large values of magnetostriction λ, they have a practical problem in terms of electromechanical coupling coefficient, which indicates the conversion efficiency of converting electrical energy into mechanical energy. teeth,
The actual situation is that it is only about 0.4 at most, and there are various problems such as poor energy efficiency and heat generation.

In other words, 13 as the most commonly used metal material.
%8β to Fe alloys have the major disadvantage that cold rolling for thinning them is quite difficult and corrosion resistance is extremely poor. On the other hand, ferrite-based materials having a relatively large electromechanical coupling coefficient have a major disadvantage in that they are extremely susceptible to cracking when used as magnetostrictive elements due to their brittle nature.

The present invention provides a new material that eliminates these drawbacks of conventional materials.

In other words, the material of the present invention not only has a larger electromechanical coupling coefficient than conventional materials, but it is also extremely easy to make into a thin plate, which is necessary to improve high frequency characteristics, and is a metal material that has excellent corrosion resistance.

In addition, the material itself has excellent toughness, and a major feature is that it does not suffer from defects such as cracks and chips that occur with ferrite.

The present invention basically consists of metal elements including Fe, Nt, Co and Cr, and metalloid elements such as St, B,
It is made of an amorphous alloy containing one or more selected from P and C.

Cr is an essential component to become amorphous and significantly improve corrosion resistance, and in the case of the present alloy, this amount is 0.05 at%.
Below that, the effect is small, but above that, the more the better.

However, if it exceeds 10 atomic %, the effect on the electromechanical coupling coefficient becomes large, so this should be reduced, so 0.05% or more,
It is preferably 10% or less (in terms of atomic ratio, the same applies hereinafter).

In addition, so-called metalloid elements such as P, Si,
The reason why the content of B and C is limited to 10% or more and 38% or less is that if it is outside this range, it becomes substantially difficult to obtain an amorphous material, and therefore the electromechanical coupling coefficient becomes significantly small. This is because only a brittle material can be obtained, making it impractical.

The reason why the relative amounts of Fe, Ni and Co are limited as in the claims is as shown in Figure 1.
This is because it has a large K when it is over 40%, and among these, when both Ni and Co are about 30% or less, the K value is over 0.65, which is superior to conventional materials. Because there is.

As shown in Figure 1, the value of p, which indicates the Ni content, is 0.
．． 03 or more and 0.3 or less, and q indicating Co content
When the value of is 0.2 or less, a particularly large value can be obtained.

The dependence of the K value on the relative amounts of Fe, Ni, and Co does not change with the addition of Cr.

The present invention will be explained below based on examples.

Example 1 (Fe, -, -+1 NipCOq) too-x-y-
p at zcrxMyM' z.

Materials with different q, x, and y (z=0) were melted to produce amorphous alloys by the so-called single roll method, and their properties were investigated, and the results shown in Table 1 were obtained. Regarding corrosion resistance, the corrosion loss of the test piece was measured after being immersed in hydrochloric acid with a concentration of 20% for 24 hours, and those with a corrosion loss of 0.04 wt% or less were considered to be extremely excellent (◎), and those with a corrosion loss of 0.05 to Those containing 0.1 wt% were evaluated as excellent (0). Regarding toughness, those with a breaking strength of 350 or more (kg/am") are considered to be extremely excellent (◎), and those with a breaking strength of 300 or more are considered to be 350 or more.
Those with a score of less than 100% were considered excellent (0). The corrosion resistance and toughness are indicated by markedly excellent (◎) and excellent (◎).

To measure K, place a long sample into a coil,
When an excitation alternating current is passed through the coil, the resulting alternating magnetic field is felt, and the sample expands and contracts due to the magnetostrictive effect, creating a vibrating state.

At this time, when the absolute value of the impedance at both ends of the coil is measured by changing the frequency of the excitation current, a peak and a reduction occur as the frequency increases.

In this case, the frequency fR at which the impedance peak occurs is called the resonant frequency, and the frequency tf at which the impedance is minimum is called the anti-resonant frequency, and the electromechanical coupling coefficient is given by the following equation.

Table 1 As is clear from the results in Table 1, the addition of Cr significantly improves the corrosion resistance and toughness of the alloy, and also shows that it has a large electromechanical coupling coefficient.

In the alloy of the present invention, by containing one or more of Mg, Ca, and Zn within a range not exceeding 8%, heat treatment for increasing the electromechanical coupling coefficient K is facilitated, and the frequency dependence of K and Bias magnetic field dependence is improved. However, if these amounts exceed 8%, K will deteriorate, making it impractical.

Samples IIkL12-14 and IIkL16 are shown in Tables 2 and 3.
-18 shows the composition of an example alloy of the present invention to which Ca, Mg and Zn are added.

Table 2, Figures 2 and 3 show heat treatment temperatures (annealtem
The relationship between p) and the obtained value is shown. As shown in FIGS. 2 and 3, the addition of Mg, Ca, or Zn widens the range of heat treatment temperatures needed to obtain a high value, making the heat treatment easier.

Table 4 shows examples of the dependence of the value on the bias magnetic field (Hb) for alloys of samples Na11 and No12. Table 4 shows the ΔH, (Os), including those of other alloy compositions, assuming that the width of the distribution curve for the peak K value of 273 is ΔHb. Ca, Mg or Zn
It is shown that the addition of ΔH5 increases the ΔH5 value and improves the bias magnetic field dependence of the K value.

Table 4 Amorphous in the present invention refers to a situation in which no obvious Debye-Schuller ring is observed by macroscopic X-ray diffraction, and there is no problem in practical use.

[Brief explanation of drawings]

FIG. 1 shows (Fet-p-qNipcOq), scr
*Fe, Ni, Co in si+oB+z system
Curve diagrams showing the relationship between the relative amount of and K, Figures 2 and 3
Figure 4 shows the dependence of K value on heat treatment temperature.
The figure is a diagram showing the bias magnetic field dependence of the K value.゛\-1/ Figure 1 N1 Figure 2 Anneal temp ('c) Figure 3 Anneal temp ('c) Figure 4 Hb (○e)

Claims (1)

[Claims] 1. The atomic ratio composition is (Fe_1_-_p_-_qNi_pCO_q)_1_
0_0_-_x_-_y_-_zCr_xM_yM'_
zHowever, M: one or more combinations selected from Si, B, P, and C M': one or more combinations selected from Mg, Ca, and Zn 0.03≦ An amorphous magnetostrictive material characterized in that p≦0.3, 0≦q≦0.2, 0.05≦x≦10, 10≦y+z≦38, and 0<z≦8.