JPS58224157A - Manufacture of soft magnetic co-fe alloy material - Google Patents

Abstract

PURPOSE:To obtain a soft magnetic alloy material suitable for use as the material of a non-self-retention type reed switch by melting a Co-Fe alloy having a specified composition, charging the molten alloy into central semicircular grooves cut in two opposite rolls rotating at a high speed to form an alloy wire, cold working the wire at a specified reduction rate of area, and heat-treating it at a specified temp. CONSTITUTION:A Co-10-18% Fe alloy is manufactured. The molten alloy is charged into central semicircular grooves cut in two opposite rolls rotating at a high speed such as 4,000-5,000r.p.m. to form an alloy wire having 0.5-0.7mm. diameter. The wire is cold worked at >=70% reduction rate of area by cold drawing or other method, and it is heat-treated at >=800 deg.C.

Description

Detailed Description of the Invention (1) Technical Field of the Invention The present invention relates to a method for manufacturing a soft magnetic alloy suitable for a non-self-holding type reed switch. The present invention relates to a method for manufacturing a magnetic alloy.

(2) Background of the technology Among magnetic materials, alloys with particularly high magnetic permeability are called soft magnetic materials because they are easily magnetized. l! of such a soft magnetic material with high magnetic permeability! l! When manufacturing, it is important to use high-purity materials first, and for this purpose, high-purity raw materials are used, and manufacturing methods include vacuum melting and powder metallurgy that do not contain impurities or inclusions. Then, we will try to purify it and remove distortion by #8 cooking in a hydrogen stream.

The second method is to create a texture through annealing and cold working to align the easy axes and improve magnetism.

(3) Problems with conventional technology Conventionally, 5270I (52% N 48% Fe alloy), which is one of the N1-Fe alloys (permalloy), has been used as a soft magnetic material suitable for non-self-holding type reed switches. It is used. This 5270i has an electrical resistivity of 37 to 41.
It exhibits a higher value than normal conductive materials used for μΩ sub-layers and switches. Therefore, the normally used current value is 0.
．． If it is about 5A, it will not be a problem in a lead heating stand, but if you try to make a reed switch that flows a large current of 5A or more, which is the current value required for temperature-sensitive reed switch motorronics equipment etc. in the future, the lead material itself will be large. There is a drawback that the reed switch cannot operate at all due to heat generation, or the reed switch must be made about three times as large as a normal reed switch.

(, i) Purpose of the Invention In view of the above drawbacks, the purpose of the present invention is to reduce the electrical resistivity to 15/JΩ.
・Providing a method for manufacturing a soft magnetic alloy for reed switches having a magnetic field strength of 5 or less.

Another object of the present invention is to use Nipkolloy (85%
It is an object of the present invention to provide a method for manufacturing a soft magnetic alloy for a reed switch whose coefficient of thermal expansion is almost the same as that of (-12%Fe-3%Nb).

(5) Structure of the Invention The purpose of the present invention is to produce a Co-Fe soft magnetic alloy material 4.
In the process, a Co-10~18% Fe alloy is melted and produced, and the molten metal is injected into the grooves of two opposing rolls that rotate at high speed and have a semicircular groove cut in the center, and is passed through to produce Co-Fe alloy. An alloy wire is manufactured, and then the Co-F
This is achieved by a method for producing a Co--Fe soft magnetic alloy material, which is characterized in that e-alloy wire is cold-worked to a reduction in area of 70 inches or more, and finally heat-treated at a temperature of 800° C. or more. In other words, the present invention eliminates the need for the addition of a descaling agent such as manganese or silicon during melting of the alloy in order to prevent cracking during hot working.
The Fe binary alloy is injected into a circular hole made by two opposing rolls, drawn out, and then subjected to cold working and heat treatment under predetermined conditions to obtain a Co-Fe binary alloy material.

According to the present invention, since silicon, manganese, etc. are not added, the electrical resistivity is low, and the nibcoloy (85Co-12F) is used as a material for self-holding type IJ-type switches.
A material having a coefficient of thermal expansion R approximately equal to that of e-3Nb) can be obtained.

(6) Examples of the Invention The present invention will now be described in detail by way of examples based on test results conducted by the inventor and drawings.

FIG. 1 is a graph showing the results of investigating the Fe content dependence of the coefficient of thermal expansion of a Co--Fe alloy and a Co-3% Nb--Fe alloy. Nibcoloy (85mm Co-12L%F'e -3%N) conventionally used as a reed switch
b) The thermal expansion coefficient of (point A in Figure 1)
shows the thermal tensile coefficient of the same Co--Fe alloy.The Fe peak is the case for Fe of 10 to 18 inches.However, when Fe reaches 18 inches, it becomes significantly smaller due to the change in the fine texture. Therefore, Co-
The 10-18% Fe alloy can be encapsulated in glass using the glass JKNA 8515 (manufactured by SC'FtOTT, West Germany). However, usually Co
- In the method for manufacturing Fe-based alloy materials, hot working becomes difficult unless a deoxidizing agent such as manganese or silicon is added to a consistency of 0.5%. However, such addition of manganese or silicon deteriorates the electrical resistivity of the soft magnetic material.

Figure 2 shows Co-12%Fe only and Co-12%Fe with no
．． It shows the annealing temperature dependence of electrical resistivity when 5% Mn is added. It can be seen from FIG. 2 that the addition of 0.5% manganese improves the electrical resistivity by about 20%. This tendency does not change even if Fe% is 18%.

Therefore, the present inventors developed Co-129, which has particularly low electrical resistivity.
An alloy material containing only 1rFe was molded as follows. Next, in one implementation of the present invention shown in FIG. 3, Co as starting materials of 0.176 mm and Fs of 0.02411.9 mm are charged into a high frequency furnace 1 having an inner diameter of 40 mm and an induction coil 2. Then, melting was performed and the molten metal 3 was heated by W. Next, the inlet with a diameter of 4.0 mm provided at the center of the bottom of the high frequency furnace was opened, and the molten metal 3 was dropped with nitrogen or Alden Δ 40.3 MPa, and the molten metal was cooled with water. It is guided by a roller nigeron (not shown) and rotates at a high speed of 4000 to 5000 rpm. # of opposing rolls 5a and 5b (rotation direction 7) and let it pass, Co
A 2% Fe alloy wire 6 was obtained. FIG. 4 is a schematic plan view of the opposing rolls 5a and 5b shown in FIG. A line passes through it. In this way, the Co-12%Fe composite material rapidly cooled from the liquid alloy is then subjected to conventional cold working such as cold drawing to produce an alloy wire with a wire diameter of 05 to 0.7 φ. Annealing was performed at 900°C for 1 hour. Figures 5 and 6
Co-12%Fe and Co-18%F are shown in the figure, respectively.
Figure 3 shows the shape change of the B-II curve at annealing temperatures of 700°C, 800°C, and 900°C for the e alloy.

In either case, the treatment was performed after cold working with an area reduction rate of 90 inches. As can be seen from FIGS. 5 and 6, if annealing treatment is performed at 800° C. or higher, magnetic properties that can be used as a soft magnetic alloy material for reed switches can be obtained. Figure 7 shows Co -12%Fe (+0.51Mn) and Co
Figure 7 shows the dependence of the magnetic flux density B5o (KG) on the area reduction rate during cold working at 500e for -18% Fe (+0.51Mn). From Figure 7, when the area reduction rate is 70 inches or more, the above-mentioned B11 It can be used for series reed switches of 14KG or more.

(7) Effects of the Invention 15 From the above explanation, the method according to the present invention provides a soft material for reed switches which has an electrical resistivity of 15 μΩ or less and is almost the same as nibcolloy used as a self-holding type reed switch. A magnetic alloy material can be obtained. Although the embodiments have been limited to applications for switches, it is also effective for other applications as long as it is used as a soft magnetic material.

[Brief explanation of drawings]

Figure 1 tdco-Fe alloy and Co-3% Nb-F
It is a graph showing the Fe content dependence of the coefficient of thermal expansion of @gold alloy.
FIG. 3 is a graph showing the annealing temperature dependence of electrical resistivity when 0.54 Mn is added to 12% Fe, and FIG. 3 is a schematic diagram of an embodiment showing direct alloy material extraction from a grooved opposing roll according to the present invention. FIG. 4 is a schematic plan view of the opposing roll shown in FIG. 3, and FIG. Figure 6 shows Co
-12% Fe and Co-18%Fe alloy at 700℃,
7 is a graph showing changes in the shape of the B-H curve at annealing temperatures of 900°C and 900°C, and FIG.
Magnetic flux density B at 500e and Co-18%Fe
It is a graph showing area reduction rate dependence in cold working of 5o (KG). l... High frequency furnace, 2... Rubbing coil, 3... Molten metal, 4-... N2orAr! 5 m + 5 b”
- Opposed roll, 6... Alloy wire, 7... Roll rotation direction, 8... Hole. Patent Applicant Fujitsu Limited Patent Application Agent Patent Attorney Akira Ikuki Patent Attorney Kazuyuki Nishidate 1) Yukio Patent Attorney Akiyuki Yamaguchi 1Y! ! J mo2YgI

Claims (1)

[Claims] 1. In a method for producing a Co-νi soft magnetic alloy material; Co-10 to 18-Fe alloy is melt-produced, and the molten metal is applied to the cores of two high-speed rotating opposing rolls with semicircular grooves carved in the center. Co-Fe is injected into the groove and passed through.
An alloy wire is manufactured, and then the Co-Fe alloy wire is reduced in area by 7.
A method for producing a Co-F@soft magnetic alloy material, which comprises performing cold working at a temperature of 0° C. or higher, and finally heat treating at a temperature of 800° C. or higher.