JPS58209103A - Manufacture of soft magnetic material - Google Patents

Abstract

PURPOSE:To obtain a soft magnetic material, by a method wherein an ingot formed by adding Mn or Mn and a misch metal, as a deoxidizer, to a Co-10- 18% Fe alloy is subjected to hot and cold working, followed by process annealing, and is then subjected to cold working at a specific reduction of area and heat-treated. CONSTITUTION:As a deoxidizer, not exceeding 0.5wt% Mn or a mixture of not exceeding 0.3wt% Mn and a misch metal (45<Ce<55, 25<La<35, 10<Nd<20, 2<Pr<10) is added to a molten Co-10-18% Fe alloy to form an ingot improved in hot workability and reduced in electric resistance. The ingot is successively subjected to hot and cold working and process annealing and is then subjected to cold working at a final reduction of area of not less than 70% before being heat-treated at a temperature not lower than 800 deg.C. This constitution makes it possible to obtain a soft magnetic alloy substantially equal in thermal expansion coefficient to a niobcolloy (Co-3%Nb-Fe), which is a semirigid material conventionally employed for a self-maintaining reed switch.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a method of manufacturing a soft magnetic alloy suitable for a non-self-holding reed switch.

To explain in more detail, Go-Fe has low electrical resistivity.
The present invention relates to a method of manufacturing a soft magnetic alloy based on a soft magnetic alloy.

(2) Technical background What is the magnetic permeability of magnetic materials? Alloys with high magnetic properties are called soft magnetic materials because they are easily magnetized. When manufacturing such soft magnetic materials with high magnetic permeability, it is important to use high-purity materials first, and for this reason, high-purity metals are used as raw materials, and unfavorable molding methods are used. Materials and inclusions: Utilize vacuum melting or powder metallurgy that does not contain any inclusions, and annealing in a hydrogen stream to purify or remove distortion. The second method is to create a texture through annealing and cold working, and change the easy axis to improve magnetic properties.

(3) Problems with the conventional technology Conventionally, a Ni-Fe alloy (5270I (52% Ni-48% Fe alloy), which is one of the permalloy types) has been used as a soft magnetic material suitable for non-self-holding type reed switches. This 527 carp has an electrical resistivity of 37 to 4.
1μQ-Cm, which is higher than ordinary conductive materials used in switches and the like. Therefore, 0.5 of the normally used current value
In the case of A8 degrees, there is no problem with the heat generation of the lead material, but if you try to make a reed switch that flows a large current of 5 A or more, which is the current value required for temperature-sensitive lead Suinochi Mortronics equipment in the future, the lead material itself will be damaged. This has the disadvantage that the reed switch cannot operate at all due to the large amount of heat generated, and the reed switch must be made about three times as large as a normal reed switch.

(4) Purpose of the Invention In view of the above drawbacks, the purpose of the present invention is to increase the electrical resistivity to 15μΩ・
It is an object of the present invention to provide a method for producing a hard magnetic alloy for reed switches having a cWL or less.

Another object of the present invention is to use a semi-hard magnetic material called Nipcolloy (85%-
12%Fe-3%Nb) and 0 to provide a method for manufacturing a soft magnetic alloy for reed swing having a coefficient of thermal expansion in the opposite direction.

(5) Structure of the Invention The object of the present invention is to provide a method for manufacturing a soft magnetic material; melting a Co-10 to 18% Fe alloy, and immediately before casting, 0.5 or less by weight is added to the melted alloy. Mn or 0
．． Mn of 3 or less + 0.05% or less of Mitsushmetal (45<Oe<55.25<La<35.
10<Na<20゜] 2<pr<to) is added, the alloy is first cast to form an ingot, and the ingot is hot-processed.
The soft magnetic material is then subjected to cold η loe, and finally cold worked with an area reduction ratio of 70 or more after dulling, and then heat treated at a temperature of 800'C or more. This is achieved by using M method of materials.

The basic component of the above-mentioned soft magnetic material is cobalt. Therefore, the material of the present invention exhibits a face-centered cubic lattice in the four-fold state described below.

(6) Examples of the Invention The present invention will be explained below based on Examples including comparative examples.

An alloy containing Co -10 to 18% Fe and 0.5% Mn'Q as a stimulant is melted in a vacuum high frequency furnace and cast into a mold to produce an ingot. This ingot was subjected to hot working and spreading cold working, and intermediate annealing at 1100'C. After intermediate annealing, the wire rods were finally subjected to cold working at an area reduction ratio of 90, and various tests were conducted using wire rods with a diameter of 0.6 as test materials.

Post the test result data from Figure 1 to the 4th road.

Figure 1 shows the relationship between the amount of Fe and the coefficient of thermal expansion. 3
(Nb-Fe system). 0.5% from Figure 1
The coefficient of thermal expansion in a composition of CO-12% to 181Fe with an Mn addition of 0 f'' is the coefficient of thermal expansion of nibcolloy (85'% Co-3% Nb-12% Fe) containing 12% Fe. This shows that when Nipkolloy is used as a reed switch, the conventional encapsulating glass for Nipkolloy J ENA8515 (West Germany, 5C)
HOTT Co., Ltd.) can be used as the material of the present invention.

FIG. 2 shows the dependence of the annealing temperature on the electrical resistivity of the On--Fe alloy. As is clear from Figure 2, the electrical resistivity in all data is less than 15 μΩ・1, and the electrical resistance of the soft magnetic material is 37 to 41 μQ.
It is less than v2 compared to Cm.

FIG. 3 shows the dependence of the annealing temperature on the coercive force of the On-Fe alloy, and FIG. 4 shows the dependence of the annealing temperature on the magnetic flux density of the On-Fe alloy. In Figures 3 and 4, there are some references related to the present application.
-The four relationships between the magnetic properties and annealing temperature of the Co alloy are investigated. 1 Figures 3 and 4 show that the annealing temperature is 8.
Good soft magnetic properties could be obtained at temperatures above 00°C. In other words, the coercive force is less than 30e and the magnetic flux density is more than 16 KG! [showed that.

Next, 0.5 To Mn f added Go-12%F
e, 1896re alloy material was subjected to zero hot stress treatment in the same manner as described above.
The hair was then subjected to cold working and intermediate annealing at 110'O<0>C. After that, in the final cold annealing process, the area reduction rate was reduced to 50.
゜60.70,80. and 90%V) 5 types vc
Magnetic flux density '3so at 500e of z-formed sample
was measured. The minor results are shown in Figure 5. As can be seen from FIG. 5, when the area reduction rate is 70% or more, 850 becomes 14KG, and has characteristics suitable for reed switches.

Next, Co-12%FeC', Mi, Cn-12%Fe
+O-5%Mn.

Co-12%Fe + 0.25%Mn + 0.05
%, Mitsushmetal (composition Ce52%, La32%,
Nd1Q%.

In addition to Pr4%, Sm, Gd, r, fiiu, Fe
, CB, AI), My shoga is small), Go-12%
F' e + 0.34th+ +0.05%MM.

Co-12%Fe+0.4%Mn+Q,Q 5%M
Six types of alloys, M and Go7, 12% Fe + 0.7% Mn, were exploded in exactly the same manner as described above, and the annealing temperature and three-dimensional resistance were measured. So-D result y! ! : Shown in No. 61.

From Figure 6, it can be seen that:

(a) The sample with only the Co-12L4Fe composition has the lowest electrical resistivity of 10μQ'Cm.

(b) 0.5%M as a deoxidizer in Co-12%Fe
When n or 0.7% Mn is added, 'n12~13 respectively.
μΩ'Cm+approximately 14 μΩ·CmK Although the electrical resistivity increases, it is approximately worse than the electrical resistivity of the conventional 5270I.

(c) co-12%Fe each 0.254 Mn,
Or add 0.3% Mn or O-4% Mn and then add
When 0.05% MM was added to the sample, a low electrical resistivity of less than 13 μQ-cWLIJ was obtained.

B) Oo-12Fe alloys containing manganese or mino/yumetal as deoxidizers were easy to hot work and cold work. However, in the case of the sample containing only Co-12%Fe, cracking occurred during the process of sequential hot JD processing of the ingot. In the case of Co-12%Fe" 0.7fy Mn, it was possible to process without producing "1Ilf"L, but in the 6th
``arv As shown, the electrical resistivity 9 has increased.

From the above experimental results, which are favorable for the first implementation, a good Ct)-Fe
It can be seen that the following points are important in the molding of soft-grade alloys.

(b) Some kind of deoxidizing agent is required.

(b) Since the addition of Mn'z as a deoxidizing agent increases the electrical resistance, it is better to add as little as possible. Mn 0.5%
Below are 11! A content of 0.3 to 0.5% is preferable from the viewpoint of hot workability and electrical resistance.

(c) 0.3% or less of Mn and 0.3% or less of miso metal.
05% or less, especially Mn 0.2 to 0.3% and Mino 7, -
When 0.03 to 0.05% of metal is added, an alloy with good hot workability and low electrical resistance can be obtained.

(b) Good magnetic properties for reed switches were obtained when the area reduction rate was 70% or more in the final cold working (cold drawing) and the final heat treatment temperature was 800° C. or more.

(7) Effects of the invention From the above explanation, it is said that the electric resistance is 15 μQ.
It is possible to obtain a soft magnetic material that has the same thermal expansion coefficient as nibcolloy, which is a semi-hard magnetic material conventionally used as a reed switch.

[Brief explanation of the drawing]

0n-10 to 18th FC from the 1st side to the 41st side.
Regarding the alloy containing 51Mn'i, the dependence of the thermal expansion coefficient on the Fe strand, the dependence of the electrical resistance on the annealing temperature, the dependence of the coercive force on the annealing temperature, and the magnetic flux density. In the graph showing annealing temperature dependence, dust, No. 5
The figure is a graph showing the dependence of the area reduction rate on the magnetic flux density 13so at 500e for alloys with 0.5% Mn added (j+ -18%Fe and Co-12%Fe). This is a graph showing the dependence of the electrical resistance of Go-Pe alloys using different acid methods on annealing @. -1 Kazu Tate 2 Patent Attorney 1) Yuki Male Patent Attorney Aki Yamaguchi 1 Voice 2'? Annealing temperature (0c), Pa3'7' Annealing temperature (0C) Gi41' Annealing temperature (0c)

Claims (1)

[Claims] In a method for molding a soft magnetic material; A Co'-10 to 18-Fe alloy is melted, and immediately before casting, 1% by weight of Mn or less than 0.5% is added to the melted alloy. Mn less than 0.3 inches + Mitsushmeta A/(45<C'e <55+ 25<La <3
5゜10<Nd<20.2<Pr<10
), then the alloy is forged to form an ingot, firstly the ingot is hot worked and then cold η loe is applied. After intermediate annealing, it is finally cold worked with an area reduction rate of 70% or more,
A method for producing a soft magnetic material, characterized in that it is heat treated at a temperature above 800°cB.