JPS60103156A - Alloy for reed switch and reed switch - Google Patents

Abstract

PURPOSE:To obtain an alloy for a reed switch having high suitability to seal bonding to glass and low electric resistance and generating a small quantity of heat by providing a specified composition consisting of one or more kinds of elements selected among the group Va and VIa elements and Fe. CONSTITUTION:This alloy for a reed switch consists of 0.1-10wt%, preferably 1-5% one or more kinds of elements selected among the group Va and VIa ele- ments and the balance essentially Fe. The alloy has 80X10<-7>-130X10<-7> coefft. of thermal expansion which is equal to that of glass for a reed switch, <=30muOMEGA cm low electric resistance and high suitability to seal bonding to glass, and a reed switch having a reed part which generates a small quantity of heat in spite of an increased level of electric power can be obtd. Said group Va and VIa elements include V, Nb, Ta, Cr, Mo and W, and Nb which is very effective in improving the elasticity is preferably used.

Description

[Detailed description of the invention] [@Ming's technical field] Taibou decoy H'11-)-' 2 Itsu Imada Kyoto V group A
[Technical Background of the Invention and Problems Therewith] A reed switch is a switch in which a reed member is sealed in a glass tube and an inert gas is introduced into the glass tube so that the reed switch is not affected by the external atmosphere. This switch performs opening and closing operations using a magnetic field outside the glass tube. A switch that opens when an external magnetic field is present is called a self-holding switch, and a switch that closes when an external magnetic field is present is called a non-self-holding switch. The present invention relates to a non-self-holding switch.

Conventionally, as this lead material, an alloy called 52 alloy consisting of 50 to 5370 nickel and the balance iron is often used.

This lead material is required to have many properties such as sealing properties, high magnetic permeability, high magnetic flux density, and low coercive force, but it is especially important that it be able to withstand glass sealing (sealing properties). .

Glass for reed switches has a thermal expansion coefficient of 80X.
10' to 130 x 10' are used, but it is preferable for the lead material to have a coefficient of thermal expansion close to this.

This can improve sealing performance. In this respect, 52 alloy is an excellent material.

On the other hand, recently there has been a particular demand for materials for lead members that have low electrical resistance as well as good sealing properties with glass. This is because lead members that generate less heat are required as devices become more powerful. If the amount of heat generated is large, it can cause problems such as damage to the reed switch itself and damage to peripheral equipment.

Conventional 52 alloy had a resistance value of about 40 μΩ, so it could be used for small power reed switches, but
It could not withstand high-power use.

Attempts have been made to create a material that satisfies both electrical resistance and thermal expansion coefficient, but it has been difficult to achieve this goal.

[Purpose of the invention]

The present invention provides: (1) an electrical resistance value (hereinafter referred to as ρ) of 30μΩα or less, and (2) a thermal expansion coefficient (hereinafter referred to as α) of 80X10-7
It is an object of the present invention to provide an alloy for a reed switch having a lead portion of ~130X10.

[Summary of the invention]

In order to achieve the above object, the present invention
0% by weight of one or more elements selected from the group
．． Provided is an alloy for a reed switch containing 1 to 10% of iron, the remainder being substantially iron.

Group Va and Vla elements include vanadium, niobium,
There are tantalum, chromium, molybdenum, and tungsten, and the present invention lowers the coefficient of thermal expansion (α) without significantly reducing the electrical resistance (ρ) of the base material (iron) by adding these elements. This was done with a focus on what can be done.

Content uO, 1% or more is practically effective, while 10
% or less, workability and electrical resistance are not significantly impaired and it is practical.

Therefore, the content is preferably 0.1 to 10%, and even more preferably 1 to 5%.

In addition, if necessary, magnesium, calcium, silicon, aluminum, etc. can be added as a deoxidizing agent. A trace amount of these components is allowed to remain as long as the properties are not impaired.

Further, the addition of the Va group and Via group additive elements improves the springiness of the reed material, making it even more effective as a reed switch material. Young's modulus of springiness is 1000
A value of 0 or more is desirable, and a value of 13,000 or more is even more clever.

Among the above additive elements, niobium particularly improves the springiness.

On the other hand, regarding electrical resistance and thermal expansion coefficient, the thermal expansion coefficient is 80X10-7 to 130X10-7 and the electrical resistance is 30μ.
It is practical if the coefficient of thermal expansion is 90 or less.
It is more preferable that the electrical resistance is 20 μΩ or less.

[Embodiments of the invention]

The present invention will be explained below using examples.

An alloy having the components shown in the table was melted and subjected to hot and cold working to obtain a wire with a diameter of 0.6 mm, from which a reed switch was manufactured.

At this time, no cracks were observed in the sealed portion with the glass.

In addition, the values of 52 alloy are also shown as a comparative example.

As is clear from the table, the lead material of the present invention has a single air resistance of 30μΩα or less and a thermal expansion coefficient of 80×1
Since it falls within the range of 0 to 130X10-7, we were able to provide a good reed switch in the 100W mounting test.

Margins below [Effects of the Invention] The present invention is directed to an alloy containing 0.1 to 10% by weight of one or more elements selected from the Va group and the Via group, and the balance consisting essentially of iron. By using
~130x10-7 can be provided.

Representative Patent Attorney Kensuke Chika (one person) Procedure Amendment Yama (voluntary) 1. Indication of the case Japanese Patent Application No. 58-210745 2. Name of invention Reed Switch Kawagoki and Reed Switch 3. Amendment Detailed explanation of the invention of Toshiba Corporation Head Office Uchimei Am, No. 1, Shibaura-chome-1, Minato-ku, Tokyo 105, Japan Column 6, Contents of correction (1) ``External atmosphere...'' written in the 2nd negative line 3rd and 4th line for specifications has been changed to ``Extended life and high reliability of contacts.'' It was corrected to ``I tried to do it.''

(2) "
I hear that there is something... ' has been corrected as follows.

(Note) As per 1-) A switch that switches according to 0 is called a non-self-holding switch, and a switch that uses a semi-hard wire for a part of the circuit and can maintain a quiet state even when the magnetic field is removed is called a self-holding switch. It is called a holding type switch.

The present invention applies 13Q to the soft magnetic alloy used for these.
'I'? a b's. J or more

Claims (1)

[Scope of Claims] (11 selected from Va group and Via group or /li
An alloy for reed switches containing two or more elements in an amount of 0.1 to 10% by weight, the remainder being substantially iron. (2) The alloy for a reed switch according to claim 1, wherein the content of the element selected from the VA group and the ■A group is 1 to 5%. (3) The alloy for a reed switch according to claim 1, wherein the alloy has a coefficient of thermal expansion of 80X10 to 130X10 and an electrical resistance of 30 μΩG or less. (A reed switch in which an alloy containing 0.1 to 10% by weight of 1m or 2 or more elements selected from the 41 Va group and the Vla group, and the remainder substantially iron is used for the reed portion.