JPS61209966A - Method of vacuum soldering inorganic insulator to copper material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a method for vacuum brazing an inorganic insulator and a copper material.

B8 Summary of the Invention This invention provides a method for bonding an inorganic insulator and a copper material using a vacuum filter, in which the component composition of a brazing filler metal consisting of copper-manganese-nickel is
By using 50% by weight of steel, 41% by weight of manganese, and 9% by weight of nickel, it is possible to improve the mechanical strength of the brazed joint and to obtain a highly reliable vacuum-tight joint.

C1 Prior Art An example of a conventional method for vacuum brazing joining an inorganic insulator and a metal, which is used to manufacture a vacuum container for a vacuum interrupter, will be explained. First, vacuum container A is as shown in FIG. A metallized layer 2 made of a molybdenum-manganese alloy is provided on both end faces of an inorganic insulating cylinder 1 such as glass or alumina ceramic, and this metallized layer 2 and one end face of the metal cylinder 3 are joined with a brazing material 4. , a metal end plate 7 was similarly brazed to the other end surface of the metal cylinder 3. Inside the vacuum container A is an electrode 5a.

A fixed lead rod 5 and a movable lead rod 6 each having a diameter of 6a are passed through each other in an airtight manner. The movable lead rod 6 is movable with a bellows 8 so as to be movable in the axial direction of the vacuum container A.
configured to be movable via the

The metal cylinder 3 is made of Covar # (Fe-Ni-Co)
, silver-copper solder is used as the brazing material 4, and in order to carry out vacuum brazing, the vacuum container A is temporarily assembled with the brazing material sandwiched between the parts to be brazed, and a vacuum pressure of about 10-5 Torr is applied. The process is carried out by heating to 900°C to 1050°C in a vacuum heating furnace holding . After brazing and joining, the product is slowly cooled in a vacuum heating furnace, and then the vacuum interrupter is completed.

D9 Problems to be Solved by the Invention According to the above conventional method, the metal cylinder 3 to be joined to the inorganic insulator cylinder 1 is Kovar, and the brazing material 4 is a silver-copper brazing material, so that the soldering material 5 is Material 4 is metallized layer 20
As it spreads over the entire surface, wax pools 4 are created to relieve local stress.
It was necessary to form a. In particular, when the inorganic insulator cylinder 1 is made of alumina ceramic, certain measures are required when brazing both ends at the same time, which is time-consuming and troublesome, significantly reducing manufacturing efficiency, and requiring airtight brazing. There was a problem that the mechanical strength was weak (and the vacuum seal would be destroyed if shocks were applied repeatedly).

Therefore, a copper material is used for the metal cylinder 3, and the brazing filler metal 4 is made of a known copper-manganese-nickel alloy (copper 53
% by weight, 38% by weight of manganese, and 9% by weight of nickel), the degree to which the brazing filler metal 4 corrodes the metal cylinder 3 is high.
・Thus, although the mechanical strength of the vacuum seal 5 is relatively good, the reliability of the vacuum seal is still insufficient.

E. Means for Solving the Problems In order to solve the above problems, the present invention provides copper-manganese-
In a method in which a brazing filler metal made of nickel is sandwiched between an inorganic insulator provided with a metallized layer and a metal made of copper, and the brazing filler metal is bonded with a filter in a vacuum heating furnace, the component composition of the brazing filler metal is set to 50% copper. [Provides a method of using this brazing filler metal for vacuum filtering between an inorganic insulator and a metal, with a proportion of 41% by weight of manganese and 9% by weight of nickel.

F. According to the present invention, since the brazing filler metal is made of steel-manganese-nickel filter 5, which is highly corrosive to copper materials, the airtightness of the brazed portion and its mechanical strength are good and stable, so vacuum leakage is prevented. This makes it difficult for vacuum interrupters to occur, extending the service life of the vacuum interrupter.

G. Example The present invention will be described below with reference to one embodiment thereof.

First of all, using FIG. 1, the main part of the vacuum container Ao after vacuum-tight brazing that satisfies the mechanical strength is shown in FIG.

In the figure, 1 is an inorganic insulating cylinder, 2 is a metallized layer made of molybdenum-manganese applied to the end face of the inorganic insulating cylinder 1, and 3 is a metal cylinder made of copper material. Also, A 1+
A2 is the part of the metallized layer 2 where the brazing material is not adhered,
This width is formed to be approximately 1n or more. Bl and B2 are brazing material reservoir parts, and the width thereof is less than 1 kat and is more than 003H. C! is the effective width dimension of the metallized layer 2.

The lower limit of the effective width C1 of the metallized layer 2 is determined as appropriate in consideration of the thickness dimension of the metal cylinder 3.

Therefore, the above-mentioned Ar, A2. The brazing method for obtaining each width dimension of Bl and B2 will be explained. The brazing filler metal 9 used here has a component composition of 50% by weight of copper, 41% by weight of manganese, and 9% by weight of nickel, and this brazing filler metal 9 has an abbreviated cross section as shown in FIG. It is burring molded. The following conditions are required for the thickness T1 and rising height H1 in this burring molding.

That is, Tl is 720 mm from the surface of the brazing material 9 when the warpage due to purling is small and when vacuum brazing is performed.
It is preferable to use an amount in which the melting point does not change significantly even if manganese escapes into vacuum at temperatures above .degree. C., for example, about 0.14 to 0.21 R1L.

In addition, Hl should be set to 5 so that it will remain on the inner diameter side even if the metal cylinder 3 expands, and should be about 0.5 mm to 1 mm (.

As shown in FIG. 2, the brazing filler metal 9 thus formed by burring is temporarily assembled between the metal cylinder 3 and the inorganic insulator cylinder 1, and then joined with the filter 5 in a vacuum heating furnace. .

The heating temperature in the vacuum heating furnace is 900° C. to 1050° C., the heating time is the time required until the brazing material 9 is fused, and the degree of vacuum is 10 −’ Torr or less.

Note that FIGS. 4 and 5 are sectional views of essential parts showing an application example of the present invention. In the example shown in FIG. 4, the joining end surface of the metal cylinder 3 is larger than the wall thickness T2, has a T-shape, and is joined with a copper-manganese-nickel brazing material 9 similar to the upper part. In FIG. 5, a stainless steel part 10 is joined to the outer surface of a metal cylinder 3 by a brazing material 9 of steel-manganese-nickel. For example, an end plate 7 can be welded to this stainless steel component 10.

H6 Effects of the invention According to the invention described above, an inorganic insulator and a copper material are bonded together using a copper-manganese-nickel solder containing 50% by weight of copper, 41% by weight of manganese, and 9% by weight of nickel. Since vacuum brazing can be performed, the corrosivity of the copper material is suppressed to an appropriate range, and the mechanical strength of the brazing is improved. Suitable for manufacturing. Moreover, the copper-manganese-nickel solder according to the present invention has a higher viscosity than silver-copper solder, and therefore, there is no need for special treatment to form a solder pool, for example, by simultaneously attaching a metal cylinder to both ends of a vacuum vessel in a vacuum furnace. It can be brazed within the vacuum container, improving the manufacturing efficiency of the vacuum container. In addition, the brazing filler metal is copper-
Since it is manganese-nickel brazing, it is also possible to simultaneously braze, for example, an end plate made of stainless steel to the outer end of a metal cylinder, which eliminates the inconvenience of conventionally attaching all the end plates by welding outside a vacuum furnace. In other words, when a copper-manganese-nickel solder is soldered once in a vacuum, the melt melts into the solidified copper-manganese-nickel solder because manganese has a high vapor pressure and is an additive element that lowers the melting point of the solder. There is less manganese (and the melting point increases. Therefore, it is possible to braze copper material to an inorganic insulator, and also braze stainless steel parts to the copper material using the same brazing filler metal. There is no need to use Kovar, which is a magnetic material, as the metal to be bonded to the object, and copper material can be used, so when used as a vacuum interrupter for large currents, there will be no current loss or noise generation due to magnetostriction. , etc.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts of an inorganic insulator and copper material joined by the method of the present invention, Fig. 2 is an exploded sectional view of the main parts showing the state before brazing according to the invention, and Fig. 3 is a perspective view of the main parts. FIGS. 4 and 5 are longitudinal sectional views of main parts showing an application example of the present invention, and FIG. 6 is a longitudinal sectional view of main parts of a conventional example. 1... Inorganic insulator cylinder, 2... Metallized layer, 3...
...metal cylinder, 6...wax pool, 9...brazing filler metal, AI
, A2... brazing metal non-adherent part, B1... brazing pool part.

Claims (1)

[Claims] In a method in which a brazing filler metal made of copper-manganese-nickel is sandwiched between an inorganic insulator provided with a metallized layer and a metal made of copper, and the brazing filler metal is brazed in a vacuum heating furnace, the composition of the brazing filler metal is as follows: A method for vacuum brazing an inorganic insulator and a copper material, characterized in that copper is 50% by weight, manganese is 41% by weight, and nickel is 9% by weight.