JPS61217569A - Production of sealing material - Google Patents

Abstract

PURPOSE:To omit or simplify the removal of an unnecessary oxide film and machining of an unnecessary part by constituting specifically a Cr-contg. sealing alloy plate to be used for an electrode, etc., for a display tube of a display, etc., in the stage of working said alloy plate to a required size and shape then subjecting the plate to a preliminary oxide film treatment. CONSTITUTION:Metallic or alloy plates 2 of a required size which do not form an oxide film by the preliminary oxide film treatment are welded and juxtaposed by welding on both sides on the thickness side of the sealing alloy plate 1 having the required size to form a sheet of the composite alloy plate in the stage of producing the electrode for the display tube. The composite ally plate is blanked or etched to the required size and shape. The plate 2 is then subjected to the preliminary oxidation treatment at 1,000-1,250 deg.C in a wet H2 atmosphere of dew point +10 deg.C -+40 deg.C if said plate is an Fe-30-50% Ni alloy plate, Fe, Ni metal or alloy. The plate 2 is subjected to the preliminary oxidation treatment at 1,000-1,050 deg.C in the above-mentioned atmosphere if the plate is copper or copper alloy. The formation of the oxide film on the surface of the plate 2 is thus obviated and glass 4 is sealed to the plate 1 part where the oxide film 3 is formed and deposited.

Description

Detailed Description of the Invention Field of Application This invention relates to a method for manufacturing a sealing material, particularly a sealing material used for electrodes for display tubes, etc., and a method for removing an oxide film during the production of electrodes, etc. The present invention relates to a method of manufacturing a sealing material that eliminates or simplifies the process of cutting unnecessary parts.

BACKGROUND ART In general, sealing alloys used for electrodes for display tubes, etc. of displays, etc. have two characteristics: 1) The coefficient of thermal expansion is close to that of soft glass; 2) The adhesion of the oxide film to the base material is good. ■Currently, sealing alloys of 15 to 30C are required to satisfy characteristics such as excellent punchability and workability.
r-Fe alloy, 40-48NL-4-8Cr Fe
alloy is used.

This sealing alloy is rolled to the required thickness, then hammered or etched into the required dimensions and shape, for example.
When manufacturing electrodes for display tubes, in order to improve adhesion to the glass of the display tube, moist H2 with a dew point of +10'C to +40C is applied to the sealing alloy plate. A preliminary oxide film treatment is performed at 1000°C to 1250°C in an atmosphere, but an oxide film is formed on the sheet metal surface, and cutting is performed to remove the unnecessary oxide film on the surfaces of the encapsulating side lead part and the external lead part. There is a need.

However, since the above-mentioned alloy plate has an extremely thin thickness and the oxide film has a dense structure and is firmly adhered to the alloy plate, cutting thereof requires a large amount of process and time.

Purpose of the Invention The present invention is aimed at sealing tube materials used for electrodes for display tubes such as displays or support plates for cathode ray tubes, etc., and the present invention is intended for use in sealing tube materials used for electrodes for display tubes, etc., or support plates for cathode ray tubes. The purpose is to provide a method for manufacturing a sealing material that can be omitted or simplified.

Structure and Effects of the Invention The present invention provides a sealing composite alloy in which at least one Cr-containing sealing alloy plate and a metal or alloy plate that does not produce an oxide film through preliminary oxidation coating treatment are welded and parallel to each other on their thickness sides. After processing or etching it into the desired shape in the board thickness direction, the dew point is +10'C to +40°C.
'C in a humid H2 atmosphere, 1000'C to 1250'C
This is a method for producing a sealing material, characterized in that a preliminary oxide film treatment is performed to form an oxide film on the surface of the sealing alloy.

As shown in FIG. 2, the composite alloy for sealing used in the method of this invention has various dimensions depending on the use and purpose.

In terms of shape and arrangement, Cr-containing sealing alloy plates and metal or alloy plates that do not produce an oxide film due to pre-oxidation coating treatment may be alternately welded and parallel on the thickness side, and as described later, the adhesion to the glass can be improved. Even if preliminary oxidation coating treatment is performed, the oxide coating is formed only on the required sealing alloy parts, so the steps of removing the oxide coating and cutting unnecessary parts, which were conventionally unavoidable, can be omitted or simplified.

Therefore, for example, reed pieces for reed switches are required to have magnetic properties, plating properties, and sealing properties, and conventionally, material selection has been extremely difficult, and it has been necessary to sacrifice any of the properties. However, in the sealed tube material used in the method of this invention, the inner part sealed in glass has only magnetic properties and noble metal plating properties, and the glass sealed part only has sealing properties, and the outer part has only good sealing properties. The lead part is soldered.

It is sufficient to use a material that pursues only plating properties, which has the advantage of making it easy to select materials according to the application and purpose.

In this invention, the Cr-containing sealing alloy plate is 15
% ~ 30% Cr Fe alloy plate, 40% ~ 48NL-4
%~8%Cr-Fe alloy plate is suitable, and this Cr
Any metal or alloy plate can be applied to the metal or alloy plate welded parallel to the thickness side of the contained sealing alloy plate, as long as an oxide film is not formed by preliminary oxidation film treatment, and the thermal expansion coefficient and thermal conductivity are Fe-30% from the viewpoint of consistency and cost
~55% Nj alloy plates, Fe, NL, CLL metal plates, etc. are preferable, and can be selected appropriately depending on the purpose and application. Various welding methods such as TIG welding, plasma welding, laser welding, etc. can be used. Welding methods can be applied.

In this invention, the Cr-containing sealing alloy plate contains 15% to 3%
0%Cr Fe alloy plate, 40%~48NL-4%~8
The reason for using the %Cr-Fe alloy plate is as follows.

In a 15% to 30% Cr Fe alloy, Cr is 15
If it is less than wt%, the coefficient of thermal expansion becomes large and the difference with the coefficient of thermal expansion of soft glass becomes too large, which is undesirable.
If it exceeds 0 wt%, workability deteriorates and it becomes difficult to form into a predetermined shape, so Cr is set at 15 wt% to 30 wt%.

In addition, in a 40% to 48NL-4% to 8%Cr Fe alloy, if Nj is less than 40 wt%, the coefficient of thermal expansion becomes small, and the difference with the coefficient of thermal expansion of soft glass becomes too large, making glass sealing difficult. , when it exceeds 48wt%,
The coefficient of thermal expansion becomes large and the difference with the coefficient of thermal expansion of soft glass becomes too large, which is undesirable.If Cr is less than 4 wt%, the coefficient of thermal expansion becomes small and the difference with the coefficient of thermal expansion of soft glass becomes large. If it becomes too large, the adhesion of the oxide film to the alloy base deteriorates, and if it exceeds 8 wt%, the coefficient of thermal expansion becomes too large and the difference with the coefficient of thermal expansion of soft glass becomes too large, which is not preferable.

In addition, any of the above sealing alloys can be heated.

In order to improve cold workability, the content of SL and ff1n is preferably o, oo5wt% to i, owt%, respectively, and in order to improve the adhesion with the oxide film, /V,
Zr, T.L.

At least one of Y or rare earth elements 0,00
5wt%~1. It is also good to contain Owt%.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram showing a method of manufacturing an electrode for a display tube using a composite alloy for sealing according to the present invention.

When manufacturing electrodes for display tubes, a metal or alloy plate (2) of the required size that does not produce an oxide film by preliminary oxide film treatment is placed on both thickness sides of the sealing alloy plate (1) of the required size.
are welded in parallel to form a single composite alloy plate, and then hammered or etched into the required dimensions and shape.

Next, a metal or alloy plate (2) welded and parallel to the sealing alloy plate (1) is made of Fa-30% to 55% Ni plywood, F
e. For Ni metal or alloy, dew point +10'C~÷4
In a moist H2 atmosphere at 0°C, perform a preliminary oxide coating treatment at 100°C to 1250°C, and if the alloy plate (2) is a 5 metal or a 5 alloy, in a moist H2 atmosphere with a dew point of +10°C to +40°C, By applying preliminary oxide coating treatment at 1000°C to 1050'C, a sealing alloy plate (
1) Oxide film with a thickness of 11 Jm to 511 m only on the surface (
3) is formed, but the metal or alloy plates (2) on both sides
No oxide film is formed on the surface.

Glass (4) is sealed to the Cr-containing sealing alloy plate (1) on which the oxide film (3) is formed and adhered.

The required Cr-containing sealing alloy (
Since the oxide film (3) is formed only on the part 1), the process of removing the oxide film on the surfaces of the external lead part (5) and the enclosed lead part (6), which was unavoidable in the past, is no longer necessary, and unnecessary parts can be cut. The process can be omitted or simplified, and it is extremely effective in reducing, simplifying, and reducing the manufacturing process of display tube electrodes.

In addition, using a material that has undergone preliminary oxidation coating treatment as shown in Figure 0, the tip of the lead part is plated with a precious metal (7) to reduce contact resistance and provide corrosion and wear resistance.
), then seal the two pieces of the precious metal plated (forced) material in a glass tube (8) with the precious metal plating (7) facing each other, and then seal the alloy plate (8) outside the glass tube (8). 2) After plating (9) with solder, tin, nickel, etc. to improve soldering, remove the lead connecting parts located at both ends of the processed material on the tip side. Can make tube electrodes.

As described in detail, the sealing material according to the invention allows the use of the necessary materials for each required location, and since the oxide film (3) is not formed on any parts other than the Cr-containing sealing alloy plate (1), the following Plating (7), (9), etc. during the process can be easily adhered and installed.

Examples Example 1 Cr18.2W with plate thickness 0.2m1 TIX width 10mm dimensions
On both sides of the j%-Fe sealing alloy, plate thickness 0.2 mm x width 3
A NL42.1wt%-Fe alloy plate with a size of 0 mm was
After welding them in parallel by IG welding, they were treated with a leveler for flattening to obtain a composite alloy for sealing according to the present invention.

Next, this sealed composite alloy plate was bonded to a lead length of 60 mm.
1 Lead part width 2.0mm, lead part pitch 5.0mm.

It was punched into a shape having 20 lead sections and a lead connection section with a width of 10 mm, and was subjected to preliminary oxidation coating treatment at 1100° C. for 1 hour in a humid H2 atmosphere with a dew point of +30'C.

As a result, in the arriving material according to the present invention, an oxide film mainly composed of Cr oxide with a thickness of 2 μm is formed only on the surface of the sealing alloy plate, and no oxide film is formed on the base alloy plate.
Brazing or soldering could be immediately and easily performed on the surface.

Example 2 Ni52wt%-Cr with plate thickness 0.5mm x width 5mm
On one side of the 6Wj%-Fe sealing alloy, a plate thickness of 0.5 mm was applied.
A CIL alloy plate with X width 20 + r + m dimensions, and a Ni52wt%-F with plate thickness 0.5 mm
After the e-alloy plates were welded in parallel by TIG welding, they were treated with a leveler for flattening to obtain a composite alloy for sealing according to the present invention.

Next, this sealed composite alloy plate was bonded to a lead length of 35 mm.
, lead part width 2.0mm, lead part pitch 3.0mm.

The lead part has 20 threads, and the lead connection part is 10 mm wide on the 5th plate side.
Preliminary oxide coating treatment was performed at 1020° C. for 11 hours in an atmosphere.

As a result, an oxide film mainly composed of Cr oxide with a thickness of 1βm was formed only on the surface of the sealing alloy plate, and no oxide film was formed on the C1 alloy plate portion.

Next, Rh plating is applied to the tip of the lead part after the preliminary oxide coating treatment, and two pieces of this plated material are sealed in a glass tube with the H plating facing each other. After applying solder plating to the plate part, the lead connecting parts located at both ends of the processed material were removed.

With the sealing material according to the present invention, necessary materials can be used at required locations, and an oxide film is not formed at locations other than the required locations, making it easy to perform plating in the next step.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a method of manufacturing an electrode material for a display tube according to the present invention. FIG. 2 is an explanatory cross-sectional view of the composite alloy for sealing according to the present invention. DESCRIPTION OF SYMBOLS 1... Cr-containing sealing alloy plate, 2... Metal or alloy plate, 3... Oxide film, 4... Glass, 5... External lead part, 6... Enclosed lead part, 7 ...Precious metal plating 8...Glass tube, 9...Plating. Figure 1 (a) (C) (e) 1'q'qs- Figure 112 (α) (b) (c) Self! i±-technique 6

Claims (1)

[Claims] 1 At least one Cr-containing sealing alloy plate and a metal or alloy plate that does not produce an oxide film due to preliminary oxide film treatment are welded and parallel to each other on their thickness sides, and further punched or etched into a desired shape in the thickness direction. After that, it was heated to 1000°C in a humid H_2 atmosphere with a dew point of +10°C to +40°C.
A method for producing a sealing material, characterized in that a preliminary oxide film treatment is performed at ~1250°C to form an oxide film on the surface of the sealing alloy.