JPS6182996A - Manufacturing method of composite brazing filler metal - 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 (Industrial Application Field) The present invention relates to a method for manufacturing a brazed composite strip by bonding a solder strip in a layered manner to the surface of a Ti strip.

(Prior art and its problems) Generally, brazing filler metals containing Ti are used to bond ceramics to ceramics and metals to ceramics, taking advantage of the active properties of Ti, but these alloys containing Ti are brittle. Because it forms an alloy phase, if it is plastically worked into a plate or wire shape, it will crack or break.

Therefore, it is difficult to manufacture thin sheet ribbons and thin wires, and restrictions have been placed on the shapes and methods of use.

In addition, in order to avoid these brittle alloy phases, a method has been adopted in which Ti and brazing filler metal are bonded together and used as a composite material.
Since i is active and tends to form an oxide film on the surface, it is difficult to bond with the brazing material and it is difficult to obtain sufficient adhesion strength, making it impractical.

(Objective of the Invention) The present invention aims to provide a manufacturing method for obtaining a Ti-containing composite brazing filler metal suitable for brazing and having high bonding strength without forming such a brittle alloy phase.

(Structure of the Invention) Next, the method for producing a composite brazing filler metal according to the present invention will be described. First, a chemically stable layer of about 2 to 10 microns is formed on the surface of a Ti strip by plating. The reason for providing this layer is to form a protective film that prevents oxidation of the active Ti surface, facilitate bonding with the brazing material in the next step, and obtain strong bonding strength.

Therefore, the thicker the plating layer, the greater the effect, but 2μ
A thickness of 10 μm or more is sufficient to achieve the purpose, and since forming a thick layer requires a long processing time and is not economically advantageous, a thickness of up to 10 μm is appropriate. The method for plating the Ti surface is to first polish the surface with sandblasting, then treat the surface with a fluoride-based chemical, and then apply plating.

The material to be plated on the Ti surface may be any material as long as it does not form an oxide film, is chemically stable, and facilitates bonding, such as Ag or Au.

Pd and Pt are suitable.

On the other hand, the brazing material to be laminated with Ti is prepared with a material having an appropriate thickness and a smooth and clean surface. When this brazing filler metal reaches the brazing temperature and melts, it melts together with the Ti bonded to the brazing filler metal, forming a Ti-containing brazing filler metal composition, and in this state, it has a brazing effect with the overlying brazing metal. Therefore, it is desirable that the chemical composition of the brazing filler metal when melted and containing Ti be suitable for brazing, and the thickness of the Ti material and the brazing filler metal forming the composite material should be suitable for brazing. controlled by.

The method of joining the brazing material and the Ti material is to stack the brazing material by placing the brazing material so as to face the Ti material which has been treated as described above, and then joining the material.

The joining methods are hot rolling and seam welding.

Hot pressure welding and various other methods are available, and can be determined according to the shape.

Further, it is desirable to perform this bonding in an inert atmosphere such as argon or nitrogen.

The composite filler metal laminated in layers is then cold rolled,
Repeated annealing process produces a thin plate or sheet ribbon shape.

The brazing filler metal obtained in this way can be easily finished into the desired size and shape, and T is suitable for brazing ceramics.
A good brazed state can be obtained by utilizing the active nature of i.

Next, in order to further clarify the present invention, specific examples and comparative examples thereof will be described.

(Example 1) A Ti tape material having a width of 15fi and a thickness of 0.2H was subjected to sandblasting treatment and fluoride-based chemical treatment, and then wet Ag plating was performed to obtain an Ag film with an average thickness of 5μ.

A tape material of 28% by weight of A g -Cu with a width of 15 fl and a thickness of 0.6 fl was placed on both sides of this Ti tape, facing each other, and was made into three layers and heated to approximately 600'C in an argon atmosphere using a hot press bonding machine. A composite solder tape material was obtained by joining while heating. This tape material had sufficient bonding strength, and as a result of making a tape material with a thickness of 70μ by subsequent cold rolling and brazing ceramics together, a good brazing condition with high brazing strength was obtained. .

(Example 2) A Ti tape material with a diameter of 20,111 m and a thickness of 50 μm was wrapped around a stainless steel cylindrical drum and placed in a vacuum container of a vapor deposition device, an Ag target was set parallel to and facing the drum, and the drum was rotated. , the degree of vacuum inside the device is 3X 10T
Sputtering was carried out twice at orr to obtain an Ag film with an average thickness of 3 μm on each side of the Ti tape.

A tape material of 28i mass % of Ag-Cu having a width of 20fi and a thickness of 150μ was placed on both sides of this Ti tape in three layers facing each other.
A composite tape material was obtained by joining while heating to 00°C. This tape material had sufficient bonding strength, and was then cold-rolled to produce a tape material with a thickness of 70 μm. As a result of brazing the ceramics together, a good brazed state with high brazing strength was obtained.

(Comparative Example) A Ti tape material of 15fl medium and 0.2u thick was sandblasted and treated with fluoride chemicals.

A tape with a width of 15 fl and a thickness of 0.6 m is used on both sides of this Ti tape.
g -Cu 2 layers by weight of tape materials were made to face each other and made into 3 layers in a hot bonding machine in an argon atmosphere for about 6
Attempts were made to join while heating to 00°C, but the adhesion strength was weak and peeling occurred during subsequent cold rolling, making it impossible to obtain a composite brazing filler metal.

In addition, although wet plating and sputtering were described for plating the Ti surface in the examples, the present invention is not limited to this, and ion blating, vapor deposition, etc. may also be used.

(Effects of the Invention) As detailed above, the manufacturing method of the present invention forms a protective film by wet or dry plating, and bonds it with a brazing material through this film to form a composite material, so the bond is strong. Moreover, since it has sufficient workability without forming a brittle alloy layer, a brazing material having a size and shape suitable for brazing can be easily obtained.

In addition, by changing the components and thickness of the materials before joining, it is possible to easily obtain materials with the required chemical composition, and it is possible to obtain good joining conditions when brazing ceramics to ceramics or ceramics to metals. There is an effect that says it can be done.

Claims (1)

[Claims] 1) After forming a chemically stable protective coating layer on the surface of the Ti strip by plating, a brazing strip is overlaid and bonded to the Ti strip to form a layered composite strip. A method for producing a composite brazing filler metal. 2) The method for producing a composite brazing material according to claim 1, wherein the chemically stable protective coating layer has a thickness of 2 to 10 microns.