JPH0615464A - Diffusion brazing method - Google Patents

Abstract

PURPOSE:To execute joining in a short time, and also, to easily execute joining even if a shape of a joining member is complicated. CONSTITUTION:By spraying a brazing filler metal to at least one of joint surfaces of metals 1, 2 to be joined, films 3, 4 allowed to adhere closely and mechanically are formed, and subsequently, both the member 1, 2 are inserted and attached by electrodes 6, 7 consisting of a pressure jig. While pressurizing them, electric conduction is executed and they are joined by melting and diffusing the sprayed deposits 3, 4 by resistance heating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid phase diffusion bonding method in which a metal such as a brazing material is sprayed and the coating is melted to bond both members.

[0002]

2. Description of the Related Art (1) Japanese Unexamined Patent Publication No. 64-18574 and (2) Japanese Unexamined Patent Publication No. 2-12
1781 is available.

In the case of the above (1), a brazing material or a metal having a similar component is formed as a thermal spray coating on the metal joining surfaces of both members to be joined, and this coating is placed in the mold. It is a method of joining both members by heating and melting.

Further, the method shown in (2) is a case where heating is performed with a powder brazing filler having a lower melting point than that of both joining materials interposed between both members at a time, and the molten powder is diffused into both joining members and joined. In this method, nickel amorphous foil is used as the brazing material powder.

[0005]

However, in the method described in (1) above, heating is performed by using an electric furnace, high frequency heating, or the like as a heating method, and as a result, there is a problem that the bonding time takes 5 minutes or more. is there.

The joining method shown in (2) shortens the joining time by heating using resistance heating, but since nickel amorphous foil is used as the brazing material, the brazing material is difficult to set, and the brazing material is difficult to set. Since it is necessary to match the shape of the above with the material to be joined, it is difficult to make it flexible.

The present invention has as its technical subject a diffusion brazing method capable of joining in a short time and easily joining even if the joining members have complicated shapes.

[0008]

The technical means for solving the problems are as follows.

A brazing material is sprayed on at least one of the joining surfaces of the metals to be joined to form a film that is mechanically adhered, and then both members are attached by an electrode composed of a pressure jig. A diffusion brazing method in which the sprayed coating is joined by melting and diffusing the sprayed coating by resistance heating by energizing while applying pressure.

[0010]

[Function] A self-fluxing alloy is used as a material for thermal spraying on the joint surface.
~ 60μm sprayed and heated at a resistance temperature of 1100 ° C,
Moreover, the diffusion bonding can be performed in a short time by applying a pressing force.

[0011]

EXAMPLES Examples will be described below.

In FIG. 1, reference numerals 1 and 2 denote joining members to be joined to each other. The joining method will be described with reference to FIGS.

(1) As shown in FIG. 2, a brazing material containing a readily diffusing element such as Cr, B, Si, and C is sprayed on the joint surfaces 1 and 2 of both members, so that they are mechanically adhered to each other. Film 3,
(2) Next, the sprayed film is melted by heating the electrodes while applying pressure (P) to the electrodes 6 and 7 of the resistance heating device 5 shown in FIG. Diffusion bonding. The electrodes 6 and 7 are provided with a pressing jig, and the metal members 1 and 2 are pressed and heated to be joined.

As a condition for diffusion brazing, the thermal spray coating is Ni
-Cr-Si-B-C self-alloy, with a coating of 50-60
μm, the pressure applied by the pressure jig is 600 kg, and the temperature due to resistance heating is 1100 ° C.

As a heating method, as shown in FIG. 4, a current of 15 KA is repeated every 3 cycles, 3 cycles ON-3 cycles OFF × 60 times, and the bonding strength is 37 Kg / mm ² .

The present invention is not limited to the above-described embodiments, but various changes can be made to the components of the thermal spray coating, the current control method at the time of joining, numerical data and the like.

[0017]

The present invention has the following effects. That is, (1) a sprayed coating can be diffusion bonded with a round bar of about φ25 mm (S15) in about 15 to 20 seconds including the cooling time. (2) Even if the shape of the bonding member is complicated, the brazing material is sprayed. Therefore, there is no need to preform and therefore no mold is required.

[Brief description of drawings]

FIG. 1 is an external view of a joining member.

FIG. 2 is an external view showing a state in which a coating is sprayed on both ends of the joining member.

FIG. 3 is a diagram showing a resistance heating device.

FIG. 4 is an explanatory diagram of a pulse current during resistance heating.

[Explanation of symbols]

 1, 2 Metal to be joined 3, 4 Sprayed coating 5 Electrode heating device 6, 7 Pressurizing jig

Claims (1)

[Claims] 1. A brazing material is sprayed on at least one joining surface of metals to be joined to form a film that is mechanically adhered, and then both members are sandwiched by an electrode composed of a pressing jig. A diffusion brazing method in which the sprayed coating is joined by melting and diffusing the sprayed coating by resistance heating by applying electricity while applying pressure.