JPH0263696A - metal brazing material - Google Patents

Abstract

PURPOSE:To obtain a uniform adhesive surface and to mechanically or thermally obtain the stability by providing plural projections on at least one adhesive surface of a metallic brazing filler metal so that the metallic brazing filler metal and the adhesive surface of a member to be stuck come into contact with each other in plural points, lines or faces. CONSTITUTION:A metallic brazing filler metal 1a or 1b is inserted and held between two members and a temperature of the whole is raised to above a melting point of the metallic brazing filler metal. Melting of the metallic brazing filler metal, that is, fitting or wetting of the metallic brazing filler metal and the surface to be stuck starts from a contact of the metallic brazing filler metal and the surface to be stuck. Thereafter, an expanse of the metallic brazing filler metals 1a, 1b is generated. In such a way, an adhesion of the metallic brazing filler metal and two members becomes uniform, no void is generated, or even if a void is left, it becomes a small void which is dispersed finely, a uniform adhesion is obtained, and an adhesion having no problem mechanically and thermally can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the shape of a metal brazing material used when bonding two members together.

[Conventional technology]

FIG. 2 is a perspective view showing a conventional metal member. This metal brazing material 1 is substantially flat, and in addition to a simple rectangular plate as shown in FIG. 2, there are also types finished in a shape that matches the object to be bonded.

FIG. 3 shows a cross-sectional view of two members bonded together using the four-piece material shown in FIG. 1. Here, the metal brazing material 1 is in the form of a plate, and this metal brazing material 1 is melted at a high temperature, blended into the members 2 and 3 to be bonded, and then returned to room temperature to solidify. Therefore, the shape of the brazing metal material 1 differs before and after melting. In the stage before the above bonding process, the metal brazing material 1
is not a perfect plane, and the bonding surfaces of the bonded members 2 and 3 are also not perfect planes, so generally the bonding surfaces between the metal brazing material 1 and the bonded members 2 and 3 are partial.

Therefore, when the metal brazing material 1 is melted, a gap exists between the metal brazing material 1 and the members 2 and 3, and after the metal brazing material 1 solidifies,
Depending on the flow of the brazing material, large air bubbles 4 as shown in FIG. 3 may be left behind.

[Problem to be solved by the invention]

The conventional bonding using metal brazing material is as described above.
If the bubbles 4 remain after solidification, the original adhesive function will be impaired and problems will arise in terms of mechanical strength and heat.

This invention was made in order to solve the above-mentioned problems, and when bonding two members using metal brazing material, the bubbles are eliminated or dispersed to a small size, and the bonding function is sufficient both mechanically and thermally. The purpose is to provide something that maintains the

[Means to solve the problem]

The metal brazing material according to the present invention is a material that is sandwiched between two members and melted by heating to bond the two members together. It is characterized in that a protrusion is provided so that the bonding surfaces of the brazing metal material and the bonded member are in contact with each other at a plurality of points, lines, or planes.

[Effect]

The metal brazing material in the present invention is configured so that the plurality of protrusions and the adhered member are in point contact, line contact, or surface contact, and when solidified after melting, the metal brazing material spreads from the contact portion, resulting in - Various adhesive surfaces can be obtained.

〔Example〕

FIG. 1 is a perspective view showing a metal brazing material according to an embodiment of the present invention, and in the case of FIG. 1(a), the contact between the metal brazing material and the member to be bonded is point contact; In case b), there is a line contact.

In other words, if the brazing metal material 1a or [b] of the above example is sandwiched between two members and the overall temperature is raised above the melting point of the brazing metal material, the melting of the brazing metal material, that is, the soldering material and the bonded material. "Familiarization" or so-called "wetness" with the surface refers to the contact point between the metal brazing material and the surface to be bonded (Fig. 1h) of the metal brazing material 1a.
(when using the brazing metal material 1b of FIG. 1(b)) or from a tangent line (when using the brazing metal material 1b in FIG. Then metal brazing material 1
A, 1b spread occurs. Therefore, metal brazing material and 2
The adhesion between two members is different, with no voids or even if there are any voids, they are finely dispersed and small. In other words, uniform adhesion can be obtained, and adhesion without mechanical or thermal problems can be realized.

In addition, in the above example, a brazing metal material with pentagonal pyramid or triangular prism-shaped protrusions was shown, but the same effect can be obtained even if many thin cylindrical protrusions or thin cylindrical holes are provided. Effects can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, since the metal brazing material and the member to be bonded are brought into contact with each other at a plurality of points, lines, or planes, a -like bonding surface can be obtained when solidifying after melting.
It is mechanically or thermally stable and is effective for bonding power transistor elements to heat dissipation blocks.

[Brief explanation of the drawing]

1(a) and (b) are perspective views showing a metal brazing material according to an embodiment of the present invention, FIG. 2 is a perspective view showing a conventional metal brazing material, and FIG. 3 is a perspective view showing a conventional metal brazing material. A cross-sectional view is shown when bonding is performed using a material. In the figure, Ia and 1b are metal brazing materials.

Claims (1)

[Claims] In a metal brazing material that is sandwiched between two members and melted by heating to bond the two members together, a plurality of protrusions are provided on at least one bonding surface of the metal brazing material to bond the metal brazing material and the covered material. If the adhesive surface of the adhesive member has multiple points, lines,
A brazing metal material characterized in that it is in contact with another surface.