JP2986624B2 - Active metal brazing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active brazing filler metal used for joining ceramics and metal.

[0002]

2. Description of the Related Art Conventionally, as a brazing material used for joining ceramics and metal, Ag (71-73%)-Cu (27-29%) / Ti / Ag (
71-73%)-Cu (27-29%) Ag 71% -Cu 27% -Ti 2% Ag 60% -Cu 30% -In 10% / Ti / Ag 60% -C
u30% -In10% Ag60% -Cu30% -Sn10% / Ti / Ag60% -C
A brazing material such as u30% -Sn10% is used. By the way, these brazing materials have a problem in that Ti moves to the metal side during brazing, and the brazing interface becomes weak. Also, depending on the ceramics to be joined, the amount of Ti may be small and brazing may not be successful. For this reason, the amount of Ti is increased (3% or more) to perform melting and casting to produce an Ag-Cu-Ti brazing filler metal. However, an intermetallic compound of CuTi is generated and processed into a plate or wire. Becomes difficult.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention suppresses the movement of Ti to the metal side during brazing of ceramics and metal, thereby preventing the brazing interface from becoming weak and containing Ti. An object of the present invention is to provide an active metal brazing capable of improving the strength of a brazed joint without impairing workability even if the amount is increased.

[0004]

The active metal braze of the present invention for solving the above-mentioned problems has an upper layer made of Ag-Cu-In-.
Alloy containing less than 3% Ti in Sn-based alloy, intermediate layer made of Ti
Or Zr or Hf, and the lower layer is made of Ag-Cu-In-Sn.
A three-layer clad brazing alloy consisting of a series alloy, the melting point of the brazing material is 650 ° C or more, and the total content of Ti, Zr, and Hf is
It is characterized by being 3.5 to 10%. In the active metal braze of the present invention, the upper layer is made of Ag-Cu-In-S.
The reason for using an alloy containing less than 3% of Ti in the n-series is that when the brazing material in the upper layer is melt-cast, an intermetallic compound of CuTi is not generated and processing into a plate or wire is easy. is there. The reason why Ti is contained only in the upper brazing material is to dispose the upper brazing material on the ceramic side to increase the brazing activity and improve the strength of the brazed joint. Further, the melting point of the brazing material was set to 650 ° C. or higher because of the T
This is for promoting the activation of i, Zr and Hf to secure the brazing strength. Furthermore, the reason why the total content of Ti, Zr and Hf is set to 3.5 to 10% is to increase the content of these active metals in the brazing material to improve the strength of the brazed joint.

[0005]

The active metal brazing having the above-mentioned structure is characterized in that, in the brazing of ceramic and metal, when the brazing material of the upper layer containing Ti is arranged on the ceramic side and brazing is performed, the Ti in the brazing material of the upper layer is formed. Moves to the ceramics side, and following this, Ti or Zr or Hf of the intermediate layer moves to the ceramics side, and Ti, Zr or Hf hardly moves to the metal side. Therefore, on the metal side, the brazing interface is not weakened and the brazing strength is increased, while on the ceramics side, the wettability to the ceramic is also improved, and the brazing is remarkably activated, the brazing strength is increased,
The strength of the brazed joint as a whole is improved. Furthermore, T
Since i, Zr, or Hf is present, the coefficient of thermal expansion is also reduced, and the stress on the ceramic is relaxed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the active metal brazing according to the present invention will be described together with a conventional example. The three-layer clad solders of Examples 1 to 3, the alloy solders of Conventional Examples 1 to 3, and the three-layer clad solder of Conventional Example 4 having the component compositions shown in the left column of Table 1 below were 5 mm long and 5 m wide.
m, of Al ₂ O ₃ of length 20mm blocks and vertical 5 mm, lateral 5m
m, a length of 20 m, which was used to join an end face with a block of Fe-Ni 42%. The wax dimensions are 5mm long, 5mm wide, and 0.
07mm, brazing in vacuum (1 × 10 ^-4 to 10 ^-5 Torr)
r), the temperature was raised at a rate of 20 ° C./min, and the brazing temperature was maintained at the temperature shown in the center column of Table 1 for 10 minutes, followed by brazing under the condition of furnace cooling. When the brazing strength of the Al ₂ O ₃ block and the Fe-Ni 42% block after brazing was measured by a four-point bending test, the results shown in the right column of Table 1 below were obtained.

[0007]

[Table 1]

As apparent from Table 1 above, Conventional Examples 1 to 4
The brazing materials of Examples 1 to 3 have low brazing strength.
It can be seen that the brazing material has a remarkably high brazing strength.

[0009]

As described above, in the active metal brazing according to the present invention, when brazing ceramics to metal, Ti, Zr or Hf moves to the ceramic side, and hardly moves to the metal side. Therefore, the metal side has a high brazing strength without weakening the brazing interface, while the ceramic side has a remarkably activated brazing, high brazing strength, and a high content of the entire brazed joint. Workability is not impaired.

Claims (1)

(57) [Claims] An upper layer is made of Ag-Cu-In-Sn based T
i is an alloy containing less than 3%, the intermediate layer is a three-layer clad brazing alloy made of Ti or Zr or Hf, and the lower layer is an Ag-Cu-In-Sn based alloy, and the melting point of the brazing material is 650.
℃ or more, total content of Ti, Zr, Hf is 3.5-10%
An active metal braze characterized in that: