JP2993757B2 - Brazing filler metal for ceramics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to ceramics and metals,
And a brazing filler metal for joining ceramics to ceramics.

[0002]

2. Description of the Related Art Conventionally, as a brazing material for joining ceramics, a paste obtained by mixing an Ag-Cu alloy powder and a Ti powder, adding a resin and an organic solvent to the mixture, and kneading the mixture into a paste is used. It is widely used because of its good properties and high bonding strength.

[0003] By the way, the brazing material for ceramics joining of the above components has a high melting point and therefore a high brazing temperature. Therefore, during brazing, the ceramic itself is damaged,
Cracks easily occur. In the case of brazing ceramics and metal, cracks are formed in the ceramics due to the difference in thermal expansion, and the metal is likely to be warped.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a low melting point brazing filler metal for ceramics which can lower the brazing temperature and increase the brazing strength.

[0005]

In order to solve the above-mentioned problems, a brazing filler metal for ceramics according to the present invention comprises Ag30 to 60 wt.
%, Cu20 to 45 wt%, In20 to 40 wt% alloy powder and the balance 0.5 to 10 wt% of a hydride powder of Ti or Zr or Hf, a resin and an organic solvent were kneaded to form a paste. Things.

[0006] In the brazing filler metal for ceramics of the present invention, the component composition of the metal brazing filler metal powder is limited as described above because the melting point is set to 700 ° C or less. Not obtained, the bonding strength is weakened, 60 wt%
If the temperature exceeds the above, the melting point will be high and the cost will be high. Cu is
If it is less than 20 wt%, the bonding strength cannot be obtained, and if it exceeds 45 wt%, the melting point does not decrease. If In is less than 20 wt%, the melting point is not lowered, and if it exceeds 40 wt%, the flow of the solder is too good and the bonding strength is weakened. If the hydrogenation active metal of Ti, Zr, or Hf is less than 0.5 wt%, the bonding strength becomes weak, and if it exceeds 10 wt%, no improvement in the bonding strength is observed.

[0007]

The brazing filler metal for ceramics of the present invention having the above-mentioned structure has a melting point of 700 ° C. or less, a low brazing temperature, and a uniform dispersion of hydrides. During brazing of ceramics, damage to the ceramics is suppressed, and cracks are less likely to occur. In addition, the difference in thermal expansion from the metal is reduced, and the metal is less likely to warp.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments and a conventional example of a brazing filler metal for ceramics according to the present invention will be described.

A metal brazing powder having the component composition shown in the left column of Table 1 below is mixed with a resin (alumina resin) and an organic solvent (α).
-Terpineol) and brazed ceramics (AlN) and metal (Cu) using the ceramic brazing materials of Examples 1 to 3 and the conventional example which were kneaded into a paste (brazing temperature: 650 in the example). ℃, conventional example is 900 ℃)
Then, the state of ceramics and metal was inspected, and the bonding strength was measured. As a result, the results shown in the right column of Table 1 below were obtained.

[0010]

[Table 1]

As is clear from Table 1 above, ceramics (AlN) was produced using the conventional brazing filler metal for ceramics.
When AlN and a metal (Cu) were brazed, AlN was cracked and Cu warped and the bonding strength was as low as 8 kg / cm ² , whereas the brazing materials for ceramic bonding of Examples 1 to 3 were used. When ceramics (AlN) and metal (Cu) are brazed, AlN does not crack, Cu does not warp, the bonding strength is as high as 10 kg / cm ² , and the brazing strength is low and the quality is stable. It can be seen that brazing of ceramics and metal was completed.

[0012]

As described above, according to the brazing filler metal for ceramics according to the present invention, the ceramics and the metal are not cracked at a low brazing temperature of 700 ° C. or less and the metal is not warped. A stable and high-quality brazing of ceramics is possible.

──────────────────────────────────────────────────続 き Continuation of front page (51) Int.Cl. ⁶ identification code FI B23K 35/30 310 B23K 35/30 310C C04B 37/00 C04B 37/00 B (58) Fields surveyed (Int.Cl. ⁶ , (DB name) B23K 1/19 C04B 37/00

Claims (1)

(57) [Claims] 1. Ag 30-60 wt%, Cu 20-45 wt%, In
A metal brazing powder comprising 20 to 40 wt% of an alloy powder and a balance of 0.5 to 10 wt% of a hydride powder of Ti or Zr or Hf;
A brazing filler metal for ceramics, which is formed by kneading a resin and an organic solvent into a paste.