JPH046174A - Composite foil brazing material for joining ceramics - Google Patents

Abstract

PURPOSE:To provide the above composite foil brazing material which has excellent brazing workability and with which high strength of adhesion is obtainable by coating both surfaces of the Ti material which a core material with 3 laminated materials consisting of Cu/Zr/Cu in such a manner that the Cu material is the outermost surface and the sectional area ratios of the respective blank substrates attain specific values. CONSTITUTION:Both surfaces of the Ti material which is the core material are coated and formed with the 3 laminated materials consisting of the Cu/Zr/Cu as a skin material in such a manner that the outermost surface is the Cu mate rial. Further, the materials are so formed that the sectional area ratios of the Ti material, the Zr substrate and the Cu material attain 25 to 40% Ti material, 15 to 30% Zr material and 30 to 60% Cu material, by which the composite foil brazing material for joining ceramics consisting of the 7-layered composite materials is produced. The resulting brazing material is as relatively low as 860 deg.C in brazing working temp. and, therefore, the brazing work can be carried out with good workability. In addition, the high strength of adhesion is obtd. and further, the easy and excellent adhesion is executed even if the shapes of the joint surfaces of the materials to be joined are intricate.

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a foil-shaped composite brazing material for joining ceramics, in which a Ti material is used as a core material and Cu/Cu/
By constructing a 7-layer composite foil brazing material covered with a Zr/Cu outer skin material, the working temperature for brazing is relatively low at 860°C, and the brazing workability is excellent and high adhesive strength can be obtained. This invention relates to a composite foil brazing material for joining ceramics.

Conventional technology Generally, in mechanical parts, electric/electronic parts, etc., metals such as Mo and W, which have similar thermal expansion coefficients and good wettability, are used for joining ceramics together by metallizing them. After that, the metallized surface was joined by Ag brazing, but the metallizing and Ag brazing required a great deal of effort and cost, especially for irregularly shaped ceramic plates with irregularities on the joining surface. There were many problems in joining.

In view of the current situation, this invention uses a brazing filler metal, which has a low working temperature, is easy to handle, has excellent bonding workability, provides high bonding strength, and can reduce bonding costs when joining ceramics together. intended to provide.

Summary of the Invention The inventors aimed to reduce the cost of joining ceramics together in mechanical parts, electric/electronic parts, etc., and developed a brazing material that is easy to handle and has low working temperature and excellent properties. As a result of various studies on foil-shaped brazing materials that are considered easy, we selected a combination of these materials using Ti, Zr, and Cu materials, and created a composite foil material with a specific cross-sectional area ratio by pressure welding. This invention was completed based on the finding that brazing materials exhibit excellent brazing properties at relatively low temperatures and can be provided at low cost as a brazing material for ceramics in mechanical parts, electric/electronic parts, etc.

In other words, the present invention is characterized in that carbon is applied to both sides of the core Ti material so that the outermost surface is Cu material.
It consists of a 7-layer composite material formed by covering a 3-layer material consisting of u/Zr/Cu as an outer skin material, and the cross-sectional area ratio of the Ti material, Zr material, and Cu material is as follows: Ti material: 25% to 40% Zr material This is a composite foil brazing material for joining ceramics, characterized in that it contains 15% to 30% Cu material and 30% to 60% Cu material.

The composite foil brazing material according to the present invention has good wettability with ceramics and nox, making it ideal for brazing ceramics together, eliminating the need for a prior metallizing process on ceramics, unlike conventional Ag brazing material, and further , Brazing has a relatively low working temperature of 860℃, and has excellent workability.
This is a foil-shaped composite brazing material that provides high adhesive strength.

Further, the composite foil brazing material according to the present invention can join ceramics such as any oxide ceramics and nitride ceramics, whether they are made of the same material or dissimilar materials.

Structure of the Invention The composite foil brazing material for ceramic bonding according to the present invention is T
I material is used as a core material and Cu/Zr/C is applied to both sides.
Cu/Zr/Cu/Ti/Cu/
It is a Zr/Cu seven-layer composite foil brazing material, and as shown in FIG. 1, the top layer is the first layer and the bottom layer is the seventh layer, and the layers are laminated as shown in Table 1 below.

Table 1 In this invention, the reason why Ti is used as the core material of the fourth layer as a composite foil brazing material is that it is used together with Zr material (second layer, sixth layer) in the three laminated materials of the outer skin material and ceramics as an active metal. It is necessary to react and obtain the required adhesive strength.

As mentioned above, the Zr material (second layer, sixth layer) not only contributes to bonding with ceramics as an active metal, but also contributes to bonding with Ti.
- Necessary to further lower the melting point of Cu.

In addition, in this invention, the outermost surface of the outer skin material (first layer, seventh layer) and the contact surface with the Ti material of the core material (third layer, fifth layer)
The reason for using Cu material is that it is necessary to lower the melting point of Ti.

Furthermore, Ti material (4th layer), Zr material (2nd, 6th layer), and Cu material (1st layer) which constitute the composite foil brazing material of the present invention.
The reason for limiting the cross-sectional area ratio of 3.5.7 layers is that if Ti is less than 25%, Zr is less than 15%, and Cu exceeds 60%, it is difficult to react with ceramics and there is a problem that bonding cannot occur. , and Ti exceeds 40% and Zr is 30%
If Cu exceeds 30% and Cu is less than 30%, the melting point will be high, workability will be poor, and wettability to ceramics will be poor.
Undesirable.

The composite foil brazing material according to the present invention can be obtained, for example, by the following manufacturing method.

While unwinding the coiled Cu plate and unwinding the coiled Zr plate, the Zr plate is used as an intermediate layer, and while the Cu plate is pressed into a plate shape from above and below, Cu/Zr/
A three-layer Cu clad plate is produced. After that, annealing is performed.

Furthermore, the obtained coiled Cu/Zr/
While unwinding the Cu clad plate and unwinding the coiled Ti plate, the Ti plate was used as an intermediate layer and Cu/Zr
/ A 7-layer clad plate is produced by pressing the Cu land plate into a plate shape from above and below.

Thereafter, annealing and rolling are repeated to produce a composite foil brazing material having predetermined dimensions and a predetermined cross-sectional area ratio.

The composite foil brazing material of this invention has a thickness of 30 to 110 mm.
A 0p foil is suitable, and has the advantage of easily adapting to various shapes of materials to be bonded, providing excellent adhesive properties, and facilitating bonding work.

Further, by coating the composite foil brazing material of the present invention with an Ag material, the wettability to nitride ceramics can be significantly improved.

Example Zr plate with a plate thickness of 0.5 mm and a plate width of 250 mm, and a plate thickness of 0
．． While unwinding a Cu plate of 35 mm and plate width of 250 mm,
With a Zr plate as the core and a Cu plate in contact with both sides, the rolling rate was 6.
Pressure welded at 5%, plate thickness 0.42 mm, plate width 250 mm C
A three-layer clad plate of u/Zr/Cu was obtained. after that,
Diffusion annealing was performed to increase the bonding strength of the press-welded interface.

Next, a Ti plate with a plate thickness of 0.51 mm and a plate width of 250 mm, and the above-mentioned Cu plate with a plate thickness of 0.42 mm and a plate width of 250 mm.
While unwinding the Zr/Cu three-layer clad plate,
With a Ti plate as the core, 3-layer cladding plates are placed on both sides,
Press-welded at a rolling rate of 65%, plate thickness 0.47 mm, plate width 250
A 7-layer clad plate with a thickness of 7 mm was obtained.

Thereafter, the annealing and rolling process is repeated, and as shown in FIG.
3.5.7 layers of Cu are 0.009mmJ*, 250m
m width, 2.6th layer Zr thickness 0.013 mm, 250
mm width, 4th layer Ti is 0.038mm thick, 250m
A composite foil brazing material having a width of m and a thickness of 0.1 mm was obtained.

In the obtained seven-layer composite foil brazing material, the cross-sectional area ratios of the Ti material, Zr material, and Cu material were 38% for Ti material, 26% for Zr material, and 36% for Cu material.

A test piece was taken from each composite foil brazing material and had a diameter of 10 mm.
After joining two Al2O3 ceramic plates with dimensions of 15mm in diameter and 5mm in thickness and 15mm in diameter and 5mm in thickness and heated at 860°C for 10 minutes in an Ar atmosphere, as shown in FIG. A shear strength test was conducted under the condition that each sheet of ceramic was pulled in opposite directions. The results are shown in Table 2.

Also, for comparison, using Ag wax as the brazing material,
After metallizing the ceramic plate with W, an Al2O3 ceramic plate having the same dimensions as in the example was joined, and after heating at 850° C. for 5 minutes in an H2 gas atmosphere, the shear strength test was conducted. The results are shown in Table 2.

From Table 2, it can be seen that this composite foil brazing material is most suitable for brazing ceramics together.

Moreover, since it is a composite foil, it has the advantage that excellent adhesion can be easily achieved even if the bonded surface shape of the bonded material is complex.

[Brief explanation of the drawing]

FIG. 1 is a perspective explanatory view of a composite foil brazing material according to the present invention. FIG. 2 is a perspective explanatory view of a bonded material showing shear strength test conditions.

Claims (1)

[Claims] Both sides of the core Ti material are coated with C so that the outermost surface is Cu material.
It consists of a 7-layer composite material formed by covering a 3-layer material consisting of u/Zr/Cu as an outer skin material, and the cross-sectional area ratio of the Ti material, Zr material, and Cu material is as follows: Ti material: 25% to 40% Zr material A composite foil brazing material for joining ceramics, characterized in that it contains 15% to 30% Cu material and 30% to 60%.