JPH046176A - 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 Ni/Zr/Ni in such a manner that the Ni 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 Ni/Zr/Ni as a skin material in such a manner that the outermost surface is the Ni material. Further, the materials are so formed that the sectional area ratios of the Ti material, the Zr substrate and the Ni material attain 40 to 60% Ti material, 35 to 50% Zr material and 5 to 10% Ni 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 980 deg.C in brazing working temp. and, therefore, the brazing work and 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 The present invention relates to a foil-shaped composite brazing material for joining ceramics, with a Ti material as a core material and Ni/Z on both sides.
By constructing the 7-layer composite foil brazing material coated with an r/Ni outer skin material, the working temperature for brazing is relatively low at 980°C, and brazing has excellent workability 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 to be easy, we selected a combination of these materials using Ti, Zr, and Ni 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 N is coated on both sides of the Ti core material so that the outermost surface is the Ni material.
It consists of a 7-layer composite material formed by covering a 3-layer material consisting of i / Zr / Ni as an outer skin material, and the Ti material,
This is a composite foil brazing material for joining ceramics, characterized in that the cross-sectional area ratios of the Zr material and the Ni material are: Ti material: 40% to 60%, Zr material: 35% to 50%, Ni material: 5% to 10%.

The composite foil brazing material according to the present invention has good wettability with ceramics, making it ideal for brazing ceramics together, eliminating the need for a prior metallizing process on ceramics, unlike conventional Ag brazing material, and furthermore, It is a foil-shaped composite brazing material that has a relatively low working temperature of 980°C, has excellent workability, and provides high adhesive strength.

Further, the composite foil brazing material according to the present invention can join any oxide ceramics together, whether they are made of the same material or different materials.

Structure of the Invention The composite foil brazing material for ceramic bonding according to the present invention is T
Ni/Zr/N is applied to both sides of the i material as the core material.
Ni / Zr / Ni / coated with outer skin material of i
It is a 7-layer composite foil brazing material of Ti/Ni/Zr/Ni, and as shown in Figure 1, if the top layer is the first layer and the bottom layer is the 7th layer, the lamination is as shown in Table 1 below. ing.

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
This is necessary to further lower the melting point of i-Ni.

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 why the Ni material is used is that it is necessary to lower the melting point of Ti.

Furthermore, Ti material (4th layer), Zr material (2nd, 6th layer), and Ni material (1st layer) constituting the composite foil brazing material of this invention.
The reason for limiting the cross-sectional area ratio of 3.5.7 layers is that if the Ti material is less than 40%, the Zr material is less than 35%, and the Ni material is more than 10%, it is difficult to react with the ceramic and bonding is impossible. There is a problem, and the Ti material exceeds 60%, and the Zr
If the content exceeds 50% and the content of Ni material is less than 5%, the melting point will be high, workability will be poor, and wettability to ceramics will be poor, which is not preferable.

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

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

Furthermore, the obtained coiled Ni/Zr/
While unwinding the Ni clad plate and unwinding the coiled Ti plate, the Ni/Zr
/ A 7-layer clad plate is produced by pressing the Ni clad plate into a plate form 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 100 mm.
A foil with a length of 11 m 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 the Ni plate of 0.05 mm and plate width of 250 mm,
With a Zr plate as the core and Ni plates in contact with both sides, the rolling rate was 6.
Pressure-welded at 5%, plate thickness 0.21 mm, plate width 250 mm N
A three-layer clad plate of i/Zr/Ni was obtained. Thereafter, diffusion annealing was performed to increase the bonding strength of the pressure-welded interface.

Next, a Ti plate with a plate thickness of 0.42 mm and a plate width of 250 mm, and the above Ni plate with a plate thickness of 0.21 mm and a plate width of 250 mm were prepared.
While unwinding the Zr/Ni 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 0.295 mm, plate width 25
A 7-layer clad plate with a thickness of 0 mm was obtained.

Thereafter, the annealing and rolling process is repeated, and as shown in FIG.
3.5.7 layer of Ni is 0.002mmJFlj: Mi, 2
50mm width, 2.6th layer Zr thickness 0.021mm,
250mm wide, 4th layer Ti 0.05mm thick, 25
A composite foil brazing material having a width of 0 mm and a thickness of 0.1 mm was obtained.

In the obtained seven-layer composite foil brazing material, the cross-sectional area ratios of Zr material, Ti material, and Ni material were as follows: Ti material: 50%, Zr material: 42%, Ni material: 8%.

A test piece was taken from each composite foil brazing material and had a diameter of 10 mm.
It was interposed between two Al2O3 ceramic plates measuring 15mm in diameter and 5mm in thickness, and heated at 980°C for 10 minutes in an M atmosphere to join them.
As shown in FIG. 2, a shear strength test was conducted under the condition that two ceramic sheets were 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.

Table 2 Also, since it is a composite foil, it has the advantage that excellent adhesion can be easily achieved even if the bonding 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 diagram of a bonded material showing shear strength test conditions.

Claims (1)

[Claims] N is coated on both sides of the Ti core material so that the outermost surface is Ni material.
It consists of a 7-layer composite material formed by covering a 3-layer material consisting of i/Zr/Ni as an outer skin material, and the cross-sectional area ratio of the Ti material, Zr material and Ni material is as follows: Ti material: 40% to 60% Zr material A composite foil brazing material for joining ceramics, characterized in that it contains 35% to 50% Ni material and 5% to 10% Ni material.