JPH08283019A - Silver-base composite tape and its production - Google Patents

Abstract

PURPOSE: To obtain an excellent high-temp. strength by sintering and oxidizing a silver alloy powder as a core and a silver powder as a clad, compressing the powders into the tape, removing the silver layer on one side and forming a silver layer as the outer lower face and an oxide-dispersed silver substrate layer as the inner upper face. CONSTITUTION: A compact with an about 100-mesh silver alloy powder of Ag- MgO, etc., as a core and an about 100-mesh silver powder as a clad is sintered and oxidized at 800-850 deg.C in the atmosphere. The sintered compact is compressed, extruded into wire and then rolled into tape, and then the silver on the outer upper face is cut off. The intermediate is further rolled to obtain a silver-base composite tape 8 having specified width and thickness, with a silver layer 6 having t1 (μm) thickness as the outer lower face, a silver layer 6' on the outer lower face on both left and right sides and an oxide-dispersed silver substrate layer 7 having t2 (μm) thickness and wherein 0.005-1.5wt.% >=1 kind among the oxides of Mg, Ni, Ti, Zr, Sn, Y, Hf, Ca, etc., are dispersed as the inner upper face, where t1 /t2 =1/10 to 1/2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silver-based composite material tape having suitable strength and electrical conductivity for processing difficult-to-process materials such as ceramics and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, oxide powders such as Al, Ti,
The oxide powders of Mg, Sr, Y, and Sn and their composite oxides were difficult to sinter, were brittle when sintered, and could not be plastically processed as they were. Therefore, there is a method of coating with a tape such as Ag and processing, but the sintering temperature is 800 ° C.
Since it is as high as ~ 900 ° C, due to the difference in workability from the softened coating Ag, it stretches and breaks when tension is applied during processing.
Therefore, improvement in tensile strength is desired.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention provides a silver-based composite having material strength at high temperature and electrical conductivity that can follow even if a difficult-to-machine material such as ceramics is coated and integrally processed. An object of the present invention is to provide a material tape and a manufacturing method thereof.

[0004]

The silver-based composite tape of the present invention for solving the above problems comprises a silver layer on the outer lower surface and an oxide-dispersed silver base material layer on the inner upper surface. The oxide-dispersed silver base layer contains silver, Mg, Ni, Ti, Zr, Sn,
It is preferable to add at least one oxide of Y, Hf, and Ca. The total amount of this oxide added is 0.0
It is preferably from 05 to 1.5 wt%. The thickness t ₂ of the thickness t ₁ of the silver layer oxide dispersion silver base layer, t ₁ / t ₂ = 1 /
It is preferably 10 to 1/2. One of the methods for producing a silver-based composite tape of the present invention is one in which silver alloy powder is used as a core material, and silver powder is used as a jacket material, which is sintered and oxidized in the atmosphere, then compressed, extruded, and then It is characterized in that it is processed into a tape and the silver layer on one side is removed to prepare a silver-based composite tape having an outer lower surface made of a silver layer and an inner upper surface made of an oxide-dispersed silver base material layer. Another method for producing a silver-based composite tape according to the present invention is a method in which silver alloy powder is used as a core material, silver powder is used as a jacket material, vacuum sintering is performed, extrusion processing is performed, and then vacuum sintering is performed. Extrusion is repeated a required number of times, then processed into tape, the silver layer on one side is removed to form the silver layer on the outer lower surface and the silver alloy layer on the inner upper surface, and then oxidized to disperse the silver alloy layer in the oxide. It is characterized in that a silver-based composite tape is produced as a silver base layer. Still another one of the methods for producing a silver-based composite tape of the present invention is to use silver oxide powder as a core material, silver powder as a jacket material, sinter in air or vacuum, and then extrude. Then, the above-mentioned sintering and extrusion processes are repeated a required number of times, and thereafter the tape is processed, the silver layer on one side is removed, and the outer lower surface is a silver layer and the inner upper surface is an oxide-dispersed silver base material layer. It is characterized by making material tape. Another one of the methods for producing the silver-based composite tape of the present invention is to extrude a silver alloy rod as a core material and a silver pipe as an outer coating material, and then process the tape to form a silver layer on one side. And then oxidized to form the silver alloy layer on the inner upper surface as an oxide-dispersed silver base material layer to prepare a silver-based composite tape. In the oxide-based silver base material layer of the silver-based composite tape, the amount of oxide added is preferably 0.005 to 1.5 wt% because it is used as a material for coating difficult-to-process materials such as ceramics. To increase the high temperature strength, if it is less than 0.005 wt%, there is no barrier effect as a coating material, and if it exceeds 1.5 wt%, the workability and electrical conductivity are reduced and the prescribed high temperature strength cannot be obtained. Also, the thickness t of the silver layer of the silver-based composite tape is
₁ and the thickness t _{2 of the} oxide-dispersed silver base layer are t ₁ / t ₂ =
The reason why it is preferable to be 1/10 to 1/2 is that if it is less than 1/10, the thickness t ₁ of the silver layer is thin and it does not serve as a barrier for difficult-to-process materials such as ceramic powder coated during use. This is because if it exceeds 2, the oxide-dispersed silver base material layer t ₂ is thin and a predetermined strength cannot be obtained.

[0005]

The silver-based composite tape of the present invention having the above-mentioned structure has an oxide-dispersed silver base material layer on the inner upper surface, and thus has high temperature strength, particularly high tensile strength, and has a silver layer on the outer lower surface.
This silver layer serves as a barrier when a difficult-to-process material such as ceramics is coated. Therefore, it can be integrally processed with a difficult-to-machine material such as ceramics, and the covering material is hardly softened or deformed at that time. Further, according to the method for producing a silver-based composite tape of the present invention, no cracks are generated in the oxide-dispersed silver base material layer of the silver-based composite tape, and the oxide is finely dispersed at high temperature. It is possible to easily and efficiently manufacture a silver-based composite tape having excellent material strength and high electric conductivity.

[0006]

EXAMPLES Examples of the silver-based composite tape and the method for producing the same according to the present invention will be described. First, the first embodiment will be described. As shown in FIG. 1, 100-mesh silver powder is used as the jacket material 1, and 100-mesh Examples 1 to 1 in Table 1 below.
As shown in FIG. 2, the silver alloy powder of No. 5 is used as the core material 2, and is sintered and oxidized at 800 to 850 ° C. in the air as shown in FIG. Wire rod 4 with an outer diameter of 15 mm
Then, this wire 4 was rolled to form a tape 5 having a width of 20 mm and a thickness of 1.5 mm as shown in FIG. 20 mm wide and 50 μm thick as shown, with an outer lower surface 10 μm thick
A silver-based composite tape 8 comprising a silver layer 6 ′ having a thickness of 100 μm on the left and right outer surfaces and an oxide-dispersed silver base material layer 7 having a thickness of 40 μm on the inner upper surface was obtained. Explaining the second embodiment, as shown in FIG.
As a core material 2, the 100-mesh silver alloy powders of Examples 6 to 10 in Table 1 below are used as the core material 2 in a vacuum of 400 to 6
Sintered at 00 ° C. to form a molded body 9, which is then extruded into a wire rod 10 having an outer diameter of 15 mm as shown in FIG. In width 25
After forming the tape 11 having a thickness of 1.5 mm and a thickness of 1.5 mm, silver on the outer upper surface and both side surfaces is removed by cutting, and further rolled to form a silver layer 6 having a thickness of 5 μm on the outer lower surface and an inner upper surface as shown in FIG. 45 μm
Tape 13 composed of the silver alloy layer 12 and then the tape 13 was oxidized in the air at 800 to 850 ° C. to transform the silver alloy layer 12 into an oxide-dispersed silver base layer 14 as shown in FIG. Thus, a silver-based composite tape 15 was obtained. A third embodiment will be described with reference to FIG.
As shown in 12, 100 mesh silver powder is used as the jacket material 1,
As shown in FIG. 13, a 100-mesh silver oxide powder of Examples 11 to 15 in Table 1 below was used as a core material 16 in vacuum at 400 to 600 ° C.
Sintered to form a molded body 17, and this molded body 17 is extruded to form a wire rod 18 having an outer diameter of 15 mm as shown in FIG. 14, and then rolled to have a width of 25 mm and a thickness of 1.5 mm as shown in FIG. After forming the tape 19 of mm, silver on the outer upper surface and both side surfaces is removed by cutting and further rolled, as shown in FIG. 16, a silver layer 6 having a width of 20 mm and a thickness of 50 μm and an outer lower surface having a thickness of 7 μm, A silver-based composite tape 15 having an oxide-dispersed silver base layer 14 having an inner upper surface having a thickness of 43 μm was obtained. Explaining the fourth example, as shown in FIG. 17, a silver pipe is used as the jacket material 21, and examples 16 to 20 in Table 1 below.
As the core material 20 of the silver alloy rod of, the core material 20 is extruded to form a wire material 22 having an outer diameter of 15 mm and a core material 20 'of an outer diameter of 10 mm, and then the wire material 22 is rolled and chamfered. , Molded by rolling,
As shown in Fig. 19, the width is 20 mm, the thickness is 50 μm, and the outer bottom surface is thick.
A tape 13 comprising a 15 μm silver layer 6 and a 35 μm thick silver alloy layer 12 on the inner upper surface was prepared.
By oxidizing at 800 to 850 ° C., the silver alloy layer 12 was made into the oxide-dispersed silver base material layer 14 as shown in FIG. 20 to obtain a silver-based composite tape 15. The tensile strengths of the thus obtained silver-based composite tapes of Examples 1 to 20 and the conventional silver tape having a width of 20 mm and a thickness of 50 μm at 600 ° C. were measured and as shown in the right column of Table 1 below. I got the result.

[0007]

[Table 1]

As is clear from the results in the right column of Table 1, it is understood that the silver-based composite tapes of Examples 1 to 20 are superior in tensile strength at high temperature to the conventional silver tapes.

[0009]

As can be seen from the above description, the silver-based composite tape of the present invention is excellent in high temperature strength, especially tensile strength.
It is possible to coat difficult-to-machine materials such as ceramics and perform integral processing at high temperatures, and at that time, the silver-based composite tape, which is a covering material, is extremely unlikely to be softened or deformed. Further, according to the method for producing a silver-based composite tape of the present invention, it is possible to easily and efficiently produce a silver-based composite tape having excellent material strength at high temperatures and high electric conductivity as described above.

[Brief description of drawings]

FIG. 1 is a diagram showing steps of an embodiment of a method for producing a silver-based composite material tape of the present invention.

FIG. 2 is a diagram showing steps of an embodiment of a method for producing a silver-based composite material tape of the present invention.

FIG. 3 is a diagram showing steps of an embodiment of a method for producing a silver-based composite material tape of the present invention.

FIG. 4 is a diagram showing steps of an embodiment of a method for producing a silver-based composite material tape of the present invention.

FIG. 5 is a diagram showing steps of an example of a method for producing a silver-based composite tape of the present invention.

FIG. 6 is a diagram showing steps of another embodiment of the method for producing a silver-based composite material tape of the present invention.

FIG. 7 is a diagram showing steps of another embodiment of the method for producing a silver-based composite material tape of the present invention.

FIG. 8 is a diagram showing steps of another embodiment of the method for producing a silver-based composite material tape of the present invention.

FIG. 9 is a diagram showing steps of another embodiment of the method for producing a silver-based composite material tape of the present invention.

FIG. 10 is a diagram showing steps of another embodiment of the method for producing a silver-based composite material tape of the present invention.

FIG. 11 is a diagram showing steps of another embodiment of the method for producing a silver-based composite material tape of the present invention.

FIG. 12 is a diagram showing steps of yet another embodiment of the method for producing a silver-based composite tape of the present invention.

FIG. 13 is a diagram showing steps of yet another embodiment of the method for producing a silver-based composite material tape of the present invention.

FIG. 14 is a diagram showing steps of still another embodiment of the method for producing a silver-based composite material tape of the present invention.

FIG. 15 is a diagram showing steps of still another embodiment of the method for producing a silver-based composite material tape of the present invention.

FIG. 16 is a diagram showing steps of yet another embodiment of the method for producing a silver-based composite material tape of the present invention.

FIG. 17 is a diagram showing steps of another embodiment of the method for producing a silver-based composite material tape of the present invention.

FIG. 18 is a diagram showing steps of another embodiment of the method for producing a silver-based composite material tape of the present invention.

FIG. 19 is a diagram showing steps of another embodiment of the method for producing a silver-based composite tape of the present invention.

FIG. 20 is a diagram showing a process of another example of the method for producing a silver-based composite material tape of the present invention.

[Explanation of symbols]

 1 outer coating material 2 core material 3 molded body 4 wire rod 5 tape 6, 6'silver layer 7 oxide-dispersed silver base material layer 8 silver-based composite tape 9 molded body 10 wire rod 11 tape 12 silver alloy layer 13 tape 14 oxide Dispersed silver base layer 15 Silver-based composite tape 16 Core material 17 Molded body 18 Wire material 19 Tape 20, 20 'Core material 21 Outer coating material 22 Wire material

Claims (8)

[Claims] 1. A silver-based composite tape having an outer lower surface comprising a silver layer and an inner upper surface comprising an oxide-dispersed silver base material layer. 2. An oxide-dispersed silver base layer comprising silver containing Mg and N.
The silver-based composite tape according to claim 1, wherein at least one oxide of i, Ti, Zr, Sn, Y, Hf, and Ca is added. 3. The total amount of oxide added is 0.005 to 1.5 wt.
%, And the silver-based composite tape according to claim 1 or 2. Claims wherein the thickness t ₁ of the silver layer and the thickness t ₂ of the oxide dispersion silver substrate layer, characterized in that it is a _{t 1 / t 2 = 1 /} 10~1 / 2 4. The silver-based composite tape according to any one of 1, 2 and 3. 5. A silver alloy powder is used as a core material, and a silver powder is used as a jacket material, which is sintered and oxidized in the atmosphere, then compressed, extruded and then processed into a tape to remove the silver layer on one side. A method for producing a silver-based composite tape, characterized in that a silver-based composite tape having an outer lower surface and an inner upper surface made of an oxide-dispersed silver base material layer is thereby produced. 6. A silver alloy powder as a core material and a silver powder as a jacket material, vacuum sintered, then extruded, then vacuum sintered and extruded a required number of times, and then processed into a tape. ,
By removing the silver layer on one side, the outer lower surface becomes a silver layer and the inner upper surface becomes a silver alloy layer, which is then oxidized to form the silver alloy layer as an oxide-dispersed silver base material layer to form a silver-based composite tape. A method for producing a silver-based composite tape, which comprises producing the tape. 7. A silver oxide powder is used as a core material, and a silver powder is used as a jacket material and sintered in air or in vacuum, and then extruded, and then the sintering and extrusion are repeated a required number of times. A silver-based composite tape characterized by being processed into a rear tape and removing a silver layer on one side to produce a silver-based composite tape having an outer lower surface made of a silver layer and an inner upper surface made of an oxide-dispersed silver base material layer. Manufacturing method. 8. A silver alloy rod as a core material, a silver pipe as an outer coating material, extruded, and then processed into a tape to remove a silver layer on one side, and then oxidized to form a silver alloy on the inner upper surface. A method for producing a silver-based composite tape, comprising forming a silver-based composite tape by forming the layer as an oxide-dispersed silver base layer.