JPH04270094A - Brazing material - Google Patents

Abstract

PURPOSE:To provide a brazing material useful for joining materials of the same or different kind among metals, alloys, and ceramics and usable for joining in vacuum or under an atmosphere. CONSTITUTION:The material is a brazing material which has a composition consisting of, by weight, 5% of one or more elements among Zr, Mg, B, and Mm (a mixture of rare earth elements) and the balance Ag and Cu and containing Ag by 0-95%. Further, the material is a brazing material in the state of paste of respective powders of <=250mum grain size.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to brazing materials. More specifically, the present invention relates to a new brazing material useful for joining similar or dissimilar metals, alloys, or ceramics.

0002

[Prior Art] Brazing has been commonly used to join materials of the same or different types such as metals, alloys, or ceramics, and a wide variety of materials have been developed for this purpose. . Among such brazing materials, for example, silver solder and phosphorous solder have been widely used for brazing, and are known as common brazing materials. These silver solders and phosphor solders are standardized by JIS, and silver solders are standardized by JISZ. 3261, and copper solder is JISZ. 32
It is summarized in 64.

0003

[Problems to be Solved by the Invention] However, although these conventional brazing materials are effective for joining metals or alloys such as copper, iron, stainless steel, and Ni-based alloys, In the case of joining ceramic materials to each other or joining metal materials to ceramic materials,
It has the drawbacks of insufficient bonding strength and poor wettability. In particular, in the case of joining metal materials and ceramic materials, there has been a problem in that the metal and ceramics react and form a brittle layer. For this reason, when joining metal-ceramics, it is necessary to coat the surface of the metal material with a dense oxide film and then perform brazing. However, it is substantially difficult to form a dense oxide film with good adhesion on the surface of a metal material, and the work is troublesome and inefficient.

On the other hand, as materials for ceramic brazing, Ag-Ti type, Ag-Ti, Cu type, Ti
, Ni-based brazing materials have been proposed, but the reality is that there are still many problems that need to be improved in actual use. This invention was made in view of the above circumstances, and it solves the drawbacks of conventional brazing materials and provides a vacuum or atmosphere brazing material useful for joining materials of the same type or different types such as metals, alloys, or ceramics. The purpose of the present invention is to provide a brazing material that can be used for bonding underneath.

[0005]

[Means for Solving the Problems] This invention solves the above problems by containing 5% by weight or less of one or more of Zr, Mg, B, and Mm (a mixture of rare earth elements), and the balance being Ag. and Cu, and contains 0 to 95% by weight of Ag.
Provided is a brazing material characterized by containing:

[0006] The brazing material of the present invention has a base of Ag.
By incorporating one or more specific active elements, namely Zr, Mg, B, and Mm (a mixture of rare earth elements) into a material consisting of Cu and Cu, it improves the wettability with ceramic materials, and improves the wettability between metal materials and ceramics. Prevent reactions with materials. This Zr, Mg, B and Mm (a mixture of rare earth elements) reacts with the ceramic to form a chemical bond. If the general content is less than 0.05%,
The bonding force is not sufficient, and if it exceeds 5%, the resulting reaction layer will become brittle, and the bonding force will be reduced. Therefore, the content of these elements is preferably 0.05 to 5
%.

On the other hand, since the base is made of Ag and Cu, it is easy to process, and it is possible to process it into any shape such as a thin plate, wire, powder, etc. The amount of Ag is 0
95% by weight. In addition, in this invention, in order to adjust the melting point, improve wettability and strength, and improve corrosion resistance, V, Cr, Co, Ni, Z
n, Pd, Cd, In, Sn, Sb, Ti, Si, P,
One or more types of Mn can be added in a total amount of 1 to 50% by weight.

For example, brazing materials having the compositions described above are easier to process than conventional brazing materials such as Ti--Ni and Ag--Ti, and as shown in Table 1, The melting point is about 600 to 800℃ (Ti-Ni is 900℃)
~1100°C), and also has the excellent characteristics of making brazing work simple and easy, and having small thermal distortion.

Furthermore, in the present invention, it is also possible to make a paste by using a powder having the above composition and mixing and kneading it with a resin and an organic solvent, or an inorganic compound flux and an organic solvent. It is. In particular, in the present invention, the paste-like brazing material contains 5% by weight or less of Ti, the balance consists of Ag and Cu, and has a composition of 0 to 95% by weight of Ag, and has a particle size of 250 μm or less. The present invention also provides a brazing material characterized in that it is made into a paste by adding and kneading a resin and an organic solvent to powder.

[0010] By forming the paste into a paste form as described above, it can be placed in a container such as a dispenser, and moreover, an appropriate amount can be automatically dispensed using air pressure or the like when used. In addition, screen printing is also possible, and printing can be done automatically where necessary. Furthermore, it is possible to simply and easily braze parts with complex shapes or minute parts.

The particle size of the powder is generally preferably 250 μm or less, as in the case of Ti,
More preferably, the thickness is about 150 μm. If it is larger than 250 μm, uniform kneading becomes difficult. In the case of screen printing, the thickness is preferably 50 μm or less. In addition, examples of resins that can be used in this case include acrylic resin, methyl cellulose, ethyl cellulose, nitrocellulose, polyimide, and polymethacrylate, and examples of organic solvents include alcohol, acetone, toluene, xylene, Examples include terpineol, butyl carbitol, and their acetates. In the case of screen printing, the thickness is preferably 50 μm or less.

On the other hand, as an inorganic compound flux, L
Chlorides such as iCl, MgCl2, H3 BO3, K2
Borates such as B4 O7 ・5H2 O, HBF4,
Borofluorides and fluorides such as NaF, bromides such as KBr, etc. can mainly be used. Such a flux has the effect of cleaning the joint surface, softening and melting at a temperature below the brazing temperature, and ensuring wettability. It also has the effect of preventing deterioration of the brazing material due to oxygen, etc. in a brazing atmosphere.

[0013]

EXAMPLES The brazing material of the present invention will be explained in more detail with reference to Examples below. Example 1, Comparative Example 1 Brazing material consisting of the composition of sample No. 3 shown in Table 1 (
(particle size of 250 μm or less) was mixed and kneaded in a solvent prepared by dissolving acrylic resin in toluene at a ratio of 8 parts powder and 2 parts solvent to form a paste.

[0014]

[Table 1]

Next, as shown in FIG. 1, after applying this paste (1) to an alumina substrate (2), a 42N layer of 20 x 40 mm square and 1 mm thick is placed on the paste (1).
The i-plate (3) was placed on the plate and held at 810° C. for 30 minutes to bond. For comparison, JI was placed on the same alumina plate.
SZ. A paste-like 72Ag-8Cu brazing material of 3621 was applied, and a 42Ni plate of the same shape was bonded thereon.

[0016] A complete joint was obtained using the brazing material of the present invention. On the other hand, when conventional brazing materials were used, cracks occurred in the joints and peeled off due to weak impacts. Example 2 Using a thin plate of a brazing material having the composition of sample No. 1 shown in Table 1, a ribbon-shaped thin plate (4
) was wound around the outer periphery of the alumina pipe (5), and the Kovar pipe (6) was fitted thereon, and then heated to 900° C. in an Ar atmosphere to join them.

[0017] No cracks or the like occurred in the joint, and the joint was completely adhered. Example 3 6 parts of acrylic resin and an appropriate amount of butyl carbitol acetate as a solvent were added to 94 parts of 100 mesh (150 μm) or less powder of Ag71%-Cu27%-Ti2% alloy, and the mixture was sufficiently kneaded to form a paste. .

Place this paste on an alumina disk,
Place an alumina pipe on top of it and heat it to 900°C in an Ar air flow.
Brazing was performed by heating at temperatures of 1000°C and 1000°C for 20 minutes. Good wetting and bonding properties were obtained under all temperature conditions. Comparative Example 2 Example 3 except for using 70% Ag-28% Cu alloy
Similar attempts were made to bond at 900° C. and 1000° C., but bonding was impossible in both cases.

Of course, the invention is not limited to the above examples. It goes without saying that various embodiments are possible with respect to details such as the chemical composition of the brazing material, the types of resins and organic solvents to be mixed and kneaded, and the types, shapes and sizes of the metal and ceramic materials.

[0020]

As described in detail above, the present invention provides a brazing material that can reliably join materials of the same or different types such as metals, alloys, or ceramics. Brazing work during joining becomes extremely simple and easy.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of joining using the brazing material of the present invention.

FIG. 2 is a sectional view showing another example of joining using the brazing material of the present invention.

[Explanation of symbols]

1 Paste brazing material 2 Alumina substrate 3 42Ni plate 4 Thin plate brazing material 5 Alumina pipe 6 Kovar pipe

Claims (5)

[Claims] Claim 1: Contains 5% by weight or less of one or more of Zr, Mg, B, Mm (mixture of rare earth elements), and the balance is Ag.
and Cu, and contains 0 to 95% by weight of Ag. [Claim 2] V, Cr, Co, Ni, Zn, Pd,
2. The brazing material according to claim 1, wherein one or more of Cd, In, Sn, Sb, Ti, Si, P, and Mn is added in a total amount of 1 to 50% by weight. 3. A brazing material characterized in that it is made into a paste by adding and kneading a resin and an organic solvent to the powder having the composition according to claim 1 or 2 and having a particle size of 250 μm or less. 4. Contains 5% by weight or less of Ti, with the balance being A.
A brazing product characterized by being made into a paste by adding and kneading a resin and an organic solvent to a powder having a particle size of 250 μm or less and having a composition of 0 to 95% by weight of Ag and Cu. material. 5. A wax characterized in that it is made into a paste by adding and kneading an inorganic compound flux and an organic solvent to the powder having the composition of claim 1, 2, 3, or 4 and having a particle size of 250 μm or less. Material for attachment.