JPS62144896A - Brazing filler metal - Google Patents

Abstract

PURPOSE:To provide a brazing filler metal which is highly resistant to heat and corrosion, decreases the erosion of base metals and is low in cost by forming the brazing filler metal of the compsn. contg. respectively specific ratios of Au, B, Cr, Si and the balance Ni thereby forming the brazing filler metal for stainless steels and Ni alloys. CONSTITUTION:This brazing filler metal is made of the compsn. consisting of 1-50% Au, 0.5-7% B, 0.5-15% Cr, 0.5-10% Si, and the balance Ni. At least one kind of Fe or Co is further incorporated at 0.5-7% into said compsn. This brazing filler metal is ejected onto the surface of a rotating metallic body or to a rotating liquid so as to be formed into a plate or fine wire-shape or is ejected by water or inert gas so as to be formed into the form of powder. The low-cost brazing filler metal having the performance of the brazing part equiv. to the performance of a brazing filler metal BAu-4 is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a brazing material suitable for brazing metal parts, particularly for brazing stainless steel, nickel alloys, etc.

(Prior art and its problems) Conventionally, J was used for brazing stainless steel, nickel alloy, etc.
IS Z3266 BAu-4 braze was used. The brazing joint obtained with this brazing filler metal is
It has features such as heat resistance, corrosion resistance, and less base material erosion that cannot be obtained with other brazing materials such as nickel brazing, palladium brazing, and limited brazing.

However, the components of BAu-4 are Au82%-NilB
%, and since the wax component contains a large amount of expensive Au, there is a problem that the cost is high.

(Object of the Invention) An object of the present invention is to provide a brazing filler metal that has characteristics such as heat resistance, corrosion resistance, and less base metal erosion that are equal to or higher than those of BAu-4 brazing filler metal, and is also low in cost. It is something.

(Means for Solving the Problems) One of the present inventions for solving the above problems is that the weight ratio of Au is 1 to 50%, 80.5 to 7%, and Cr is 0.5 to 15%.
This is a brazing material consisting of 0.5 to 10% Si and the balance Ni, and the other one of the present invention is a brazing material consisting of 1 to 50% Au and Bo by weight ratio.
, 5-7%, Cro, 5-15%, Si0.5-10
%, at least one of Fe and Co in an amount of 0.5 to 7%, and the balance being Ni.

The reason why the brazing material of the present invention contains Au is that Ni
When alloyed with nickel alloy stainless steel, the melting point lowers and the difference between liquidus and in-phase temperatures can be reduced, improving the fluidity of the solder.Also, unlike nickel-alloyed stainless steel, brazing can sometimes cause erosion of the base material. This is because there is little, and when its content increases,
Brazing increases the ductility, corrosion resistance, and oxidation resistance of the joint, but if it is less than 1%, it has no effect, and if it exceeds 50%, the cost increases, and brazing reduces the strength of the joint. Therefore, the content was set at 1 to 50%.

B has the function of forcibly reducing surface oxides of the joint base material and improving wettability during brazing,
If the content is less than 0.5%, the above effects cannot be obtained,
If it exceeds 5%, the strength of the brazed joint will deteriorate and the diffusion layer will become thicker, so the content was set at 0.5 to 5%.

Cr is effective in improving corrosion resistance and high temperature strength, and
．． If it is less than 5%, the effect will not appear, and if it exceeds 15%, the melting point will increase and the workability of brazing will deteriorate, so 0.5
The content was set at ~5%.

Si is effective in improving the fluidity and wettability of the solder, and is also effective in lowering the melting point of the solder and forcibly reducing surface oxides on the joint base material. If the brazing effect exceeds 10%, the strength of the joint decreases, so the content was set at 0.5 to 15%.

Ni is the main component of the soldering material of the present invention, and it improves the wettability of the solder,
Brazing is effective in improving corrosion resistance and heat resistance, and brazing is also effective in improving the toughness of joints.

Fe and Co are effective in improving the wettability with the base material without reducing the strength of the brazing filler metal.If it is less than 0.5%, the effect will not appear, and if it exceeds 7%, the melting point of the brazing material will decrease. The content was set at 0.5 to 7% because the wettability of the wax deteriorated.

(Example) First, an example of the brazing filler metal of the first invention will be described. The brazing filler metal of Example 1 with the component composition and melting point shown in the left column of Table 1 below was melted by high-frequency induction heating in an Ar gas atmosphere using an aluminum crucible, and when the melting point reached 150°C higher than the melting point, The molten metal was poured onto one roll with a diameter of 2 mm to form a tape with a thickness of 0.2 mm and a width of 10 mm. The brazing material of Example 2 was melted by high-frequency induction heating in an Ar gas atmosphere using an aluminum crucible, and the melting point was 15
When the temperature reached 0"C, it flowed out onto the rotating inner surface of a drum roll filled with water and formed into a thin wire with a diameter of 0.5 mm. The brazing material in Example 3.4.5 was made of aluminum. Using a pot, melt by high-frequency induction heating in an Ar gas atmosphere, and when the temperature reaches 150°C higher than the melting point, use an atomizer to make a powder, sieve this powder, and
The following powder is used as a genuine brazing material.

The brazing filler metals of Examples 1 to 5 and the conventional example B-Au-4 (
5US using a soldering pad of 82% Au-18% Ni
410 was brazed in a furnace in an Ar gas atmosphere, and the oxidation penetration depth of the brazed parts was measured after heating at various temperatures in the air for 960 hours, as shown in the right column of Table 1 below. Got the results.

(Left below) Also, using these Examples 1 to 5 and the conventional brazing filler metal, 5US304 was heated in H2 for 60 minutes at a melting point of +50°C.
After brazing, the depth of the diffusion layer in the brazed area was measured, and the results shown in Table 2 below were obtained.

Table 2 Furthermore, using Examples 1 to 5 and the conventional brazing filler metal, S,
The shear strength of the brazed joint made of US304 and the brazed joint made of Coinel 600 at high temperatures were measured, and the results shown in Table 3 below were obtained.

As is clear from Table-1, Table-2, and Table-3 above, the brazing filler metal of the embodiment of the first invention has a 5U
S410 brazing has approximately the same partial oxidation penetration depth, 5
The diffusion layer of US304 brazing is extremely large, 5U
It can be seen that the shear strengths of S304 and Coinel 600 at high temperatures are equivalent or higher.

Next, an example of the brazing filler metal of the second invention will be described. The brazing filler metal of Example 6.7 with the composition shown in the left column of Table 4 below was melted by high-frequency induction heating in an Ar gas atmosphere using an aluminum crucible, and when the temperature reached 150°C higher than the melting point, The molten metal flows out onto one roll with a diameter of 2 mm to a thickness of 0.
The tape is 2mm long and 10m++ wide. In addition, the brazing filler metal of Example 8.9 was melted by high-frequency induction heating in an Ar gas atmosphere using an aluminum crucible, and the melting point was 15
When the temperature rose to 0°C, the water flowed out onto the rotating inner surface of a drum roll filled with water, forming a thin wire with a diameter of 0.5 mm. Example 10.11.12.13.14.15
The brazing filler metal is melted by high-frequency induction heating in an aluminum crucible in a gas atmosphere, and when it reaches a temperature 150°C higher than the melting point, it is made into powder using an atomizer, and this powder is sieved to form a powder with a diameter of 150 μm. The following powder was used as the main brazing material. Using the soldering materials of Examples 6 to 15 and the conventional brazing material of BAu-4 (82% Au-18% Ni), 5US410 was heated in an Ar gas atmosphere. The oxidation penetration depth of the brazed parts was measured after being heated in the air at various temperatures for 960 hours, and the results shown in the left column of Table 4 below were obtained.

(Leaving space below) In addition, using these Examples 6 to 15 and the conventional brazing filler metal, 5US304 was brazed with melting point + 50"(4'60 minutes at H2 city), and the brazing When the depth was measured, the results shown in Table 5 below were obtained.

Table 5 Furthermore, using Examples 6 to 15 and the brazing filler metal of the conventional example, the brazing of SUS 304 is a joint, and the brazing of Coinel 600 is a joint in high temperature. When the shear strength was measured, the results shown in Table 6 below were obtained.

(Left below) As is clear from Tables 4, 5, and 6 above, the brazing filler metal of the embodiment of the second invention is 5U larger than the brazing filler metal of the conventional example.
S410 brazing has approximately the same partial oxidation penetration depth, 5
The diffusion layer of US304 brazing is extremely large, 5U
It can be seen that the shear strengths of S304 and Inconel 600 at high temperatures are equivalent or higher.

(Effects of the Invention) As detailed above, the brazing filler metal of the present invention is different from conventional BAu-4.
Brazing with high-temperature shear strength equal to or higher than that of brazing filler metal can produce joints with excellent heat resistance, and brazing with a large diffusion layer can produce joints with superior heat resistance. There is less corrosion, and oxidation '/l M depth brazing can provide joints with excellent corrosion resistance.Furthermore, the Au content is significantly lower than that of BAu-4 brazing filler metal, resulting in lower cost. Therefore, it can be said to be an epoch-making product that can replace the conventional 5Au-4 brazing material.

Claims (1)

[Claims] 1) Weight ratio of Au1 to 50%, B0.5 to 7%, Cr0
．． A brazing filler metal consisting of 5 to 15% Si, 0.5 to 10% Si, and the balance Ni. 2) Weight ratio of Au1 to 50%, B0.5 to 7%, Cr0
．． A brazing material consisting of 5 to 15% Si, 0.5 to 10% Si, 0.5 to 7% of at least one of Fe and Co, and the balance Ni. 3) The brazing filler metal according to claims 1) and 2), characterized in that the molten metal is injected onto the surface of a rotating metal body and formed into a thin plate shape. 4) Claims 1) and 2) characterized in that the molten metal is ejected into a rotating liquid and formed into a thin wire shape.
Brazing filler metal as described in section. 5) The brazing filler metal according to claims 1) and 2), wherein the molten metal is formed into a powder by being injected into water or an inert gas.