JPS58128293A - Thin strip of phosphorus copper brazing filler metal - Google Patents

Abstract

PURPOSE:To provide a thin strip of phosphorus copper brazing filler metal which has ductility and flexibility, permits blanking and is usable for replaced brazing by cooling and solidifying the melt of phosphorus copper brazing filler metal contg. P and Ag respectively at prescribed ratios and consisting of the balance Cu directly quickly to a thin crystalline strip of a specific thickness. CONSTITUTION:Phosphorus copper brazing filler metal contg. 4.5-5.5wt% P, and 14.5-15.5wt% Ag and consisting of the balance Cu is prepared. On the other hand, a crucible 4 having a heater 2 around the same and provided with a nozzle 3 at the bottom end is disposed on a metal roll 1 which rotates in an arrow direction. The melt 5 of the above-described phosphorus copper brazing filler metal is charged into the crucible 4, and gaseous pressure is acted upon the molten metal surface in the crucible 4 to eject the melt 5 onto the surface of the roll 1 from the nozzle 3, whereby the melt 5 is cooled directly and a thin crystalline strip 6 of 15-70mu thickness is manufactured. An inert gas such as gaseous Ar which does not react with the melt 5 is used for the gaseous pressure to be acted upon the melt surface in the crucible 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has ductility and flexibility, can be stamped,
This relates to 1) a copper solder ribbon that can be used for installation.

General phosphor copper solder is cheaper than other copper solders and can be brazed in the atmosphere without using flux, so it can be used to join various parts made of copper or copper alloys, such as ensuring airtightness and joining of steel pipes. It is widely used in the assembly of electrical equipment, etc., and is standardized as JIS-Z-3264.

Time 1: P4.8-5, which is called BcuP-5
．． 3wt% (hereinafter wt% is simply abbreviated as %), Ag 14
．． Phosphorus copper solder, which is composed of 5% to 15.5% Cu with the balance being Cu, has excellent properties in terms of spreadability, strength when brazing, and temperature when brazing, and is suitable for complex parts and precision assembly. It is expected that the government will try to establish the following.

Brazing brazing is generally used by stamping thin strips into shapes, and has the advantage that it has raw properties and can improve the reliability of brazing. However, the above B
CuP-5 contains a large amount of P, so Cu3P is brittle at room temperature.
Because a large amount of phases are formed, plastic working at room temperature is difficult and it is impossible to form into a thin ribbon. In addition, since BCuP-5 is difficult to process at room temperature even as a regular wax ladle, it is manufactured by repeating hot working or intermediate annealing and cold working, but this increases the number of processing steps and increases production costs. Not only does it have the disadvantage of high ductility, but also its ductility and flexibility are reduced, making it impossible to punch and process, making it unsuitable for use in soldering.

The present invention has been developed as a result of various researches in view of this problem, and has developed a phosphor-brazed thin strip that is easy to manufacture, has ductility and flexibility, can be punched, and can be used for placement. , P4,5-55% and Ag 14.5-15.5
%, and the balance is Cu, is directly rapidly solidified to form a crystalline ribbon having a thickness of 15 to 70 fi.

That is, as a result of various studies, the present invention has found that phosphorous copper solder In, which contains 4.5 to 5.5% P, 14.5 to 155% Ag, and the balance is Cu, is directly quenched and solidified to elute. Despite the fact that the crystalline ribbon with a thickness of 15 to 70 μm is designed to be rapidly cooled, it has considerable tactility and flexibility,
It was discovered that punching was possible, and a soldered copper thin strip was obtained.

Therefore, melt #J is directly rapidly solidified to a thickness of 15 to 70 μm.
The reason why the crystalline ribbon is made is because if the thickness is less than 15 μm, the ribbon formation becomes unstable, and it is not attractive as a brazing material. Also, if the thickness exceeds 70 μm, it becomes ductile. This is because the flexibility makes it impossible to perform die cutting using a low die.

The phosphor brazing ribbon of the present invention is a crystalline ribbon with a thickness of 15 to 70μ, has ductility and flexibility, can be punched, and can be used for placement11, basically. It is created as follows.

That is, as shown in Fig. 1, a metal roll (1) that rotates in the direction of the arrow has a heater (2) around it, and a nozzle (3) at its lower end. The provided crucible (4) is placed, the molten metal (5) of phosphor wax is charged into the crucible (4), gas pressure is applied to the surface of the molten metal in the crucible (4), and the nozzle (3)
Spouting the molten metal (5) onto the surface of the roll (1) through the
The molten metal is directly cooled on the surface of the roll ("l") to form a crystalline ribbon (6). Alternatively, as shown in Fig. 2, a pair of metal rolls ("l" Enter (1
b) Surrounding heater (2) to improve contact? have,
A crucible (4) with a nozzle (3) provided at the lower end is arranged, a molten metal (5) of phosphor copper solder is charged into the crucible (4), and a gas pressure is applied to the surface of the molten metal in the crucible (4). Let me roll (1
The molten metal is spouted onto the contact surfaces of a) and (lb), and both rolls (
The molten metal is rapidly solidified on the contact surfaces of 1a) and 1b to form a crystalline ribbon (6). .

In this way, the shape of the nozzle for the circumferential speed of the roll.

By adjusting the dimensions, gas pressure applied to the bath water surface, etc.
Unexploded I with a thickness of 15-70μ! l:ll) A thin copper solder ribbon can be easily obtained.

As the metal roll, a roll made of Cu alloy or various steels may be used, and the radius of curvature and rotational speed of the roll may be controlled so that the circumferential speed is 0.2% ec or more. Further, the crucible should be one that does not react with the molten metal, such as a graphite crucible, quartz crucible, or aluminum crucible. The nozzle provided at one end of the crucible may be, for example, a slit-shaped nozzle with a radius of 0.2 to 1.5 mm, or a slit nozzle with a radius of 0.2 to 1.5 mm, depending on the shape and size of the ribbon to be cooled and solidified. It is possible to select and form a round hole nozzle within a range of 5 m. As the gas pressure applied to the surface of the molten metal in the crucible, inviscid gas such as At gas or N2 gas, which does not react with the molten metal, may be used.

5- ゛ The present invention) Copper solder ribbon? An example will be explained.

2. By the method shown in the figure (hereinafter referred to as F method A) and the method shown in Figure 2 (hereinafter referred to as F method B), P5.1%, Ag
A phosphorous brazing ribbon consisting of 14.9% Cu and the balance Cu was produced. The metal roll was made of heat-resistant steel, the crucible was made of quartz glass, and the molten metal was rapidly solidified under the cooling conditions shown in Table 1 to produce a phosphorous brazing ribbon. .

The bending workability and punching workability of these thin strips were investigated. These results are shown in Table 1-2.

Bending workability (C) For the two cases, thin strips and rings are punched out, and those with no cracking are marked with a circle as having good punching workability, while those with cracking are marked with poor punching workability. It is represented by an X mark. Regarding the bending properties, there is no hidden bending in the longitudinal direction and bending angle of the thin strip, those with good bending are marked with ○, and those with impossible bending are marked with x. and those in between are represented by Δ marks.

7- Direct cooling solidification from molten metal as seen in Table 1 8- In, + Li -1-+ I: g
+ yh, c pregnancy e brb
1) Copper solder 41-49 has excellent bendability and punching workability 1) and can be used for mounting.

Comparison I) Copper solder with a thickness of 70 JJa
It can be seen that 610 and All have deteriorated both in bendability and punching workability, and cannot be used for placing.

In this way, the phosphor brazing thin strip of the present invention (- has more flexibility, can be punched, and is easier to manufacture than the expensive Agyir), which contains a large amount of brazing material. It can be used as a substrate with a wall thickness of several tens of microns (1), and has significant industrial effects, such as reducing the amount used.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the method for manufacturing 6) copper solder according to the present invention;
FIG. 2 is an explanatory diagram showing another method of manufacturing copper solder. 1. Metal roll 2. Heater 3. Nozzle 9
- 4, crucible b, 硲1#! +t) 1 chapter crystal sacrifice emperor -10
- Figure 1 Figure 2

Claims (1)

[Claims] (11P4.5-5.5wt% and Ag 14.5-15
．． 5 wt%, the molten copper solder is made of Cu, and is made of a crystalline thin ribbon with a thickness of 15 to 70 μm that is directly quenched and solidified. It has ductility and flexibility, and can be punched. Copper solder ribbon. +21 1. A copper solder ribbon according to claim 1, wherein a molten copper solder is jetted onto a rotating metal body to form a crystalline ribbon.