JPS60121063A - Production of lead pin with spherical brazing filler metal - Google Patents

Abstract

PURPOSE:To manufacture easily a lead pin with a spherical brazing filler metal with which stable and high brazing strength is obtd. by making the brazing filler metal into a spherical shape and joining the sphere thereof to the lead pin at a specific temp. CONSTITUTION:A brazing filler metal consisting essentially of Ag, Au, Cu, Pd, Ni, etc. is made into a fine wire 3 which is cut to manufacture a granular piece 4. The pieces 4 are arrayed on a carbon tray and are melted by heating in a furnace kept under a non-oxidizing atmosphere. The molten pieces are solidified to obtain spheres 5 of tie brazing filler metal. A lead pin 8 is inserted into the hole 7 of a carbon jig 6 and the sphere 5 of the brazing filler metal is set at the top end thereof. The jig 6 is heated to the temp. higher than the solidus line temp. of the brazing filler metal and lower than the liquidus line temp. in the furnace kept under the non-oxidizing atmosphere and is then cooled. The sphere 5 of the brazing filler metal is securely joined to the pin 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a lead bin with a spherical brazing filler metal.

When soldering lead pins to ceramic substrates, etc.,
Using a lead pin with a solder metal attached to the tip in advance allows for better workability and enables uniform and high-quality soldering.

Conventionally, the method of attaching brazing filler metal to I and L is by using a filter.
From the viewpoint of workability, a method was adopted in which the material and the lead pin were brought into contact and melted and joined at a temperature well above the liquidus temperature.

However, the shape of melted brazing filler metal tends to vary, and when positioning it as a precision component, it is necessary to provide more clearance than necessary between the mounting jig and the lead pin, so brazing has poor positioning accuracy. The drawback was that it was difficult to get out.

In addition, it is not possible to attach the brazing material to the tip of the lead pin in a spherical shape, and as shown in Figure 1 a and b, respectively, the lead pin 1
Since the brazing material 2 spreads over the outer peripheral surface of the lead pin 1, the amount of the brazing material 2 at the tip of the lead pin 1 decreases, causing variations in the amount. As a result, when brazing to a ceramic substrate or the like, stable brazing has the disadvantage that strength cannot be obtained.

Furthermore, a wax film is formed on the outer peripheral surface of the lead pin, but if it spreads too much, it will deteriorate the surface of the post-plating.
This had the disadvantage that the lead pin's corrosion resistance deteriorated.

The present invention has been made to eliminate these drawbacks, and provides a method for manufacturing lead bins with spherical brazing filler metal that takes advantage of the advantages of the fusion bonding method and also allows the shape and size of the attached brazing filler metal to be uniform and stable. We aim to provide the following.

The method for manufacturing a lead pin with spherical brazing material of the present invention includes Ag,
It is characterized by forming a spherical filler metal whose main components are Au, Cu, Pd, Ni, etc., and joining the sphere to the lead pin at a temperature higher than the solidus temperature of the filler metal and lower than the liquidus temperature. It is something.

As described above, in the manufacturing method of the present invention, the spherical brazing material is heated at a temperature higher than the in-phase line temperature and lower than the liquidus line temperature and bonded to the lead pin. (eutectic) coexistence state, and it is bonded to the lead pin without changing its shape.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the method for manufacturing a lead pin with a spherical brazing material according to the present invention will be described below with reference to the drawings.

As shown in Fig. 2a, a wire rod with a diameter of 1.0 fin made of 15% by weight Ag-Cu alloy was drawn into a thin wire 3 with a diameter of 0.6 fin, and then cut into lengths of 0.61 mm. Granule pieces 4 are prepared, and the particle pieces 4 are arranged on a carbon tray, heated and melted at 850°C for 15 minutes in a furnace with a non-oxidizing atmosphere, and then solidified as shown in Fig. 2, with a diameter of 0.64. Ball 5 of waxed fin material was obtained. Next, as shown in FIG. 2C, a lead pin 8 made of an Fe-Ni 42% alloy with a diameter of 0.5+n and a length of 5 mm is inserted into the hole 7 of the carbon jig 6, and the brazing material is attached to the upper end of the lead pin 8. Place the ball 5 and set it.
The carbon jig 6 was heated at 830° C. for 10 minutes in a furnace with a non-oxidizing atmosphere, and then cooled, and the brazing filler metal ball 5 was firmly attached to the lead pin 8 while maintaining its shape, as shown in FIG. 2d. joined to.

However, a ball with a diameter of 0.64 m1 made of a 28% by weight Ag-Cu alloy obtained in the same manner as in the above example was placed in a glue-dobin with a diameter Q of 5 m1 and a length of 5 fins made of a 42% by weight Fe-Ni alloy. When joined in the same manner, the ball melted and the outer peripheral surface of the lead pin contained 28% by weight of A g -cu.
The alloy filler material spread and it was not possible to obtain a sphere.

Also, the heating temperature when joining the ball to the lead pin is 810°.
When similar manufacturing tests were conducted at different temperatures of C, 800°C, 790°C, and 785°C, the shape of the brazing filler metal of Ag-Cu 28% by weight alloy varied, but maintained a uniform spherical shape. It was not possible to connect it to the lead pin as it was.

In the above example, the reason why the Ag'-Cu 15% alloy brazing material was joined to the lead pin while maintaining its spherical shape is that the solidus temperature (eutectic line temperature) is 779°C and the liquidus temperature is 845°C. The brazing temperature of 830℃ is A'
This is because the solid phase of g-Cu and the liquid phase (eutectic) of Ag-Cu coexist, so the viscosity is high and the shape does not change. On the other hand, when the A g -Cu 28% alloy brazing material was joined to the lead pin, the reason why the brazing material spread over the outer circumferential surface of the lead pin is because the A g -Cu
Since the 28 wt% alloy changes directly from solid phase to liquid phase at 779°C, the viscosity decreases rapidly at temperatures above 779°C, and the shape of the brazing filler metal immediately changes, making it impossible to maintain its spherical shape. That's because there wasn't.

In the examples, a 15% by weight Ag-Cu alloy was described, but the alloy is not limited to this, and similar results can be obtained on the Cu-rich side with respect to the eutectic point. Also Ag
-Limited to Cu alloys.Alloys with a difference in liquidus temperature and solidus temperature include Au-Ag-Cu, Ag-Cu-Pd,
Any alloy such as Ag-Cu-Ni alloy may be used.

As can be seen from the above explanation, according to the manufacturing method of the present invention, it is possible to join the brazing filler metal in a spherical shape, uniform size, and in a stable state with high precision, and when brazing it to a ceramic substrate, etc., it is stable. This high degree of brazing has the excellent effect of making it possible to easily manufacture lead pins with spherical brazing material that can provide strength.

[Brief explanation of the drawing]

FIGS. 1a and 1b are diagrams showing defective conventional lead pins with brazing material, respectively, and FIGS. 2a to 2d are diagrams showing the steps of the method of manufacturing a spherical lead pin with brazing material of the present invention. 3---One thin wire, 4---One grain piece, 5------
Brazing metal ball, 6------ Carbon jig, 7---
-・Hole, 8---Lead pin. Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. (Figure 1 (Q) Figure 2) (b) (b) Ryo5 (d) QQ-

Claims (1)

[Claims] It is characterized by forming a spherical brazing filler metal whose main components are Ag, Au, Cu, Pd, Ni, etc., and joining the sphere to a lead pin at a temperature higher than the solidus temperature of the filler metal and lower than its liquidus temperature. A method for manufacturing a lead bottle with a spherical brazing filler metal.