CN103056552B - Novel lead-free copper alloy material for welding and preparation method thereof - Google Patents

Abstract

The invention discloses a new lead-free copper alloy material for welding and a preparation method thereof. The mass percentages of each component of the new lead-free copper alloy material for welding are: tin 13-15%; manganese 0.5-1.5% ; Zinc 16-18%; the balance is copper. The new lead-free copper alloy material of the present invention not only guarantees the performance of the original traditional welding material, but also replaces the lead element to meet the ROHS requirements; the addition of manganese element can achieve the purpose of preventing zinc oxidation, greatly reducing the cost of materials and at the same time The stability of the welding carrier is improved, and the service life of the welding carrier is prolonged.

Description

A new lead-free copper alloy material for welding and its preparation method

technical field

The invention relates to the technical field of manufacturing welding materials, in particular to a new lead-free copper alloy material for welding and a preparation method thereof.

Background technique

There are generally two types of soldering materials on the market: one is tin-silver-copper alloy, and the other is tin-lead-copper alloy. With the implementation of the "Restriction of Hazardous Substances (ROHS)" (Restriction of Hazardous Substances, ROHS) ban on lead in the electronics industry, lead-containing solder materials can no longer meet high standards. Environmental requirements. The difficulty in the application of tin-silver-copper alloys is not only that the temperature of the soldering furnace is 30 degrees higher than that of the original lead alloy, but also its cost is 25% higher than that of the tin-lead-copper alloy. More importantly, the increase in temperature will greatly reduce the exposed components. stability. Therefore, tin-zinc alloys were further studied. However, the oxidation of zinc prevents the application of tin-zinc alloys.

Contents of the invention

The object of the present invention is to provide a new lead-free copper alloy material for welding and a preparation method thereof for the above-mentioned deficiencies in the prior art. The new lead-free copper alloy material can prevent zinc oxidation, and while greatly reducing the material cost, it also improves the stability of the welding carrier and prolongs the service life of the welding carrier.

In order to achieve the above object, the technical solutions adopted by the present invention are as follows.

A new lead-free copper alloy material for welding, the composition of mass percent is: 13-15% tin; 0.5-1.5% manganese; 16-18% zinc; the balance is copper.

Preferably, the new lead-free copper alloy material used for soldering provided by the present invention comprises the following mass percentage composition: 13% tin; 1.5% manganese; 16% zinc; and the balance is copper.

Preferably, the new lead-free copper alloy material for soldering provided by the present invention comprises the following mass percent composition: 15% tin; 0.5% manganese; 18% zinc; and the balance is copper.

Preferably, the new lead-free copper alloy material used for soldering provided by the present invention has a mass percentage composition of: 14% tin; 1% manganese; 17% zinc; and the balance is copper.

The present invention further provides a method for preparing new lead-free copper alloy materials for welding, comprising the following steps:

1) Put tin, zinc, manganese, and copper in a power frequency electric furnace according to the ratio, heat to 1150-1200 degrees, and keep warm to 1100 degrees after completely melting.

2) After stirring the completely melted graphite with a graphite rod, cover it with high-purity scaly graphite powder to prevent oxidation, with a thickness of 25-30cm.

3) After 40-45 minutes of heat preservation, use the German Spike direct-reading spectrometer to test the composition of the sample taken out of the power frequency electric furnace three times to confirm that the alloy composition is within the specified range.

4) After further holding the heat for 30-35 minutes, raise the temperature to 1350 degrees again, and turn on the vibration device of the power frequency electric furnace, the vibration frequency is 1 time/second; use the horizontal continuous casting method to cast a solid alloy with a diameter of 45mm and a length of 700mm bar.

5) The surface of the blank bar is processed by a light ingot machine, and processed into a bar with a smooth surface, a diameter of 40mm, and a length of 700mm; it is extruded by a 1200-ton single-action extrusion machine, and the heating temperature of the alloy ingot is 100-150 degrees. The extrusion temperature is 200 degrees, and the extrusion speed V=10mm/s; the diameter of the alloy rod after extrusion is 31mm, and the length is 1150mm, and then the alloy rod is peeled once to 21mm with a high-precision tungsten steel thin-skin die.

6) Use a head making machine to make one end of the alloy rod into a drawing section with a length of 100mm and a diameter of 25mm; use a finished mold to draw the alloy rod multiple times into a welding wire blank with a diameter of 7mm and a tolerance of +/-0.05mm Rods are then cut into lengths of 500mm and tolerances of +1/-0.5mm.

7) Pack and store.

The beneficial effects of the present invention are:

This invention replaces the lead element while ensuring the performance of the original traditional welding material, which meets the ROHS requirements. Adding manganese element to the new lead-free copper alloy material used for welding of the present invention can achieve the purpose of preventing zinc oxidation, while greatly reducing the cost of materials, it also improves the stability of the welding carrier and prolongs the service life of the welding carrier.

Description of drawings

Fig. 1 is the flow chart of the preparation method of the new lead-free copper alloy material for soldering of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

(1) Example 1

A new lead-free copper alloy material for soldering, the mass percentage composition is: 13% tin; 1.5% manganese; 16% zinc; the balance is copper.

The preparation method of the lead-free copper alloy new material that is used for welding of embodiment 1, as shown in Figure 1, comprises the steps:

1) Put tin, zinc, manganese, and copper in a power frequency electric furnace according to the ratio, heat to 1150-1200 degrees, and keep warm to 1100 degrees after completely melting.

2) After stirring the completely melted graphite with a graphite rod, cover it with high-purity flake graphite powder to prevent its oxidation, with a thickness of 25-30cm.

3) After 40-45 minutes of heat preservation, use the German Spike direct-reading spectrometer to test the composition of the sample taken out of the power frequency electric furnace three times to confirm that the alloy composition is within the specified range.

4) After further holding the heat for 30-35 minutes, raise the temperature to 1350 degrees again, and turn on the vibration device of the power frequency electric furnace, the vibration frequency is 1 time/second; use the horizontal continuous casting method to cast a solid alloy with a diameter of 45mm and a length of 700mm bar.

5) The surface of the blank bar is processed by a light ingot machine, and processed into a bar with a smooth surface, a diameter of 40mm, and a length of 700mm; it is extruded by a 1200-ton single-action extrusion machine, and the heating temperature of the alloy ingot is 100-150 degrees. The extrusion temperature is 200 degrees, and the extrusion speed V=10mm/s; the diameter of the alloy rod after extrusion is 31mm, and the length is 1150mm, and then the alloy rod is peeled once to 21mm with a high-precision tungsten steel thin-skin die.

6) Use a head making machine to make one end of the alloy rod into a drawing section with a length of 100mm and a diameter of 25mm; use a finished mold to draw the alloy rod multiple times into a welding wire blank with a diameter of 7mm and a tolerance of +/-0.05mm Rods are then cut into lengths of 500mm and tolerances of +1/-0.5mm.

7) Pack and store.

(2) Example 2

A new lead-free copper alloy material for welding, the mass percentage composition is: tin 15%; manganese 0.5%; zinc 18%; the balance is copper.

The new lead-free copper alloy material for soldering in Example 2 was obtained by the same method as in Example 1.

(3) Example 3

A new lead-free copper alloy material for welding, the composition of mass percent is: 14% tin; 1% manganese; 17% zinc; the balance is copper.

The new lead-free copper alloy material for soldering in Example 3 was obtained by the same method as in Example 1.

The properties of the new lead-free copper alloy material used for welding provided by the present invention and the traditional welding material are shown in Table 1.

Table 1 Performance comparison between new lead-free copper alloy materials for welding and traditional welding materials

The above description is only a preferred embodiment of the present invention, and is not intended to limit the implementation scope of the present invention; if it does not depart from the spirit and scope of the present invention, any modification or equivalent replacement of the present invention shall be covered by the claims of the present invention. within the scope of protection.

Claims (4)

1. the Novel lead-free copper alloy material for welding, is characterized in that, its mass percent consists of: tin 13%; Manganese 1.5%; Zinc 16%; Surplus is copper.

2. the Novel lead-free copper alloy material for welding, is characterized in that, its mass percent consists of: tin 15%; Manganese 0.5%; Zinc 18%; Surplus is copper.

3. the Novel lead-free copper alloy material for welding, is characterized in that, its mass percent consists of: tin 14%; Manganese 1%; Zinc 17%; Surplus is copper.

4. the preparation method of Novel lead-free copper alloy material for welding as described in any one in claim 1-3, comprises the following steps:

1) according to proportioning, Xi ﹑ Xin ﹑ Meng ﹑ copper is placed in main frequency furnace, is heated to 1150-1200 DEG C, be incubated to 1100 DEG C after fusing completely;

2), after fully being stirred by its fusing completely with graphite rod, cover high-purity flaky graphite powder and be oxidized to prevent it, thickness is 25-30cm;

3), after being incubated 40-45 minute, producing Spike direct-reading spectrometer with Germany and three composition inspections are carried out, to determine that its alloying component is within prescribed limit to the sample taken out in main frequency furnace;

4) insulation is after 30-35 minute further, and be again warming up to 1350 DEG C, and open the vibrating device of main frequency furnace, vibration frequency is 1 time/second, adopts horizontal continuous casting method to be cast as the solid alloy bar that diameter is 45mm, length is 700mm;

5) with light ingot machine, Surface Machining is carried out to blank rod, be processed as any surface finish, diameter is 40mm, length is the bar of 700mm, adopt 1200 tons of single action extruder extruding, alloy pig heating-up temperature is 100-150 DEG C, extrusion temperature is 200 DEG C, extrusion speed V=10mm/s, the diameter of the rear alloy bar of extruding is 31mm, length is 1150mm, then uses high accuracy wolfram steel thin skin mould by alloy bar peeling once to 21mm;

6) with head machine processed, the drawing section that length is 100mm, diameter is 25mm is made in one end of alloy bar, be diameter with finishing die by alloy bar multi-drawing be 7mm, tolerance is the welding wire base rod of +/-0.05mm, afterwards welding wire base rod is cut into that length is 500mm, tolerance is the specification of+1/-0.5mm;

7) pack and put in storage.