KR100644510B1 - High strength lead-frame material Cu-Ni-Mn-Si-Sn-Ms alloy with good hot-workability and good anti-softening and it's manufacturing method - Google Patents

Abstract

The present invention is a copper (Cu) -nickel (Ni) -manganese (Mn) -silicon (Si) -tin (Sn) -mesh metal (Ms) -based alloy for the high-strength lead frame material with improved hot workability and softness The purpose of the present invention is to reduce cost by reducing the expensive nickel content added in high strength leadframe materials, and to reduce the cost of alloys in copper-nickel-silicon-magnesium alloys, which are solid-solution and precipitation-reinforced leadframe alloys. To maintain the content of highly oxidative silicon during dissolution, strong deoxidation capacity is excluded, but oxidizing and igniting magnesium are excluded, and the safety and excellent inoculation effect for deoxidation and microstructure of cast structure are added to reduce cost, productivity, The present invention provides a new high strength lead frame material alloy with improved safety and durability of materials and a method of manufacturing the same. The composition of the present invention is a copper-nickel-manganese-silicon-tin-mishmetal-based alloy with 0.5-5.0 wt% nickel (Ni), 0.6-5.0 wt% manganese (Mn), 1.1-3.0 wt% silicon (Si) and An alloy composed of 0.05 to 3.0 wt% tin (Sn) and 0.001 to 1.0 wt% mismetal (Ms), the remainder of which is made of copper (Cu), and a method of manufacturing the same.

High-strength leadframe material, copper, nickel, manganese, silicon, tin, mesh metal, hot workability, softening temperature

Description

Copper (nick) -nickel (Ni) -manganese (Mn) -tin (Sn) -mesh metal (Ms) -based alloys for high-strength lead frame materials with improved hot workability and softening properties strength lead-frame material Cu-Ni-Mn-Si-Sn-Ms alloy with good hot-workability and good anti-softening and it's manufacturing method}

1 is a physical diagram of a high-temperature compression test showing the effect of the addition of the mesh metal on the hot workability,

2 is a characteristic diagram of a Cu-Ni-Mn-Si-Sn-Ms alloy on softening resistance,

3 to 5 are high-temperature compression when 0.15 wt%, 0.10 wt% and 0.05 wt% of the misch metal is added to the Cu-3.0 wt% Ni-0.5 wt% Mn-0.65 wt% Si-0.1 wt% Sn alloy system, respectively. Compressive stress and strain curves showing the real and tested process.

The present invention is a copper (Cu) -nickel (Ni) -manganese (Mn) -silicon (Si) -tin (Sn) -mesh metal (Ms) -based alloy for the high-strength lead frame material with improved hot workability and softness It is about a method.

Conventional high-strength lead frame material copper alloys include copper-nickel-silicon-magnesium alloys, but such alloys are difficult to hot work and have a low softening temperature, thereby showing dissatisfaction with their function as lead frames.

An example of this is hot rolling in a practical product produced by a conventional facility with an alloy containing 2.2-4.2 wt% of nickel, 0.25-1.20 wt% of silicon, and 0.05-0.30 wt% of magnesium. It is demanding, and the tensile strength at this time is about 575 MPa based on the softening temperature of 90 ° C.

In addition, the copper-nickel-silicon-magnesium alloy, which is a solid solution hardening and precipitation hardening alloy type, contains magnesium with high deoxidation ability to maintain the content of highly oxidizing silicon during alloy dissolution. There is a problem that requires careful attention in the alloy.

An object of the present invention for solving the above problems is to reduce the expensive nickel content added in a large amount in high-strength lead frame material to reduce the cost, and copper-nickel-silicon which is an alloy of solid solution strengthening and precipitation-enhanced lead frame material -Magnesium alloys have strong deoxidizing ability to maintain the content of highly oxidative silicon during alloy dissolution, but excludes oxidizing and flammable magnesium and adds safe and safe inoculation effect for deoxidizing and casting structure. It is to provide a new high strength lead frame material alloy with improved cost reduction, productivity, safety in manufacturing and durability of the material, and a method of manufacturing the same.

In addition, an object of the present invention is the main elements constituting the mesh metal, cerium and lanthanum are fine composite compounds synthesized with copper, nickel, manganese and silicon, Cu.Ni.Mn.Si.SnxCe and Cu.Ni.Mn. It is to provide a high-strength lead frame material and a method of manufacturing the same by forming a composite precipitated phase such as Si.SnyLa to improve the physical properties of the material.

In other words, 1) the effect of inoculation treatment with cerium and lanthanum, the main components of the mesh metal, was found to be finer in the columnar tissue and to remove the directionality of the coagulated tissue, 2) to prevent cracking of the ingot during plastic working and to increase the plastic working rate and total processing rate, 3) Improved strength of material by hardening work due to increase of total processing rate, 4) Improved strength and softenability by precipitation strengthening effect of fine composite compound or composite phase by addition of cerium and lanthanum, which are the major elements of misc metal It is to provide a high strength lead frame material and a method of manufacturing the same.

The alloy of the present invention, which achieves the object as described above and performs the task of eliminating the conventional drawbacks, in order to improve hot workability, reduces the hot working temperature instead of reducing the content of nickel, a solid solution element that increases the hot working temperature. Manganese, a solid solution element, was alloyed, and in order to enhance the reinforcement effect by softening temperature and processing heat treatment, which are related to durability, a small amount of the main component, which is able to exert an inoculation effect from the solidification stage after casting, in order to make the structure uniform and compact. In order to add lithium and lanthanum, an appropriate amount of their composite, mischmetal, was added.

The composition of the high-strength lead frame material alloy having improved hot workability and softness of the present invention as described above is 0.5 to 5.0 wt% nickel (Ni) and 0.6 to 5.0 wt% manganese (Mn) and 1.1 to 3.0 wt% silicon (Si). And 0.05 to 3.0 wt% tin (Sn), 0.001 to 1.0 wt% misc metal (Ms), and the remainder are made of copper (Cu).

In the above, the addition effect of nickel plays a role of maximizing the work hardening effect during cold rolling together with the strengthening of solid solution as a dedicated employment element for copper.

In the above, the effect of adding manganese is 1) it is cheaper than nickel and achieves a solid solution effect such as nickel, and 2) unlike nickel has the advantage of lowering the hot working temperature.

In the above, the effect of the addition of silicon is to obtain a precipitation strengthening effect, and the specific gravity is low, the overall weight ratio is low, the price is also an advantage, and deoxidation effect can also be expected.

In the above, the addition effect of tin has a critical strengthening effect in the copper alloy has the effect of improving the matrix strength after processing heat treatment, refine the structure and improve the plating property.

In the above, Mishmetal is a mixture of cerium and lanthanum, and its composition is composed of 60-65 wt% cerium and 35-40 wt% lanthanum. The additive effect is 1) to effectively add the main elements of cerium and lanthanum. 2) miniaturization of columnar tissue and direction of coagulation structure by inoculation treatment, 3) prevention of cracking of ingot during plastic working, increase of plastic working rate and total processing rate, and 4) total processing rate. 5) New high strength to improve the strength of the material by increasing the work hardening according to the increase, and to enhance the strength and softness by the precipitation strengthening effect of the fine composite compound or the composite phase by the addition of cerium and lanthanum, which are inoculation elements. It was added to develop a lead frame material. As a result, after proper annealing heat treatment and cold working, it has a fine matrix structure. It has a tensile strength of about 625 Mpa and an elongation of about 5-10 wt% at room temperature. Compared to about MPa, a high-strength lead frame material copper alloy having an improved softening property of about 600 MPa could be manufactured.

The reason for limiting each numerical value in the composition of the present invention was to derive the optimum alloy composition through the expected targets of the alloy composition envisioned with various intentions and the experimental results supplemented with the results, alloy refining, ingot manufacturing, hot rolling, annealing heat treatment And after the cold rolling to the final product, it was able to achieve the purpose of anticipating the physical properties with this.

The reason for limiting the nickel and manganese to 0.6 to 5.0 wt% (weight percent) in the composition of the present invention is that the hot and cold workability is not good over the limited composition range, and there is no improvement in strength or ductility of the material. This is because there are many problems in practicality.

The reason for limiting the silicon to 1.1 to 3.0 wt% in the composition of the present invention is that there is no aging strengthening effect at the lower limit or lower in the composition range, and if it is higher than the upper limit, the hot and cold workability is bad, and the elongation is extremely low, thus causing problems in practicality. It is becoming.

The reason for limiting tin to 0.05 to 3.0 wt% in the composition of the present invention is that there is no aging strengthening effect below the lower limit in the composition range, hot workability is poor at the upper limit or higher, and elongation is extremely low, which causes problems in practicality. .

The reason for limiting the misch metal to 0.001 to 1.0 wt% (weight percent) in the composition of the present invention is that there is no additive effect above the limited composition range, or rather the workability is difficult due to the poor flowability of the molten metal during dissolution refining, and after the ingot process In the process of, the cold workability is very bad and the ductility is very low, so that the cracking occurs during cold working, and the composition is less than the composition range. Numerical limitation was made in the composition range of the invention.

Copper (Cu) -nickel (Ni) -manganese (Mn) -silicon (Si) -tin (Sn) -mesh metal (Ms) system for high-strength lead frame materials having improved hot workability and softening property of the present invention having the above composition The manufacturing method of the alloy is as follows.

First, the compositional elements used in the alloy are 0.5 to 5.0 wt% nickel (Ni), 0.6 to 5.0 wt% manganese (Mn), 1.1 to 3.0 wt% silicon (Si), and 0.05 to 3.0 adding wt% tin (Sn) and 0.001-1.0 wt% mischmetal (Ms) to the basis weight of the remainder with copper (Cu);

After weighing, copper (Cu) and high melting point nickel (Ni) are first dissolved at the bottom of the furnace, and when both copper and nickel are dissolved, manganese and silicon are charged and dissolved, and slag generated in this process is removed. After charging and dissolving (Si), when the temperature of the molten metal is about 1,100 ° C, the heating is stopped or tin (Sn) is added to the extent that a very low heat source is supplied. Into the molten metal deep into the molten alloy,

When the alloying elements are sufficiently dissolved and the melt temperature is about 1200 ~ 1250 ℃, the flowability of the melt is improved and stabilized. Then, the ingot is produced by continuous casting.

The continuous cast ingot thus prepared is hot rolled in the range of 950 to 970 ° C. to form a plate-shaped coil in which the casting structure is completely removed, followed by annealing and solid solution treatment at a temperature of 700 to 800 ° C. for 2 to 5 hours. This is subjected to cold plastic working again through cold rolling, and subjected to age hardening at 500 to 600 ° C. for 2 to 5 hours, followed by cold rolling to impart final strength, thereby producing a high strength lead frame member coil.

The reason for the numerical limitation in each of the manufacturing steps is that if it is lower or higher than the numerical range of the limited section, the effect is not ideal or excessive.

In the process of performing the above processing and heat treatment, cerium and lanthanum are complexes of copper, nickel, manganese and silicon with Cu.Ni.Mn.Si.SnxCe and Cu.Ni.Mn.Si.SnyLa. In addition to forming a solid phase combined with the phase, it has the characteristics of high-strength material due to precipitation strengthening in addition to solid solution strengthening by nickel and manganese.

Hereinafter, the configuration and the operation of the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the effect of the addition of the mesh metal on the hot workability, Cu-3.0wt% Ni added 0.15wt% of magnesium (Mg) only to the base alloy Cu-3.0wt% Ni-0.65wt% Si alloy system Cu-3.0wt% Ni-0.65wt% Si-0.05wt% Mg-0.1wt% Ms alloy with -0.65wt% Si-0.15wt% Mg alloy and magnesium to 0.05wt% and 0.1wt% mischmetal As a result of performing a high temperature compression test at 925 ° C for a Cu-3.0wt% Ni-0.65wt% Si-0.1wt% Ms alloy containing 0.1 wt% of only Mishmetal (Ms) without adding magnesium, By replacing all of them with the misch metal, it is shown that the compression molding without the burst phenomenon occurs in the case of plastic processing such as compression at high temperature.

FIG. 2 shows the characteristics of the alloy of the present invention on softening resistance. As a result of tensile test of each alloy having a thickness of 0.4 mm after heat treatment at 600 ° C. for 5 minutes, Cu-3.0wt% Ni-0.5wt as specimen 12 In the case of% Mn-0.65wt% Si-0.1wt% Sn-0.05wt% Ms alloy, the tensile strength is 600Mpa in the 90 ° direction and the anisotropy shows good results similar to that of the tensile direction in the rolling direction is 625Mpa. Tensile strength in the 90-degree direction of Cu-3.0wt% Ni-0.65wt% Si-0.15wt% Mg alloy, which is a conventional alloy specimen 2, is higher than that of 575Mpa.

As a result, it has a composition of the alloy range of the present invention, and if subjected to a suitable heat treatment (Thermo-mechanical), hot rolling can be performed at 925 ℃ lower than the existing average of 970 ℃, tensile strength even after softening at 600 ℃ To provide a high-strength lead frame material having a hot workability and softening resistance to obtain a 600 ~ 625 Mpa and a manufacturing method thereof.

Table 1 is an example of the alloys presented in the present invention, and FIGS. 3, 4, and 5 show Cu-3.0wt% Ni-0.5wt% Mn-0.65wt% Si-0.1wt% Sn alloys. When 0.15wt%, 0.10wt% and 0.05wt% of Mish Metal were added, the lower the hot working temperature, the better the plastic working property. The compressive stress and deformation curve showing the real and test process of high temperature compression test were shown. It is showing good thing at 925 degreeC.

Table 1 Composition of Alloy

             Type of alloy   Cu   Ni   Mn   Si   Sn   Ms  Cu-2.2Ni-0.5Mn-0.25Si-0.05Sn-0.01Ms  Remainder   2.2   0.5  0.25  0.05  0.01  Cu-4.2Ni-0.5Mn-1.20Si-0.05Sn-0.01Ms  Remainder   4.2   0.5  1.20  0.05  0.01  Cu-3.0Ni-0.5Mn-0.65Si-0.05Sn-0.01Ms  Remainder   3.0   0.5  0.65  0.05  0.01  Cu-2.2Ni-0.5Mn-0.25Si-0.05Sn-0.05Ms  Remainder   2.2   0.5  0.25  0.05  0.05  Cu-2.2Ni-0.5Mn-1.20Si-0.05Sn-0.05Ms  Remainder   2.2   0.5  1.20  0.05  0.05  Cu-4.2Ni-0.5Mn-0.25Si-0.05Sn-0.05Ms  Remainder   4.2   0.5  0.25  0.05  0.05  Cu-4.2Ni-0.5Mn-1.20Si-0.05Sn-0.05Ms  Remainder   4.2   0.5  1.20  0.05  0.05  Cu-5.0Ni-5.0Mn-0.10Si-3.0Sn-0.001Ms  Remainder   5.0   5.0  0.10  3.0  0.001  Cu-5.0Ni-0.5Mn-3.0Si-0.05Sn-1.0Ms  Remainder   5.0   0.5  3.0  0.05  1.00  Cu-3.0Ni-0.5Mn-0.65Si-0.05Sn-0.05Ms  Remainder   3.0   0.5  0.65  0.05  0.05  Cu-3.0Ni-0.5Mn-0.65Si-0.05Sn-0.10Ms  Remainder   3.0   0.5  0.65  0.05  0.10  Cu-3.0Ni-0.5Mn-0.65Si-0.05Sn-0.15Ms  Remainder   3.0   0.5  0.65  0.05  0.15  Cu-0.5Ni-2.5Mn-0.65Si-0.05Sn-0.15Ms  Remainder   0.5   2.5  0.65  0.05  0.15  Cu-1.0Ni-2.0Mn-0.65Si-0.05Sn-0.15Ms  Remainder   1.0   2.0  0.65  0.05  0.15  Cu-1.5Ni-1.5Mn-0.65Si-0.05Sn-0.15Ms  Remainder   1.5   1.5  0.65  0.05  0.15  Cu-2.0Ni-1.0Mn-0.65Si-0.05Sn-0.15Ms  Remainder   2.0   1.0  0.65  0.05  0.15  Cu-2.5Ni-0.5Mn-0.65Si-0.05Sn-0.15Ms  Remainder   2.5   0.5  0.65  0.05  0.15  Cu-3.0Ni-0.5Mn-0.65Si-0.05Sn-0.05Ms  Remainder   3.0   0.5  0.65  0.05  0.05  Cu-3.0Ni-0.5Mn-0.65Si-0.10Sn-0.05Ms  Remainder   3.0   0.5  0.65  0.10  0.05  Cu-3.0Ni-0.5Mn-0.65Si-0.50Sn-0.05Ms  Remainder   3.0   0.5  0.65  0.50  0.05  Cu-3.0Ni-0.5Mn-0.65Si-1.50Sn-0.05Ms  Remainder   3.0   0.5  0.65  1.50  0.05

Hereinafter is a preferred embodiment of the present invention.

(Example 1)

Copper (Cu)-3 wt% Nickel (Ni)-0.5 wt% Manganese (Mn)-0.65 wt% Silicon (Si)-0.05 wt% Tin (Sn)-0.1 wt% Mish metal (Ms) -based alloys instead of magnesium As an example of the addition of the misch metal, 3 wt% nickel (Ni), 0.5 wt% manganese (Mn), 0.65 wt% silicon (Si), 0.05 wt% tin (Sn), Adding 0.1 wt% of mischmetal (Ms) and weighing the rest with copper (Cu),

 After weighing, copper (Cu) and high melting point nickel (Ni) are first dissolved at the bottom of the furnace, and when both copper and nickel are dissolved, manganese and silicon are charged and dissolved, and slag generated in this process is removed. After charging and dissolving Si), when the temperature of the melt reached about 1,100 ° C, the heating was stopped or tin (Sn) was added to the extent that a very low heat source was supplied, and then the fine metal (MS) was used with a plunger. Charged deep into the molten alloy,

When the alloying elements are sufficiently dissolved and the melt temperature is about 1200 ~ 1250 ℃, the flowability of the melt is improved and the ingot is produced immediately by continuous casting.

The 70 mm thick continuous cast ingot was hot rolled at 970 ° C. to 8.5 mm in thickness to form a plate-shaped coil completely removed from the cast structure, followed by annealing and solid solution treatment at a temperature of 930 ° C. for 1 hour. This was further cold-rolled to a thickness of 2.0 mm, and subjected to age hardening treatment at 525 ° C. for 5 hours, whereby a cold-rolled sheet coil for a lead frame material having a thickness of 1.8 mm was manufactured.

In this case, the maximum tensile strength is 520 MPa and the maximum hardness is Hv127.

The added misc metal is a mixture of cerium and lanthanum, and the mixing ratio is sufficient as long as it satisfies any numerical condition satisfying 60 to 65 wt% cerium and 35 to 40 wt% lanthanum.

(Example 2)

Copper (Cu)-3 wt% Nickel (Ni)-0.5 wt% Manganese (Mn)-0.65 wt% Silicon (Si)-0.1 wt% Tin (Sn)-0.05 wt% Mishmetal alloy, copper-nickel-silicon An example of the addition of tin and mismetal to enhance the workability and aging reinforcement of the base alloy system is 3 wt% nickel (Ni), 0.5 wt% manganese (Mn), and 0.65 wt% silicon ( Si), to which 0.1 wt% tin (Sn) and 0.05 wt% mischmetal (Ms) are added, the remainder being weighed with copper (Cu),

After weighing, copper (Cu) and high melting point nickel (Ni) are first dissolved at the bottom of the furnace, and when both copper and nickel are dissolved, manganese and silicon are charged and dissolved, and slag generated in this process is removed. After charging and dissolving Si), when the temperature of the molten metal became about 1,200 ° C, the heating was stopped or tin (Sn) was added to the extent that a very low heat source was supplied. Charged deep into the molten alloy,

When the alloying elements are sufficiently dissolved and the melt temperature is about 1200 ~ 1250 ℃, the flowability of the melt is improved and the ingot is produced immediately by continuous casting.

The 70 mm thick continuous cast ingot was hot rolled at 970 ° C. to 8.5 mm in thickness to form a plate-shaped coil completely removed from the cast structure, followed by annealing and solid solution treatment at a temperature of 930 ° C. for 1 hour. This was further cold-rolled to a thickness of 2.0 mm, and subjected to age hardening treatment at 525 ° C. for 5 hours, whereby a cold-rolled sheet coil for a lead frame material having a thickness of 1.8 mm was manufactured.

In this case, the maximum tensile strength is 630 MPa and the maximum hardness is Hv157.

The added misc metal is a mixture of cerium and lanthanum, and the mixing ratio is sufficient as long as it satisfies any numerical condition satisfying 60 to 65 wt% cerium and 35 to 40 wt% lanthanum.

The following is a comparative example compared with the embodiment of the present invention.

(Comparative Example 1)

Copper (Cu) -3 wt% nickel (Ni) -0.65 wt% silicon (Si) -0.15 wt% Magnesium (Mg) -based alloy manufacturing example, 3 wt% (weight percent) nickel (Ni) and 0.65 adding wt% silicon (Si) and 0.15 wt% magnesium (Mg) to the basis weight, the remainder being copper (Cu),

After weighing, copper (Cu) and high melting point nickel (Ni) are added to the bottom of the melting furnace, and when both copper and nickel are dissolved, silicon is charged and dissolved, and slag generated in this process is removed, and the temperature of the molten metal is removed. When the molten alloy is about 1,200 ° C, the molten alloy step of dissolving the magnesium into the molten metal using a plunger to dissolve the heating or supply a very low heat source,

When the alloying elements are sufficiently dissolved and the melt temperature is about 1200 ~ 1250 ℃, the flowability of the melt is improved and the ingot is produced immediately by continuous casting.

The 70 mm thick continuous cast ingot was hot rolled at 970 ° C. to 8.5 mm in thickness to form a plate-shaped coil completely removed from the cast structure, followed by annealing and solid solution treatment at a temperature of 930 ° C. for 1 hour. This was further cold-rolled to a thickness of 2.0 mm, and subjected to age hardening treatment at 525 ° C. for 5 hours, whereby a cold-rolled sheet coil for a lead frame material having a thickness of 1.8 mm was manufactured.

In this case, the maximum tensile strength is 560 MPa and the maximum hardness is Hv145.

(Comparative Example 2)

Copper (Cu)-3 wt% Nickel (Ni)-0.65 wt% Silicon (Si)-0.05 wt% Magnesium (Mg)-0.05 wt% Ms based alloy. 3 wt% (wt%) nickel (Ni), 0.65 wt% (wt%) silicon (Si), and 0.05 wt% magnesium (Mg) are added thereto, and 0.05 wt% Mishmetal (Ms) ) And weighing the rest with copper (Cu),

After weighing, copper (Cu) and high melting point nickel (Ni) are added to the bottom of the melting furnace, and when both copper and nickel are dissolved, silicon is charged and dissolved, and slag generated in this process is removed, and the temperature of the molten metal is removed. When the melting temperature is about 1,200 ° C., the melting alloy step of dissolving the magnesium and the fine metal into the molten metal by using a plunger to dissolve the heating or supplying a very low heat source,

When the alloying elements are sufficiently dissolved and the melt temperature is about 1200 ~ 1250 ℃, the flowability of the melt is improved and the ingot is produced immediately by continuous casting.

The 70 mm thick continuous cast ingot was hot rolled at 970 ° C. to 8.5 mm in thickness to form a plate-shaped coil completely removed from the cast structure, followed by annealing and solid solution treatment at a temperature of 930 ° C. for 1 hour. This was further cold-rolled to a thickness of 2.0 mm, and subjected to age hardening treatment at 525 ° C. for 5 hours, whereby a cold-rolled sheet coil for a lead frame material having a thickness of 1.8 mm was manufactured.

In this case, the maximum tensile strength is 590 MPa and the maximum hardness is Hv146.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

The present invention as described above, in order to improve the hot workability, instead of reducing the content of nickel, a solid solution element to increase the hot processing temperature, alloyed a manganese, a solid solution element to lower the hot processing temperature, the softening temperature and processing much related to durability In order to enhance the strengthening effect by heat treatment, by adding an appropriate amount of a composite of the composites of miscitanium to add a small amount of cerium and lanthanum, which are able to exert an inoculation effect from the solidification stage after casting, in order to make the structure uniform and compact. The advantages of improved processability related to the production process and improved flame resistance related to the performance of the product,

In addition, cerium and lanthanum, which are the main elements constituting the fine metal added to the present invention, are fine composite compounds synthesized with copper, nickel, manganese, and silicon, Cu.Ni.Mn.Si.SnxCe and Cu.Ni.Mn. The effect of inoculation treatment with the material properties of the material, that is, the main components of the cerium and lanthanum, such as Si and SnyLa, was found in Si.SnyLa and the like. Increasing the plastic working rate and the total working rate, increasing the hardening of the material by increasing the total working rate, and strengthening the precipitation of fine composite compounds or composite phases by adding cerium and lanthanum, the main elements of the mesh metal. It is a useful invention having the advantage of improving the strength and softness of the furnace, and the invention is expected to be greatly used in the related industry.

Claims (4)

delete In the copper alloy for high-strength lead frame material with improved hot workability and softness, 0.5 to 5.0 wt% Nickel (Ni), 0.6 to 5.0 wt% Manganese (Mn), 1.1 to 3.0 wt% Silicon (Si), 0.05 to 3.0 wt% Tin (Sn), and 0.001 to 1.0 wt% Mishmetal (Ms) And the remainder is made of copper (Cu), the fine metal (Ms) for high-strength lead frame material improved hot workability and softening, characterized in that the composition is composed of 60 ~ 65wt% cerium and 35 ~ 40wt% lanthanum Copper (Cu) -nickel (Ni) -manganese (Mn) -silicon (Si) -tin (Sn) -mesh metal (Ms) based alloy. delete In the manufacture of a high strength lead frame material copper alloy with improved hot workability and softness, Copper (Cu) -nickel (Ni) -manganese (Mn) -silicon (Si) -tin (Sn) -mesh metal (Ms) -based alloys are 0.5 to 5.0 wt% nickel (Ni) and 0.6 to 5.0 wt% manganese ( Mn) and 1.1 to 3.0 wt% silicon (Si) and 0.05 to 3.0 wt% tin (Sn) and 0.001 to 1.0 wt% Mishmetal (Ms), where Mishmetal is 60 to 65 wt% cerium and 35 to 40 wt% Basis weight of lanthanum), After weighing, copper (Cu) and high melting point nickel (Ni) are first dissolved at the bottom of the furnace, and when both copper and nickel are dissolved, manganese and silicon are charged and dissolved, and slag generated in this process is removed. When the molten metal was charged and melted, and the temperature of the molten metal became about 1,100 ° C, the heating was stopped or tin (Sn) was added to the extent of supplying a very low heat source, and then the misch metal (MS) was melted using a plunger. Charged deep into the molten alloy stage, When the alloying elements are sufficiently dissolved and the molten metal temperature is about 1200 to 1250 ° C., the flowability of the molten metal is improved and stabilized, thereby producing an ingot by continuous casting; After the continuous casting ingot is hot-rolled in the range of 950 ~ 970 ℃ to form a plate-shaped coil with the casting structure removed, and then maintained for 2 to 5 hours at a temperature of 700 ~ 800 ℃ to perform annealing and solid solution treatment, cold again The hot workability characterized by the method of manufacturing a high strength lead frame material coil by rolling and performing cold plastic working, performing age hardening at 500-600 degreeC for 2 to 5 hours, and then cold rolling to give final strength. A method for producing a copper (Cu) -nickel (Ni) -manganese (Mn) -silicon (Si) -tin (Sn) -mesh metal (Ms) -based alloy for high strength leadframe materials having improved softening properties.

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