KR0182225B1 - Cu-zr-mg-mischemetal alloy and the heat treatment thereof - Google Patents

Abstract

The present invention provides the production of copper (Cu) -zirconium (Zr) -magnesium (Mg) -mischmetal alloys for resistance welding and spot (spot) welding of electrical contact materials or steel sheets, and processing capable of exhibiting the characteristics thereof. Concerning the heat treatment, copper (Cu) as a main component, zirconium (Zr) contains 0.25 to 3.00% (weight percentage), and magnesium (Mg) 0.02 to 0.50% (weight percentage) In addition, the compound is a compound of a component capable of producing precipitates such as cerium copper Cu _X Ce, lanthanum copper Cu _X La, niodidium copper Cu _X Nd, and praseodymium copper Cu _X Pr during processing heat treatment. An alloy material characterized by adding a metal (mischmetal) in the range of 0.02 to 0.50% (weight percent), wherein the heat treatment to maintain the hardness and conductivity in the range of HRB 60 to 90 and IACS 70 to 95%, respectively It is about.

The material thus produced has excellent hardness and conductivity at high temperatures, and exhibits excellent performance when used as an electrode for resistance welding or spot welding of electrical contacts or steel sheets, and the production method is as follows.

That is, ingot is prepared after melting the copper (Cu) alloy, and the forging, rolling, extrusion, etc. at 800 ~ 950 ℃ at a processing ratio of 7S (about 85%) or more that can remove the cast structure. Is maintained at 800 to 1,050 ° C for at least 30 minutes per inch of thickness, followed by quenching with water-cooling and oil-cooled copper to perform solution treatment, and cold processing such as rolling, forging, drawing, etc. at a processing rate of 70% or more at room temperature. After the above step is maintained at 350 to 550 ° C. for at least 1 hour, the age-hardening heat treatment is performed by water cooling, oil cooling, or air cooling, and the above-described materials are used as they are or by manufacturing a part such as an electrode. According to the target properties of the material or product, the process order of cold working and age hardening heat treatment may be changed, and in some cases, the cold working process may be omitted.

Description

Copper (zir) -zirconium (Zr) -magnesium (Mg) -mischmetal alloys and processing heat treatment method of the alloys

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copper-zirconium (Zr) -magnesium (Mg) -mischmetal alloy and a process heat treatment method of the alloy, particularly for resistance welding and spot (spot) welding of electrical contact materials or steel sheets. Preparation of copper (zir) -zirconium (zr) -magnesium (mg) -mischmetal alloy as electrode material and physical properties of this alloy: 75-85% conductivity of pure copper, HRB 75- of hardness Brinnel B scale The present invention relates to a heat treatment method for processing in the 85th range.

Copper (Cu) -chromium (Cr) binary alloy containing about 1% (by weight percent) of conventional chromium (Cr) is maintained at about 80% of pure copper by proper processing and heat treatment. It is possible to improve it by about 3 times, and industrially, it is used as resistance welding and spot welding electrode material of a contact material or a steel plate in the field of electrical and electronics.

According to the state diagram of the copper (Cu) -chromium (Cr) binary alloy, about 0.45 weight percent of copper (Cr) is dissolved in copper (Cr) when heated to about 1,000 ° C, which is the temperature near the solution treatment. In the aging treatment, fine chromium (Cr) particles are precipitated to strengthen the matrix, but when the aging temperature is higher than 450 ° C., the hardness decreases rapidly.

This phenomenon means that the material deteriorates rapidly when the material is subjected to thermal effects of 450 ° C. or higher during use.

In view of this, conventional copper (Cu) -chromium (Cr) binary alloys, when used as electrodes for resistance welding and spot (spot) welding of electrical contacts or steel sheets, have high current through high current under instantaneous high pressing force. Since the heat of resistance is generated, the contact part consumes a lot, and sticking phenomenon that sometimes sticks to the object to be adhered sometimes occurs.

These problems impair the life of the electrode and have the disadvantage of making the weld unclean.

On the other hand, in order to improve the characteristics of the copper (Cu) -chromium (Cr) binary alloy, when elements such as Al, Si, Be, Co, etc., which have high age hardenability, are added, the kind and amount of the elements The hardness can be improved to some extent with the increase of, but the conductivity is largely impaired.

An object of the present invention for solving the above problems is to alloy zirconium (Zr), an element that can be dissolved and precipitated in copper (Cu) as the main component instead of chromium (Cr), and copper (Cu) as the main component Alloying magnesium (Mg), an element capable of forming a compound, and copper (Cu), which is a main component, and cerium (Ce), lanthanum (La), and nidium (Nd), an element capable of forming a compound. ) And ingots are prepared by dissolving a compound such as Praseodymium (Pr) and the like, and depositing fine zirconium (Zr) particles during processing heat treatment, It is to provide an alloy and a method for heat-treating the alloy, which allows stable copper magnesium, cerium copper, lanthanum copper, niobium copper and praseodymium copper precipitates to be produced throughout the base to improve the properties of the material.

The object of the present invention as described above is 0.25 to 3.00% (weight percent) zirconium (Zr) and 0.02% to 0.50% (weight percent) in the electrode material for resistance welding and spot (spot) welding of the electrical contact member or steel sheet Rate) Magnesium (Mg), 0.02% to 0.50% (weight percentage) of mischmetal (mischmetal), and the remainder is made of copper (Cu), the 0.02% to 0.50 (weight percentage) of mischmetal (mischmetal) Silver 50% (weight percentage) cerium (Ce), 25% (weight percentage) lanthanum (La), 15% (weight percentage) nidium (Nd), 5% (weight percentage) It is achieved by providing a copper (Cu) -zirconium (Zr) -magnesium (Mg) -mischmetal alloy characterized in that it is mixed with praseodymium (Pr).

The object of the present invention as described above is 0.25 to 3.00% (weight percentage) zirconium (Zr) and 0.02% to 0.50% (in the heat treatment method for the resistance welding and spot (spot) welding electrode material of the electrical contact member or steel sheet) Weight percentage) Magnesium (Mg), 0.02% to 0.50% (weight percentage) Mischmetal (mischmetal), and the remainder of the copper (Cu) alloy composed of copper (Cu) after melting the ingot is prepared, the Forging, rolling, extrusion, etc. are carried out at 800 to 950 ° C at a processing cost of 7S (about 85%) or more to remove the cast structure of the ingot, which is maintained at 800 to 1,050 ° C for at least 30 minutes per inch of thickness, followed by water cooling, The solution is quenched by quenching with oil, etc., and 70% at room temperature in order to prepare a large number of potential crossovers or dense portions, which are nucleation sites of precipitates, to uniformly deposit a large amount of fine precipitates during aging treatment after solution treatment. Cold processing such as rolling, forging, drawing, etc. Copper-zirconium (Zr) -magnesium (Mg) -mischmetal, which is subjected to aging hardening by water cooling, oil cooling, or air cooling after holding at 350 to 550 ° C. for at least 1 hour after cold working. By providing a process heat treatment method of the alloy.

When explaining the configuration and the operation of the embodiment of the present invention to achieve the object as described above and to perform the problem for removing the conventional defects in detail.

In the present invention, zirconium (Zr), which is an element that can be dissolved and precipitated in copper (Cu) as the main component, is alloyed instead of chromium (Cr), and is an element capable of forming a compound with copper (Cu) as the main component. Alloying magnesium (Mg) and forming a compound with copper (Cu) as a main component, cerium (Ce), lanthanum (La), nidium (Nd), and prasedium (Pr) Ingots were prepared after dissolution by addition of a compound such as mischmetal.

It not only precipitates fine zirconium (Zr) particles during processing heat treatment, but also produces fine and stable copper magnesium, cerium copper, lanthanum copper, niobium copper and praseodymium copper precipitates at high temperatures. It was possible to improve the characteristics of the.

The addition of magnesium (Mg) also has the effect as a deoxidizer in the alloy melting process.

Mischmetal is composed of 50% by weight (ce) and 25% by weight of lanthanum (La), and 15% by weight of nidium (Nd). ) And a compound containing about 5% (percent by weight) of praseodymium (Pr).

In other words, the present invention is a method that can improve the properties of the material even at high temperatures, the results of the examples show that the known hardness and conductivity is in the range of HRB 60 ~ 90, IACS 70 ~ 95%, even at aging 525 ℃ or more As a way to maintain, this is described as follows.

Copper (Cu) as the main component, zirconium (Zr) contained in the range of 0.25 to 3.00% (weight percentage), and magnesium (Mg) capable of producing copper magnesium Mg _X Cu during processing heat treatment In the range of 0.02 to 0.50% (weight percentage).

Here, the content range of zirconium (Zr) is to enhance the dispersion strengthening effect of zirconium (Zr) particles in the case of solid solution strengthening, precipitation strengthening and supersaturation, zirconium (Zr) is the solid solution limit for the base copper (Cu) Is 0.15%. In addition, it generates fine precipitates such as cerium copper Cu _X Ce, lanthanum copper Cu _X La, niobium copper Cu _X Nd, and prassadium copper Cu _X Pr, maximizing precipitation strengthening effect and solution solution. These are compounds of elements that inhibit the growth of grains during processing, such as Cu _X Ce, Lanthanum Copper Cu _X La, Niobium Copper Cu _X Nd, and Prasadiodymium Cu _X Pr. Ingot is prepared by dissolving an alloy by adding a misschmetal (mischmetal), which is a compound capable of producing a precipitate, in a range of 0.02% to 0.50% (weight percentage).

Ingots made of these components are then subjected to the following three processing heat treatment processes to produce materials or electrodes, thereby providing fine and stable precipitates of Mg _X Cu, Cu _X Ce, Cu _X La, Cu _X Nd, and Cu _X. Pr and the like were uniformly distributed in a large amount to improve the durability of the electrode for resistance welding and spot welding of the electrical contact material or steel sheet.

end. First process plan

Zirconium (Zr) is contained 0.25 to 3.00% (weight percentage), magnesium (Mg) is contained 0.02% to 0.50% (weight percentage), and there is 0.02% to 0.50% mischmetal (Percent by weight) added, dissolved copper (Cu) alloy with the remainder of copper, and then produced an ingot, which is 800-950 as a processing cost of 7S (about 85%) or more to remove the cast structure. Forging, rolling, extrusion, etc. are carried out at ℃ ℃, it is maintained at 800 ~ 1,050 ℃ at least 30 minutes per inch of thickness, then quenched by water cooling, oil cooling, etc., solution treatment, a large amount of fine during the aging treatment after solution treatment In order to prepare a large number of crossovers or dense parts of dislocations, which are nucleation sites of precipitates, to precipitate precipitates uniformly, cold processing such as rolling, forging, drawing, etc. is first performed at room temperature with a processing ratio of 70% or more, and then cold processed to 350 to 550. After holding for 1 hour at ℃, water cooling, oil cooling, air cooling, etc. To perform the age hardening heat treatment, a method of using, as the material finish the above process is that the state or manufacturing parts such as electrodes.

I. Second Process Plan

Zirconium (Zr) is contained 0.25 to 3.00% (weight percentage), magnesium (Mg) is contained 0.02% to 0.50% (weight percentage), and there is 0.02% to 0.50% mischmetal (Percent by weight) is added, the copper alloy containing copper (Cu) is dissolved, and then the ingot is prepared, and the processing ratio of 7S (about 85%) or more can remove the cast structure of the ingot from 800 to 800. Forging, rolling, extrusion, etc. are carried out at 950 ° C., which is maintained at 800 to 1,050 ° C. for at least 30 minutes per inch of thickness, followed by quenching with water cooling, oil cooling, etc. After holding for at least 1 hour, aging hardening heat treatment is performed by water cooling, oil cooling, air cooling, etc., and uniformly dispersing relatively coarse or partially developed precipitates precipitated in the above process, and processing cost of less than 70% at room temperature to obtain work hardening effect. For cold work such as rolling, forging, drawing And, a method of using, as the material is completing the process of its manufacturing conditions, or the components such as electrodes.

All. Third process plan

Zirconium (Zr) is contained 0.25 to 3.00% (weight percentage), magnesium (Mg) is contained 0.02% to 0.50% (weight percentage), and there is 0.02% to 0.50% mischmetal (Percent by weight) is added, the copper alloy containing copper (Cu) is dissolved, and then the ingot is prepared, and the processing ratio of 7S (about 85%) or more can remove the cast structure of the ingot from 800 to 800. Forging, rolling, extrusion, etc. are carried out at 950 ° C., which is maintained at 800 to 1,050 ° C. for at least 30 minutes per inch of thickness, followed by quenching with water cooling, oil cooling, etc. A method of producing a component such as an electrode or the like by using the material which has been subjected to the age hardening treatment by water cooling, oil cooling, air cooling, and the like after being maintained at ˜550 ° C. for at least 1 hour, and having finished the above process.

Hereinafter is an embodiment of the present invention.

EXAMPLE

Referring to the results of the example performed according to the first step above are as follows.

In Example, the type of alloy and each component are as shown in Table 1 below, and were cast by ingot with a thickness of 70mm.

After hot rolling at 880 ° C. with a workability of 7S (about 85%) to a thickness of 10 mm, and maintaining the solution at 960 ° C. for 1 hour, the solution solution was cold-rolled at room temperature to 1.5 mm in thickness by 85%, and then 400 After aging at 3O < 0 > C, 425 [deg.] C, 450 [deg.] C, 475 [deg.] C, 500 [deg.] C, 525 [deg.] C and 550 [deg.] C, respectively, the solution was cooled by water and subjected to age hardening heat treatment.

The results are shown in Table 2 below. Table 2 also shows the case of the conventional copper (Cu) -chromium (Cr) and copper (Cu) -zirconium (Zr) binary alloys.

The copper (Cu) -zirconium (Zr) binary alloy shows a stable hardness and conductivity even when the content of zirconium (Zr) is 2.0 wt%.

In the present invention, the hardness and conductivity of the present invention is stable and high compared with the conventional copper (Cu) -chromium (Cr) binary alloy even after exposure to an aging temperature of 525 ° C or higher, that is, 525 ° C or higher. Maintained.

In the case of spot welding electrode, the sticking effect of sticking with the welded object was remarkably improved during welding operation. This is a fine and stable precipitate, which is uniformly distributed in the base, such as cerium copper Cu _X Ce and lanthanum copper. It is considered that it is attributable to the presence of Cu _X La, niobium copper Cu _X Nd, and prassadiodium copper Cu _X Pr.

The present invention as described above is stable and high in hardness and conductivity, compared to the conventional copper (Cu) -chromium (Cr) binary alloy even after exposure to aging temperature of 525 ℃ or more, that is, 525 ℃ or more. In the case of spot welding electrodes, the sticking effect of sticking with the welded object was remarkably improved in the welding operation, and the cerium copper Cu _X Ce and lanthanum, which are fine and stable precipitates uniformly distributed in the matrix, were maintained. copper Cu _X La, you audio hatred copper such as Cu _X Nd, and plastic new audio hatred copper Cu _X Pr uniformly large amount distribution, such as to improve the resistance welding and that the durability as a contact welding electrodes of the electrical contact material and the steel sheet It works.

Claims (2)

In the electrode material for resistance welding and spot (spot) welding of an electrical contact material or a steel plate, 0.25-3.00% (weight percentage) zirconium (Zr), 0.02%-0.50% (weight percentage) magnesium (Mg), 0.02% to 0.50% (weight percentage) of mischmetal (mischmetal), and the remainder is made of copper (Cu), the 0.02% to 0.50% (weight percentage) of the mischmetal (50%) Cerium (Ce), 25% (weight percentage) Lanthanum (La), 15% (weight percentage) Nidium (Nd), 5% (weight percentage) Prasedium (Pr) Copper (Cu)-zirconium (Zr)-Magnesium (Mg)-Mischmetal (mischmetal) alloy, characterized in that the mixed composition. In the heat treatment method for the resistance welding of the electrical contact member or the steel sheet and the electrode material for spot (spot) welding, 0.25 to 3.00% (weight percent) zirconium (Zr) and 0.02% to 0.50% (weight percent) magnesium (Mg) And 0.02% to 0.50% (weight percentage) of mischmetal, and the remainder of copper (Cu) alloy made of copper (Cu) to dissolve the ingot to produce the ingot, the cast structure of the ingot can be removed Forging, rolling, extrusion, etc. are carried out at 800 to 950 ° C with a processing ratio of 7S (approximately 85%) or more, which is maintained at 800 to 1,050 ° C for at least 30 minutes per inch, followed by quenching with water cooling, oil cooling, etc. In order to provide a large number of crossovers or densities of dislocations, which are nucleation sites of precipitates, to uniformly deposit a large amount of fine precipitates during aging treatment after solution treatment, firstly, rolling, forging and drawing at a processing rate of 70% or more at room temperature Cold working, etc., and after cold working 350-550 degreeC Process heat treatment method of copper (Cu)-zirconium (Zr)-magnesium (Mg)-mischmetal (mischmetal) alloy, characterized in that aging hardening by water cooling, oil cooling, air cooling, etc. after maintaining for at least 1 hour.