KR960014952B1 - Making method of cu-cr-zr-ce-la-nd-pr alloy & heat-treatment - Google Patents

Abstract

This copper alloy is used for electrical contact materials or electrode materials for resistance welding and spot welding. This alloy comprises 0.20 to 1.45wt.% Cr, 0.02 to 2.00wt.% Zr, 0.02 to 0.50wt.% total sum of Ce, La, Nd, and Pr and the balance of Copper. This alloy is produced by the processes of (a) manufacturing a billet or slab by melting and casting the same composition as above as starting materials, (b) hot working the billet or slab by forging, rolling and extrusion in the reduction ratio of over 85% at 800 to 950deg.C for removing cast structure, (c) solution treating the hot worked material by quenching such as water cooling or oil cooling after holding for over 30min per the thickness of 1 inch at 800 to 1050deg.C, (d) cold working by rolling, forming, drawing in the reduction ratio of over 70% at the room temperature, and (e) aging hardening heat-treating by water cooling, oil cooling, air cooling after holding for over 1 hr at 350 to 550deg.C..

Description

Method for producing copper-chromium-zirconium-cerium-lanthanum-nidium-praseodymium alloys as electrical contact materials or electrode materials for welding

The present invention provides copper (Cu) -chromium (Cr) -zirconium (Zr) -cerium (Ce) -lanthanum (La) which can exhibit its characteristics as an electrode material for resistance welding and spot (spot) welding of electrical contact materials or steel sheets. ) -Nidium (Nd) -prasedium (Pr) alloys.

Conventional diesel is a copper (Cu) -chromium (Cr) in which a small amount of zirconium (Zr) is alloyed with a copper (Cu) -chromium (Cr) binary alloy containing 1% (weight percent) of chromium (Cr) before and after Zirconium (Zr) ternary alloy maintains electrical conductivity of about 80% of pure copper by proper processing and heat treatment, while improving its strength up to 2 ~ 3 times of pure copper. Resistance welding and ash welding electrode materials are used for ashes and steel sheets.

In the state of copper (Cu)-chromium (Cr)-zirconium (Zr) ternary alloy, chromium (Cr) is about 0.45% by weight in copper (Cu) when heated to around 1,000 ° C Is employed and about 0.1 weight percent of zirconium (Zr) is employed in copper (Cu). When the aging treatment is performed, fine chromium (Cr) and zirconium (Zr) particles are precipitated to strengthen the matrix. However, 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) -zirconium (Zr) ternary alloys are instantaneously high pressing force when used as electrodes for resistance welding and spot (spot) welding of steel sheets with electrical contacts. Under the condition that high resistance heat is generated through a large current, the consumption of the contact part is large, and a so-called sticking shape that sometimes sticks to the object to be adhered sometimes occurs. These problems hinder the life of the electrode and make the weld water unclean.

In order to improve the characteristics of the copper (Cu) -chromium (Cr) -zirconium (Zr) ternary alloy, elements such as Al, Si, Be, Co, etc. having high aging hardenability are added. The hardness can be improved to some extent with the increase in the type and the amount of addition, but the conductivity is generally poor, which is not suitable.

In addition, in Japanese Patent Application Laid-open No. Hei 5-277755 (October 26, 1993), an alloy for a spot welding electrode of an Al alloy plate and a method of manufacturing the same and a spot welding electrode using the same, chromium ( The content of Cr is set at 1.5 to 20 wt% and limited to the spot (spot) welding electrode material of the aluminum (Al) and aluminum (Al) alloy plates, but the aluminum (Al) and aluminum (Al) alloys have good conductivity. In spot welding, there is a problem that a current of 2 to 3 times larger than spot welding of a steel sheet is required.

The present invention is to improve the problems of the prior art as described above, can be employed in the existing copper (Cu)-chromium (Cr)-zirconium (Zr) ternary alloy, the main component copper (Cu) and compounds Ingots are prepared after dissolution by adding cerium (Ce), lanthanum (La), nidium (Nd), praseodymium (Pr), etc. Copper-chromium-zirconium-serium-lanthanum, which is an electrical contact material or welding electrode material, which can produce stable and stable cerium, lanthanum copper, niodimi-dong copper and praseodymium copper precipitates to improve the properties of materials It is an object to provide a method for producing a niobium-prasedium-alloy.

In order to achieve the above object, the present invention, in the production of copper alloy for resistance welding and spot welding electrode material of electrical contact material or steel plate, chromium (Cr) 0.20 to 1.45% (weight percentage), zirconium (Zr) 0.02 to 2.00% (% By weight), and the total content of the four elements of cerium (Ce), lanthanum (La), nidium (Nd) and praseodymium (Pr) is 0.02 to 0.50% (weight percentage) Copper-chromium-zirconium-cerium-lanthanum-nidium-praseodymium alloy containing copper (Cu) as a remainder in the main manufacturing process, hot working process, solution treatment process, cold working process, aging Zirconium (Zr) 0.25-2.00% (weight percentage) is contained in 0.20-1.45% (weight percentage) of chromium (Cr), and it contains cerium (Ce), lanthanum (La), and niodi Copper-chromium-paper containing 0.02% (percent by weight) of the total content of the four elements of hate (Nd) and praseodymium (Pr), and the remainder of copper (Cu) Konium-cerium-lanthanum-nidiumdium-praseodymium alloys are subjected to ingot manufacturing process, hot working process, solution treatment process, age hardening heat treatment process, cold working process, or chromium (Cr) 0.20 ~ 1.45% A copper-chromium-zirconium-cerium-lanthanum-nidium-praseodymium alloy containing 0.25 to 2.00% (weight percentage) of zirconium (Zr) in (weight percentage) and remaining copper (Cu) To manufacture copper-chromium-zirconium-cerium-lanthanum-nidium-praseodymium alloys as electrical contact materials or welding electrode materials by performing ingot manufacturing process, hot working process, solution treatment process, and age hardening heat treatment process. It features.

In the present invention, as a method of improving the properties of the material even at high temperatures, the known hardness and conductivity are in the range of HRB (hardness) 60 to 90 and IACS (conductivity) 70 to 95%, respectively, even at aging of 500 ° C or higher. This can be explained in a sustainable way:

Copper (Cu) as a main component, the content of chromium (Cr) is added in the range of 0.20 to 1.45% (weight percentage) and zirconium (Zr) in the range of 0.25 to 2.00% (weight percentage) Here, it is a component that can generate precipitates such as cerium (Cu _X Ce), lanthanum copper (Cu _X La), nidium (Cu _X Nd) and praseodymium (Cu _X Pr) After dissolving the alloy by adding the total content of the four elements of cerium (Ce), lanthanum (La), nidium (Nd) and praseodymium (Pr) in the range of 0.02% to 0.50% (weight percentage). Prepare an ingot.

Ingots made of these components are prepared by the following three processing heat treatment processes to produce ash or electrodes, and thus, fine and stable precipitates (Cu _X Ce), lanthanum copper (Cu _X La), and nidium (Cu _X Nd) and prasedium (Cu _X Pr) are uniformly distributed in large quantities to improve the durability of the electrode for resistance welding and spot welding of the electrical contact material or steel sheet.

EXAMPLE

Hereinafter, an embodiment of the present invention will be described.

Example 1

Zirconium (Zr) 0.25 to 2.00% (weight percentage) in 0.20 to 1.45% (weight percentage) of chromium (Cr), which contains cerium (Ce), lanthanum (La), and nidium (Nd) Ingots are prepared after dissolving the copper (Cu) alloy containing 0.02 to 0.50% (by weight percent) of the total content of the four elements of praseodymium (Pr).

Hot working of annealing, rolling, extrusion, etc. is performed at 800-950 degreeC with the processing ratio of 7S (about 85%) or more which can remove the ingot structure of the ingot.

After maintaining the above at 30 to 1 minute in thickness at 800-1,050 degreeC, it quenchs by water cooling, oil cooling, etc., and performs solution solution.

The above is subjected to cold processing such as rolling, forging and drawing at a processing ratio of 70% or more at normal temperature.

After holding at 350-550 degreeC for 1 hour or more, an age hardening heat treatment is performed by water cooling, oil cooling, air cooling, etc.

The raw material which passed the above process is used as it is, or components, such as an electrode, are manufactured.

Example 2

Zirconium (Zr) 0.25 to 2.00% (weight percentage) in 0.20 to 1.45% (weight percentage) of chromium (Cr), which contains cerium (Ce), lanthanum (La), and nidium (Nd) Ingots are prepared after dissolving the copper (Cu) alloy containing 0.02 to 0.50% (weight percent) of the total content of the four elements of praseodymium (Pr).

Hot working of annealing, rolling, extrusion, etc. is performed at 800-950 degreeC with the processing ratio of 7S (about 85%) or more which can remove the ingot structure of the ingot.

After maintaining the above at 30 to 1 minute in thickness at 800-1,050 degreeC, it quenchs by water cooling, oil cooling, etc., and performs solution solution.

After holding at 350-550 degreeC for 1 hour or more, an age hardening heat treatment is performed by water cooling, oil cooling, air cooling, etc.

The above is subjected to cold processing such as rolling, forging and drawing at a processing ratio of 70% or more at normal temperature.

The raw material which passed the above process is used as it is, or components, such as an electrode, are manufactured.

Example 3

Zirconium (Zr) 0.25 to 2.00% (weight percentage) in 0.20 to 1.45% (weight percentage) of chromium (Cr), which contains cerium (Ce), lanthanum (La), and nidium (Nd) Ingots are prepared after dissolving the copper (Cu) alloy containing 0.02 to 0.50% (weight percent) of the total content of the four elements of praseodymium (Pr).

Hot working of annealing, rolling, extrusion, etc. is performed at 800-950 degreeC with the processing ratio of 7S (about 85%) or more which can remove the ingot structure of the ingot.

After maintaining the above at 30 to 1 minute in thickness at 800-1,050 degreeC, it quenchs by water cooling, oil cooling, etc., and performs solution solution.

After holding at 350-550 degreeC for 1 hour or more, an age hardening heat treatment is performed by water cooling, oil cooling, air cooling, etc.

The raw material which passed the above process is used as it is, or components, such as an electrode, are manufactured.

Referring to the example carried out according to the first embodiment of the present invention and the results are as follows.

The type and each component of the alloy in the Example is shown in Table 1, and was melt-cast into an 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 to 85 mm at room temperature to 1.5 mm in thickness, and then 450 After aging at 425 ° C., 425 ° C., 450 ° C., 475 ° C. and 500 ° C. for 3 hours, the solution was cooled by water and subjected to age hardening. The results are shown in Table 2 below, and Table 2 also shows the case of the conventional copper (Cu)-chromium (Cr)-zirconium (Zr) ternary alloy through the same process. Here, the alloy of the present invention has a hardness and conductivity higher than that of a conventional copper (Cu) -chromium (Cr) -zirconium (Zr) ternary alloy even after the aging treatment temperature is exposed to a temperature of 550 ° C. or higher, or 500 ° C. or higher. It was stable and maintained at a high level. On the other hand, the existing copper (Cu) -chromium (Cr) binary alloy at the aging temperature of 450 ℃ or more showed that the hardness decreases more rapidly when the content of chromium (Cr) exceeds 1.5wt%, but copper (Cu) The zirconium (Zr) binary alloy shows a stable state of hardness and conductivity even when the total amount of zirconium (Zr) is 2.0 wt%.

In the case of the spot welding electrode, the sticking effect of the welding object and the surrounding sticking was significantly improved. This is a fine and stable deposition door, which is uniformly distributed in the substrate, such as Cu _X Ce and Lanthanon. _X La), niodidium (Cu _X Nd) and praseodymium (Cu _X Pr).

As described above, the present invention can be employed in the existing copper (Cu) -chromium (Cr) -zirconium (Zr) ternary alloy stock, and cerium (Ce) is an element capable of forming a compound with copper as a main component. , Lanthanum (La), Nidium (Nd), Praseodymium (Pr), etc., to maintain stable hardness and conductivity even at high temperatures and improve durability as an electrode for resistance welding and spot welding of electrical contact materials and signs Of course, the sticking effect of the adherend is, of course, significantly improved, and there is an effect as a deoxidizer during alloy melting.

Claims (1)

In the production of copper alloys for resistance welding and spot welding electrode materials of electrical contact materials and steel sheets, zirconium (Zr) 0.02 to 2.00% (weight percentage) is contained in 0.20 to 1.45% (weight percentage) of chromium (Cr), Containing 0.02 to 0.50% (percent by weight) of the total content of the four elements: cerium (Ce), lanthanum (La), niodidium (Nd) and praseodymium (Pr), and copper (Cu) 7S which can remove the ingot fabrication of the ingot manufactured in the ingot manufacturing process, the ingot manufactured in the ingot manufacturing process of the remaining copper-chromium-zirconium-cerium-lanthanum-nidium-praseodymium alloy Forging, rolling, extrusion, etc., at 800 to 950 ° C with a steel ratio of more than about 85%), and maintaining the above at 30 minutes at 800 to 1,050 ° C for at least 30 minutes, followed by quenching with water or oil The solution treatment process for sieving, and the cold treatment such as rolling, forging, drawing, etc. at a processing rate of 70% or more at room temperature Copper-chromium, which is an electrical contact material or an electrode material for welding, comprising a cold working process and a heat treatment step of maintaining the above at 350 to 550 ° C. for at least 1 hour, and then performing age hardening heat treatment by water cooling, oil cooling, or air cooling. Process for producing zirconium-cerium-lanthanum-nidium-praseodymium alloys.