KR960014951B1 - Making method cu-cr-ce-la-nd-pr alloy and 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 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 of 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 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

Manufacturing method of copper-chromium-cerium-lanthanum-nidium-prasedium-dium alloy which is an electrode material for welding or welding

The present invention provides copper (Cu)-chromium (Cr)-cerium (Ce)-lanthanum (La)-nidium, which can exhibit its characteristics as an electrode material for resistance welding and spot (spot) welding of electrical contact materials or steel sheets. A method for producing a (Nd) -prasedium (Pr) alloy.

In the conventional case, a copper (Cu) -chromium (Cr) binary alloy containing 1% (wt%) of chromium (Cr) before and after the chromium (Cr) is appropriately processed and heat treated to maintain the electrical conductivity of about 80% of pure copper. It can improve up to 2 ~ 3 times of pure copper, and is industrially used as resistance welding and spot welding electrode material of contact material or steel plate in electric and electronic field.

According to the state diagram of the copper (Cu) -chromium (Cr) binary alloy, about 0.45% by weight of chromium (Cr) is employed in the copper (Cr) when heated to about 1,000 ° C, the temperature of 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 alloy is used for resistance welding and spot (spot) welding electrodes of electrical contacts or steel sheets, and has a high resistance through high current under instantaneous high pressing force. Since heat is generated, the contact part consumes a lot, and so-called sticking phenomenon that sometimes sticks to the object to be adhered sometimes occurs. These problems hinder the life of the electrode and keep the weld clean.

On the other hand, in order to improve the characteristics of the copper (Cu) -chromium (Cr) binary alloy, in the case of adding elements such as A1, Si, Be, Co, etc., which have high age hardenability, the kind and amount of the elements The hardness can be improved to some extent with the increase of, but the electrical conductivity is generally lowered, which is not suitable.

In addition, "the alloy for spot welding electrodes of A1 alloy plate, its manufacturing method, and the spot welding electrode using the same" of Japanese Patent Laid-Open No. 5-277755 (1993. 10. 26), which is known in the prior art, is described in claim 1 as 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 (A1) and aluminum (A1) alloy plates, but the aluminum (A1) and aluminum (A1) alloys are not conductive. Good spot welding is a problem that requires a current of 2-3 times larger than the spot welding of the steel sheet.

The present invention is to solve the problems of the prior art as described above, and can be dissolved in the existing copper (Cu) -chromium (Cr) binary alloy, and the element capable of forming a compound with the main component copper (Cu) After dissolving by adding phosphorus cerium (Ce), lanthanum (La), niodidium (Nd), praseodymium (Pr) and the like, ingot is produced and processed heat-processed to produce fine and stable cerium copper even at high temperature Copper-chromium-cerium-lanthanum-nidiumium-pra, an electrical contact material or welding electrode material, which can be formed throughout the base to improve the properties of the material by forming precipitates of lanthanum copper, niobium copper and praseodymium copper It is an object of the present invention to provide a method for producing a sediumdium alloy.

In order to achieve the above object, the present invention, in the manufacture of copper alloy for resistance welding and spot welding electrode material of electrical contact material or steel plate, chromium (Cr) 0.20 ~ 1.45% (weight percentage), cerium (Ce), lanthanum (La), Nidium (Nd), Praseodymium (Pr) containing 0.02 to 0.50% (by weight percentage) of the total content of the four elements, copper (Cu) as the remainder Cerium-lanthanum-nidiumdium-praseodymium alloys are subjected to ingot manufacturing process, hot working process, solution treatment process, cold working process, age hardening heat treatment process, or chromium (Cr) 0.20 ~ 1.45% ㅇ The percentage of the total content of the four elements of cerium (Ce), lanthanum (La), nidium (Nd) and praseodymium (Pr) is 0.02 ~ 0.50%) And copper-chromium-cerium-lanthanum-nidium-prasedium-dium alloys with the remainder of copper (Cu), ingot manufacturing process, hot working process, solution treatment process, age hardening heat treatment Cold and cold working processes or chromium (Cr) 0.20 to 1.45% (weight percentage) of cerium (Ce), lanthanum (La), nidium (Nd), and prasedium (Pr) Process for producing ingot of copper-chromium-cerium-lanthanum-nidium-praseodymium alloy containing 0.02 to 0.50% (percent by weight) of the total content of four elements, and remaining copper (Cu) It is characterized by producing a copper-chromium-cerium-lanthanum-nidium-praseodymium alloy which is an electrical contact material or an electrode material for welding by performing a hot working process, a solution treatment process, and an age hardening heat treatment process.

In the present invention, as a method of improving the properties of the material even at a high temperature, the known hardness and conductivity of the HRB (hardness) 60 ~ 90, IACS (conductivity) 70 ~ 95%, respectively, even in aging of 475 ℃ or more This can be explained in a sustainable way:

Copper (Cu) as the main component, the content of chromium (Cr) is added in the range of 0.20 ~ 1.45% (weight percentage), and during this process heat treatment cerium copper (Cu _x Ce), Lantang copper (Cu _x La ), Which can produce precipitates such as copper (Cu _x Nd) and praseodymium (Cu _x Pr), such as cerium (Ce), lanthanum (La), nidium (Nd), Ingot is prepared after melting the alloy by adding the total content of the four elements of praseodymium (Pr) in the range of 0.02% to 0.50 (percent by weight).

Ingots made of these components are prepared by the following three examples to prepare materials or electrodes, and thus, fine and stable precipitates of cerium copper (Cu _x , Ce), lantang copper (Cu _x La), Niobium copper (Cu _x Nd) and praseodymium copper (Cu _x Pr) are uniformly distributed in a large amount to improve the durability of resistance contact points and spot welding electrodes of electrical contact materials or steel sheets.

EXAMPLE

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

Example 1

The total content of the four elements of chromium (Cr) in 0.20 to 1.45% (percent by weight), cerium (Ce), lanthanum (Ls), nidium (Nd) and praseodymium (Pr) is 0.02 to An ingot is produced after dissolving a copper (Cu) alloy containing 0.50% (weight percentage) and using copper (Cu) as the remainder.

Hot working such as forging, rolling and extrusion is performed at 800 to 950 ° C. with a processing ratio of 7 S (about 85%) or more capable of removing 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 cold working of rolling, forging, drawing and the like is carried out at a normal processing temperature of 70% or more.

After the above 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.

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

Example 2

The total content of the four elements of cerium (Cr), lanthanum (La), niobium (Nd) and praseodymium (Pr) in the range of 0.20 to 1.45% by weight (Cr) is 0.02 to Ingot is prepared after dissolving a copper (Cu) alloy containing 0.50% (weight percentage) and using copper (Cu) as the remainder.

Hot working such as forging, rolling and extrusion is performed at 800 to 950 ° C. with a processing ratio of 7 S (about 85%) or more capable of removing the ingot structure of the ingot.

The solution 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, or the like to conduct a solution treatment.

After the above 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.

The cold working of rolling, forging, drawing and the like is carried out at a normal processing temperature of 70% or more.

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

Example 3

The total content of the four elements of cerium (Ce), lanthanum (La), niobium (Nd) and praseodymium (Pr) in the range of 0.20 to 1.45% by weight (Cr) is 0.02 to An ingot is produced after dissolving a copper (Cu) alloy containing 0.50% (weight percentage) and using copper (Cu) as the remainder.

Hot working such as forging, rolling and extrusion is performed at 800 to 950 ° C. with a processing ratio of 7 S (about 85%) or more capable of removing the ingot structure of the ingot.

The solution 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, or the like to conduct a solution treatment.

After the above 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.

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 examples are shown in Table 1, and melt cast to 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 400 After aging at 3 ° 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 in Table 2, hardness and cut rate were stable and maintained at a high level, compared to the conventional copper (Cu) -chromium (Cr) binary alloy. Meanwhile, the case of the existing copper (Cu) -chromium (Cr) binary alloys is also presented. In the present invention, the content of chromium (Cr) in the existing copper (Cu) -chromium (Cr) binary alloy exceeds 1.5wt% even after the aging treatment temperature is exposed at a temperature of 475 ° C or higher, that is, 475 ° C or higher. The hardness drops more rapidly at the aging temperature of 450 ° C. or higher. In the case of spot welding electrodes, the sticking effect of sticking with the welded object was remarkably improved in the welding operation. This is called Cu _x Ce, which is a fine and stable precipitate uniformly distributed in the matrix. Lanthanum copper (Cu _x La), nidiomium (Cu _x , Nd) and praseodymium copper (Cu _x Pr) is believed to be due to the presence.

The present invention as described above can be dissolved in the existing copper (Cu) -chromium (Cr) binary alloy, and the elements such as cerium (Ce), lanthanum (La), which can form a compound with copper as the main component By adding nidium (Nd) or praseodymium (Pr), it is possible to maintain stable hardness and conductivity even at high temperatures and to improve durability as an electrode for resistance welding and spot welding of electrical contact materials or steel sheets. This sticking sticking effect is remarkably improved and there is an effect as a deoxidizer at the time of alloy melting.

Claims (1)

In the production of copper alloy for resistance contact point and spot welding electrode material of electrical contact material or steel plate, chromium (Cr) 0.20 to 1.45% (weight percentage), cerium (Ce), lanthanum (La), nidium (Nd), Copper-chromium-cerium-lanthanum-nidium-prase containing 0.02 to 0.50% (by weight percentage) of the total content of the four elements of praseodymium (Pr) Forging, rolling, extruding, etc. at 800-950 ° C with a processing ratio of 7S (about 85%) that can remove the ingot structure of the ingot manufactured in the ingot manufacturing process after dissolving the Odium alloy. Hot working process to perform hot operation of the solution, the solution treatment process to maintain the above 30 minutes per 1 inch thickness at 800 ~ 1,050 ℃, and then quench the solution by quenching with water cooling, oil cooling, etc. Cold working process of cold working such as rolling, forging, drawing, etc., for 1 hour at 350 ~ 550 ℃ After the maintenance, the copper contact-chromium-cerium-lanthanum-nidium-praseodymium alloy, which is an electrical contact material or an electrode material for welding, which is made of a heat treatment step of aging hardening by water cooling, oil cooling, or air cooling. Manufacturing method.