TWI569900B - Method of fabricating titanium-clad-copper electrode - Google Patents

Description

Method for manufacturing titanium-coated copper electrode

The present invention relates to a method of manufacturing an electrode, and more particularly to a method of manufacturing a titanium-coated copper electrode.

The titanium-coated copper electrode mainly has the advantages of high corrosion resistance of titanium and high conductivity of copper itself, so that the titanium-coated copper electrode can be used in a highly corrosive environment.

However, the conventional method for manufacturing a titanium-clad copper electrode is to cast a high-temperature copper melt soup in a titanium box, and to perform subsequent treatment after the copper melt soup is solidified. The method for manufacturing the titanium-clad copper electrode has two main disadvantages. The first disadvantage is that the copper melt cast in the titanium box of the thin plate is easily affected by the temperature gradient, resulting in the formation of a core crater at the center of the solidified copper. Defects, and copper near the shrinkage cavity, combine with high temperature to form copper oxide due to high temperatures. The second disadvantage is that the interface between titanium and copper is combined with copper to form a dilute region due to the molten state of the high temperature copper melt. In this dilute region, copper and titanium will mutually diffuse to form a hard and brittle intermetallic compound (Ti ₂ Cu), resulting in the formation of micro-cracks, which will increase the impedance of electron movement and the probability of arc generation. These two disadvantages will cause the prepared titanium-clad electrode to be easily etched from the position of micro-crack or core crater defects, thereby reducing the service life of the titanium-coated copper electrode and reducing the conductivity.

Therefore, it is necessary to provide a method for manufacturing a titanium-clad copper electrode to solve the problems of the conventional technology.

The main object of the present invention is to provide a method for manufacturing a titanium-clad copper electrode, which sequentially passes through the assembly, welding and rolling steps of a cold rolled titanium plate and a cold rolled copper plate. The titanium-clad copper electrode is obtained to avoid the occurrence of micro-cracks or core shrinkage defects.

In order to achieve the above object, the present invention provides a method for manufacturing a titanium-clad copper electrode, comprising the steps of: providing a cold-rolled copper plate; performing a coating step of coating the cold-rolled copper plate with at least two cold-rolled titanium shells to form a a first metal embryo, wherein the first metal embryo exposes a tip end of the cold-rolled copper plate; a welding step is performed on the first metal blank, and at least one seam of the cold-rolled titanium shell is welded to form a second a metal embryo; and a rolling step of the second metal blank to form the titanium-clad copper electrode, wherein the titanium-clad copper electrode has a total rolling ratio of greater than or equal to 85%.

In an embodiment of the invention, the number of the cold rolled titanium shells is two, and one of the cold rolled titanium shells has a U-shaped cross section, and the cold rolled titanium shells are another It has a cross section in the form of a flat plate.

In one embodiment of the present invention, the number of the cold rolled titanium shells is four, and two of the cold rolled titanium shells have a flat cross section, and the other of the cold rolled titanium shells The two have a circular arc profile.

In an embodiment of the invention, the soldering step is a laser soldering step having a laser power between 1500 watts and 2500 watts and a travel speed of between 1000 mm/min. Between 8000 mm / min.

In an embodiment of the invention, the laser welding step is performed under a shielding gas, wherein the shielding gas comprises an argon gas, and the gas flow rate of the shielding gas is between 20 liters/minute and 30 liters/ Between the points.

In an embodiment of the invention, the rolling step is a hot rolling step, wherein the hot rolling step has a hot rolling temperature between 500 ° C and 800 ° C, and 5 ° C in the hot rolling step. Cooling is performed at a cooling rate of from sec to 15 ° C / sec until reaching a temperature of one of 200 ° C to 300 ° C.

In an embodiment of the invention, after the hot rolling step, the method further comprises: performing a water cooling step on the titanium-clad electrode that reaches the cooling temperature.

In one embodiment of the invention, the cold rolled titanium shell has an average grain size between 20 microns and 40 microns.

In an embodiment of the invention, the average grain size of the cold rolled copper plate The inch system is between 10 microns and 50 microns.

In one embodiment of the invention, the cold rolled copper sheet is an oxygen free copper sheet having a purity of from 99.95% to 100%.

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Fig. 1 is a flow chart showing a method of manufacturing a titanium-coated copper electrode according to an embodiment of the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt; Furthermore, the directional terms mentioned in the present invention, such as upper, lower, top, bottom, front, rear, left, right, inner, outer, side, surrounding, central, horizontal, horizontal, vertical, longitudinal, axial, The radial, uppermost or lowermost layers, and the like, are merely illustrative and understanding of the invention and are not intended to limit the invention.

Referring to Fig. 1, Fig. 1 is a schematic flow chart showing a method 10 for manufacturing a titanium-coated copper electrode according to an embodiment of the present invention. The method for manufacturing a titanium-clad copper electrode according to the embodiment of the present invention mainly comprises the following steps 11 to 14: providing a cold-rolled copper plate (step 11); performing a coating step of coating the cold rolling by at least two cold-rolled titanium shells a copper plate to form a first metal embryo, wherein the first metal embryo exposes both ends of the cold-rolled copper plate (step 12); performing a welding step on the first metal blank to weld at least the cold-rolled titanium shell a seam to form a second metal blank (step 13); and a rolling step of the second metal blank to form the titanium-clad electrode, wherein the total copper rolling ratio of the titanium-clad electrode is greater than or equal to 85 % (step 14). The present invention will be described in detail below with reference to Fig. 1 for details of the implementation of the above steps of the embodiment and the principles thereof.

Referring to FIG. 1, a method 10 for manufacturing a titanium-clad copper electrode according to an embodiment of the present invention is first performed in a step 11 of providing a cold-rolled copper plate. In this step 11, the cold rolled copper plate has an average grain size of between 10 micrometers and 50 micrometers. In an exemplary embodiment, the cold rolled copper sheet may have an average grain size of substantially 30 microns. In another embodiment, the cold rolled copper sheet is an oxygen free copper sheet having a purity of from 99.95% to 100%. The purity referred to herein means that the composition of copper accounts for 99.95% to 100% by weight of the entire cold-rolled copper plate, and the insufficient component is composed of unavoidable impurities. It should be mentioned that the cold-rolled copper plate can be obtained by electrolysis, so that there is no core shrinkage defect at the center of the cold-rolled copper plate, so that the problems caused by the conventional casting technique can be avoided.

The method for manufacturing a titanium-coated copper electrode according to an embodiment of the present invention is followed by step 12: performing a coating step of coating the cold-rolled copper plate with at least two cold-rolled titanium shells to form a first metal embryo, wherein the first metal The embryo exposes the ends of the cold rolled copper plate. In this step 12, the average grain size of the cold rolled titanium shells may be between 20 microns and 40 microns. In an exemplary embodiment, the average grain size of the cold rolled titanium shells is substantially the same as the average grain size of the cold rolled copper sheets, for example, about 30 microns, which allows the cold rolled titanium shells to The cold-rolled copper plate has similar grain properties on the microstructure, which improves conductivity and corrosion resistance. In another embodiment, the cold rolled copper sheet is slightly flat and the number of the cold rolled titanium shells may be two or four. For example, when the number of the cold-rolled titanium shells is two, one of the cold-rolled titanium shells has a U-shaped cross section, and the other of the cold-rolled titanium shells has a flat shape. section. In other words, when the two cold rolled titanium shells coat the cold rolled copper sheet to form a first metal blank, the first metal blank can be exposed to the ends of the cold rolled copper sheet. For example, when the number of the cold-rolled titanium shells is four, two of the cold-rolled titanium shells have a flat cross section, and the other two of the cold-rolled titanium shells have an arc shape. Type profile. In other words, when the four cold-rolled titanium shells coat the cold-rolled copper sheet to form a first metal blank, the first metal blank can be exposed to the ends of the cold-rolled copper sheet. It is to be noted that the cold-rolled titanium shells are mainly used to coat the cold-rolled copper sheets and expose the ends of the cold-rolled copper sheets. Therefore, the dimensions of the cold-rolled titanium shells are preferably corresponding to cold rolling. The size of the copper plate.

The method 10 for manufacturing a titanium-clad copper electrode according to an embodiment of the present invention is followed by a step 13 of performing a soldering step on the first metal blank to weld at least one seam of the cold-rolled titanium shells to form a second metal blank. In this step 13, the soldering step may be a laser soldering step having a laser power of 1500 The tile is between 2500 watts and a moving speed is between 1000 mm/min and 8000 mm/min. In an exemplary embodiment, the laser welding step is performed under a shielding gas, wherein the shielding gas comprises an argon gas, and a gas flow rate of the shielding gas is between 20 liters/minute and 30 liters/minute. between. It should be mentioned that the laser welding step is mainly to weld the joints of the cold-rolled titanium shells (it is also possible to weld to the cold-rolled copper sheets located at the joints) to form the cold-rolled titanium shells. A casing covering the cold rolled copper plate.

Continuingly, for example, in the first embodiment of the laser welding step, the laser power is 2000 watts and the traveling speed is 6000 mm/min, and then the analysis of the polarization curve of the second metal embryo is performed. The pitting potential of 2.562 volts and the blunt voltage of 0.227 volts, wherein the pitting potential and the blunt voltage are transmitted through a commercially available potentiostat (Biologic VSP potentiostat) using 90 g/L of copper sulfate, 110 g. The second metal embryo was subjected to a polarization curve measurement at a temperature of 70 ° C and measured. Further, the experiment and analysis of the cold rolled titanium materials of the other examples 2-4 and the unprocessed ones are shown in Table 1 below. It can be seen from Table 1 that although the joints of the cold-rolled titanium shells are subjected to the above-described laser welding step, the overall degree of passivation does not affect the degree of passivation of the prepared titanium-coated copper electrodes, and even It is also possible to increase the pitting potential (compared to one of the unprocessed cold rolled titanium). Since the blunt voltage does not change significantly, it can be seen that the titanium-coated copper electrode obtained in the embodiment of the present invention is similar in degree of passivation to the unprocessed (non-laser-welded) cold-rolled titanium material, so the embodiment of the present invention The prepared titanium-coated copper electrode is not easily passivated. On the other hand, since the higher the pitting potential represents the better pitting resistance of the material, the titanium-coated copper electrode after the laser welding step can obtain more excellent pitting corrosion resistance.

Referring to FIG. 1 , a method for manufacturing a titanium-coated copper electrode according to an embodiment of the present invention is finally a step 14 : performing a rolling step on the second metal blank to form the titanium-coated copper electrode, wherein the titanium-coated copper The total rolling ratio of the electrodes is greater than or equal to 85%. In this step 14, the rolling step may be a hot rolling step, wherein the hot rolling step has a hot rolling temperature between 500 ° C and 800 ° C, and 5 ° C / sec in the hot rolling step. Cooling is carried out to a cooling rate of from 200 ° C to 300 ° C at a cooling rate of 15 ° C / sec. In an embodiment, when the hot rolling step is started, the second metal embryo may be heated in advance between 750 ° C and 900 ° C and held for 20 to 45 minutes to make the second metal embryo. Heat evenly. It is worth mentioning that the reason why the total rolling ratio of the titanium-coated copper electrode needs to be greater than or equal to 85% is that the interface between the cold-rolled titanium plate and the cold-rolled copper plate is joined by rolling, and Further avoid the generation of micro cracks. In addition, the total rolling ratio may be greater than 100%. For example, the length of the titanium-coated copper electrode is 10 mm (mm) before rolling, and 30 mm after rolling, and the total rolling ratio is 200%. In still another embodiment, after step 14 is performed, a titanium-clad electrode that reaches the cooling temperature may be subjected to a water cooling step to cool the titanium-coated copper electrode to room temperature.

In summary, the method for manufacturing a titanium-coated copper electrode according to the embodiment of the present invention sequentially obtains the titanium-coated copper electrode through the assembly, welding and rolling steps of the cold-rolled titanium plate and the cold-rolled copper plate, thereby avoiding micro-cracks. Or the generation of defects in the core.

The present invention has been disclosed in its preferred embodiments, and is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

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Claims (10)

A method for manufacturing a titanium-coated copper electrode, comprising the steps of: providing a cold-rolled copper plate; performing a coating step of coating the cold-rolled copper plate with at least two cold-rolled titanium shells to form a first metal blank, wherein the first a metal embryo exposing the ends of the cold-rolled copper sheet; performing a welding step on the first metal blank, welding at least one seam of the cold-rolled titanium shells to form a second metal blank; and forming the second metal The embryo is subjected to a rolling step to form the titanium-clad copper electrode, wherein the titanium-clad copper electrode has a total rolling ratio of greater than or equal to 85%. The method for manufacturing a titanium-coated copper electrode according to claim 1, wherein the number of the cold-rolled titanium shells is two, and one of the cold-rolled titanium shells has a U-shaped cross section. The other of the cold rolled titanium shells has a flat cross section. The method for manufacturing a titanium-coated copper electrode according to claim 1, wherein the number of the cold-rolled titanium shells is four, and two of the cold-rolled titanium shells have a flat cross section. The other two of the cold rolled titanium shells have a circular arc profile. The method for manufacturing a titanium-coated copper electrode according to claim 1, wherein the soldering step is a laser welding step having a laser power of between 1,500 watts and 2,500 watts, and A moving speed is between 1000 mm/min and 8000 mm/min. The method for manufacturing a titanium-coated copper electrode according to claim 4, wherein the laser welding step is performed under a shielding gas, wherein the shielding gas An argon gas is included, and one of the shielding gas gas flows between 20 liters/minute and 30 liters/minute. The method for producing a titanium-coated copper electrode according to claim 1, wherein the rolling step is a hot rolling step, wherein the hot rolling step has a hot rolling temperature between 500 ° C and 800 ° C, and In the hot rolling step, cooling is performed at a cooling rate of 5 ° C / sec to 15 ° C / sec until reaching a cooling temperature of 200 ° C to 300 ° C. The method for manufacturing a titanium-coated copper electrode according to claim 6, wherein after the hot rolling step, the method further comprises: performing a water cooling step on the titanium-clad electrode reaching the cold temperature. The method for producing a titanium-coated copper electrode according to claim 1, wherein the cold rolled titanium shell has an average grain size of between 20 μm and 40 μm. The method for producing a titanium-coated copper electrode according to claim 1, wherein the cold-rolled copper plate has an average grain size of between 10 μm and 50 μm. The method for producing a titanium-clad copper electrode according to claim 1, wherein the cold-rolled copper plate is an oxygen-free copper plate having a purity of 99.95% to 100%.