Preparation method for improving structure and performance of horizontal continuous casting oxygen-free copper pipe casting blank

Abstract

The invention relates to the technical field of metal material preparation, in particular to a preparation method for improving the structure and performance of a horizontal continuous casting oxygen-free copper pipe casting blank, which comprises the following steps: S1, raw material preparation: preparing cathode copper and rare earth metal; the method comprises the following steps: S1, preparing raw materials, preparing rare earth metal according to 0.01%-0.10% of the total mass of the raw materials, adding the rare earth metal in the form of copper-rare earth intermediate alloy, and removing oxide skin before adding, S2, smelting: adding cathode copper into a smelting furnace in batches for smelting, covering with charcoal in the smelting process, keeping the thickness of a charcoal layer at 20cm-30cm, controlling the temperature of the smelting furnace at 1185-1200 DEG C, and keeping the temperature of the smelting furnace at 185-1200 DEG C; and after the cathode copper is completely molten, waiting for 10-20 minutes, and then properly fishing out slag. By means of charcoal deoxidization, rare earth refining modification and the like, the impurity element content of the oxygen-free copper pipe cast ingot is further reduced, the structure is improved, and the comprehensive performance is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal material preparation, and more specifically to a preparation method for improving the structure and performance of horizontal continuous casting oxygen-free copper tube ingots. Background Art

[0002] Oxygen-free copper is a special type of pure copper with high purity. It has good processing performance, electrical and thermal conductivity, and is widely used in thermal and electrical conductivity. Oxygen-free copper heat pipes are a highly efficient heat transfer element and are currently widely used in cooling and heat dissipation of electronic and electrical products.

[0003] As components that require heat dissipation develop towards high power, compactness and high heat flux density, the heat pipe shell is required to be smaller in size, have stronger processing deformation ability, higher thermal conductivity and heat dissipation efficiency, and better resistance to high temperature softening and corrosion. This requires the existing oxygen-free copper tube ingot to have a more uniform structure and better overall performance.

[0004] Therefore, the present invention proposes a preparation method for improving the structure and performance of horizontal continuous casting oxygen-free copper tube ingot to solve the above problems. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a preparation method for improving the structure and performance of horizontal continuous casting oxygen-free copper tube ingots, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a preparation method for improving the structure and performance of horizontal continuous casting oxygen-free copper tube ingot, comprising the following steps: Step S1, raw material preparation: preparing cathode copper and rare earth metal; The rare earth metal is added in the form of copper-rare earth master alloy at 0.01%-0.10% of the total mass of the raw materials, and the oxide scale is removed before adding; Step S2, smelting: adding cathode copper into a smelting furnace in batches for melting, covering with charcoal during the melting process, the thickness of the charcoal layer is maintained at 20 cm-30 cm, and the temperature of the smelting furnace is controlled at 1185° C.-1200° C.; After the cathode copper is completely melted, wait for 10-20 minutes before properly removing the slag; Step S3, refining and modification: after the contents of oxygen, phosphorus, sulfur and iron impurity elements in the melt are qualified, the prepared copper-rare earth master alloy block is uniformly and dispersedly added into the melt, and slag is properly removed after waiting for 10-15 minutes, and then the melt temperature is increased by about 10°C and then transferred into the casting furnace; Step S4, horizontal casting: the melt surface of the fore chamber and the hind chamber of the casting furnace is covered with flake graphite, and the thickness of the covering layer is 20cm-30cm; The surface of the melt in the middle chamber is covered with charcoal, and the thickness of the covering layer is 20cm-30cm; Remove the charcoal from the middle chamber every once in a while and cover it with new charcoal. The melt temperature in the casting furnace is controlled at 1155°C-1165°C for horizontal drawing, and the drawn ingot is sawn to a fixed size to obtain an oxygen-free copper tube ingot with uniform structure and excellent performance.

[0007] In a preferred embodiment, in step S1, the cathode copper needs to be degreased and oxidized spots removed to ensure that the cathode copper is clean and free of oxidation.

[0008] In a preferred embodiment, in step S1, the rare earth metal is one of yttrium and lanthanum, and the rare earth content in the copper-rare earth master alloy is 10%-20%.

[0009] In a preferred embodiment, in step S2, after the cathode copper is completely melted, samples are then taken to detect whether the contents of impurity elements such as oxygen, phosphorus, sulfur, and iron in the melt are below a specified value; If it is too high, replace the covering charcoal in time and extend the waiting time after melting.

[0010] In a preferred embodiment, in step S2, the specified value of the impurity element content is 5ppm-15ppm.

[0011] In a preferred embodiment, in step S3, the size of the rare earth master alloy block is 15 mm-35 mm.

[0012] In a preferred embodiment, in step S4, the charcoal in the middle of the chamber is removed at regular intervals, more specifically, 2 cm to 3 cm of charcoal is left and then covered with new charcoal.

[0013] In a preferred embodiment, in step S4, the charcoal is white charcoal with a particle size of 20 mm-40 mm.

[0014] In a preferred embodiment, in step S4, the interval is every 60 minutes to 90 minutes.

[0015] Technical effects and advantages of the present invention: The present invention adopts charcoal deoxidation, rare earth refining and modification and other means to further reduce the content of impurity elements, improve the structure and enhance the comprehensive performance of the oxygen-free copper tube ingot. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the preparation process in the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Embodiment 1: Reference Figure 1 A preparation method for improving the structure and performance of horizontal continuous casting oxygen-free copper tube ingots comprises the following steps: Step S1, raw material preparation: prepare cathode copper and rare earth metal according to the setting, remove oil and oxidation spots from the cathode copper, and ensure that the cathode copper is clean and has no surface oxidation. Rare earth yttrium is added in the form of copper-yttrium master alloy at 0.06% of the total mass of the raw materials, and the oxide scale is removed before adding.

[0019] Step S2, smelting: adding cathode copper into the smelting furnace in batches for melting, covering with charcoal during the melting process, the thickness of the charcoal layer is maintained at 25 cm, and the temperature of the smelting furnace is 1190°C; after the cathode copper is completely melted, wait for 15 minutes before properly slagging, so that the content of impurity elements such as oxygen, phosphorus, sulfur, and iron in the melt is below 10ppm.

[0020] Step S3, refining and modification: after the contents of impurity elements such as oxygen, phosphorus, sulfur, and iron in the melt are qualified, the prepared copper-yttrium master alloy blocks with a size of about 20 mm are evenly dispersed into the melt, and after waiting for 10 minutes, the slag is properly removed, and then the melt temperature is increased to 1200°C and then transferred to the casting furnace.

[0021] Step S4, horizontal casting: The melt surface of the front chamber and the rear chamber of the casting furnace is covered with flake graphite, and the thickness of the covering layer is 30cm. The melt surface of the middle chamber is covered with white carbon, and the thickness of the covering layer is 30cm. The white carbon in the middle chamber is removed every 75 minutes (leaving 3cm thick white carbon), and then quickly covered with new white carbon. The melt temperature in the casting furnace is controlled at 1155℃ for horizontal casting. The cast billet is sawed to a fixed size to obtain an oxygen-free copper tube billet with uniform structure and excellent performance.

[0022] Embodiment 2: Reference Figure 1 A preparation method for improving the structure and performance of horizontal continuous casting oxygen-free copper tube ingots comprises the following steps: Step S1, raw material preparation: prepare cathode copper and rare earth metal according to the setting, remove oil and oxidation spots from the cathode copper, and ensure that the cathode copper is clean and has no surface oxidation. Rare earth yttrium is added in the form of copper-yttrium master alloy at 0.06% of the total mass of the raw materials, and the oxide scale is removed before adding.

[0023] Step S2, smelting: adding cathode copper into the smelting furnace in batches for melting, covering with charcoal during the melting process, the thickness of the charcoal layer is maintained at 25 cm, and the temperature of the smelting furnace is 1190°C; after the cathode copper is completely melted, wait for 15 minutes before properly slagging, so that the content of impurity elements such as oxygen, phosphorus, sulfur, and iron in the melt is below 10ppm.

[0024] Step S3, refining and modification: after the contents of impurity elements such as oxygen, phosphorus, sulfur, and iron in the melt are qualified, the prepared copper-yttrium master alloy blocks with a size of about 20 mm are evenly dispersed into the melt, and after waiting for 12 minutes, the slag is properly removed, and then the melt temperature is increased to 1200°C and then transferred to the casting furnace.

[0025] Step S4, horizontal casting: The melt surface of the front chamber and the rear chamber of the casting furnace is covered with flake graphite, and the thickness of the covering layer is 30cm. The melt surface of the middle chamber is covered with white carbon, and the thickness of the covering layer is 30cm. The white carbon in the middle chamber is removed every 75 minutes (leaving 3cm thick white carbon), and then quickly covered with new white carbon. The melt temperature in the casting furnace is controlled at 1160℃ for horizontal casting. The cast billet is sawed to a fixed size to obtain an oxygen-free copper tube billet with uniform structure and excellent performance.

[0026] Embodiment 3: Reference Figure 1 A preparation method for improving the structure and performance of horizontal continuous casting oxygen-free copper tube ingots comprises the following steps: Step S1, raw material preparation: cathode copper and rare earth metal are prepared according to the setting, and the cathode copper is degreased and oxidized to ensure that the cathode copper is clean and has no surface oxidation. Rare earth yttrium is added in the form of copper-yttrium master alloy at 0.09% of the total mass of the raw materials, and the oxide scale is removed before adding.

[0027] Step S2, smelting: adding cathode copper into the smelting furnace in batches for melting, covering with charcoal during the melting process, the thickness of the charcoal layer is maintained at 25 cm, and the temperature of the smelting furnace is 1190°C; after the cathode copper is completely melted, wait for 15 minutes before properly slagging, so that the content of impurity elements such as oxygen, phosphorus, sulfur, and iron in the melt is below 10ppm.

[0028] Step S3, refining and modification: after the contents of impurity elements such as oxygen, phosphorus, sulfur, and iron in the melt are qualified, the prepared copper-yttrium master alloy blocks with a size of about 20 mm are evenly dispersed into the melt, and after waiting for 15 minutes, the slag is properly removed, and then the melt temperature is increased to 1200°C and then transferred to the casting furnace.

[0029] Step S4, horizontal casting: The melt surface of the front chamber and the rear chamber of the casting furnace is covered with flake graphite, and the thickness of the covering layer is 30cm. The melt surface of the middle chamber is covered with charcoal, and the thickness of the covering layer is 30cm. The white charcoal in the middle chamber is removed every 75 minutes (leaving 3cm thick white charcoal), and then quickly covered with new white charcoal. The melt temperature in the casting furnace is controlled at 1165℃ for horizontal casting. The cast billet is sawed to a fixed size to obtain an oxygen-free copper tube billet with uniform structure and excellent performance.

[0030] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A preparation method for improving the structure and performance of horizontal continuous casting oxygen-free copper tube ingot, characterized in that; The following steps are involved: Step S1, raw material preparation: preparing cathode copper and rare earth metal; The rare earth metal is added in the form of copper-rare earth master alloy at 0.01%-0.10% of the total mass of the raw materials, and the oxide scale is removed before adding; Step S2, smelting: adding cathode copper into a smelting furnace in batches for melting, covering with charcoal during the melting process, the thickness of the charcoal layer is maintained at 20 cm-30 cm, and the temperature of the smelting furnace is controlled at 1185° C.-1200° C.; After the cathode copper is completely melted, wait for 10-20 minutes before properly removing the slag; Step S3, refining and modification: after the contents of oxygen, phosphorus, sulfur and iron impurity elements in the melt are qualified, the prepared copper-rare earth master alloy block is uniformly and dispersedly added into the melt, and slag is properly removed after waiting for 10-15 minutes, and then the melt temperature is increased by about 10°C and then transferred into the casting furnace; Step S4, horizontal casting: the melt surface of the fore chamber and the hind chamber of the casting furnace is covered with flake graphite, and the thickness of the covering layer is 20cm-30cm; The surface of the melt in the middle chamber is covered with charcoal, and the thickness of the covering layer is 20cm-30cm; Remove the charcoal from the middle chamber every once in a while and cover it with new charcoal. The melt temperature in the casting furnace is controlled at 1155°C-1165°C for horizontal drawing, and the drawn ingot is sawn to a fixed size to obtain an oxygen-free copper tube ingot with uniform structure and excellent performance.

2. A method for improving the structure and performance of horizontal continuous casting oxygen-free copper tube ingot according to claim 1, characterized in that: In step S1, the cathode copper needs to be degreased and oxidized spots removed to ensure that the cathode copper is clean and free of oxidation.

3. The method for improving the structure and performance of horizontal continuous casting oxygen-free copper tube ingot according to claim 1, characterized in that: In step S1, the rare earth metal is one of yttrium and lanthanum, and the rare earth content in the copper-rare earth master alloy is 10%-20%.

4. The method for improving the structure and performance of horizontal continuous casting oxygen-free copper tube ingot according to claim 1, characterized in that: In step S2, when the cathode copper is completely melted, samples are then taken to detect whether the contents of impurity elements such as oxygen, phosphorus, sulfur, and iron in the melt are below the specified values; If it is too high, replace the covering charcoal in time and extend the waiting time after melting.

5. A preparation method for improving the structure and performance of horizontal continuous casting oxygen-free copper tube ingot according to claim 4, characterized in that: In step S2, the impurity element content is specified to be 5ppm-15ppm.

6. The method for improving the microstructure and performance of horizontal continuous casting oxygen-free copper tube ingot according to claim 1, characterized in that: In step S3, the size of the rare earth master alloy block is 15 mm-35 mm.

7. The method for improving the microstructure and performance of horizontal continuous casting oxygen-free copper tube ingot according to claim 1, characterized in that: In step S4, the charcoal in the middle of the chamber is removed at regular intervals. More specifically, 2 cm to 3 cm of charcoal is left and then covered with new charcoal.

8. The method for improving the microstructure and performance of horizontal continuous casting oxygen-free copper tube ingot according to claim 1, characterized in that: In step S4, the charcoal is white charcoal with a particle size of 20 mm to 40 mm.

9. The method for improving the microstructure and performance of horizontal continuous casting oxygen-free copper tube ingot according to claim 1, characterized in that: In step S4, the period of time is 60 minutes to 90 minutes.

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