Preparation method of aluminum-copper alloy evaporation material

Abstract

The invention belongs to the field of evaporation material preparation, and discloses a preparation method of an aluminum-copper alloy evaporation material. Comprising the following steps that (1) the aluminum-copper alloy is placed in an extrusion die to be subjected to hot extrusion treatment, and an aluminum-copper alloy bar is obtained; (2) the aluminum-copper alloy bar is sequentially subjected to annealing treatment, pointing and drawing treatment, and an aluminum-copper alloy wire is obtained; (3) the aluminum-copper alloy wire is sheared and granulated, the sheared portion of the aluminum-copper alloy wire is heated while shearing is conducted, the heating temperature is set to be 60-80 DEG C, and aluminum-copper alloy particles are obtained after shearing; and (4) cleaning and drying the copper-aluminum alloy particles to obtain the aluminum-copper alloy evaporation material. The preparation method is simple and easy to operate, and the flatness of the end face of the aluminum-copper evaporation material during shearing is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of evaporation material preparation, and more specifically, relates to a method for preparing an aluminum-copper alloy evaporation material. Background Art

[0002] The film layer formed by evaporation of aluminum-copper alloy evaporation material has good conductivity. The addition of copper hinders the diffusion effect of aluminum atoms, increases the current resistance of aluminum, greatly reduces the possibility of electromigration, and is of certain significance to improving the life of the film layer.

[0003] The production process of high-purity aluminum-copper evaporation materials is generally to melt high-purity aluminum and high-purity copper into alloys, hot extrude them into rods, and then draw them to the required size for shearing, cleaning, etc. During shearing, due to the poor plasticity and toughness of aluminum-copper alloys, the sheared end faces are often uneven, with many burrs, and even microcracks.

[0004] The patent with publication number CN112916630A discloses a plastic processing method for aluminum-copper alloy evaporation material, including extrusion processing and drawing processing performed in sequence; the extrusion processing includes single-pass extrusion; the cross-sectional deformation of the single-pass extrusion is 90-96%; the drawing processing includes multi-pass drawing; each pass of the multi-pass drawing is independently single-mode drawing. However, this invention only overcomes the problem of poor plastic toughness of aluminum-copper alloy in the extrusion and drawing process, avoids the phenomenon of cracking of rods or breaking of wires, and is not suitable for the end surface quality problem caused by shearing of aluminum-copper alloy wire.

[0005] Therefore, it is necessary to explore a method to improve the burrs, microcracks and other problems generated when the aluminum-copper alloy wire is sheared. Summary of the invention

[0006] In view of the above problems existing in the prior art, the purpose of the present invention is to provide a method for preparing an aluminum-copper alloy evaporation material, which can effectively improve the problems of burrs, microcracks and other problems generated when the aluminum-copper alloy wire is sheared.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: A method for preparing an aluminum-copper alloy evaporation material comprises the following steps: (1) placing the aluminum-copper alloy in an extrusion die and performing hot extrusion treatment to obtain an aluminum-copper alloy rod; (2) The aluminum-copper alloy rod is subjected to annealing treatment, sharpening treatment, and drawing treatment in sequence to obtain an aluminum-copper alloy wire; (3) Shearing and pelletizing the aluminum-copper alloy wire, and heating the sheared portion of the aluminum-copper alloy wire while shearing, with the heating temperature set to 60-80° C. to obtain aluminum-copper alloy particles after shearing; (4) The copper-aluminum alloy particles are cleaned and dried to obtain aluminum-copper alloy evaporation material.

[0008] Preferably, in step (1), the copper content in the aluminum-copper alloy is 0.2-6wt%; the aluminum-copper alloy is prepared by smelting and casting high-purity aluminum and high-purity copper.

[0009] Preferably, high purity aluminum and high purity copper are added into the crucible of the smelting furnace, and the vacuum degree is drawn to 10 -2 After that, high-purity argon is filled in and heated to 800±50℃, and high-purity aluminum and high-purity copper dissolve into each other to form aluminum-copper alloy.

[0010] Further preferably, the smelted aluminum-copper alloy is cast into an aluminum-copper alloy ingot of a desired size.

[0011] The diameter requirement of the aluminum-copper alloy ingot is generally determined by the feed size of the extrusion port of the extruder used. Further preferably, the diameter requirement of the aluminum-copper alloy ingot is φ60~150mm, and the length requirement is ≥100mm.

[0012] Preferably, in step (1): The temperature of the hot extrusion treatment is 350-450°C, more preferably 400-450°C; The duration of hot extrusion treatment is 10~30min; The extrusion speed is 1~3 mm / s; The diameter of the aluminum-copper alloy rod is 8~10mm.

[0013] More preferably, the annealing temperature is 350-450°C.

[0014] Preferably, the annealing treatment in step (2) is as follows: heating the aluminum-copper alloy rod to 350-450° C. and keeping the temperature for 30-60 min.

[0015] Preferably, the sharpening treatment in step (2) is: performing sharpening treatment on one end of the aluminum-copper alloy rod after annealing.

[0016] Further preferably, the diameter of the aluminum-copper alloy rod at one end after being rolled to the point is 7-7.5 mm; the length of the rolled point is 100-200 mm.

[0017] Preferably, in the drawing process of step (2): The single drawing deformation is 7-20%, preferably 10-20%; The drawing speed is 100~250m / s; The diameter of aluminum-copper alloy wire is 1~9mm.

[0018] Preferably, an intermediate annealing treatment is provided in the drawing process of step (2); the temperature of the intermediate annealing is 150-250°C, more preferably 150-200°C.

[0019] Preferably, the intermediate annealing time is 20 to 30 minutes.

[0020] Further preferably, after the deformation of the aluminum-copper alloy rod exceeds 40% and 70%, respectively, an intermediate annealing treatment is performed.

[0021] Preferably, in step (3), the heating method is induction coil heating.

[0022] Preferably, the cut particle length is 3-15 mm, and the cutting speed is 50-250 pcs / min.

[0023] Preferably, in step (4), the cleaning method is: the aluminum-copper alloy particles are sequentially placed in a mixture of concentrated nitric acid and hydrofluoric acid in a volume ratio of 15 to 25:5, deionized water, and ethanol for cleaning.

[0024] Preferably, the aluminum-copper alloy particles are taken out after the metallic luster appears, and are immediately rinsed under running deionized water for 3 to 5 minutes.

[0025] Further preferably, the aluminum-copper alloy particles are immersed in a mixed solution of concentrated nitric acid and hydrofluoric acid in a volume ratio of 15-25:5 and stirred for 5-10 minutes. After the aluminum-copper alloy particles develop a metallic luster, they are taken out and immediately rinsed under running deionized water for 3-5 minutes, and then ultrasonically cleaned in ethanol that can cover the particles for 5-10 minutes.

[0026] Preferably, the drying temperature is 40-60° C. and the drying time is 2-4 hours.

[0027] More preferably, the mixture is placed in a vacuum drying oven for drying.

[0028] Compared with the prior art, the present invention has the following beneficial effects: Compared with the TMP thermal deformation process commonly used in the industry, the present invention adopts hot extrusion to obtain aluminum-copper alloy wire, optimizes the process route, improves production efficiency, saves production costs, and avoids phenomena such as material cracking that are prone to occur in traditional TMP processes; at the same time, the preparation method of the present invention is simple and easy to operate, and can effectively improve the burrs, microcracks and other problems generated by the aluminum-copper alloy wire during shearing, and has low cost. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and carefully in combination with preferred embodiments below, but the protection scope of the present invention is not limited to the following specific embodiments.

[0030] Unless otherwise defined, all the professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0031] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0032] Example 1 This embodiment provides a method for preparing an aluminum-copper alloy evaporation material, comprising the following steps: According to the copper content of 0.5wt%, weigh the aluminum ingot with a purity of 5N5 and the copper particles with a purity of 5N, put them into the crucible of the vacuum melting furnace after cleaning, and adjust the vacuum degree of the vacuum continuous casting furnace to 1*10 -2 Pa, fill with high-purity argon gas, raise the gas pressure in the vacuum melting furnace to 0.08MPa, stop filling with argon gas and raise the temperature to 810℃, melt for 10min, turn on the vacuum pump for vibration casting, the casting time is 50~80s, and the size of the cast ingot is D100*500mm.

[0033] The shrinkage holes produced by casting are sawed off with a sawing machine, and the outer skin is turned off. The size of the processed aluminum-copper alloy bar is D90*400mm.

[0034] The obtained aluminum-copper alloy rod is placed in an extrusion die, and then placed in a vacuum annealing furnace for heating to 400° C. and kept warm for 20 minutes.

[0035] The aluminum-copper alloy rod is extruded into an aluminum-copper alloy rod with a specification of φ8 mm at an extrusion speed of 3 mm / s using an extruder.

[0036] Place the φ8mm aluminum-copper alloy rod in a vacuum annealing furnace, heat it to 400℃ and keep it warm for 60 minutes, then cool it to room temperature and take it out.

[0037] One end of the annealed aluminum-copper alloy rod is sharpened until the diameter of one end of the aluminum-copper alloy rod is 7-7.5 mm; the length of the sharpening is 100 mm.

[0038] The pointed rods were drawn using a wire drawing machine at a drawing speed of 200 m / s and a single deformation of 13%. The drawing was repeated until the rod diameter became 3 mm. After the deformation exceeded 40% and 70%, intermediate annealing was performed at a temperature of 200 °C and a time of 20 min.

[0039] The aluminum-copper alloy wire prepared above was straightened, heated and cut on a cutting machine equipped with an induction coil. The temperature of the induction coil was 60° C., the cutting speed was 200 pcs / min, and the cutting length was 3 mm.

[0040] The cut aluminum-copper alloy particles were placed in a mixed acid of concentrated nitric acid and hydrofluoric acid in a volume ratio of 3:1 and stirred for 6 minutes. Then, they were rinsed under running deionized water for 3 minutes. Then, they were ultrasonically cleaned in ethanol that could cover the particles for 10 minutes. Finally, they were placed in a vacuum drying oven for drying at a temperature of 60°C and a drying time of 3 hours.

[0041] Example 2 This embodiment provides a method for preparing an aluminum-copper alloy evaporation material, comprising the following steps: According to the copper content of 0.5wt%, weigh the aluminum ingot with a purity of 5N5 and the copper particles with a purity of 5N, put them into the crucible of the vacuum melting furnace after cleaning, and adjust the vacuum degree of the vacuum continuous casting furnace to 1*10 -2 Pa, fill with high-purity argon gas, raise the gas pressure in the vacuum melting furnace to 0.08MPa, stop filling with argon gas and raise the temperature to 810℃, melt for 10min, turn on the vacuum pump for vibration casting, the casting time is 50~80s, and the size of the cast ingot is D140*500mm.

[0042] The shrinkage holes produced by casting are cut off with a sawing machine, and the outer skin is removed by lathing. The size of the processed aluminum-copper alloy bar is D130*400mm. The obtained aluminum-copper alloy rod is placed in an extrusion die, and then placed in a vacuum annealing furnace for heating to 400° C. and kept warm for 20 minutes.

[0043] The aluminum-copper alloy rod is extruded into an aluminum-copper alloy rod with a specification of φ8 mm at an extrusion speed of 3 mm / s using an extruder.

[0044] Place the φ8mm aluminum-copper alloy rod in a vacuum annealing furnace, heat it to 400℃ and keep it warm for 60 minutes, then cool it to room temperature and take it out.

[0045] One end of the annealed aluminum-copper alloy rod is sharpened until the diameter of one end of the aluminum-copper alloy rod is 7-7.5 mm; the length of the sharpening is 100 mm.

[0046] The pointed rods were drawn using a wire drawing machine at a drawing speed of 200 m / s and a single deformation of 13%. The drawing was repeated until the rod diameter became 3 mm. After the deformation exceeded 40% and 70%, intermediate annealing was performed at a temperature of 200 °C and a time of 20 min.

[0047] The aluminum-copper alloy wire prepared above was straightened, heated and cut on a cutting machine equipped with an induction coil. The temperature of the induction coil was 80° C., the cutting speed was 200 pcs / min, and the cutting length was 3 mm.

[0048] The cut aluminum-copper alloy particles were placed in a mixed acid of concentrated nitric acid and hydrofluoric acid in a volume ratio of 3:1 and stirred for 6 minutes. Then, they were rinsed under running deionized water for 3 minutes. Then, they were ultrasonically cleaned in ethanol that could cover the particles for 10 minutes. Finally, they were placed in a vacuum drying oven for drying at a temperature of 60°C and a drying time of 3 hours.

[0049] Example 3 This embodiment provides a method for preparing an aluminum-copper alloy evaporation material, comprising the following steps: According to the copper content of 2wt%, weigh the aluminum ingot with a purity of 5N5 and the copper particles with a purity of 5N, put them into the crucible of the vacuum melting furnace after cleaning, and adjust the vacuum degree of the vacuum continuous casting furnace to 1*10 -2 Pa, fill with high-purity argon gas, raise the gas pressure in the vacuum melting furnace to 0.08MPa, stop filling with argon gas and raise the temperature to 810℃, melt for 10min, turn on the vacuum pump for vibration casting, the casting time is 50~80s, and the size of the cast ingot is D100*500mm.

[0050] The shrinkage holes produced by casting are sawed off with a sawing machine, and the outer skin is turned off. The size of the processed aluminum-copper alloy bar is D90*400mm.

[0051] The obtained aluminum-copper alloy rod is placed in an extrusion die, and then placed in a vacuum annealing furnace for heating to 400° C. and kept warm for 20 minutes.

[0052] The aluminum-copper alloy rod is extruded into an aluminum-copper alloy rod with a specification of φ8 mm at an extrusion speed of 3 mm / s using an extruder.

[0053] Place the φ8mm aluminum-copper alloy rod in a vacuum annealing furnace, heat it to 350℃ and keep it warm for 60 minutes, then cool it to room temperature and take it out.

[0054] One end of the annealed aluminum-copper alloy rod is sharpened until the diameter of one end of the aluminum-copper alloy rod is 7-7.5 mm; the length of the sharpening is 100 mm.

[0055] The pointed rods were drawn using a wire drawing machine at a drawing speed of 200 m / s and a single deformation of 13%. The drawing was repeated until the rod diameter became 3 mm. After the deformation exceeded 40% and 70%, intermediate annealing was performed at a temperature of 200 °C and a time of 20 min.

[0056] The aluminum-copper alloy wire prepared above was straightened, heated and cut on a cutting machine equipped with an induction coil. The temperature of the induction coil was 60° C., the cutting speed was 200 pcs / min, and the cutting length was 6 mm.

[0057] The cut aluminum-copper alloy particles were placed in a mixed acid of concentrated nitric acid and hydrofluoric acid in a volume ratio of 3:1 and stirred for 6 minutes. Then, they were rinsed under running deionized water for 3 minutes. Then, they were ultrasonically cleaned in ethanol that could cover the particles for 10 minutes. Finally, they were placed in a vacuum drying oven for drying at a temperature of 60°C and a drying time of 3 hours.

[0058] Example 4 This embodiment provides a method for preparing an aluminum-copper alloy evaporation material, comprising the following steps: According to the copper content of 2wt%, weigh the aluminum ingot with a purity of 5N5 and the copper particles with a purity of 5N, put them into the crucible of the vacuum melting furnace after cleaning, and adjust the vacuum degree of the vacuum continuous casting furnace to 1*10 -2 Pa, fill with high-purity argon gas, raise the gas pressure in the vacuum melting furnace to 0.08MPa, stop filling with argon gas and raise the temperature to 810℃, melt for 10min, turn on the vacuum pump for vibration casting, the casting time is 50~80s, and the size of the cast ingot is D140*500mm.

[0059] The shrinkage holes produced by casting are sawed off with a sawing machine, and the outer skin is turned off. The size of the processed aluminum-copper alloy bar is D130*400mm.

[0060] The obtained aluminum-copper alloy rod is placed in an extrusion die, and then placed in a vacuum annealing furnace for heating to 400° C. and kept warm for 20 minutes.

[0061] The aluminum-copper alloy rod is extruded into an aluminum-copper alloy rod with a specification of φ8 mm at an extrusion speed of 3 mm / s using an extruder.

[0062] Place the φ8mm aluminum-copper alloy rod in a vacuum annealing furnace, heat it to 400℃ and keep it warm for 60 minutes, then cool it to room temperature and take it out.

[0063] One end of the annealed aluminum-copper alloy rod is sharpened until the diameter of one end of the aluminum-copper alloy rod is 7-7.5 mm; the length of the sharpening is 100 mm.

[0064] The pointed rods were drawn using a wire drawing machine at a drawing speed of 200 m / s and a single deformation of 10%. The drawing was repeated until the rod diameter became 3 mm. After the deformation exceeded 40% and 70%, intermediate annealing was performed at a temperature of 200 °C and a time of 20 min.

[0065] The aluminum-copper alloy wire prepared above was straightened, heated and cut on a cutting machine equipped with an induction coil. The temperature of the induction coil was 80° C., the cutting speed was 200 pcs / min, and the cutting length was 6 mm.

[0066] The cut aluminum-copper alloy particles were placed in a mixed acid of concentrated nitric acid and hydrofluoric acid in a volume ratio of 3:1 and stirred for 6 minutes. Then, they were rinsed under running deionized water for 3 minutes. Then, they were ultrasonically cleaned in ethanol that could cover the particles for 10 minutes. Finally, they were placed in a vacuum drying oven for drying at a temperature of 60°C and a drying time of 3 hours.

[0067] Example 5 This embodiment provides a method for preparing an aluminum-copper alloy evaporation material, comprising the following steps: According to the copper content of 4wt%, weigh the aluminum ingot with a purity of 5N5 and the copper particles with a purity of 5N, put them into the crucible of the vacuum melting furnace after cleaning, and adjust the vacuum degree of the vacuum continuous casting furnace to 1*10 -2 Pa, fill with high-purity argon gas, raise the gas pressure in the vacuum melting furnace to 0.08MPa, stop filling with argon gas and raise the temperature to 810℃, melt for 10min, turn on the vacuum pump for vibration casting, the casting time is 50~80s, and the size of the cast ingot is D100*500mm.

[0068] The shrinkage holes produced by casting are sawed off with a sawing machine, and the outer skin is turned off. The size of the processed aluminum-copper alloy bar is D90*400mm.

[0069] The obtained aluminum-copper alloy rod is placed in an extrusion die, and then placed in a vacuum annealing furnace for heating to 400° C. and kept warm for 20 minutes.

[0070] The aluminum-copper alloy rod is extruded into an aluminum-copper alloy rod with a specification of φ8 mm at an extrusion speed of 3 mm / s using an extruder.

[0071] Place the φ8mm aluminum-copper alloy rod in a vacuum annealing furnace, heat it to 400℃ and keep it warm for 60 minutes, then cool it to room temperature and take it out.

[0072] One end of the annealed aluminum-copper alloy rod is sharpened until the diameter of one end of the aluminum-copper alloy rod is 7-7.5 mm; the length of the sharpening is 100 mm.

[0073] The pointed rods were drawn using a wire drawing machine at a drawing speed of 200 m / s and a single deformation of 20%. The drawing was repeated until the rod diameter became 3 mm. After the deformation exceeded 40% and 70%, intermediate annealing was performed at a temperature of 150 °C and a time of 20 min.

[0074] The aluminum-copper alloy wire prepared above was straightened, heated and cut on a cutting machine equipped with an induction coil. The temperature of the induction coil was 60° C., the cutting speed was 200 pcs / min, and the cutting length was 9 mm.

[0075] The cut aluminum-copper alloy particles were placed in a mixed acid of concentrated nitric acid and hydrofluoric acid in a volume ratio of 3:1 and stirred for 6 minutes. Then, they were rinsed under running deionized water for 3 minutes. Then, they were ultrasonically cleaned in ethanol that could cover the particles for 10 minutes. Finally, they were placed in a vacuum drying oven for drying at a temperature of 60°C and a drying time of 3 hours.

[0076] Example 6 This embodiment provides a method for preparing an aluminum-copper alloy evaporation material, comprising the following steps: According to the copper content of 4wt%, weigh the aluminum ingot with a purity of 5N5 and the copper particles with a purity of 5N, put them into the crucible of the vacuum melting furnace after cleaning, and adjust the vacuum degree of the vacuum continuous casting furnace to 1*10 -2 Pa, fill with high-purity argon gas, raise the gas pressure in the vacuum melting furnace to 0.08MPa, stop filling with argon gas and raise the temperature to 810℃, melt for 10min, turn on the vacuum pump for vibration casting, the casting time is 50~80s, and the size of the cast ingot is D140*500mm.

[0077] The shrinkage holes produced by casting are sawed off with a sawing machine, and the outer skin is turned off. The size of the processed aluminum-copper alloy bar is D130*400mm.

[0078] The obtained aluminum-copper alloy rod was placed in an extrusion die, and then placed in a vacuum annealing furnace for heating to 450° C. and kept warm for 20 minutes.

[0079] The aluminum-copper alloy rod is extruded into an aluminum-copper alloy rod with a specification of φ8 mm at an extrusion speed of 3 mm / s using an extruder.

[0080] Place the φ8mm aluminum-copper alloy rod in a vacuum annealing furnace, heat it to 400℃ and keep it warm for 60 minutes, then cool it to room temperature and take it out.

[0081] One end of the annealed aluminum-copper alloy rod is sharpened until the diameter of one end of the aluminum-copper alloy rod is 7-7.5 mm; the length of the sharpening is 100 mm.

[0082] The pointed rods were drawn using a wire drawing machine at a drawing speed of 200 m / s and a single deformation of 13%. The drawing was repeated until the rod diameter became 3 mm. After the deformation exceeded 40% and 70%, intermediate annealing was performed at a temperature of 200 °C and a time of 20 min.

[0083] The aluminum-copper alloy wire prepared above was straightened, heated and cut on a cutting machine equipped with an induction coil. The temperature of the induction coil was 80° C., the cutting speed was 200 pcs / min, and the cutting length was 9 mm.

[0084] The cut aluminum-copper alloy particles were placed in a mixed acid of concentrated nitric acid and hydrofluoric acid in a volume ratio of 3:1 and stirred for 6 minutes. Then, they were rinsed under running deionized water for 3 minutes. Then, they were ultrasonically cleaned in ethanol that could cover the particles for 10 minutes. Finally, they were placed in a vacuum drying oven for drying at a temperature of 60°C and a drying time of 3 hours.

[0085] Example 7 It is basically the same as Example 2, except that the temperature of the hot extrusion treatment is set to 350°C: The obtained aluminum-copper alloy rod and the extrusion die were placed in a vacuum annealing furnace, heated to 350°C and kept warm for 20 minutes.

[0086] The aluminum-copper alloy rod is extruded into an aluminum-copper alloy rod with a specification of φ8 mm at an extrusion speed of 3 mm / s using an extruder.

[0087] Compared with Example 2, the extrusion annealing temperature of this embodiment is lowered, which saves equipment heating time and power usage, but there is a phenomenon of being more difficult to extrude, which in turn reduces the extrusion efficiency and has a greater impact on the equipment.

[0088] Example 8 It is basically the same as Example 4, except that the single deformation during drawing is reduced from 13% to 7%: The pointed rods were drawn using a wire drawing machine at a drawing speed of 200 m / s and a single deformation of 7%. The drawing was repeated until the rod diameter became 3 mm. After the deformation exceeded 40% and 70%, intermediate annealing was performed at a temperature of 200 °C and a time of 20 min.

[0089] Compared with Example 4, this embodiment reduces the single deformation amount of drawing and improves the wire yield rate during the material drawing process. However, the material drawing passes are more and the drawing takes a long time, which greatly increases the processing cost of this process and is not conducive to industrial production.

[0090] Example 9 It is basically the same as Example 6, except that the intermediate annealing temperature during drawing is adjusted to 250°C: The pointed rods were drawn using a wire drawing machine at a drawing speed of 200 m / s and a single deformation of 13%. The drawing was repeated until the rod diameter became 3 mm. After the deformation exceeded 40% and 70%, intermediate annealing was performed at a temperature of 250 °C and a time of 20 min.

[0091] Compared with Example 6, the wire yield rate during drawing in this embodiment is slightly improved, but the equipment power is increased, the production efficiency is reduced, and the production cost of this process is increased.

[0092] Example 10 The same as Example 1, except that the temperature of the hot extrusion treatment is set to 450°C: The obtained aluminum-copper alloy rod was placed in an extrusion die, and then placed in a vacuum annealing furnace for heating to 450° C. and kept warm for 20 minutes.

[0093] The aluminum-copper alloy rod is extruded into an aluminum-copper alloy rod with a specification of φ8 mm at an extrusion speed of 3 mm / s using an extruder.

[0094] Compared with Example 1, the annealing temperature during extrusion in this embodiment is increased, and the actual extrusion effect is not significantly improved compared with Example 1. Instead, the processing time and production cost are increased, which brings unnecessary burden to the enterprise production.

[0095] Comparative Example 1 It is basically the same as Example 1, except that no induction coil heating is provided during straightening and shearing: The aluminum-copper alloy wire prepared above was straightened and cut on a cutting machine with a cutting speed of 200 pcs / min and a cutting length of 3 mm.

[0096] Compared with Example 1, this comparative example does not include induction heating, and burrs exist on the end faces of the particles obtained by shearing.

[0097] Comparative Example 2 It is basically the same as Example 3, except that no induction coil heating is provided during straightening and shearing: The aluminum-copper alloy wire obtained above was straightened and cut on a cutting machine with a cutting speed of 200 pcs / min and a cutting length of 6 mm.

[0098] Compared with Example 3, this comparative example does not include induction heating, and burrs exist on the end faces of the particles obtained by shearing.

[0099] Comparative Example 3 It is basically the same as Example 5, except that no induction coil heating is provided during straightening and shearing: The aluminum-copper alloy wire obtained above was straightened and cut on a cutting machine with a cutting speed of 200 pcs / min and a cutting length of 9 mm.

[0100] Compared with Example 5, this comparative example does not include induction heating, and burrs exist on the end faces of the particles obtained by shearing.

[0101] Comparative Example 4 The same as Example 2, except that the temperature of the hot extrusion treatment is set to 500°C: The obtained aluminum-copper alloy rod and the extrusion die were placed in a vacuum annealing furnace, heated to 500°C and kept warm for 20 minutes.

[0102] The aluminum-copper alloy rod is extruded into an aluminum-copper alloy rod with a specification of φ8 mm at an extrusion speed of 3 mm / s using an extruder.

[0103] Compared with Example 2, the annealing temperature during extrusion was increased in this comparative example, resulting in a significant increase in the fluidity of the material during extrusion, and the material could not be extruded into wires through the extruder.

[0104] Comparative Example 5 It is basically the same as Example 4, except that the single deformation during drawing is increased to 23%: The pointed rods were drawn using a wire drawing machine at a drawing speed of 200 m / s and a single deformation of 23%. The drawing was repeated until the rod diameter became 3 mm. After the deformation exceeded 40% and 70%, intermediate annealing was performed at a temperature of 200 °C and a time of 20 min.

[0105] Compared with Example 4, although the present comparative example reduces the number of drawing passes, the material has a larger single deformation amount, the temperature rises faster during drawing, there is a higher risk of wire breakage, and the product yield rate is reduced.

[0106] Comparative Example 6 It is basically the same as Example 6, except that the intermediate annealing temperature during drawing is adjusted to 130°C: The pointed rods were drawn using a wire drawing machine at a drawing speed of 200 m / s and a single deformation of 13%. The drawing was repeated until the rod diameter became 3 mm. After the deformation exceeded 40% and 70%, intermediate annealing was performed at a temperature of 130 °C and a time of 20 min.

[0107] Compared with Example 6, this comparative example reduces the intermediate annealing temperature during drawing. Although it saves equipment energy consumption and production costs, the wire is very likely to crack or even break during drawing, reducing the product yield.

[0108] Comparative Example 7 The same as Example 5, except that the heating temperature of the shearing part is adjusted to 50°C: The aluminum-copper alloy wire prepared above was straightened, heated and cut on a cutting machine equipped with an induction coil. The temperature of the induction coil was 50° C., the cutting speed was 200 pcs / min, and the cutting length was 3 mm.

[0109] Compared with Example 5, the temperature of shear heating was lowered in this comparative example, but the material properties were not significantly improved, and the actual shear effect was poor.

[0110] Comparative Example 8 The same as Example 7, except that the heating temperature of the shearing part is adjusted to 100°C: The aluminum-copper alloy wire prepared above was straightened, heated and cut on a cutting machine equipped with an induction coil. The temperature of the induction coil was 50° C., the cutting speed was 200 pcs / min, and the cutting length was 3 mm.

[0111] Compared with Example 7, the temperature of shear heating is increased in this comparative example, the material is softer during shearing, and part of the material is severely deformed during actual shearing.

[0112] Performance Test: The yield and quality of the evaporation materials prepared in the examples and comparative examples were statistically analyzed, and the performance comparison results were obtained as shown in Table 1: Table 1 Result analysis: It can be seen from Examples 1 to 10 and Comparative Examples 1 to 3 that by using the technical solution of the present application and further arranging induction coil heating, the burrs on the end faces of the aluminum-copper alloy particles obtained by shearing are greatly reduced, and the plasticity and toughness of the aluminum-copper alloy are significantly improved.

[0113] It can be seen from Comparative Examples 4 to 8 that there is still room for improvement in the material yield by adjusting some data of the aluminum-copper alloy production process. At the same time, for industrial production, it is more necessary to consider the actual production cost and efficiency.

[0114] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention.

Claims

1. A method for preparing an aluminum-copper alloy evaporation material, characterized in that: The following steps are involved: (1) placing the aluminum-copper alloy in an extrusion die and performing hot extrusion treatment to obtain an aluminum-copper alloy rod; (2) The aluminum-copper alloy rod is subjected to annealing treatment, sharpening treatment, and drawing treatment in sequence to obtain an aluminum-copper alloy wire; (3) Shearing and pelletizing the aluminum-copper alloy wire, and heating the sheared portion of the aluminum-copper alloy wire while shearing, with the heating temperature set to 60-80° C. to obtain aluminum-copper alloy particles after shearing; (4) The copper-aluminum alloy particles are cleaned and dried to obtain aluminum-copper alloy evaporation material.

2. The preparation method according to claim 1, characterized in that In step (1), the copper content in the aluminum-copper alloy is 0.2-6wt%; the preparation method of the aluminum-copper alloy is: preparing high-purity aluminum and high-purity copper by smelting and casting.

3. The preparation method according to claim 1, characterized in that: In step (1): The temperature of the hot extrusion treatment is 350-450°C, preferably 400-450°C; The duration of hot extrusion treatment is 10~30min; The extrusion speed is 1~3 mm / s; The diameter of the aluminum-copper alloy rod is 8~10mm.

4. The preparation method according to claim 1, characterized in that: In step (2): The temperature of annealing treatment is 350~450℃; The annealing treatment time is 30~60min.

5. The preparation method according to claim 1, characterized in that: The sharpening treatment in step (2) is: performing sharpening treatment on one end of the aluminum-copper alloy bar after annealing; Preferably, the diameter of the aluminum-copper alloy rod at one end after being rolled to the point is 7-7.5 mm; the length of the rolled point is 100-200 mm.

6. The preparation method according to claim 1, characterized in that: During the drawing process in step (2): The single drawing deformation is 7~20%, preferably 10~20%; The drawing speed is 100~250m / s; The diameter of aluminum-copper alloy wire is 1~9mm.

7. The preparation method according to claim 6, characterized in that: An intermediate annealing treatment is provided during the drawing process of step (2); Preferably, the temperature of the intermediate annealing treatment is 150-250°C, more preferably 150-200°C; Preferably, the intermediate annealing treatment time is 20 to 30 minutes.

8. The preparation method according to claim 7, characterized in that: After the deformation of the aluminum-copper alloy bars exceeds 40% and 70% respectively, intermediate annealing treatment is performed.

9. The preparation method according to claim 1, characterized in that: In step (3), the heating method is induction coil heating; the cutting particle length is 3~15mm, and the cutting speed is 50~250pcs / min.

10. The preparation method according to claim 1, characterized in that: In step (4), the cleaning method is: the aluminum-copper alloy particles are sequentially placed in a mixture of concentrated nitric acid and hydrofluoric acid in a volume ratio of 15 to 25:5, deionized water, and ethanol for cleaning.

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