CN115502606B - Cu/alpha-Al for resistance welding 2 O 3 Preparation method of gradient composite electrode - Google Patents

Cu/alpha-Al for resistance welding 2 O 3 Preparation method of gradient composite electrode Download PDF

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CN115502606B
CN115502606B CN202211255511.9A CN202211255511A CN115502606B CN 115502606 B CN115502606 B CN 115502606B CN 202211255511 A CN202211255511 A CN 202211255511A CN 115502606 B CN115502606 B CN 115502606B
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alpha
blank
pure copper
composite electrode
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CN115502606A (en
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冯博
陈志辉
罗飞翔
周涛
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Jiangxi Copper Technology Research Institute Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/302—Cu as the principal constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/12—Metallic powder containing non-metallic particles
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/02—Coating starting from inorganic powder by application of pressure only
    • C23C24/04—Impact or kinetic deposition of particles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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Abstract

The application discloses a Cu/alpha-Al for resistance welding 2 O 3 Preparation method of gradient composite electrode, which adopts cold spraying technology to axially orient and evenly add Cu/alpha-Al at end part of pure copper blank 2 O 3 Composite powder for realizing axial directional material addition of pure copper blank to obtain nano alpha-Al 2 O 3 The pure copper blank of the end of the dispersion strengthening copper alloy, namely the composite electrode blank, is subjected to die forging forming to obtain Cu/alpha-Al 2 O 3 A gradient composite electrode product. The tail part of the resistance welding composite electrode prepared by the application is pure copper, and the end part is compounded with Cu/alpha-Al 2 O 3 And (3) alloy. Inside dispersion distribution of end material high volume fraction nano-Al 2 O 3 Small particles, which will give the area material excellent in service performance of the resistance welding electrode; the pure copper at the tail provides excellent electric conductivity and heat conductivity, and reduces the price of the raw materials of the whole composite resistance welding electrode.

Description

Cu/alpha-Al for resistance welding 2 O 3 Preparation method of gradient composite electrode
Technical Field
The application relates to the field of cold spray additive manufacturing, and belongs to the field of oxide dispersion strengthening materials. The application provides a preparation method of a gradient composite resistance welding electrode with low cost and high performance, which comprises the steps of adding Cu/alpha-Al at the end part of a copper rod through ball milling, cold spraying and cold heading processes 2 O 3 The material is used for preparing the composite resistance welding electrode.
Background
The resistance welding electrode is a tool for transmitting a welding current to a weldment, applying a welding force, and dissipating heat of a welding area in resistance welding. In the welding process, the electrode is continuously contacted with the workpiece at high temperature and high pressure, which requires higher high-temperature strength and hardness, oxidation resistance and good electric conductivity. As a welding consumable, the annual demand of the resistance welding electrode is notOften large. At present, electrode materials used in the electric resistance welding connection process of low-carbon steel and alloy steel in the field of automobile manufacturing are mainly Cu-Cr alloy, cu-Cr-Zr alloy and Al 2 O 3 Dispersion strengthened copper alloy. For resistance welding of galvanized steel sheets, al 2 O 3 The dispersion strengthening copper alloy has exclusivity, and the dispersion strengthening phase can prevent Zn from diffusing to the electrode, so that the alloying of the surface of the electrode is effectively inhibited, and the service life of the electrode is prolonged.
At present, the related copper alloy raw materials are basically realized in localization, but the product quality is lower. High-end feedstock also relies primarily on importation. In the domestic electric resistance welding electrode market, domestic raw materials mainly adopt low-end application, and certain high-end key processes cannot completely replace imported products. The quality of domestic raw materials is greatly different from that of imported alloy with the same grade, the quality of the raw materials is unstable, and the service life can only reach half of that of imported products. This also results in the price of imported raw materials being continuously maintained at a higher level. In recent years, the related researches on novel electrode materials have been developed by the domestic partial scholars. The service life of the electrode products prepared by some methods is remarkably improved, but the industrialization development of the technologies is limited due to the disadvantages of complex procedures, excessive cost, low yield and the like.
Disclosure of Invention
The embodiment discloses a Cu/alpha-Al for resistance welding 2 O 3 The preparation method of the gradient composite electrode is used for solving any one of the above and other potential problems in the prior art.
In order to achieve the above purpose, the technical scheme of the application is as follows: cu/alpha-Al for resistance welding 2 O 3 Preparation method of gradient composite electrode, which adopts cold spraying technology to deposit Cu/alpha-Al at end of pure copper blank 2 O 3 Composite powder for realizing axial directional material addition of pure copper blank to obtain nano alpha-Al 2 O 3 The pure copper blank of the end of the dispersion strengthening copper alloy, namely the composite electrode blank, is subjected to annealing treatment and then is subjected to die forging forming to obtain Cu/alpha-Al 2 O 3 A gradient composite electrode product.
Further, the preparation method specifically comprises the following steps:
s1) preparing a pure copper blank, and pre-adding an end part of the pure copper blank for pretreatment;
s2) preparation of nano alumina particles reinforced Cu/alpha-Al 2 O 3 Composite powder;
s3) preparing Cu/alpha-Al from S2) 2 O 3 The composite powder is deposited at the end part of the pure copper blank obtained in the step S1) by adopting a cold spraying process, and the pure copper blank rotates around the axial direction of the composite powder in the deposition process, so that the axial uniform directional material adding of the pure copper blank is realized, and the nano alpha-Al is obtained 2 O 3 A pure copper blank of the dispersion strengthening copper alloy end, namely a composite electrode blank;
s4) carrying out stress relief annealing on the composite electrode blank obtained in the S3) and carrying out cold heading forming to obtain Cu/alpha-Al 2 O 3 Gradient composite electrode.
Further, in S1): the pure copper blank is a columnar blank;
the pretreatment is as follows: and carrying out cold heading modification on the pre-material-adding end of the pure copper blank to form a pagoda-shaped end for increasing the surface area of the deposition end, and carrying out sand blasting treatment on the surface of the pagoda-shaped end to improve the bonding strength of the composite contact surface.
Further, the pure copper blank is an oxygen-free copper rod.
Further, the specific process in S2) is as follows:
s2.1) mixing copper powder with nano alpha-Al 2 O 3 Mixing the powder to obtain a mixed material;
s2.2) putting the mixed material and the corundum balls into a ball milling tank together, ball milling for 40-50h, and taking out to obtain the nano Cu/alpha-Al for cold spraying 2 O 3 And (5) compounding powder.
Further, nano alpha-Al in the S2.1) 2 The adding amount of the O3 powder is 0.1-15% of the mass of the composite powder.
Further, the nano alpha-Al 2 O 3 The particle size of the particles is 30-100nm.
Further, the specific process of S3) is as follows:
s3.1) nano Cu/alpha-Al obtained in S2) 2 O 3 Placing the composite powder in cold spraying equipment;
s3.2) carrying out cold spraying at the carrier gas temperature of 500-800 ℃ and the carrier gas pressure of 3-5MPa; and (3) carrying out axial directional deposition on the pre-additive end of the pure copper blank obtained in the S1), wherein the pure copper blank axially rotates around the pure copper blank in the deposition process, the rotating speed is 5-20rpm, the deposition thickness is 5-10mm, and the deposition product is similar to a cylinder.
Further, the specific process of S4) is as follows:
s4.1) annealing the composite electrode blank obtained in the step S3) for 1-4 hours at 200-400 ℃ under the condition of protective atmosphere to obtain an annealed state gradient composite electrode;
s4.2) carrying out cold heading forming on the annealing state gradient composite electrode obtained in the step S4.1), wherein the strain rate is 1-10 -1 。
Cu/alpha-Al 2 O 3 Gradient composite electrode, cu/alpha-Al 2 O 3 The gradient composite electrode is prepared by adopting the preparation method.
Further, the Cu/alpha-Al 2 O 3 End Cu/alpha-Al of gradient composite electrode product 2 O 3 The hardness of the composite material is more than or equal to 130HV 500 Softening temperature is more than or equal to 750 ℃, conductivity IACS (%): more than or equal to 70 percent.
The application develops a process for reinforcing copper alloy by adding nano aluminum oxide particles at the end part of a pure copper rod by adopting a cold spraying technology, which is used for preparing a composite resistance welding electrode blank with low cost, long service life and stability.
With the continuous improvement of welding beats in modern industry, particularly in the automobile industry, and the large-scale use of new materials such as galvanized steel sheets, high-strength steel sheets and the like, higher requirements are put on the comprehensive performance indexes of the resistance welding materials. The novel dispersion strengthening copper alloy composite material is obviously superior to a common resistance welding electrode in comprehensive matching of high-temperature strength and conductivity, and has excellent softening resistance, good conductivity and high wear resistance. When the galvanized steel sheet is welded, the dispersion strengthening phase can also prevent Zn from diffusing to the electrode, effectively inhibit the surface alloying of the electrode and greatly prolong the service life of the electrode.
The method of the application carries out ball milling treatment on copper powder and nano alumina powder to obtain ball milling Cu/alpha-Al 2 O 3 And (5) compounding powder. And then the composite powder is used as a cold spraying raw material to deposit on the surface of pure copper to prepare the composite electrode blank. nano-Al with high volume fraction and dispersed inside material at end of blank 2 O 3 Small particles will cause the zone material to have the high temperature softening resistance, conductivity and higher wear resistance required for the welding electrode. The pure copper at the tail provides excellent electric conductivity and heat conductivity, and the price of the raw material of the whole composite resistance welding electrode is reduced.
The beneficial effects of the application are as follows: by adopting the technical scheme, the resistance welding composite electrode is obtained by the preparation method, the tail part is pure copper, and the end part is composited with cold spraying additive Cu/alpha-Al 2 O 3 And (3) alloy. Inside dispersion distribution of end material high volume fraction nano-Al 2 O 3 Small particles will give the area material excellent performance for the resistance welding electrode. The pure copper at the tail provides excellent electric conductivity and heat conductivity, and reduces the price of the raw materials of the whole composite resistance welding electrode. Meanwhile, the preparation method adopted by the application has the advantages that compared with the internal oxidation method for preparing the dispersion strengthening copper alloy, the nano aluminum oxide generated by the internal oxidation method is in a gamma state, and the gamma-Al is 2 O 3 Will change phase within 850-900 and convert into alpha-Al 2 O 3 . The volume of the converted alumina can shrink by 14.4% -19.4%, which in turn causes the alloy to loosen and reduce the alloy performance.
Drawings
FIG. 1 shows a Cu/alpha-Al composition for electric resistance welding 2 O 3 A flow chart of a preparation method of the gradient composite electrode.
FIG. 2 shows Cu-Al prepared by the method of the present application 2 O 3 And (3) a Cu composite resistance welding electrode product graph.
Detailed Description
The technical scheme of the application is further described below with reference to the accompanying drawings and specific implementation.
The application relates to Cu/alpha-Al for resistance welding 2 O 3 Gradient composite electrodeThe preparation method adopts a cold spraying process to deposit Cu/alpha-Al at the end part of the pure copper blank 2 O 3 Composite powder for realizing axial directional material addition of pure copper blank to obtain nano alpha-Al 2 O 3 The end of the dispersion strengthening copper alloy, namely the composite electrode blank, is subjected to annealing treatment and then is subjected to die forging forming to obtain Cu/alpha-Al 2 O 3 A gradient composite electrode product.
As shown in FIG. 1, the application relates to Cu/alpha-Al for resistance welding 2 O 3 The preparation method of the gradient composite electrode specifically comprises the following steps:
s1) preparing a pure copper blank, and preprocessing the pre-additive end part of the blank;
s2) preparation of nano alumina particles reinforced Cu/alpha-Al 2 O 3 Composite powder;
s3) preparing Cu/alpha-Al from S2) 2 O 3 The composite powder is deposited at the end part of the pure copper blank obtained in the step S1) by adopting a cold spraying process, and the pure copper blank rotates around the axial direction of the composite powder in the deposition process, so that the axial uniform directional material adding of the pure copper blank is realized, and the nano alpha-Al is obtained 2 O 3 A pure copper blank of the dispersion strengthening copper alloy end, namely a composite electrode blank;
s4) carrying out stress relief annealing on the composite electrode blank obtained in the S3) and carrying out cold heading forming to obtain Cu/alpha-Al 2 O 3 Gradient composite electrode as shown in fig. 2.
The following S1): the pure copper blank is a columnar blank;
the pretreatment is as follows: and carrying out cold heading modification on the pre-material-adding end of the pure copper blank to form a pagoda-shaped end for increasing the surface area of the deposition end, and carrying out sand blasting treatment on the surface of the pagoda-shaped end to improve the bonding strength of the composite contact surface.
The pure copper blank is an oxygen-free copper rod.
The specific process in S2) is as follows:
s2.1) mixing copper powder with nano alpha-Al 2 O 3 Mixing the powder to obtain a mixed material;
s2.2) mixing the materials and thenPutting the jade balls together into a ball milling tank, ball milling for 40-50h, and taking out to obtain the nano Cu/alpha-Al for cold spraying 2 O 3 And (5) compounding powder.
Nano alpha-Al in the S2.1) 2 The adding amount of the O3 powder is 0.1-15% of the mass of the composite powder.
The nanometer alpha-Al 2 O 3 The particle size of the particles is 30-100nm.
The specific process of the S3) is as follows:
s3.1) nano Cu/alpha-Al obtained in S2) 2 O 3 Placing the composite powder in cold spraying equipment;
s3.2) carrying out cold spraying at the carrier gas temperature of 500-800 ℃ and the carrier gas pressure of 3-5MPa; and (3) carrying out axial directional deposition on the pre-additive end of the pure copper blank obtained in the S1), wherein the pure copper blank axially rotates around the pure copper blank in the deposition process, the rotating speed is 5-20rpm, the deposition thickness is 5-10mm, and the deposition product is similar to a cylinder.
The specific process of the S4) is as follows:
s4.1) annealing the composite electrode blank obtained in the step S3) for 1-4 hours at the annealing temperature of 200-400 ℃ under the condition of protective atmosphere;
s4.2) carrying out cold heading forming on the annealed gradient composite electrode finished in the step S4.1), wherein the strain rate is 1-10 -1 。
Cu/alpha-Al 2 O 3 Gradient composite electrode, cu/alpha-Al 2 O 3 The gradient composite electrode is prepared by adopting the preparation method.
The Cu/alpha-Al 2 O 3 End Cu/alpha-Al of gradient composite electrode product 2 O 3 The hardness of the composite material is more than or equal to 130HV 500 Softening temperature is more than or equal to 750 ℃, conductivity IACS (%): more than or equal to 70 percent.
Example 1:
4wt.％Al 2 O 3 dispersion strengthening copper
S1) preparation of copper matrix at bottom of composite electrode
Cutting the oxygen-free copper rod into rod-shaped copper particles, shaping one end of the copper particles by adopting a cold forging process, and increasing the surface area of the copper particles so as to improve the surface area of the copper particles and the cold spraying Cu/alpha-Al 2 O 3 Bonding strength of the composite material. The sprayed surface is then sandblasted prior to use.
S2) mixing copper powder with nano alpha-Al 2 O 3 Mixing the powder according to the mass ratio of 10:1, loading the mixture and corundum balls into a ball milling tank, ball milling for 48 hours, and taking out the mixture to obtain Cu/alpha-Al for cold spraying 2 O 3 And (5) compounding powder.
S3) composite electrode tip Cu/alpha-Al 2 O 3 Preparation of composite materials
Cold spraying Cu/alpha-Al with certain thickness onto the end surface of rod copper particle 2 O 3 And (3) the composite material is used for obtaining a revolving body-like composite electrode blank. The spraying carrier gas temperature is 800 ℃ and the carrier gas pressure is 5MPa.
S4) stress relief annealing of composite electrode blanks
And (3) placing the revolving body-like composite electrode blank obtained in the step (3) into an atmosphere protection furnace for stress relief annealing treatment, wherein the heat treatment temperature is 300 ℃, and the annealing time is 2 hours. The soft composite electrode blank obtained by treatment is put into a mould for cold heading forming, and Cu/alpha-Al is obtained 2 O 3 Gradient composite electrode as shown in fig. 2.
In obtaining an electrode using this embodiment, terminal Cu/α -Al 2 O 3 The hardness of the composite material is more than 140HV500, the softening temperature is more than 800 ℃, and the conductivity IACS (%): more than or equal to 75 percent.
Example 2:
2wt.％Al 2 O 3 dispersion strengthening copper
S1) preparation of copper matrix at bottom of composite electrode
Cutting the oxygen-free copper rod into rod-shaped copper particles, shaping one end of the copper particles by adopting a cold forging process, and increasing the surface area of the copper particles so as to improve the surface area of the copper particles and the cold spraying Cu/alpha-Al 2 O 3 Bonding strength of the composite material. The sprayed surface is then sandblasted prior to use.
S2) mixing copper powder with nano alpha-Al 2 O 3 Mixing the powder according to the mass ratio of 20:1, loading the mixture and corundum balls into a ball milling tank, ball milling for 48 hours, and taking out the mixture to obtain Cu/alpha-Al for cold spraying 2 O 3 And (5) compounding powder.
S3) composite electrode tip Cu/alpha-Al 2 O 3 Preparation of composite materials
Cold spraying Cu/alpha-Al with certain thickness onto the end surface of rod copper particle 2 O 3 And (3) the composite material is used for obtaining a revolving body-like composite electrode blank. The spraying carrier gas temperature is 700 ℃ and the carrier gas pressure is 3MPa.
S4) stress relief annealing of composite electrode blanks
And (3) placing the revolving body-like composite electrode blank obtained in the step (3) into an atmosphere protection furnace for stress relief annealing treatment, wherein the heat treatment temperature is 300 ℃, and the annealing time is 1 hour. The soft composite electrode blank obtained by treatment is put into a mould for cold heading forming, and Cu/alpha-Al is obtained 2 O 3 Gradient composite electrode.
In obtaining an electrode using this embodiment, the electrode tip Cu/α -Al 2 O 3 The hardness of the composite material is more than 130HV 500 Softening temperature > 750 ℃, conductivity IACS (%): more than or equal to 85 percent.
Example 3:
8wt.％Al 2 O 3 dispersion strengthening copper
S1) preparation of copper matrix at bottom of composite electrode
Cutting the oxygen-free copper rod into rod-shaped copper particles, shaping one end of the copper particles by adopting a cold forging process, and increasing the surface area of the copper particles so as to improve the surface area of the copper particles and the cold spraying Cu/alpha-Al 2 O 3 Bonding strength of the composite material. The sprayed surface is then sandblasted prior to use.
S2) mixing copper powder with nano alpha-Al 2 O 3 Mixing the powder according to the mass ratio of 7:1, then loading the mixture and corundum balls into a ball milling tank, ball milling for 60 hours, and taking out the mixture to obtain Cu/alpha-Al for cold spraying 2 O 3 And (5) compounding powder.
S3) composite electrode tip Cu/alpha-Al 2 O 3 Preparation of composite materials
Cold spraying Cu/alpha-Al with certain thickness onto the end surface of rod copper particle 2 O 3 And (3) the composite material is used for obtaining a revolving body-like composite electrode blank. The spraying carrier gas temperature is 800 ℃ and the carrier gas pressure is 5MPa.
S4) stress relief annealing of composite electrode blanks
And (3) placing the revolving body-like composite electrode blank obtained in the step (3) into an atmosphere protection furnace for stress relief annealing treatment, wherein the heat treatment temperature is 400 ℃, and the annealing time is 2 hours. The soft composite electrode blank obtained by treatment is put into a mould for cold heading forming, and Cu/alpha-Al is obtained 2 O 3 Gradient composite electrode.
In obtaining an electrode using this embodiment, the electrode tip Cu/α -Al 2 O 3 The hardness of the composite material is more than 150HV 50 0, softening temperature > 830 ℃, conductivity IACS (%): more than or equal to 70 percent.
The Cu/alpha-Al for resistance welding provided by the embodiment of the application 2 O 3 The preparation method of the gradient composite electrode is described in detail. The above description of embodiments is only for aiding in the understanding of the method of the present application and its core ideas; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As referred to throughout the specification and claims, the terms "comprising," including, "and" includes "are intended to be interpreted as" including/comprising, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect. The description hereinafter sets forth a preferred embodiment for practicing the application, but is not intended to limit the scope of the application, as the description is given for the purpose of illustrating the general principles of the application. The scope of the application is defined by the appended claims.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or system comprising such elements.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
While the foregoing description illustrates and describes the preferred embodiments of the present application, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as expressed herein, either as a result of the foregoing teachings or as a result of the knowledge or technology of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the application are intended to be within the scope of the appended claims.

Claims (7)

1. Cu/alpha-Al for resistance welding 2 O 3 Preparation method of gradient composite electrode, which adopts cold spraying technology to deposit Cu/alpha-Al at end of pure copper blank 2 O 3 Composite powder for realizing axial directional material addition of pure copper blank to obtain nano alpha-Al 2 O 3 The pure copper blank of the end of the dispersion strengthening copper alloy, namely the composite electrode blank, is subjected to die forging forming of the annealed electrode blank to obtain Cu/alpha-Al 2 O 3 The gradient composite electrode product is characterized in that the preparation method specifically comprises the following steps:
s1) preparing a pure copper blank, and preprocessing the pre-additive end part of the pure copper blank;
s2) preparation of nano alumina particle reinforced Cu/alpha-Al 2 O 3 Composite powder;
s3) preparing Cu/alpha-Al from S2) 2 O 3 The composite powder is deposited at the end part of the pure copper blank obtained in the step S1) by adopting a cold spraying process, and the pure copper blank rotates around the axial direction of the composite powder in the deposition process, so that the axial uniform directional material adding of the pure copper blank is realized, and the nano alpha-Al is obtained 2 O 3 A pure copper blank of the dispersion strengthening copper alloy end, namely a composite electrode blank;
the specific process comprises the following steps:
s3.1) nano Cu/alpha-Al obtained in S2) 2 O 3 Placing the composite powder in cold spraying equipment;
s3.2) carrying out cold spraying at the carrier gas temperature of 500-800 ℃ and the carrier gas pressure of 3-5MPa; the method comprises the steps of S1) carrying out axial directional deposition on the obtained pure copper blank pre-additive end, wherein the pure copper blank axially rotates around the pure copper blank, the rotating speed is 5-20rpm, the deposition thickness is 5-10mm, and the deposition product is a cylinder-like body, namely a composite electrode blank;
s4) carrying out stress relief annealing on the composite electrode blank obtained in the S3) and carrying out cold heading forming to obtain Cu/alpha-Al 2 O 3 A gradient composite electrode;
the specific process comprises the following steps:
s4.1) under the protection atmosphere condition, the composite electrode blank obtained in the step S3) is annealed at the temperature of 200-400 ℃ for 1-4 hours to obtain an annealed state gradient composite electrode blank;
s4.2) cold heading forming is carried out on the annealed gradient composite electrode blank obtained in the step S4.1), and the strain rate is 1-10 -1 。
2. The method according to claim 1, wherein in S1): the pure copper blank is a columnar blank;
the pretreatment is as follows: and (3) performing cold heading modification on the pre-material-adding end of the pure copper blank to obtain a pagoda-shaped end, and performing sand blasting on the surface of the pagoda-shaped end.
3. The method of manufacturing according to claim 2, wherein the pure copper billet is an oxygen free copper rod.
4. The preparation method according to claim 1, wherein the specific process in S2) is as follows:
s2.1) mixing copper powder with nano alpha-Al 2 O 3 Mixing the powder to obtain a mixed material;
s2.2) putting the mixed material and the corundum balls into a ball milling tank together, ball milling for 40-50h, and taking out to obtain the nano Cu/alpha-Al for cold spraying 2 O 3 And (5) compounding powder.
5. The method according to claim 4, wherein the nano α -Al in S2.1) 2 O 3 The powder adding amount is 0.1% -15% of the mass of the composite powder; the nanometer alpha-Al 2 O 3 The particle size of the particles is 30-100nm.
6. Cu/alpha-Al 2 O 3 A gradient composite electrode characterized in that the Cu/alpha-Al 2 O 3 The gradient composite electrode is prepared by the preparation method according to any one of claims 1-5.
7. The Cu/α -Al composition according to claim 6 2 O 3 A gradient composite electrode characterized in that the Cu/alpha-Al 2 O 3 End Cu/alpha-Al of gradient composite electrode product 2 O 3 The hardness of the composite material is more than or equal to 130HV 500 Softening temperature is more than or equal to 750 ℃, conductivity IACS (%): more than or equal to 70 percent.
CN202211255511.9A 2022-10-13 2022-10-13 Cu/alpha-Al for resistance welding 2 O 3 Preparation method of gradient composite electrode Active CN115502606B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1775453A (en) * 2005-11-30 2006-05-24 陈铮 Copper alloy electrode for resistance weld and its manufacturing method
CN102676867A (en) * 2012-01-10 2012-09-19 河南科技大学 Alumina particle dispersion strengthened copper composite material and preparation method thereof
CN110331325A (en) * 2019-07-19 2019-10-15 西安理工大学 A kind of nano-alumina reinforcing copper-based composite and preparation method thereof
CN112267041A (en) * 2020-10-26 2021-01-26 有研工程技术研究院有限公司 Composite bar and preparation method and application thereof
CN113441730A (en) * 2021-06-30 2021-09-28 中国兵器科学研究院宁波分院 Additive manufacturing method of large dispersion-strengthened copper component
CN113718242A (en) * 2021-06-30 2021-11-30 中国兵器科学研究院宁波分院 Additive manufacturing, connecting and forming method of large-size dispersion-strengthened copper component

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1775453A (en) * 2005-11-30 2006-05-24 陈铮 Copper alloy electrode for resistance weld and its manufacturing method
CN102676867A (en) * 2012-01-10 2012-09-19 河南科技大学 Alumina particle dispersion strengthened copper composite material and preparation method thereof
CN110331325A (en) * 2019-07-19 2019-10-15 西安理工大学 A kind of nano-alumina reinforcing copper-based composite and preparation method thereof
CN112267041A (en) * 2020-10-26 2021-01-26 有研工程技术研究院有限公司 Composite bar and preparation method and application thereof
CN113441730A (en) * 2021-06-30 2021-09-28 中国兵器科学研究院宁波分院 Additive manufacturing method of large dispersion-strengthened copper component
CN113718242A (en) * 2021-06-30 2021-11-30 中国兵器科学研究院宁波分院 Additive manufacturing, connecting and forming method of large-size dispersion-strengthened copper component

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