CN113843298B - Preparation method of Kovar alloy coated Cu core composite bar - Google Patents
Preparation method of Kovar alloy coated Cu core composite bar Download PDFInfo
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- CN113843298B CN113843298B CN202111128021.8A CN202111128021A CN113843298B CN 113843298 B CN113843298 B CN 113843298B CN 202111128021 A CN202111128021 A CN 202111128021A CN 113843298 B CN113843298 B CN 113843298B
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 106
- 239000000956 alloy Substances 0.000 title claims abstract description 106
- 239000002131 composite material Substances 0.000 title claims abstract description 104
- 229910000833 kovar Inorganic materials 0.000 title claims abstract description 81
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000001125 extrusion Methods 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 238000001192 hot extrusion Methods 0.000 claims abstract description 9
- 238000004080 punching Methods 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 abstract description 11
- 239000010949 copper Substances 0.000 description 80
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000012946 outsourcing Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000010705 motor oil Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention discloses a preparation method of a Kovar alloy coated Cu core composite bar. The process comprises the following steps: s1, preparing an ingot blank: punching a blind hole in a Kovar alloy to obtain a cylinder, processing Cu into a Cu rod with the outer diameter slightly larger than the inner diameter of the Kovar alloy cylinder, and embedding the Cu rod into the Kovar alloy cylinder to obtain a composite ingot blank embedded with the Cu rod; s2, performing heat treatment in advance; s3, hot extrusion: heating the composite ingot blank obtained in the step S2 to 950-980 ℃ along with a furnace, preserving heat for 1.5-2 hours, discharging and extruding the sealed end of the composite ingot blank before the sealing end of the composite ingot blank to obtain a composite rod blank, wherein the temperature of the composite ingot blank is 950-980 ℃ during extrusion, and obtaining the Kovar alloy wrapped Cu core composite bar; s4, final heat treatment. The preparation method has the advantages of simple process, short flow, high efficiency and the like.
Description
Technical Field
The invention relates to a preparation method of a Kovar alloy coated Cu core composite bar with simple working procedures, short flow and high efficiency, belonging to the field of functional composite material preparation.
Background
The Kovar alloy is a metal material with special thermal expansion, namely, the Kovar alloy has a linear expansion coefficient similar to that of hard glass in the range of 20-450 ℃, and can be widely used for a high-vacuum glass-metal airtight sealing part in the field of electronic industry. In recent years, with the rapid development of the electronic industry, sealing alloys for some electric device products have been proposed to have new performance requirements of high strength, high hardness, high elasticity, high electric conductivity, high heat conductivity, no magnetism and the like, but Kovar alloys have poor electric conductivity and heat conductivity. For this reason, corresponding high-conductivity and high-heat-conductivity sealing metals are emerging, wherein Cu has good electric conductivity, heat conductivity and elasticity and has great potential in the sealing material of Kovar alloy.
The traditional Kovar alloy-Cu composite material is usually realized by adopting a welding method, and the physical and chemical properties of the Kovar alloy and Cu are greatly different, so that a common welding method is difficult to adopt, for example, vacuum brazing is extremely easy to generate larger residual stress at a joint, and the mechanical property of the joint is reduced; the hot isostatic pressing diffusion welding has the problems of complex process, difficult requirement on air tightness and electrical property after glass sealing and the like. Thus, there is a need for a process that can efficiently compound Kovar alloy and Cu.
Researchers have used metal injection molding techniques to prepare copper-containing Kovar alloys. The invention creation of the publication No. CN109746455A discloses a copper-containing Kovar alloy and a preparation method thereof, wherein an Fe source, a Ni source, a Co source and a Cu source are mixed and then melted to obtain an alloy liquid flow, the alloy liquid flow is atomized and pulverized to obtain Kovar prefabricated alloy powder, the Kovar prefabricated alloy powder is screened, and finally the screened Kovar prefabricated alloy powder is subjected to dry mixing, feeding and mixing, granulating, injection molding and sintering to obtain the copper-containing Kovar alloy. The Kovar alloy-Cu composite material prepared by the method has high density and large fixed expansion temperature range, but the whole preparation process is longer and the cost is higher.
The invention patent with publication number CN108177320A discloses a fiber reinforced circular tube type material composite extrusion device, which comprises a guide plate, an upper die, a lower die and a fiber traction device, wherein fiber feeding channels are arranged on the guide plate and the upper die, an outlet is parallel to the extrusion direction of the section material, the lower die is provided with a welding chamber, a die hole and a hollow knife which are communicated, and a die core penetrates into the die hole; the composite extrusion device and the extrusion method thereof can continuously strengthen the section bar at a set position on the section bar cross section, realize continuous composite extrusion, are successfully used for preparing the fiber reinforced Al-based composite bar, and can provide reference for the Kovar/Cu composite bar. However, the composite extrusion device has a complex structure, and increases the preparation cost; meanwhile, the assembly is relatively complicated, and the precision requirement is high.
Researchers have used hot extrusion techniques to prepare iron-nickel (Kovar)/Cu composite wires. The invention patent disclosed as CN1555934A discloses a preparation method of an iron-nickel alloy (Kovar alloy)/Cu composite wire, which comprises the following process steps in sequence: and (3) manufacturing an iron-nickel alloy ingot blank coated by the sealing head before and after embedding the copper rod, carrying out high-temperature heat treatment under vacuum, carrying out hot extrusion at 900-950 ℃, and carrying out cold drawing auxiliary heat treatment to obtain the wire. The iron-nickel alloy (Kovar alloy)/Cu expansion alloy composite wire prepared by the method has good electrical conductivity, thermal conductivity and good welding performance, has good matching sealing performance with glass and ceramic at high temperature, improves the air tightness and output power of electronic components, and can be used for leading out connector leads of products such as high-power sealed relays, rectifying tubes, ray tubes, transistors, small-sized high-power motors and the like. However, the method requires that the front end face and the rear end face of the composite blank are processed into inwards concave trapezoids, and the front end face and the rear end face are correspondingly welded with the front end face and the rear end face. The whole preparation process has the problems of complex process, long flow, high cost, strict pretreatment requirements and the like, and an effective solution is not yet available.
Thus, there is a need for an improved Kovar alloy and Cu coextrusion process that solves the above-described problems.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation method of a Kovar alloy coated Cu core composite bar.
The technical scheme of the invention is as follows:
the preparation method of the Kovar alloy coated Cu core composite bar mainly comprises the following steps:
s1, preparing an ingot blank: punching a blind hole in a Kovar alloy to obtain a cylinder, processing Cu into a Cu rod with the outer diameter slightly larger than the inner diameter of the Kovar alloy cylinder, and embedding the Cu rod into the Kovar alloy cylinder to obtain a composite ingot blank embedded with the Cu rod;
s2, pre-heat treatment: carrying out vacuum preheating treatment on the composite ingot blank obtained in the step S1, then slowly cooling to room temperature along with a furnace, and then discharging from the furnace;
s3, hot extrusion: heating the composite ingot blank obtained in the step S2 to 950-980 ℃ along with a furnace, preserving heat for 1.5-2 hours, discharging and extruding the sealed end of the composite ingot blank before the sealed end of the composite ingot blank to obtain a composite rod blank, wherein the temperature of the composite ingot blank is 950-980 ℃ during extrusion, and obtaining a Kovar alloy-coated Cu core composite bar;
s4, final heat treatment: and (3) preserving the temperature of the composite extrusion rod blank obtained in the step (S3) at 350-400 ℃ for 3-4 hours under vacuum, then slowly cooling to room temperature along with a furnace, and discharging to obtain the Kovar alloy wrapped Cu core composite rod.
Preferably, the diameter of the Cu rod in the step S1 is slightly larger than the inner diameter of the Kovar alloy cylinder, and the difference is not more than 0.05mm.
Preferably, the bottom of the Kovar alloy in the step S1 is 0.5-3mm away from the bottom of the Cu rodh）。
Preferably, the inner and outer surfaces of the Kovar alloy cylinder and the Cu rod surface in step S1 are polished and cleaned, for example, with acetone.
Preferably, in the step S1, chamfers are processed on the bottom of the Cu rod and the bottom of the Kovar alloy cylinder.
Preferably, in the step S1, the Kovar alloy cylinder in the composite ingot blank is in interference fit with the Cu rod.
Preferably, the preheating treatment in step S2 is: preserving heat for 3-4 hours at 960-990 ℃.
Preferably, the Kovar/Cu composite ingot is heated and taken out and then is extruded at 950-980 ℃.
Preferably, the vacuum is 1×10 -5 Pa。
Preferably, the extrusion rate is between 9 and 25.
Preferably, the Kovar alloy cylinder outer diameter and Cu rod diameter are 2-2.5:1.
preferably, in the step S3, before extrusion, the extrusion device is preheated, and the temperature of an extrusion die is 400-550 ℃; and cutting off the head and the tail of the rod blank after extrusion.
The beneficial effects of the invention are as follows:
the invention provides a preparation method of a Kovar alloy wrapped Cu core composite bar, wherein the internal material is relatively softer Cu, the external coating material is relatively harder Kovar alloy, compared with the existing extrusion system (such as core fiber reinforced aluminum alloy bar and the like) with a harder core and a softer outer part, the method is more difficult to form (such as the internal material is easy to extrude and the like).
According to the Kovar alloy wrapped Cu core composite bar, a Kovar alloy cylinder and a Cu bar are only needed to be prepared before extrusion forming, and the Kovar alloy wrapped Cu core composite bar can be formed in one step by adopting a hot extrusion process, and can be completed by utilizing a conventional extrusion die, so that the process is simple. Has the advantages of simple blank preparation, short flow, high efficiency and the like. The prepared Kovar/Cu composite bar has good electrical conductivity, thermal conductivity and good welding performance, and good matching sealing property with glass and ceramic at high temperature.
Drawings
FIG. 1 is a schematic diagram of a Kovar alloy cylinder;
FIG. 2 is a schematic illustration of a rod Cu;
FIG. 3 a Kovar alloy/Cu composite ingot after heat treatment;
FIG. 4 Kovar alloy wrapped Cu core composite bar;
FIG. 5 bottom surface of Kovar alloy/Cu composite bar;
FIG. 6 Kovar alloy/Cu composite bar thermal expansion curve.
Detailed Description
Taking a 4J29/Cu phi 10mm product as an example, the invention adopts the process flow and the process parameters:
example 1
(1) Preparing an ingot blank: outsourcing a phi 42mm multiplied by 45mm 4J29 alloy bar, wherein the dimension of a car sheet after blind hole punching is a phi outer 30mm multiplied by 42mm multiplied by 15mm multiplied by 40mm 4J29 alloy cylinder in phi, and the bottom is chamfered (shown in figure 1); outsourcing a Cu bar with the diameter of 16mm multiplied by 40mm, wherein the size of a train wagon is phi 15.2mm multiplied by 40mm, and the bottom is chamfered (shown in figure 2); after the inner surface and the outer surface of the 4J29 alloy cylinder and the surface of the Cu rod are subjected to surface polishing treatment and acetone cleaning and drying, a Cu core is embedded into the 4J29 alloy cylinder by a press machine, and a 4J29 alloy/Cu composite ingot blank (shown in figure 3) with interference fit is prepared.
(2) Pre-heat treatment: the 4J29 alloy/Cu composite ingot blank is placed into a vacuum furnace to be heated along with the furnace, the heating rate is 5 ℃/min, the heat treatment temperature is 990 ℃, the heat preservation time is 3 hours, and then the ingot blank is slowly cooled to room temperature along with the furnace and is discharged from the furnace.
(3) Hot extrusion: heating the composite ingot blank to 980 ℃ along with a furnace, preserving heat for 1.5 hours, rapidly extruding the rod blank by a 20T extruder after discharging from the furnace, adopting a conical die and a concave pad as extrusion dies, using a graphite and engine oil lubricant to lubricate the dies and an extrusion cylinder for extrusion, preheating an extrusion device before extrusion, wherein the temperature of the extrusion dies is 400-550 ℃, when the extrusion is carried out, the sealing end of the composite ingot blank is in front, the extrusion rate is 9, and cutting off the head and the tail of the rod blank after the extrusion is finished to obtain the 4J29 alloy/Cu composite extrusion rod with the size phi of 10 mm.
(4) Final heat treatment: the 4J29 alloy/Cu composite extrusion rod is 1 multiplied by 10 -5 Preserving the heat for 3 hours under Pa vacuum and 400 ℃, then slowly cooling to room temperature along with a furnace, and then discharging from the furnace to obtain the Kovar alloy wrapped Cu core composite bar meeting the requirements (shown in figure 4).
(5) And (3) observing macroscopic morphology: because the composite bar is small in size, for facilitating the observation of macroscopic morphology, the Kovar alloy wrapped Cu core composite bar is firstly subjected to thermal mosaic, namely the thermal mosaic material is coated outside, and then the macroscopic morphology of the Kovar alloy wrapped Cu core composite bar with the diameter ratio of 1:1 can be observed after mechanical grinding and polishing (as shown in figure 5).
(6) And (3) detecting a finished product: the outer diameter size and the copper core size of the 4J29 alloy/Cu composite bar are measured by a micrometer, the surface morphology of the composite extrusion bar is observed by a microscope, and the expansion coefficient is detected by an expander (as shown in figure 6).
Example 2
Taking a 4J29/Cu phi 10mm product as an example, the invention adopts the process flow and the process parameters:
(1) Preparing an ingot blank: the method comprises the steps of outsourcing a phi 42mm multiplied by 45mm 4J29 alloy bar, punching a wagon, wherein the dimension of the wagon is phi outer 40mm multiplied by 42mm multiplied by phi inner 20mm multiplied by 40mm multiplied by 4 mm 4J29 alloy cylinder, chamfering the bottom, outsourcing a phi 21mm multiplied by 40mm Cu bar, and chamfering the bottom, wherein the dimension of the wagon is phi 20.2mm multiplied by 40 mm; after the inner and outer surfaces of the 4J29 alloy cylinder and the surface of the Cu rod are subjected to surface polishing treatment and acetone cleaning and drying, a Cu core is embedded into the 4J29 alloy cylinder by a press machine, and a 4J29 alloy/Cu composite ingot blank with interference fit relationship is prepared (shown in figure 3).
(2) Pre-heat treatment: the 4J29 alloy/Cu composite ingot blank is placed into a vacuum furnace to be heated along with the furnace, the heating rate is 5 ℃/min, the heat treatment temperature is 990 ℃, the heat preservation time is 3 hours, and then the ingot blank is slowly cooled to room temperature along with the furnace and is discharged from the furnace.
(3) Hot extrusion: heating the composite ingot blank to 980 ℃ along with a furnace, and preserving heat for 1.5 hours; extruding a bar blank by a 20T extruder after discharging, adopting a conical die and a concave pad as extrusion dies, using a graphite and engine oil lubricant to lubricate the dies and an extrusion cylinder for extrusion, preheating an extrusion device before extrusion, wherein the temperature of the extrusion dies is 400-550 ℃, when the extrusion is carried out, the sealing end of the composite bar blank is in front, the extrusion temperature is 980 ℃, the heat preservation time is 1.5 hours, the extrusion rate is 16, and after the extrusion is finished, cutting off the head and the tail of the bar blank, thus obtaining the 4J29 alloy/Cu composite extrusion bar with the size phi of 10 mm.
(4) Final heat treatment: the 4J29 alloy/Cu composite extrusion rod is 1 multiplied by 10 -5 Preserving heat for 3 hours under Pa vacuum and 400 ℃,then gradually cooling to room temperature along with furnace, and discharging from the furnace to obtain the Kovar alloy wrapped Cu core composite bar which meets the requirements (as shown in figure 4).
(5) And (3) observing macroscopic morphology: because the composite bar is small in size, for facilitating the observation of macroscopic morphology, the Kovar alloy wrapped Cu core composite bar is firstly subjected to thermal mosaic, namely the thermal mosaic material is coated outside, and then the macroscopic morphology of the Kovar alloy wrapped Cu core composite bar with the diameter ratio of 1:1 can be observed after mechanical grinding and polishing (as shown in figure 5). And (6) detecting a finished product: and measuring the outer diameter size and the copper core size of the 4J29 alloy/Cu composite bar by adopting a micrometer, observing the surface morphology of the composite extrusion bar by adopting a microscope, and detecting the expansion coefficient by using an expander.
Example 3
Taking a 4J29/Cu phi 10mm product as an example, the invention adopts the process flow and the process parameters:
(1) Preparing an ingot blank: the method comprises the steps of outsourcing a phi 52mm multiplied by 45mm 4J29 alloy bar, punching a wagon, wherein the dimension of the wagon is phi 50mm multiplied by 42mm multiplied by phi and 20mm multiplied by 40mm multiplied by 4J29 alloy cylinder in phi, chamfering the bottom, outsourcing a phi 21mm multiplied by 40mm Cu bar, and chamfering the bottom, wherein the dimension of the wagon is phi 20.2mm multiplied by 40 mm; after the inner and outer surfaces of the 4J29 alloy cylinder and the surface of the Cu rod are subjected to surface polishing treatment and acetone cleaning and drying, a Cu core is embedded into the 4J29 alloy cylinder by a press machine, and a 4J29 alloy/Cu composite ingot blank with interference fit is prepared (shown in figure 3).
(2) Pre-heat treatment: the 4J29 alloy/Cu composite ingot blank is placed into a vacuum furnace to be heated along with the furnace, the heating rate is 5 ℃/min, the heat treatment temperature is 960 ℃, the heat preservation time is 4 hours, and then the ingot blank is slowly cooled to room temperature along with the furnace and is discharged from the furnace.
(3) Hot extrusion: heating the composite ingot blank to 950 ℃ along with a furnace, and preserving heat for 2 hours; and (3) rapidly extruding a bar blank by using a 20T extruder after discharging, adopting a conical die and a concave pad as extrusion dies, extruding by using a graphite and engine oil lubricant lubrication die and an extrusion cylinder, preheating an extrusion device before extrusion, wherein the temperature of the extrusion die is 400-550 ℃, when in extrusion, the sealing end of the composite ingot blank is in front, the extrusion rate is 25, and cutting off the head and the tail of the bar blank after extrusion is finished to obtain the 4J29 alloy/Cu composite extrusion bar with the size phi 10 mm.
(4) Final heat treatment: the 4J29 alloy/Cu composite extrusion rod is 1 multiplied by 10 -5 Preserving the heat for 4 hours under Pa vacuum and 350 ℃, then slowly cooling to room temperature along with a furnace, and then discharging from the furnace to obtain the Kovar alloy wrapped Cu core composite bar meeting the requirements (shown in figure 4).
(5) And (3) observing macroscopic morphology: because the composite bar is small in size, for facilitating the observation of macroscopic morphology, the Kovar alloy wrapped Cu core composite bar is firstly subjected to thermal mosaic, namely the thermal mosaic material is coated outside, and then the macroscopic morphology of the Kovar alloy wrapped Cu core composite bar with the diameter ratio of 1:1 can be observed after mechanical grinding and polishing (as shown in figure 5).
(6) And (3) detecting a finished product: measuring the outer diameter size and the copper core size of the 4J29 alloy/Cu composite bar by adopting a micrometer, observing the surface morphology of the composite extrusion bar by adopting a microscope, and detecting the expansion coefficient by using an expander
The performance parameters of the obtained 4J29 alloy/Cu composite bar finished product are as follows:
outer diameter dimension: 9.98-10.02mm
Copper core size: 4.98-5.02mm
Coefficient of expansion: alpha 30~600℃= 11.7ⅹ10 -6 /K。
Claims (9)
1. The preparation method of the Kovar alloy coated Cu core composite bar is characterized by comprising the following steps of: the method comprises the following steps:
s1, preparing an ingot blank: punching a blind hole in a Kovar alloy to obtain a cylinder, processing Cu into a Cu rod with the outer diameter slightly larger than the inner diameter of the Kovar alloy cylinder, wherein the difference is not more than 0.05mm, and embedding the Cu rod into the Kovar alloy cylinder to obtain a composite ingot blank embedded with the Cu rod;
s2, pre-heat treatment: carrying out vacuum preheating treatment on the composite ingot blank obtained in the step S1, then slowly cooling to room temperature along with a furnace, and then discharging from the furnace;
s3, hot extrusion: heating the composite ingot blank obtained in the step S2 to 950-980 ℃ along with a furnace, preserving heat for 1.5-2 hours, discharging and extruding the sealed end of the composite ingot blank before the sealed end of the composite ingot blank to obtain a composite rod blank, wherein the temperature of the composite ingot blank is 950-980 ℃ during extrusion, and obtaining a Kovar alloy-coated Cu core composite bar;
s4, final heat treatment: and (3) preserving the temperature of the composite extrusion rod blank obtained in the step (S3) at 350-400 ℃ for 3-4 hours under vacuum, then slowly cooling to room temperature along with a furnace, and discharging to obtain the Kovar alloy wrapped Cu core composite rod.
2. The method for preparing the Kovar alloy coated Cu-core composite bar according to claim 1, which is characterized in that: the bottom of the Kovar alloy in the step S1 is 0.5-3mm away from the bottom of the Cu rod.
3. The method for preparing the Kovar alloy coated Cu-core composite bar according to claim 1, which is characterized in that: in the step S1, polishing the inner surface and the outer surface of the Kovar alloy cylinder and the surface of the Cu rod, and cleaning;
in the step S1, chamfering is processed on the bottom of the Cu rod and the bottom of the Kovar alloy cylinder.
4. The method for preparing the Kovar alloy coated Cu-core composite bar according to claim 1, which is characterized in that: in the step S1, the Kovar alloy cylinder in the composite ingot blank is in interference fit with the Cu rod.
5. The method for preparing the Kovar alloy coated Cu-core composite bar according to claim 1, which is characterized in that: the preheating process in step S2 is: preserving heat for 3-4 hours at 960-990 ℃.
6. The method for preparing the Kovar alloy coated Cu-core composite bar according to claim 1, which is characterized in that: and heating and taking out the Kovar/Cu composite ingot blank, and rapidly extruding at 950-980 ℃.
7. The method for preparing the Kovar alloy coated Cu-core composite bar according to claim 1, which is characterized in that: the extrusion rate is 9-25.
8. The method for preparing the Kovar alloy coated Cu-core composite bar according to claim 1, which is characterized in that: the outer diameter of the Kovar alloy cylinder and the diameter of the Cu rod are 2-2.5:1.
9. the method for preparing the Kovar alloy coated Cu-core composite bar according to claim 1, which is characterized in that: in the step S3, before extrusion, the extrusion device is preheated, and the temperature of an extrusion die is 400-550 ℃; and cutting off the head and the tail of the rod blank after extrusion.
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| CN112191704A (en) * | 2020-08-10 | 2021-01-08 | 法尔胜泓昇集团有限公司 | Continuous mixing manufacturing method from blank to bimetal composite wire |
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| CN102398008A (en) * | 2011-11-28 | 2012-04-04 | 苏州有色金属研究院有限公司 | Method for preparing aluminum alloy composite round ingot blank |
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| CN111659749A (en) * | 2020-05-20 | 2020-09-15 | 西部超导材料科技股份有限公司 | Preparation method of NbTi/CuNi/Cu superconducting composite wire |
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