CN110747364B - High-strength, high-conductivity and heat-resistant copper-chromium alloy and preparation method thereof - Google Patents
High-strength, high-conductivity and heat-resistant copper-chromium alloy and preparation method thereof Download PDFInfo
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- 229910000599 Cr alloy Inorganic materials 0.000 title claims abstract description 40
- GXDVEXJTVGRLNW-UHFFFAOYSA-N [Cr].[Cu] Chemical compound [Cr].[Cu] GXDVEXJTVGRLNW-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000000788 chromium alloy Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000956 alloy Substances 0.000 claims abstract description 87
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 84
- 239000010949 copper Substances 0.000 claims abstract description 43
- 229910052802 copper Inorganic materials 0.000 claims abstract description 32
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 28
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims abstract description 24
- ZIKATJAYWZUJPY-UHFFFAOYSA-N thulium (III) oxide Inorganic materials [O-2].[O-2].[O-2].[Tm+3].[Tm+3] ZIKATJAYWZUJPY-UHFFFAOYSA-N 0.000 claims abstract description 23
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 17
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims description 59
- 239000000843 powder Substances 0.000 claims description 54
- 239000007800 oxidant agent Substances 0.000 claims description 18
- 230000032683 aging Effects 0.000 claims description 16
- 229910017767 Cu—Al Inorganic materials 0.000 claims description 15
- 230000001590 oxidative effect Effects 0.000 claims description 15
- 239000012298 atmosphere Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 14
- 229910017813 Cu—Cr Inorganic materials 0.000 claims description 10
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910000881 Cu alloy Inorganic materials 0.000 abstract description 32
- 239000000463 material Substances 0.000 abstract description 7
- 238000009749 continuous casting Methods 0.000 abstract description 6
- 229910000510 noble metal Inorganic materials 0.000 abstract description 5
- 238000013329 compounding Methods 0.000 abstract description 4
- 238000003723 Smelting Methods 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 239000011651 chromium Substances 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 241000784732 Lycaena phlaeas Species 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 9
- 229910052709 silver Inorganic materials 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 229910052737 gold Inorganic materials 0.000 description 5
- 239000010931 gold Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- BERDEBHAJNAUOM-UHFFFAOYSA-N copper(I) oxide Inorganic materials [Cu]O[Cu] BERDEBHAJNAUOM-UHFFFAOYSA-N 0.000 description 3
- KRFJLUBVMFXRPN-UHFFFAOYSA-N cuprous oxide Chemical group [O-2].[Cu+].[Cu+] KRFJLUBVMFXRPN-UHFFFAOYSA-N 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 238000002490 spark plasma sintering Methods 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910001093 Zr alloy Inorganic materials 0.000 description 1
- 238000003483 aging Methods 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
- C22C1/1047—Alloys containing non-metals starting from a melt by mixing and casting liquid metal matrix composites
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Composite Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
The embodiment of the invention provides a high-strength high-conductivity heat-resistant copper-chromium alloy and a preparation method thereof, wherein the high-strength high-conductivity heat-resistant copper-chromium alloy contains Y2O3、Al2O3、Cr、Tm2O3、La2O3And copper in which Y passes through2O3、Tm2O3、La2O3The copper alloy with high strength, high conductivity and heat resistance, which does not need to add noble metal, is obtained by the synergistic effect generated by compounding and the reasonable collocation of the contents of all the elements, the material cost is reduced, the tensile strength of the copper alloy is more than 700MPa at room temperature, the conductivity of the copper alloy is higher than 85 percent IACS, compared with the similar alloy, the temperature required by smelting in all the steps is lower, the energy consumption is further saved, and when the copper alloy is used for a continuous casting crystallizer copper pipe, the service life of the copper alloy is 2.5 times longer than that of a common copper pipe.
Description
Technical Field
The invention belongs to the technical field of alloy preparation, and particularly relates to a high-strength, high-conductivity and heat-resistant copper-chromium alloy and a preparation method thereof.
Background
The high-strength, high-conductivity and heat-resistant copper alloy has excellent comprehensive physical and mechanical properties, and is widely applied to large-scale integrated circuit lead frames, electric engineering switch contact bridges, continuous casting machine crystallizer linings, high-pulse magnetic field conductors, high-power asynchronous traction motor rotors, electrified railway contact wires and the like.
CN107794402A discloses a high-strength high-conductivity copper alloy wire, which contains Ag, Au, and the balance copper, and the method for preparing the high-strength high-conductivity copper alloy wire comprises: the method comprises the steps of preparing a copper alloy, putting copper, silver and gold into a vacuum smelting furnace, melting and preserving heat of the three metals in a vacuum environment, then carrying out vacuum cooling, then preparing a copper alloy rod, putting the prepared alloy into a vacuum continuous casting furnace for vacuum continuous casting, continuously casting the alloy into the copper alloy rod, then drawing wires, and carrying out unidirectional wire drawing on the prepared copper alloy rod. CN105936983B discloses a high-strength high-conductivity copper alloy material, which is composed of Cr, Be, Ni, Si, Zn, Ag and Cu, wherein the copper alloy material is prepared by selecting and adding alloy elements with small influence on the conductivity of the copper alloy when in low content in the composition design, comprehensively considering factors such as solid solution strengthening and age hardening of the copper alloy on the premise of ensuring the conductivity of a copper alloy matrix, thereby being beneficial to refining alloy phase grains, greatly improving the mechanical property of the copper alloy under the condition of not reducing the conductivity of the copper alloy material, effectively solving the problem of contradiction between the strength and the conductivity of the high-strength high-conductivity copper alloy matrix, and meanwhile, having excellent high-temperature resistance and good thermal stability. CN106978546B discloses a composite reinforced high-strength high-conductivity copper alloy and a preparation method thereof, wherein the alloy comprises the following components: cr, at least one element selected from Ag and In, at least one element selected from La, Ce and Y, and the balance of Cu and unavoidable impurity elements. The composite reinforced high-strength high-conductivity copper alloy can obtain a copper alloy frame strip or an alloy wire with high strength, high conductivity and high softening temperature resistance by optimizing the components of the composite reinforced high-strength high-conductivity copper alloy, can meet the use requirements of a frame material for an integrated circuit, a contact wire, an alloy wire and other high-strength high-conductivity wires, and is high in cost due to the fact that Ag is inevitably added into the alloy. CN106591610B discloses a method for preparing a high-strength and high-conductivity copper alloy by spark plasma sintering, wherein gas atomized Cu-Ag-Zr alloy powder is used as a raw material, and a finished product with uniform components and tissues, fine crystal grains, high strength and excellent electric and heat conductivity is obtained by spark plasma sintering. Meanwhile, the process designed by the invention is simple, the preparation period is short, and the quality of the obtained finished product is excellent.
In conclusion, noble metals such as Ag and Au are inevitably added to the existing high-strength, high-conductivity and heat-resistant copper alloy, so that the material cost is increased, and the wide application of the high-strength, high-conductivity and heat-resistant copper alloy is limited. Therefore, there is still a need to develop a copper alloy having high strength, high conductivity and heat resistance by a new method.
Disclosure of Invention
In order to solve the problem that in the prior art, precious metals such as Ag, Au and the like are inevitably added into the high-strength high-conductivity heat-resistant copper alloy, so that the material cost is too high, the invention aims to provide the high-strength high-conductivity heat-resistant copper-chromium alloy.
The second object of the present invention is to provide a method for preparing the above-mentioned high-strength, high-conductivity and heat-resistant copper-chromium alloy.
A high-strength, high-conductivity and heat-resistant copper-chromium alloy comprises the following components in percentage by mass:
Y2O30.5～1.0％，
Al2O30.1～0.3％，
Cr0.1～0.3％，
Tm2O3 0.1～0.5％，
La2O3 0.1～0.5％，
the balance being copper.
In the above copper-chromium alloy, the passing Y2O3、Tm2O3、La2O3The synergistic effect generated by compounding and the reasonable collocation of the contents of all the elements obtain the high-strength, high-conductivity and heat-resistant copper alloy without adding noble metals, and the material cost is reduced.
The preparation method of the high-strength, high-conductivity and heat-resistant copper-chromium alloy comprises the following steps:
s1: uniformly mixing Cu-Al alloy powder with an oxidant, and carrying out first heat treatment in an oxygen atmosphere to obtain first alloy powder;
s2: carrying out second heat treatment on the first alloy powder in a hydrogen atmosphere to obtain second alloy powder;
s3: mixing the second alloy powder, Y2O3、Tm2O3And La2O3Adding the alloy into the melted Cu-Cr alloy, and cooling to obtain an alloy billet;
s4: and heating the alloy billet, performing water seal extrusion and aging treatment to obtain the high-strength, high-conductivity and heat-resistant copper-chromium alloy.
Preferably, the mass ratio of the Cu-Al alloy powder to the oxidant is (20-30): 1.
further preferably, the mass ratio of the Cu — Al alloy powder to the oxidizing agent is 25: 1.
preferably, the temperature of the first heat treatment is 650-750 ℃.
Further preferably, the temperature of the first heat treatment is 700 ℃.
Preferably, the time of the first heat treatment is 4-6 h.
Further preferably, the time of the first heat treatment is 5 hours.
Preferably, the temperature of the second heat treatment is 750-800 ℃.
Preferably, the time of the second heat treatment is 2-4 h.
Preferably, the heating temperature in the step S4 is 700-800 ℃.
Preferably, the temperature of the aging treatment is 300-350 ℃.
Preferably, the time of the aging treatment is 1-2 h.
In step S1, the Cu — Al alloy powder may be commercially available, or may be obtained by melting Cu and Al and then atomizing them. The oxidant is Cu2O, the oxidizing agent can be obtained from the market or prepared by itself. The self-preparation method comprises the following steps:
sieving powder with the particle size of 200 meshes from Cu-Al alloy powder, heating the powder to 200-300 ℃ in air to uniformly oxidize the surface of the powder to form CuO, then placing the powder in a closed container, and heating for 1.5 hours at 850 ℃ in a nitrogen atmosphere to obtain the oxidant. One of the purposes of the high temperature heating at 850 ℃ is to completely oxidize Al into Al2O3The second purpose is to decompose CuO into Cu with larger decomposition pressure2And O. The component of the oxidant is mainly Cu2O，Cu2The mass percentage content of O is 99.1-99.98%, and only a small amount of Cu and Al are remained2O3。
The invention has the advantages of
1. According to the high-strength high-conductivity heat-resistant copper-chromium alloy disclosed by the embodiment of the invention, the high-strength high-conductivity heat-resistant copper alloy without adding noble metals such as silver, gold and the like is obtained by compounding rare earth oxides, so that the material cost is reduced;
2. the high-strength, high-conductivity and heat-resistant copper-chromium alloy disclosed by the embodiment of the invention has the tensile strength of more than 700MPa at room temperature, the conductivity of more than 85% IACS and good heat resistance;
3. compared with the similar alloy, the preparation method of the high-strength, high-conductivity and heat-resistant copper-chromium alloy provided by the embodiment of the invention has the advantages that the temperature required by smelting in each step is lower, and the energy consumption is further saved.
Detailed Description
The high-strength, high-conductivity and heat-resistant copper-chromium alloy of the embodiment of the invention contains rare earth oxide Y2O3、Tm2O3、La2O3Through the synergistic effect generated by compounding and the reasonable collocation of the contents of all elements, the high-strength, high-conductivity and heat-resistant copper alloy without adding noble metal is obtained, and the material cost is reduced.
The following are specific examples of the present invention, and the technical solutions of the present invention will be further described with reference to the examples, but the present invention is not limited to the examples.
Example 1
The embodiment provides a high-strength, high-conductivity and heat-resistant copper-chromium alloy which comprises the following components in percentage by mass:
Y2O30.5％，
Al2O30.1％，
Cr0.1％，
Tm2O3 0.1％，
La2O3 0.1％，
the balance being copper.
Example 2
The embodiment provides a high-strength, high-conductivity and heat-resistant copper-chromium alloy which comprises the following components in percentage by mass:
Y2O31.0％，
Al2O30.3％，
Cr0.3％，
Tm2O3 0.5％，
La2O3 0.5％，
the balance being copper.
Example 3
The embodiment provides a high-strength, high-conductivity and heat-resistant copper-chromium alloy which comprises the following components in percentage by mass:
Y2O30.75％，
Al2O30.2％，
Cr0.2％，
Tm2O3 0.3％，
La2O3 0.3％，
the balance being copper.
Example 4
This example provides the oxidizing agent Cu2The preparation method of O comprises the following steps:
sieving powder with the particle size of 200 meshes from Cu-Al alloy powder, heating the powder to 200-300 ℃ in air to uniformly oxidize the surface of the powder to form CuO, then placing the powder in a closed container, and heating for 1.5 hours at 850 ℃ in a nitrogen atmosphere to obtain the oxidant. One of the purposes of the high temperature heating at 850 ℃ is to completely oxidize Al into Al2O3The second purpose is to decompose CuO into Cu with larger decomposition pressure2And O. The component of the oxidant is mainly Cu2O，Cu2The mass percentage content of O is 99.1-99.98%, and only a small amount of Cu and Al are remained2O3。
Example 5
The embodiment provides a preparation method of a high-strength, high-conductivity and heat-resistant copper-chromium alloy, which comprises the following steps:
s1: uniformly mixing Cu-Al alloy powder with an oxidant, and carrying out first heat treatment in an oxygen atmosphere to obtain first alloy powder;
s2: carrying out second heat treatment on the first alloy powder in a hydrogen atmosphere to obtain second alloy powder;
s3: mixing the second alloy powder, Y2O3、Tm2O3And La2O3Adding the alloy into the melted Cu-Cr alloy, and cooling to obtain an alloy billet;
s4: and heating the alloy billet, performing water seal extrusion and aging treatment to obtain the high-strength, high-conductivity and heat-resistant copper-chromium alloy.
Wherein the mass ratio of the Cu-Al alloy powder to the oxidant is (20-30): 1, preferably 25: 1.
the temperature of the first heat treatment is 650-750 ℃, and preferably 700 ℃.
The time of the first heat treatment is 4-6 h, preferably 5 h.
The temperature of the second heat treatment is 750-800 ℃, preferably 770 ℃.
The time of the second heat treatment is 2-4 hours, and preferably 3 hours.
The heating temperature of the step S4 is 700-800 ℃, and preferably 750 ℃.
The temperature of the aging treatment is 300-350 ℃, and the optimal temperature is 330 ℃.
The time of the aging treatment is 1-2, preferably 1.5 h.
Comparative example 1
The embodiment provides a copper-chromium alloy which comprises the following components in percentage by mass:
Y2O30.75％，
Al2O30.2％，
Cr0.2％，
La2O3 0.3％，
the balance being copper.
Comparative example 2
The embodiment provides a copper-chromium alloy which comprises the following components in percentage by mass:
Y2O30.75％，
Al2O30.2％，
Cr0.2％，
Tm2O3 0.3％，
the balance being copper.
Comparative example 3
The embodiment provides a high-strength, high-conductivity and heat-resistant copper-chromium alloy which comprises the following components in percentage by mass:
Al2O30.2％，
Cr0.2％，
Tm2O3 0.3％，
La2O3 0.3％，
the balance being copper.
Comparative example 4
The embodiment provides a high-strength, high-conductivity and heat-resistant copper-chromium alloy which comprises the following components in percentage by mass:
Y2O30.3％，
Al2O30.2％，
Cr0.2％，
Tm2O3 0.3％，
La2O3 0.3％，
the balance being copper.
Comparative example 5
The embodiment provides a high-strength, high-conductivity and heat-resistant copper-chromium alloy which comprises the following components in percentage by mass:
Y2O30.75％，
Al2O30.2％，
Cr0.2％，
Tm2O3 0.05％，
La2O3 0.3％，
the balance being copper.
Comparative example 6
The embodiment provides a high-strength, high-conductivity and heat-resistant copper-chromium alloy which comprises the following components in percentage by mass:
Y2O30.75％，
Al2O30.2％，
Cr0.2％，
Tm2O3 0.3％，
La2O3 0.05％，
the balance being copper.
Test example 1
This example actually prepares a high strength, high conductivity and heat resistant Cu-Cr alloy containing Y2O30.75％，Al2O30.2％，Cr0.2％，Tm2O3 0.3％，La2O30.3 percent of copper and the balance of copper.
The preparation method comprises the following specific steps:
s1: mixing Cu-Al alloy powder with Cu2After O is uniformly mixed, carrying out first heat treatment in an oxygen atmosphere to obtain first alloy powder;
s2: carrying out second heat treatment on the first alloy powder in a hydrogen atmosphere to obtain second alloy powder;
s3: mixing the second alloy powder, Y2O3、Tm2O3And La2O3Adding the alloy into the melted Cu-Cr alloy, and cooling to obtain an alloy billet;
s4: and heating the alloy billet, performing water seal extrusion and aging treatment to obtain the high-strength, high-conductivity and heat-resistant copper-chromium alloy.
Wherein the mass ratio of the Cu-Al alloy powder to the oxidant is 25: 1.
the temperature of the first heat treatment was 700 ℃.
The time for the first heat treatment was 5 hours.
The temperature of the second heat treatment was 770 ℃.
The time of the second heat treatment was 3 hours.
The temperature of heating in step S4 was 750 ℃.
The temperature of the aging treatment was 330 ℃.
Test example 2
This example actually prepares a high strength, high conductivity and heat resistant Cu-Cr alloy containing Y2O30.75％，Al2O30.2％，Cr0.2％，La2O30.3 percent of copper and the balance of copper.
The preparation method comprises the following specific steps:
s1: mixing Cu-Al alloy powder with Cu2After O is uniformly mixed, carrying out first heat treatment in an oxygen atmosphere to obtain first alloy powder;
s2: carrying out second heat treatment on the first alloy powder in a hydrogen atmosphere to obtain second alloy powder;
s3: mixing the second alloy powder, Y2O3、Tm2O3And La2O3Adding the alloy into the melted Cu-Cr alloy, and cooling to obtain an alloy billet;
s4: and heating the alloy billet, performing water seal extrusion and aging treatment to obtain the high-strength, high-conductivity and heat-resistant copper-chromium alloy.
Wherein the mass ratio of the Cu-Al alloy powder to the oxidant is 25: 1.
the temperature of the first heat treatment was 700 ℃.
The time for the first heat treatment was 5 hours.
The temperature of the second heat treatment was 770 ℃.
The time of the second heat treatment was 3 hours.
The temperature of heating in step S4 was 750 ℃.
The temperature of the aging treatment was 330 ℃.
Test example 3
This example actually prepares a high strength, high conductivity and heat resistant Cu-Cr alloy containing Y2O30.75％，Al2O30.2％，Cr0.2％，Tm2O3 0.3％，La2O30.05% and the balance copper.
The preparation method comprises the following specific steps:
s1: mixing Cu-Al alloy powder with Cu2After O is uniformly mixed, carrying out first heat treatment in an oxygen atmosphere to obtain first alloy powder;
s2: carrying out second heat treatment on the first alloy powder in a hydrogen atmosphere to obtain second alloy powder;
s3: mixing the second alloy powder, Y2O3、Tm2O3And La2O3Adding the alloy into the melted Cu-Cr alloy, and cooling to obtain an alloy billet;
s4: and heating the alloy billet, performing water seal extrusion and aging treatment to obtain the high-strength, high-conductivity and heat-resistant copper-chromium alloy.
Wherein the mass ratio of the Cu-Al alloy powder to the oxidant is 25: 1.
the temperature of the first heat treatment was 700 ℃.
The time for the first heat treatment was 5 hours.
The temperature of the second heat treatment was 770 ℃.
The time of the second heat treatment was 3 hours.
The temperature of heating in step S4 was 750 ℃.
The temperature of the aging treatment was 330 ℃.
Detection example 1
The copper-chromium alloys prepared in test examples 1 to 3 were subjected to performance tests, and the results are shown in table 1.
Table 1 results of performance testing
Detection example 2
The copper-chromium alloy prepared in each of test examples 1 to 3 was processed into three kinds of continuous casting mold copper pipes. The service lives of three kinds of continuous casting crystallizer copper pipes are tested, wherein the service life of the copper pipe prepared by using the copper-chromium alloy of the test example 1 is prolonged by 2.5 times compared with that of a common red copper pipe; compared with the common red copper tube, the copper tube prepared by using the copper-chromium alloy in the test example 2 has the service life prolonged by 1.2 times; compared with the common red copper pipe, the copper pipe prepared by using the copper-chromium alloy in the test example 3 has the service life improved by 0.5 time. The copper-chromium alloy provided by the embodiment of the invention has good heat resistance.
Claims (2)
1. The high-strength high-conductivity heat-resistant copper-chromium alloy is characterized by comprising the following components in percentage by mass:
Y2O30.75 %，
Al2O30.2 %，
Cr0.2 %，
Tm2O3 0.3 %，
La2O3 0.3 %，
the balance being copper;
the preparation method of the high-strength, high-conductivity and heat-resistant copper-chromium alloy comprises the following steps:
s1: uniformly mixing Cu-Al alloy powder with an oxidant, and carrying out first heat treatment in an oxygen atmosphere to obtain first alloy powder;
s2: carrying out second heat treatment on the first alloy powder in a hydrogen atmosphere to obtain second alloy powder;
s3: mixing the second alloy powder, Y2O3、Tm2O3And La2O3Adding the alloy into the melted Cu-Cr alloy, and cooling to obtain an alloy billet;
s4: heating the alloy billet, performing water seal extrusion and aging treatment to obtain the high-strength, high-conductivity and heat-resistant copper-chromium alloy;
wherein the temperature of the first heat treatment is 650-750 ℃, the time of the first heat treatment is 4-6 h, the temperature of the second heat treatment is 750-800 ℃, the time of the second heat treatment is 2-4 h, the heating temperature in the step S4 is 700-800 ℃, the temperature of the aging treatment is 300-350 ℃, and the time of the aging treatment is 1-2 h;
the mass ratio of the Cu-Al alloy powder to the oxidant is (20-30): 1.
2. the method for preparing the high-strength, high-conductivity and heat-resistant copper-chromium alloy according to claim 1, wherein the method comprises the following steps:
s1: uniformly mixing Cu-Al alloy powder with an oxidant, and carrying out first heat treatment in an oxygen atmosphere to obtain first alloy powder;
s2: carrying out second heat treatment on the first alloy powder in a hydrogen atmosphere to obtain second alloy powder;
s3: mixing the second alloy powder, Y2O3、Tm2O3And La2O3Adding the alloy into the melted Cu-Cr alloy, and cooling to obtain an alloy billet;
s4: and heating the alloy billet, performing water seal extrusion and aging treatment to obtain the high-strength, high-conductivity and heat-resistant copper-chromium alloy.
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