CN114959383B - Al-based ternary heat-resistant motor rotor alloy and preparation method and application thereof - Google Patents
Al-based ternary heat-resistant motor rotor alloy and preparation method and application thereof Download PDFInfo
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Abstract
The application discloses an Al-based ternary heat-resistant motor rotor alloy, which belongs to the technical field of new energy automobile motors, and comprises 0.6-1.0wt% of Fe, 1.2-1.5wt% of Zn and the balance of Al; or Cu 0.4-1.2wt%, zn0.5-2.0wt% and Al for the rest; or Cu 0.4-1.2wt%, si 0.2-0.4wt% and Al for the rest; or comprises 0.5-2.0wt% of Zn, 0.2-0.8wt% of Si and the balance of Al. The application provides four elements added in the cast aluminum alloy and the addition proportion of each element, and the types and the proportion of the elements can ensure that the aluminum alloy has good heat resistance, good high-temperature creep resistance and low production cost under the condition of ensuring good conductivity and tensile strength, and is suitable for industrialized popularization.
Description
Technical Field
The application relates to an Al-based ternary heat-resistant motor rotor alloy and a preparation method and application thereof, and belongs to the technical field of new energy automobile motors.
Background
Because aluminum has the advantages of low density, good electric conduction and heat conduction properties and low price, the aluminum is gradually selected to be applied to manufacturing the motor rotor of the new energy automobile to replace copper materials so as to achieve the aims of cost reduction and light weight. In order to obtain higher efficiency, the cast aluminum rotor aluminum material is required to have higher conductivity; in order to achieve higher rotational speeds, cast aluminum rotor aluminum materials are required to have higher strength.
At present, the cast aluminum rotor for the new energy automobile mainly uses high-purity aluminum, the casting process mainly comprises high-pressure casting, centrifugal casting and the like, and under the general condition, the conductivity or mechanical property of the cast aluminum alloy can be improved by adding other metal elements within a certain range, but the added metal elements in the prior art have the advantages of higher cost, poorer performance improvement and low cost performance, and on the other hand, the balance of the conductivity, the mechanical property and other properties is difficult to achieve after the metal elements are added, so that the conditions of high conductivity, poorer mechanical property, poor heat resistance or low conductivity and other good properties frequently occur, and various properties are difficult to be in a good range.
Disclosure of Invention
In order to solve the problems, the Al-based ternary heat-resistant motor rotor alloy, the preparation method and the application thereof are provided, and four elements added by casting aluminum alloy and the addition proportion of each element are provided.
According to one aspect of the present application, there is provided an Al-based ternary heat resistant motor rotor alloy comprising 0.6-1.0wt% Fe, 1.2-1.5wt% Zn, the balance being Al; or Cu 0.4-1.2wt%, zn0.5-2.0wt% and Al for the rest; or Cu 0.4-1.2wt%, si 0.2-0.4wt% and Al for the rest; or comprises Zn0.5-2.0wt%, si 0.2-0.8wt% and the rest is Al.
Preferably, the Al is high purity Al with a purity of greater than 99.8%.
Optionally, in the Al-Fe-Zn alloy, the content ratio of Fe to Zn is (0.5-0.8): 1.
optionally, the content ratio of Cu to Zn in the Al-Cu-Zn alloy is (0.3-2.0): 1.
alternatively, the content ratio of Cu to Si in the Al-Cu-Si alloy is (1.3-3.0): 1.
alternatively, the content ratio of Zn to Si in the Al-Zn-Si alloy is (1.0-3.0): 1.
according to another aspect of the present application, there is also provided a method for preparing the above Al-based ternary heat-resistant motor rotor alloy, comprising the steps of:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Fe and Zn components or weighed Cu and Si components or weighed Zn and Si components, and stirring uniformly after the aluminum ingot is completely melted;
(2) Refining at 720-740 deg.c, skimming slag and setting;
(3) And preheating the casting mould, performing centrifugal casting, stopping rotation of casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the Al-based ternary heat-resistant motor rotor alloy.
Optionally, the heating temperature in step (1) is 710-750 ℃; the preheating temperature in the step (3) is 720-740 ℃, the centrifugal speed is 200-300r/min, and the casting temperature is 715-730 ℃.
Optionally, the refining method in the step (2) is to jet gas in a rotating way or add a refining agent accounting for 0.5-1% of the total mass of the melt, and the refining time is 10-30min.
Optionally, the gas is nitrogen or argon, and the refining agent is hexachloroethane.
According to still another aspect of the present application, there is provided the use of the above Al-based ternary heat-resistant motor rotor alloy, which is suitable for a motor rotor of a new energy automobile, having a yield strength of not less than 60MPa, a tensile strength of not less than 120MPa, and an electrical conductivity of not less than 31MS/m.
In the present application, "room temperature" means 25 ℃.
The beneficial effects of the application include, but are not limited to:
1. according to the Al-based ternary heat-resistant motor rotor alloy, four elements added by casting aluminum alloy and the adding proportion of the elements are provided, and the types and the proportions of the elements can ensure that the aluminum alloy has good heat resistance, good high-temperature creep resistance and low production cost under the condition of ensuring good conductivity and tensile strength, so that the aluminum alloy is suitable for industrial popularization.
2. Al-based ternary heat-resistant motor rotor according to the applicationThe sub-alloy is characterized in that the proportion of elements in the Al-Fe-Zn alloy is limited, so that Fe element is in micron-order needle-shaped Al 3 In the form of Fe, zn element is solid-dissolved in the aluminum matrix, and solid-solution strengthening and Al of Zn element 3 The second phase strengthening effect of the Fe phase improves the alloy strength together and improves the high-temperature creep resistance.
3. According to the Al-based ternary heat-resistant motor rotor alloy, zn element is dissolved in an aluminum matrix by limiting the element proportion in the Al-Cu-Zn alloy, one part of Cu element is dissolved in the aluminum matrix partially, and the other part of Cu element is dissolved in the aluminum matrix partially, wherein the other part of Cu element is formed by Al 2 Cu exists in a form, so that the solid solution strengthening and the second phase strengthening are realized to jointly improve the alloy strength, and meanwhile, the high-temperature creep resistance is improved.
4. According to the Al-based ternary heat-resistant motor rotor alloy, by limiting the element proportion in the Al-Cu-Si alloy, one part of Cu element is partially dissolved in an aluminum matrix, and the other part of Cu element is used as Al 2 The form of Cu; part of Si element is partially dissolved in the aluminum matrix, and the rest exists in the form of Si particles, so that the solid solution strengthening and the second phase strengthening are realized to jointly improve the alloy strength, and meanwhile, the high-temperature creep resistance is improved.
5. According to the Al-based ternary heat-resistant motor rotor alloy, zn element is dissolved in an aluminum matrix by limiting the element proportion in the Al-Zn-Si alloy, si element is partially dissolved in the aluminum matrix, and the rest exists in the form of Si particles, so that the alloy strength is improved jointly by solid solution strengthening and second phase strengthening, and meanwhile, the high-temperature creep resistance is improved.
6. According to the preparation method of the Al-based ternary heat-resistant motor rotor alloy, the conditions of centrifugal casting and the refining method are limited, so that the cast aluminum alloy has the advantages of low porosity, good mechanical property and good conductivity, and meanwhile, the Al-based ternary heat-resistant motor rotor alloy has good high-temperature creep resistance, and the preparation method is simple and easy to operate and is easy to industrially popularize.
Detailed Description
The present application is described in detail below with reference to examples, but the present application is not limited to these examples.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The reagents or materials used in the present application may be purchased in conventional manners, and unless otherwise indicated, they may be used in conventional manners in the art or according to the product specifications. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present application. The preferred methods and materials described in this patent are illustrative only.
Example 1 preparation of aluminum alloy 1#
The composition of aluminum alloy 1# is: 0.6wt% of Fe, 1.5wt% of Zn and the balance of high-purity Al.
The preparation method of the aluminum alloy No. 1 comprises the following steps:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Fe and Zn components, and uniformly stirring after the weighed Fe and Zn components are completely melted;
(2) Refining at 720 ℃, skimming slag after refining, and standing;
(3) And preheating the casting mould, performing centrifugal casting, stopping rotating the casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the aluminum alloy No. 1.
Wherein the heating temperature in step (1) is 710 ℃; the refining method in the step (2) is to jet nitrogen in a rotating way, and the refining time is 20min; the preheating temperature in the step (3) is 720 ℃, the centrifugal rotating speed is 200r/min, and the casting temperature is 715 ℃; the standing time in the step (2) was 50min.
Example 2 preparation of aluminum alloy 2#
The composition of aluminum alloy 2# is: fe 1.0wt%, zn 1.2wt% and the balance being high purity Al.
The preparation method of the aluminum alloy No. 2 comprises the following steps:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Fe and Zn components, and uniformly stirring after the weighed Fe and Zn components are completely melted;
(2) Refining at 740 ℃, skimming slag after refining, and standing;
(3) And preheating the casting mould, performing centrifugal casting, stopping rotating the casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the aluminum alloy No. 2.
Wherein the heating temperature in step (1) is 750 ℃; the refining method in the step (2) is to jet argon in a rotating way, and the refining time is 10min; the preheating temperature in the step (3) is 740 ℃, the centrifugal rotating speed is 200r/min, and the casting temperature is 730 ℃; the standing time in the step (2) was 40min.
Example 3 preparation of aluminum alloy 3#
The composition of aluminum alloy 3# is: 0.8wt% of Fe, 1.5wt% of Zn and the balance of high-purity Al.
The preparation method of the aluminum alloy 3# comprises the following steps:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Fe and Zn components, and uniformly stirring after the weighed Fe and Zn components are completely melted;
(2) Refining at 730 ℃, skimming slag after refining, and standing;
(3) And preheating the casting mould, performing centrifugal casting, stopping rotating the casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the aluminum alloy 3#.
Wherein the heating temperature in the step (1) is 730 ℃; the refining method in the step (2) is to add hexachloroethane accounting for 0.8 percent of the total mass of the melt, and the refining time is 30 minutes; the preheating temperature in the step (3) is 730 ℃, the centrifugal rotating speed is 300r/min, and the casting temperature is 720 ℃; the standing time in the step (2) was 30min.
Example 4 preparation of aluminum alloy 4#
The composition of aluminum alloy No. 4 is: 0.4wt% of Cu, 2.0wt% of Zn and the balance of high-purity Al.
The preparation method of the aluminum alloy 4# comprises the following steps:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Cu and Zn components, and uniformly stirring after the aluminum ingot is completely melted;
(2) Refining at 720 ℃, skimming slag after refining, and standing;
(3) And preheating the casting mould, performing centrifugal casting, stopping rotating the casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the aluminum alloy No. 4.
Wherein the heating temperature in step (1) is 710 ℃; the refining method in the step (2) is to jet nitrogen in a rotating way, and the refining time is 20min; the preheating temperature in the step (3) is 720 ℃, the centrifugal rotating speed is 200r/min, and the casting temperature is 715 ℃; the standing time in the step (2) was 50min.
Example 5 preparation of aluminum alloy 5#
The composition of aluminum alloy 5# is: cu 1.2wt%, zn0.5 wt% and high purity Al in balance.
The preparation method of the aluminum alloy No. 5 comprises the following steps:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Cu and Zn components, and uniformly stirring after the aluminum ingot is completely melted;
(2) Refining at 740 ℃, skimming slag after refining, and standing;
(3) And preheating the casting mould, performing centrifugal casting, stopping rotating the casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the aluminum alloy No. 5.
Wherein the heating temperature in step (1) is 750 ℃; the refining method in the step (2) is to jet argon in a rotating way, and the refining time is 10min; the preheating temperature in the step (3) is 740 ℃, the centrifugal rotating speed is 200r/min, and the casting temperature is 730 ℃; the standing time in the step (2) was 40min.
Example 6 preparation of aluminum alloy 6#
The composition of aluminum alloy 6# is: cu 1.0wt%, zn 0.8wt% and high purity Al for the rest.
The preparation method of the aluminum alloy 6# comprises the following steps:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Cu and Zn components, and uniformly stirring after the aluminum ingot is completely melted;
(2) Refining at 730 ℃, skimming slag after refining, and standing;
(3) And preheating the casting mould, performing centrifugal casting, stopping rotating the casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the aluminum alloy No. 6.
Wherein the heating temperature in the step (1) is 730 ℃; the refining method in the step (2) is to add hexachloroethane accounting for 0.8 percent of the total mass of the melt, and the refining time is 30 minutes; the preheating temperature in the step (3) is 730 ℃, the centrifugal rotating speed is 300r/min, and the casting temperature is 720 ℃; the standing time in the step (2) was 30min.
Example 7 preparation of aluminum alloy 7#
The composition of aluminum alloy 7# is: 0.4wt% of Cu, 0.4wt% of Si, and the balance of high-purity Al.
The preparation method of the aluminum alloy No. 7 comprises the following steps:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Cu and Si components, and uniformly stirring after the aluminum ingot is completely melted;
(2) Refining at 720 ℃, skimming slag after refining, and standing;
(3) And preheating the casting mould, performing centrifugal casting, stopping rotating the casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the aluminum alloy No. 7.
Wherein the heating temperature in step (1) is 710 ℃; the refining method in the step (2) is to jet nitrogen in a rotating way, and the refining time is 20min; the preheating temperature in the step (3) is 720 ℃, the centrifugal rotating speed is 200r/min, and the casting temperature is 715 ℃; the standing time in the step (2) was 50min.
Example 8 preparation of aluminum alloy 8#
The composition of aluminum alloy 8# is: cu 1.2wt%, si 0.2wt% and high purity Al for the rest.
The preparation method of the aluminum alloy 8# comprises the following steps:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Cu and Si components, and uniformly stirring after the aluminum ingot is completely melted;
(2) Refining at 740 ℃, skimming slag after refining, and standing;
(3) And preheating the casting mould, performing centrifugal casting, stopping rotating the casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the aluminum alloy No. 8.
Wherein the heating temperature in step (1) is 750 ℃; the refining method in the step (2) is to jet argon in a rotating way, and the refining time is 10min; the preheating temperature in the step (3) is 740 ℃, the centrifugal rotating speed is 200r/min, and the casting temperature is 730 ℃; the standing time in the step (2) was 40min.
Example 9 preparation of aluminum alloy 9#
The composition of aluminum alloy 9# is: 0.6wt% of Cu, 0.3wt% of Si and the balance of high-purity Al.
The preparation method of the aluminum alloy 9# comprises the following steps:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Cu and Si components, and uniformly stirring after the aluminum ingot is completely melted;
(2) Refining at 730 ℃, skimming slag after refining, and standing;
(3) And preheating the casting mould, performing centrifugal casting, stopping rotating the casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the aluminum alloy No. 9.
Wherein the heating temperature in the step (1) is 730 ℃; the refining method in the step (2) is to add hexachloroethane accounting for 0.8 percent of the total mass of the melt, and the refining time is 30 minutes; the preheating temperature in the step (3) is 730 ℃, the centrifugal rotating speed is 300r/min, and the casting temperature is 720 ℃; the standing time in the step (2) was 30min.
Example 10 preparation of aluminum alloy 10#
The composition of aluminum alloy 10# is: 0.5wt% of Zn, 0.8wt% of Si and the balance of high-purity Al.
The preparation method of the aluminum alloy 10# comprises the following steps:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Zn and Si components, and uniformly stirring after the weighed Zn and Si components are completely melted;
(2) Refining at 720 ℃, skimming slag after refining, and standing;
(3) And preheating the casting mould, performing centrifugal casting, stopping rotating the casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the aluminum alloy No. 10.
Wherein the heating temperature in step (1) is 710 ℃; the refining method in the step (2) is to jet nitrogen in a rotating way, and the refining time is 20min; the preheating temperature in the step (3) is 720 ℃, the centrifugal rotating speed is 200r/min, and the casting temperature is 715 ℃; the standing time in the step (2) was 50min.
Example 11 preparation of aluminum alloy 11#
The composition of aluminum alloy 11# is: zn 2.0wt%, si 0.2wt% and high purity Al for the rest.
The preparation method of the aluminum alloy 11# comprises the following steps:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Zn and Si components, and uniformly stirring after the weighed Zn and Si components are completely melted;
(2) Refining at 740 ℃, skimming slag after refining, and standing;
(3) And (3) preheating the casting mould, performing centrifugal casting, stopping rotating the casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the aluminum alloy 11#.
Wherein the heating temperature in step (1) is 750 ℃; the refining method in the step (2) is to jet argon in a rotating way, and the refining time is 10min; the preheating temperature in the step (3) is 740 ℃, the centrifugal rotating speed is 200r/min, and the casting temperature is 730 ℃; the standing time in the step (2) was 40min.
Example 12 preparation of aluminum alloy 12#
The composition of aluminum alloy 12# is: zn 1.0wt%, si 0.5wt% and high purity Al in balance.
The preparation method of the aluminum alloy 12# comprises the following steps:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Zn and Si components, and uniformly stirring after the weighed Zn and Si components are completely melted;
(2) Refining at 730 ℃, skimming slag after refining, and standing;
(3) And preheating the casting mould, performing centrifugal casting, stopping rotating the casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the aluminum alloy No. 12.
Wherein the heating temperature in the step (1) is 730 ℃; the refining method in the step (2) is to add hexachloroethane accounting for 0.8 percent of the total mass of the melt, and the refining time is 30 minutes; the preheating temperature in the step (3) is 730 ℃, the centrifugal rotating speed is 300r/min, and the casting temperature is 720 ℃; the standing time in the step (2) was 30min.
Comparative example 1 comparative aluminum alloy 1#
The preparation method of the comparative aluminum alloy 1# is the same as that of the aluminum alloy 3# except that the element composition of the comparative aluminum alloy 1# is 0.2wt% of Fe, 1.0wt% of Zn and the balance of high-purity Al.
Comparative example 2 comparative aluminum alloy 2#
The preparation method of the comparative aluminum alloy No. 2 is the same as that of the aluminum alloy No. 6, except that the element composition of the comparative aluminum alloy No. 2 is Cu 0.2wt%, zn 1.0wt% and the balance is high-purity Al.
Comparative example 3 comparative aluminum alloy 3#
The preparation method of the comparative aluminum alloy 3# is the same as that of the aluminum alloy 9# except that the element composition of the comparative aluminum alloy 3# is Cu 1.0wt%, si 1.0wt% and the balance is high-purity Al.
Comparative example 4 comparative aluminum alloy 4#
The preparation method of the comparative aluminum alloy 4# is the same as that of the aluminum alloy 12# except that the element composition of the comparative aluminum alloy 4# is Zn0.5 wt%, si 1.0wt% and the balance of high-purity Al.
Comparative example 5 comparative aluminum alloy 5#
The elemental composition of comparative aluminum alloy 5# and aluminum alloy 3# are the same, except that the soak temperature in step (2) in the preparation method of comparative aluminum alloy 5# is 710 ℃.
Comparative example 6 comparative aluminum alloy 6#
The elemental composition of comparative aluminum alloy 6# and aluminum alloy 3# are the same, except that step (2) of the comparative aluminum alloy 6# was not refined after heat preservation at 740 ℃.
Example 13 characterization of Performance
1. Sampling the respective end surfaces of an aluminum alloy 1# -12# and a comparative aluminum alloy 1# -6# respectively, wherein the size of a conductivity sample meets the requirements of GB/T12966-2008, conducting conductivity test, the size standard of a mechanical property test sample meets ASTM E8, conducting tensile property analysis, conducting heat resistance test on a RD2-3 type high-temperature creep and endurance strength tester, testing the temperature at 200 ℃, loading at 240MPa, and determining the alloy endurance time. The results of each test are shown in Table 1.
TABLE 1 mechanical Properties, conductivity and Heat resistance test results
The result shows that the motor rotor aluminum alloy 1# 12 prepared by adopting the element components defined by the application has excellent tensile strength and yield strength, excellent mechanical properties, good conductivity, and good high-temperature durability, and can still meet the requirements of 29MS/m and above; wherein, the lasting time of the aluminum alloy 3#, the aluminum alloy 6#, the aluminum alloy 9# and the aluminum alloy 12# which adopt the specific element proportion defined by the application reaches 268h and above, which shows that the high-temperature creep resistance is good.
The ratio of Fe to Zn in the comparative aluminum alloy No. 1 is smaller than the ratio defined by the application, and the final result shows that the strength and other mechanical properties are poor, the tensile strength and the yield strength are both low, the high-temperature lasting time is short, and the high-temperature creep resistance is poor. The ratio of Cu to Zn in the comparative aluminum alloy No. 2 is smaller than the range defined by the application, and finally shows that the mechanical property is poor and the high-temperature creep resistance is poor. The ratio of Cu to Si in the comparative aluminum alloy 3# is smaller than the range defined by the application, and finally shows poor mechanical properties and poor high-temperature creep resistance. The comparative aluminum alloy No. 4 has a smaller Zn to Si ratio than the range defined by the application, and finally shows poor mechanical properties and poor high-temperature creep resistance.
Compared with the aluminum alloy 5# in the step (2), the heat preservation temperature is lower, the molten metal cannot be fully melted, part of the alloy cannot be fully melted into the molten metal, and the mechanical property and the high-temperature creep resistance are affected; the comparison of aluminum alloy No. 6 does not undergo a refining step, and finally shows that the strength, the conductivity and the high-temperature creep resistance are poor, and the main reasons are that the oxidized slag inclusion and the gas generated by the reaction cannot be removed, the slag inclusion damages the continuity of a metal matrix, and the generated gas causes larger pores in casting and also damages the continuity of metal.
The above description is only an example of the present application, and the scope of the present application is not limited to the specific examples, but is defined by the claims of the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the technical idea and principle of the present application should be included in the protection scope of the present application.
Claims (3)
1. An Al-based ternary heat-resistant motor rotor alloy is characterized by comprising 0.6-1.0wt% of Fe, 1.2-1.5wt% of Zn and the balance of Al; or Cu 0.4-1.2wt%, zn0.5-2.0wt% and Al for the rest; or Cu 0.4-1.2wt%, si 0.2-0.4wt% and Al for the rest; or comprises 0.5 to 2.0 weight percent of Zn, 0.2 to 0.8 weight percent of Si and the balance of Al;
wherein, in the Al-Fe-Zn alloy, the content ratio of Fe to Zn is (0.5-0.8): 1, a step of;
in the Al-Cu-Zn alloy, the content ratio of Cu to Zn is (0.3-2.0): 1, a step of;
in the Al-Cu-Si alloy, the content ratio of Cu to Si is (1.3-3.0): 1, a step of;
in the Al-Zn-Si alloy, the content ratio of Zn to Si is (1.0-3.0): 1, a step of;
the preparation method of the Al-based ternary heat-resistant motor rotor alloy comprises the following steps:
(1) Placing an aluminum ingot in a smelting furnace, heating to melt the aluminum ingot, adding weighed Fe and Zn components or weighed Cu and Si components or weighed Zn and Si components, and stirring uniformly after the aluminum ingot is completely melted;
(2) Refining at 720-740 deg.c, skimming slag and setting;
(3) Preheating a casting mould, performing centrifugal casting, stopping rotation of casting equipment after the alloy is solidified, and naturally cooling to room temperature to obtain the Al-based ternary heat-resistant motor rotor alloy;
the refining method in the step (2) is to jet gas in a rotating way or add a refining agent accounting for 0.5 to 1 percent of the total mass of the melt, and the refining time is 10 to 30 minutes;
it is suitable for the motor rotor of the new energy automobile, the yield strength is not less than 60MPa, the tensile strength is not less than 120MPa, and the conductivity is not less than 31MS/m.
2. The Al-based ternary heat resistant motor rotor alloy of claim 1 wherein the heating temperature in step (1) is 710-750 ℃;
the preheating temperature in the step (3) is 720-740 ℃, the centrifugal speed is 200-300r/min, and the casting temperature is 715-730 ℃.
3. The Al-based ternary heat resistant motor rotor alloy of claim 1 wherein the gas is nitrogen or argon and the refining agent is hexachloroethane.
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