WO2018228059A1 - Alliage de magnésium à conductivité thermique élevée, boîtier d'onduleur, onduleur et automobile - Google Patents

Alliage de magnésium à conductivité thermique élevée, boîtier d'onduleur, onduleur et automobile Download PDF

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Publication number
WO2018228059A1
WO2018228059A1 PCT/CN2018/084488 CN2018084488W WO2018228059A1 WO 2018228059 A1 WO2018228059 A1 WO 2018228059A1 CN 2018084488 W CN2018084488 W CN 2018084488W WO 2018228059 A1 WO2018228059 A1 WO 2018228059A1
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WO
WIPO (PCT)
Prior art keywords
weight
magnesium alloy
thermal conductivity
high thermal
inverter
Prior art date
Application number
PCT/CN2018/084488
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English (en)
Chinese (zh)
Inventor
郭强
曹梦梦
巩泉雨
Original Assignee
比亚迪股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Priority to EP18818152.3A priority Critical patent/EP3640356B1/fr
Priority to US16/622,605 priority patent/US20210147963A1/en
Publication of WO2018228059A1 publication Critical patent/WO2018228059A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2202/00—Physical properties

Definitions

  • the present application relates to the field of material technology, and in particular to a high thermal conductivity magnesium alloy and its application, and more particularly to a high thermal conductivity magnesium alloy, at least a portion of an inverter housing formed of the above high thermal conductivity magnesium alloy, including the above inverter An inverter of the housing and a car including the above inverter.
  • the conventional die-cast magnesium alloy currently available on the market is AZ91D, and its main components are: Al: 8.5 to 9.5%, Zn: 0.45 to 0.90%, Mn: 0.17 to 0.4%, Si: ⁇ 0.05%, Cu: ⁇ 0.025%, Ni: ⁇ 0.001%, Fe: ⁇ 0.004%, and the balance is magnesium.
  • the material has good flow forming performance, low cost and high mechanical properties, but the thermal conductivity is small, only ⁇ 60W/m.K, which limits the wide application of magnesium alloy materials.
  • an object of the present application is to propose a die-cast magnesium alloy having good thermal conductivity or at the same time having desirable mechanical properties.
  • the present application provides a high thermal conductivity magnesium alloy.
  • the high thermal conductivity magnesium alloy comprises: 2.0 to 4.0% by weight of Al, 0.1 to 0.3% by weight of Mn, 1.0 to 2.0% by weight of La, based on the total mass of the high thermal conductivity magnesium alloy, 2.0 to 4.0% by weight of Ce, 0.1 to 1.0% by weight of Nd, 0.5 to 2.0% by weight of Zn, 0.1 to 0.5% by weight of Ca, less than 0.1% by weight of Sr, less than 0.1% by weight of Cu, and the balance magnesium.
  • the inventors have found that a magnesium alloy containing the above components has a very high thermal conductivity and an excellent mechanical property, and can be effectively used in conditions and environments requiring high thermal conductivity and light weight, such as for manufacturing automobiles.
  • the inverter housing and the like greatly expand the application range of the magnesium alloy.
  • the present application provides an inverter housing.
  • the inverter housing is formed from the high thermal conductivity magnesium alloy previously described.
  • the inverter housing has a very high thermal conductivity and has very good heat dissipation performance, so that the safety and service life of the inverter using the inverter housing are significantly improved.
  • the present application provides an inverter.
  • the inverter includes the inverter housing described above. The inventor found that the inverter has good heat dissipation performance, the safety of use is obviously improved, and the service life is significantly prolonged.
  • the present application provides an automobile.
  • the automobile includes the inverter described above.
  • the vehicle has all of the features and advantages of the previously described inverter and will not be described again.
  • Embodiments of the present application are described in detail below.
  • the embodiments described below are illustrative and are merely illustrative of the present application and are not to be construed as limiting.
  • specific techniques or conditions are not indicated in the examples, they are carried out according to the techniques or conditions described in the literature in the art or in accordance with the product specifications.
  • the reagents or instruments used are not indicated by the manufacturer, and are conventional products that can be obtained commercially.
  • the present application provides a high thermal conductivity magnesium alloy.
  • the high thermal conductivity magnesium alloy comprises: 2.0 to 4.0% by weight of Al, 0.1 to 0.3% by weight of Mn, 1.0 to 2.0% by weight of La, based on the total mass of the high thermal conductivity magnesium alloy, 2.0 to 4.0% by weight of Ce, 0.1 to 1.0% by weight of Nd, 0.5 to 2.0% by weight of Zn, 0.1 to 0.5% by weight of Ca, less than 0.1% by weight of Sr, less than 0.1% by weight of Cu, and the balance magnesium.
  • the inventors have found that a magnesium alloy containing the above components has a very high thermal conductivity and an excellent mechanical property, and can be effectively used in conditions and environments requiring high thermal conductivity and light weight, such as for manufacturing automobiles.
  • the inverter housing and the like greatly expand the application range of the magnesium alloy.
  • magnesium alloy in the above magnesium alloy, aluminum can improve the strength and corrosion resistance of the magnesium alloy; manganese can increase the elongation and toughness of the magnesium alloy; and addition of rare earth elements such as La, Ce, Nd can significantly improve magnesium
  • the high temperature performance of the alloy, and in the casting process can also significantly refine the magnesium alloy particles, and magnesium can form a solid solution with the above rare earth elements, and the magnesium-rich region is a low melting point simple eutectic, and is distributed in a network at the grain boundary. The formation of micropores is inhibited, thereby improving the casting properties and thermal conductivity of magnesium alloys.
  • Nd has a great influence on the fine grain strengthening of magnesium alloys, and the refinement effect of Ce on microstructures is beneficial to improve the mechanical properties and corrosion resistance of magnesium alloys.
  • Zinc can exert solid solution strengthening and form a strengthening phase; adding a small amount of Ca and Sr can prevent oxidation of the magnesium alloy during the melting process.
  • the inventors mix the above components in the above ratio to form a magnesium alloy, and the components cooperate with each other, and the obtained magnesium alloy has excellent thermal conductivity and mechanical properties at the same time, and can be effectively applied to various fields, particularly for thermal conductivity. Higher demand situation.
  • the magnesium alloy in order to further improve the use performance of the magnesium alloy, may include: 0.15 to 0.3% by weight of Mn, and 2.5 to 4.0% by weight of Ce based on the total mass of the high heat conductive magnesium alloy. Therefore, the magnesium alloy can have the desired thermal conductivity while having good mechanical properties, so as to better meet the requirements of different working environments and conditions.
  • the magnesium alloy may include: 3.0 wt% Al, 0.25 wt% Mn, 1.55 wt% La, 3.0 wt% Ce 0.13 wt% Nd, 0.6 wt% Zn, 0.15 wt% Ca, less than 0.1 wt% Sr, less than 0.1 wt% Cu, and the balance magnesium.
  • the magnesium alloy may include: 2.0% by weight of Al, 0.15% by weight of Mn, 2.0% by weight of La, and 2.5% by weight. Ce, 0.1% by weight of Nd, 2.0% by weight of Zn, 0.1% by weight of Ca, less than 0.1% by weight of Sr, less than 0.1% by weight of Cu, and the balance of magnesium.
  • the magnesium alloy may include: 4.0% by weight of Al, 0.1% by weight of Mn, 1.0% by weight of La, 2.0% by weight based on the total mass of the high thermal conductivity magnesium alloy. Ce, 1.0% by weight of Nd, 0.5% by weight of Zn, 0.5% by weight of Ca, less than 0.1% by weight of Sr, less than 0.1% by weight of Cu, and the balance of magnesium.
  • the magnesium alloy may include: 2.5% by weight of Al, 0.3% by weight of Mn, 1.0% by weight of La, 4.0% by weight Ce, 0.5% by weight of Nd, 1.5% by weight of Zn, 0.3% by weight of Ca, less than 0.1% by weight of Sr, less than 0.1% by weight of Cu, and the balance of magnesium.
  • the inventors have found that a magnesium alloy having the above formulation has excellent thermal conductivity and excellent mechanical properties.
  • the inventors have found through extensive experiments that the magnesium alloy according to the embodiment of the present application has significantly better thermal conductivity than the existing magnesium alloy, and the experimental results show that the thermal conductivity of the magnesium alloy having the above composition and ratio can be greater than 110 w/mk. . Therefore, the magnesium alloy can be effectively applied to various environments having high requirements for thermal conductivity, and the magnesium alloy has low density, high specific strength, large specific modulus, good shock absorption, and resistance to organic matter and alkali. The corrosion performance is good and so on.
  • the magnesium alloy according to an embodiment of the present application may further satisfy at least one of the following conditions: tensile strength greater than 220 MPa; yield strength greater than 150 MPa; and elongation greater than 4%.
  • the magnesium alloy may satisfy only one of the above conditions, such as satisfying only the tensile strength greater than 220 MPa, satisfying only the yield strength greater than 150 MPa, or only satisfying the elongation greater than 4%; and simultaneously satisfying the above two conditions, such as simultaneously satisfying The tensile strength is greater than 220 MPa and the yield strength is greater than 150 MPa, while the tensile strength is greater than 220 MPa and the elongation is greater than 4%, or both the yield strength is greater than 150 MPa and the elongation is greater than 4%; and the tensile strength is greater than 220 MPa, The yield strength is greater than 150 MPa and the elongation is greater than 4%. Therefore, the magnesium alloy has good thermal conductivity and mechanical properties, and can meet the requirements of different fields and
  • the present application provides an inverter housing.
  • the inverter housing is formed from the high thermal conductivity magnesium alloy previously described.
  • the inverter housing has a very high thermal conductivity and has very good heat dissipation performance, so that the safety and service life of the inverter using the inverter housing are significantly improved.
  • the specific structure and the like of the inverter housing are not particularly limited, and may be any inverter housing structure known in the art, and can be flexibly selected by those skilled in the art according to actual needs.
  • a part of the inverter housing, such as a portion requiring high thermal conductivity, is prepared by the magnesium alloy of the present application, or the inverter housing may be entirely prepared by the magnesium alloy of the present application, and those skilled in the art may also according to the cost. Flexible choices such as usage requirements.
  • the present application provides an inverter.
  • the inverter includes the inverter housing described above. The inventor found that the inverter has good heat dissipation performance, the safety of use is obviously improved, and the service life is significantly prolonged. It will be understood by those skilled in the art that the inverter has all the features and advantages of the inverter housing described above, and details are not described herein again.
  • the inverter in addition to the inverter housing described above, the inverter further includes necessary structures and components that the conventional inverter has, such as an inverter bridge, control logic, and filter circuit, etc., I will not repeat them one by one.
  • the present application provides an automobile.
  • the automobile includes the inverter described above. Therefore, the automobile inverter has better thermal conductivity and mechanical properties, and the safety is greatly improved.
  • the inverter housing is prepared from the magnesium alloy, which is beneficial to the weight reduction of the automobile and the user experience is better.
  • the vehicle has all the features and advantages of the inverter described above, and will not be further described herein.
  • the automobile has the necessary structures and components that the conventional automobile has, such as a vehicle body, an engine, a wheel, an interior, and the like, which will not be described in detail herein.
  • Magnesium alloy formulation 3.0 wt% Al, 0.25 wt% Mn, 1.55 wt% La, 3.0 wt% Ce, 0.13 wt% Nd, 0.6 wt% Zn, 0.15 wt% Ca, less than 0.1 wt% Sr, less than 0.1% by weight of Cu, and the balance of magnesium
  • Preparation steps the pure magnesium ingot and the pure aluminum ingot are smelted in a melting furnace, the melting temperature is 700-750 ° C; the Mg-Ca, Mg-Mn, Mg-Zn intermediate alloy is added to the melting furnace to completely melt and smelt Temperature 700-750 ° C; adding Mg-La, Mg-Ce, Mg-Nd master alloy to the melting furnace, melting temperature 700-750 ° C, while adding the surface of the cover melt; 15% of the melt with RJ-5 flux Minute refining treatment, refining temperature 730 ° C - 760 ° C, and then standing for 80-120 minutes, temperature 650 ° C - 730 ° C, wherein Sr and Cu can be introduced through the impurities in the above raw materials, so do not need to be added separately.
  • Magnesium alloy formulation 2.0 wt% Al, 0.15 wt% Mn, 2.0 wt% La, 2.5% wt% Ce, 0.1 wt% Nd, 2.0 wt% Zn, 0.1 wt% Ca, less than 0.1 wt% Sr, less than 0.1% by weight of Cu, and the balance of magnesium.
  • Magnesium alloy formulation 4.0 wt% Al, 0.1 wt% Mn, 1.0 wt% La, 2.0 wt% Ce, 1.0 wt% Nd, 0.5 wt% Zn, 0.5 wt% Ca, less than 0.1 wt% Sr, less than 0.1% by weight of Cu, and the balance of magnesium.
  • Magnesium alloy formulation 2.5 wt% Al, 0.3 wt% Mn, 1.0 wt% La, 4.0 wt% Ce, 0.5 wt% Nd, 1.5 wt% Zn, 0.3 wt% Ca, less than 0.1 wt% Sr, less than 0.1% by weight of Cu, and the balance of magnesium.
  • Magnesium alloy formulation 6 wt% Al, 0.4 wt% Mn, 0.48 wt% Zn, 1.2 wt% Ca, less than 0.1 wt% Sr, less than 0.1 wt% Cu, and the balance magnesium.
  • Magnesium alloy formulation 6.0 wt% Al, 0.25 wt% Mn, 1.55 wt% La, 3.0 wt% Ce, 0.013 wt% Nd, 0.6 wt% Zn, 0.15 wt% Ca, less than 0.1 wt% Sr, less than 0.1% by weight of Cu, and the balance of magnesium.
  • Example 1 Example 2 Example 3 Example 4 Comparative example 1 Comparative example 2
  • the magnesium alloy prepared in Example 1 and the AZ91D magnesium alloy were subjected to mechanical property test and material forming fluidity test, wherein the mechanical property test standard was ISO 6892-1, and the sample for measuring the fluidity of the material was measured by a mosquito mold and atmosphere. Die-casting molding, mold temperature 200 ° C, die-casting temperature 700 ° C, injection speed 3 laps, the starting point of the second speed is 140 mm, record the length of the injection mosquito mold, for analogy material flow. The results are shown in Tables 2 and 3, respectively.
  • the high thermal conductivity magnesium alloy of the present application has a very high thermal conductivity and heat dissipation capability, and has high tensile strength, yield strength and elongation, and has higher tensile strength and elongation than AZ91D magnesium alloy. Very good formability and recycling capacity.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Conductive Materials (AREA)

Abstract

La présente invention concerne un alliage de magnésium à conductivité thermique élevée, un boîtier d'onduleur, un onduleur et une automobile, l'alliage de magnésium à conductivité thermique élevée comprenant : de 2,0 à 4,0 % en poids d'Al, de 0,1 à 0,3 % en poids de Mn, de 1,0 à 2,0 % en poids de La, de 2,0 à 4,0 % en poids de Ce, de 0,1 à 1,0 % en poids de Nd, de 0,5 à 2,0 % en poids de Zn, de 0,1 à 0,5 % en poids de Ca, moins de 0,1 % en poids de Sr, moins de 0,1 % en poids de Cu, et le complément étant constitué de magnésium.
PCT/CN2018/084488 2017-06-15 2018-04-25 Alliage de magnésium à conductivité thermique élevée, boîtier d'onduleur, onduleur et automobile WO2018228059A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP18818152.3A EP3640356B1 (fr) 2017-06-15 2018-04-25 Alliage de magnésium à conductivité thermique élevée, boîtier d'onduleur, onduleur et automobile
US16/622,605 US20210147963A1 (en) 2017-06-15 2018-04-25 Magnesium alloy with high thermal conductivity, inverter housing, inverter and vehicle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710453134.2 2017-06-15
CN201710453134.2A CN109136699B (zh) 2017-06-15 2017-06-15 高导热镁合金、逆变器壳体、逆变器及汽车

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WO2018228059A1 true WO2018228059A1 (fr) 2018-12-20

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CN115044812A (zh) * 2022-06-17 2022-09-13 北京机科国创轻量化科学研究院有限公司 一种高延伸率微合金化改性az31镁合金薄板材料及其制备方法

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CN115398017B (zh) * 2020-02-07 2024-05-14 株式会社镁州港 镁合金及其制造方法

Also Published As

Publication number Publication date
US20210147963A1 (en) 2021-05-20
EP3640356A1 (fr) 2020-04-22
EP3640356A4 (fr) 2020-04-22
EP3640356B1 (fr) 2021-03-31
CN109136699A (zh) 2019-01-04
CN109136699B (zh) 2021-07-09

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