Classifications

• • 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
  • C22C1/02—Making non-ferrous alloys by melting
  • C22C1/026—Alloys based on aluminium
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C21/00—Alloys based on aluminium
  • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
  • B22D21/002—Castings of light metals
  • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
  • C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
  • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
  • F28F21/081—Heat exchange elements made from metals or metal alloys
  • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys

Definitions

• the present disclosure relates to the field of aluminum alloy technologies, and specifically to an aluminum alloy and a preparation method and application thereof.
• Die casting is a precision casting process that uses high pressure to force a metal molten fluid into a complexly shaped metal die. Die castings formed by die casting have a very small dimensional tolerance and high surface precision. In most cases, the die castings can be assembled and applied without the need for turning. Die casting of aluminum alloys has high requirements for mechanical properties of aluminum alloy materials, such as yield strength, tensile strength, elongation rate, flowability of the melt, etc.
• the thermal conductivity of the material often needs to be sacrificed under the conditions of comprehensively considering the properties of the material in various aspects, such as yield strength, tensile strength, elongation rate and other mechanical properties.
• the heat dissipation performance of existing die-cast aluminum alloys when used as a heat dissipating material decreases.
• the present disclosure provides an aluminum alloy and a preparation method and application thereof.
• the present disclosure provides an aluminum alloy, including, in percentages by weight: 9%-11% of Si, 0.001%-0.2% of Mg, 0.3%-0.7% of Fe, 0.003%-0.04% of Sr, 0.003%-0.03% of B, 0.001%-0.2% of Zn, 0.001%-0.1% of Cu, 0.001%-0.09% of Mn, less than 0.05% of Cr, 0.002%-0.05% of Ga, 0.001%-0.01% of Mo, and the balance of aluminum and other elements, where a total amount of the other elements is lower than 0.1%.
• a content of Cr is 0.002% ⁇ Cr ⁇ 0.05%.
• a weight ratio of Sr and B is (1-1.6):1.
• a weight ratio of Sr, B and Ga is (1-2):1:(1.5-2).
• a weight ratio of Si, Fe, Mn and Mg is (19-16):1:(0.1-0.13):(0.1-0.14).
• a weight ratio of Fe and Mo is 1:(0.002-0.008).
• the other elements include one or more of Pb, Bi, or Sb.
• a yield strength of the aluminum alloy is 140-170 MPa
• a tensile strength of the aluminum alloy is 220-300 MPa
• an elongation rate of the aluminum alloy is 7%-15%
• a thermal conductivity of the aluminum alloy is 170-177 W/(k*m).
• the present disclosure further provides a method for preparing the aluminum alloy described above, including: weighing required amounts of raw materials according to a ratio of elements in the aluminum alloy; adding the raw materials to a smelting furnace for smelting to obtain a molten solution; casting the molten solution after slag removal and refinement and degassing treatment to obtain an aluminum alloy ingot; and die-casting the aluminum alloy ingot.
• the method further includes: performing artificial aging treatment on the aluminum alloy ingot.
• a treatment temperature of the artificial aging treatment is 320-330°C and a treatment time of the artificial aging treatment is 3-4 h.
• a yield strength of the aluminum alloy after the artificial aging treatment is 100-120 MPa
• a tensile strength of the aluminum alloy after the artificial aging treatment is 220-241 MPa
• an elongation rate of the aluminum alloy after the artificial aging treatment is 8%-15%
• a thermal conductivity of the aluminum alloy after the artificial aging treatment is 191-199 W/(k*m).
• the present disclosure also provides an application of the aluminum alloy described above on a radiator.
• the present disclosure also provides a radiator, where the radiator is at least partially formed of the aluminum alloy described above.
• the aluminum alloy by adjusting and controlling the ratio of elements in the aluminum alloy, the aluminum alloy has a high yield strength, tensile strength and elongation rate, and has a high thermal conductivity and excellent flowability without sacrificing various mechanical properties.
• the aluminum alloy has low process requirements and good process adaptability.
• the present disclosure provides an aluminum alloy, including, in percentages by weight: 9%-11% of Si, 0.001%-0.2% of Mg, 0.3%-0.7% of Fe, 0.003%-0.04% of Sr, 0.003%-0.03% of B, 0.001%-0.2% of Zn, 0.001%-0.1% of Cu, 0.001%-0.09% of Mn, less than 0.05% of Cr, 0.002%-0.05% of Ga, 0.001%-0.01% of Mo, and the balance of aluminum and other elements, where a total amount of the other elements is lower than 0.1%.
• the composition of the aluminum alloy is as follows in percentages by weight: the content of Si is 9%-11%, the content of Mg is 0.001%-0.2%, the content of Fe is 0.3%-0.7%, the content of Sr is 0.003%-0.04%, the content of B is 0.003%-0.03%, the content of Zn is 0.001%-0.2%, the content of Cu is 0.001%-0.1%, the content of Mn is 0.001%-0.09%, the content of Cr is ⁇ 0.05%, the content of Ga is 0.002%-0.05%, the content of Mo is 0.001%-0.01%, and the balance is aluminum and other elements, where a total amount of the other elements is lower than 0.1%.
• the content of Si is 9.4%, 9.5%, 9.7%, or 9.8%
• the content of Mg is 0.05%, 0.07%, 0.09%, 0.11%, 0.15%, or 0.19%
• the content of Fe is 0.3%, 0.32%, 0.43%, or 0.52%
• the content of Sr is 0.005%, 0.01%, 0.011%, 0.015%, 0.021%, or 0.025%
• the content of B is 0.005%, 0.01%, 0.011%, 0.015%, 0.016%, or 0.019%
• the content of Zn is 0.005%, 0.01%, 0.02%, 0.05%, 0.09%, 0.12%, or 0.17%
• the content of Cu is 0.005%, 0.01%, 0.02%, 0.05%, or 0.09%
• the content of Mn is 0.005%, 0.01%, 0.02%, 0.05%, or 0.09%
• the content of Cr is 0.01%, 0.02%, 0.03%, or 0.05%
• the content of Ga is
• the content of Cu is 0.001%-0.1%, and the content of Mn is 0.001%-0.09%.
• a small amount of Cu and Mn in the aluminum alloy results in an improvement in the yield strength and thermal conductivity of the aluminum alloy material.
• the content of Cr is 0.002% ⁇ Cr ⁇ 0.05%, for example, 0.002%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, etc.
• a weight ratio of Sr and B is (1-1.6):1, for example, 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, etc.
• Sr and B has a great improvement on the internal structure of the aluminum alloy, and has a good effect on the improvement of casting quality.
• the detailed mechanism is mainly as follows: Sr and B promote the formation of fine grains in the aluminum alloy, so that the coarse eutectic silicon becomes smaller and fibrous, the reaction between Al and B to generate AlB 2 can reduce the solid solubility of impurity elements, and the element B promotes the refinement of grains and optimizes the grains structure.
• Sr > 0.04% and B > 0.03% the mechanical properties of the aluminum alloy increase significantly, but the thermal conductivity decreases seriously.
• the coarse eutectic silicon leads to a serious decrease in intercrystalline thermal conductivity, a decrease in the thermal conductivity of the aluminum alloy, and low mechanical properties.
• Sr > 0.04% but B ⁇ 0.003% in the aluminum alloy the mechanical properties of the aluminum alloy increase significantly and the thermal conductivity decreases significantly.
• a weight ratio of Sr, B, and Ga is (1-2):1:(1.5-2), for example, 1:1:1.5, 1.5:1:1.5, 2:1:1.5, 1:1:2, 1.5:1:2, 2:1:2, etc.
• the addition of the element Ga can increase the nucleation rate and decrease the speed of nucleus growth, promoting grain refinement, improving mechanical properties, optimizing the intercrystalline structure, improving the thermal conductivity, and improving the strength.
• Ga > 0.05% the mechanical properties of the aluminum alloy drop sharply.
• the addition of the element Ga can significantly improve the mechanical properties of the aluminum alloy after thermal treatment.
• the content of Ga is 0.002%-0.05%, the yield strength of the aluminum alloy after thermal treatment at 320°C may be maintained between 100-120 Mpa.
• the yield strength of the aluminum alloy after thermal treatment under the same conditions is only 95 Mpa by relying on the deteriorating agents Sr and B alone.
• a weight ratio of Si, Fe, Mn, and Mg is (19-16):1:(0.1-0.13):(0.1-0.14), for example, 19:1:0.1:0.1, 18:1:0.1:0.1, 17:1:0.1:0.1, 16:1:0.1:0.1, 16:1:0.12:0.1, 16:1:0.13:0.1, 16:1:0.1:0.12, 16:1:0.1:0.14, etc.
• the addition of Si in the above ratio range not only ensures good flowability and moldability of the aluminum alloy, but also ensures good mechanical properties without sacrificing the thermal conductivity of the aluminum alloy. After artificial aging, the thermal conductivity may reach 198 W/(m*K). When the Si content is too low, the flowability of the aluminum alloy is poor, making it not easy to form complex thin-walled members, and the mechanical properties are low. When the Si content is too high, the thermal conductivity of the aluminum alloy is low. The thermal conductivity of the aluminum alloy is low when the Fe content exceeds the above range. Under the condition that the aluminum alloy has good flowability and anti-sticking performance and excellent mechanical properties, the weight ratio of Si and Fe is (19-16):1, and in this case, the Fe content is strictly controlled to be within the range of 0.3%-0.7%.
• a small amount of Mg and Fe in the aluminum alloy can react with Si to form Mg 2 Si and Al 12 Fe 3 Si, not only increases the strength of the aluminum alloy, but also has a positive effect on the thermal treatment, i.e., it also can improve the thermal conductivity of the aluminum alloy.
• the thermal conductivity of the aluminum alloy after artificial aging is greatly improved, without reducing the mechanical properties too much.
• the relationship between the contents of Fe and Mn also affects the thermal conductivity and anti-sticking performance of the aluminum alloy.
• the content of Fe is in the range of 0.3%-0.7%
• the content of Mn satisfies 0.001% ⁇ Mn ⁇ 0.09%
• the weight ratio of Fe and Mn satisfies 1:(0.1-0.13)
• the elements Fe and Mn can reduce the reaction of the aluminum alloy with the mold during die casting, and reduce the anti-sticking performance of the aluminum alloy, allowing the aluminum alloy to be used to form more complex and precision devices.
• the content of Mn is too high, the joint effect of Mn and Fe has great impact on the thermal conductivity of the aluminum alloy, and the anti-sticking performance of the aluminum alloy is not improved.
• the needle-shaped ferrite will block the motion such as slippage of the material on the crystal surface, which not only affects the flowability of the aluminum alloy, but also reduces the intercrystalline thermal conductivity.
• the reaction of Mn with Al to form Al 6 Mn also reduces the machining performance of the aluminum alloy.
• the granular Al 15 (FeMn) 3 Si 2 formed in the aluminum alloy can serve as a heterogeneous nucleation substrate for the aging-strengthened phase Mg 2 Si, promoting Mg 2 Si phase precipitation, and also improving the solid solubility of Fe, so that the aluminum alloy has a good plasticity.
• a weight ratio of Fe and Mo is 1:(0.002-0.008), for example, 1:0.002, 1:0.003, 1:0.004, 1:0.005, 1:0.006, 1:0.007, 1:0.008, etc.
• the content of Mo is 0.001%-0.01%, the hardness and mechanical properties of the aluminum alloy are significantly improved.
• the binding of Fe to Mo effectively improves the strength and hardness of the Al-Fe matrix.
• a too high Mo content leads to a decrease in the toughness of the aluminum alloy.
• the element Mo effectively improves the number of solute atoms of the solid solution, and improves the stability of the beta tissue in the aluminum alloy tissue.
• the resistance of the misalignment motion is increased due to the solute atom-dislocation interaction, so that the microhardness of the aluminum alloy increases with the increase of the content of the element Mo.
• the other elements include one or more of Pb, Bi, or Sb.
• a yield strength of the aluminum alloy is 140-170 MPa (for example, 140 MPa, 145 MPa, 150 MPa, 155 MPa, 160 MPa, 165 MPa, 170 MPa, etc.), a tensile strength of the aluminum alloy is 220-280 MPa (for example, 220 MPa, 230 MPa, 240 MPa, 250 MPa, 260 MPa, 270 MPa, 280 MPa, etc.), an elongation rate of the aluminum alloy is 7%-15% (for example, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc.), and a thermal conductivity of the aluminum alloy is 170-177 W/(k*m) (for example, 170 W/(k*m), 171 W/(k*m), 172 W/(k*m), 173 W/(k*m), 174 W/(k*m), 175 W/(k*m), 176 W/(k*m), 177 W/(k*m
• the above properties of the aluminum alloy are test parameters of the aluminum alloy before artificial aging.
• the present disclosure further provides a method for preparing the aluminum alloy described above, including: weighing required amounts of raw materials according to a ratio of elements in the aluminum alloy; adding the raw materials to a smelting furnace for smelting to obtain a molten solution; casting the molten solution after slag removal and refinement and degassing treatment to obtain an aluminum alloy ingot; and die-casting the aluminum alloy ingot.
• the method may include the following steps: weighing required amounts of raw materials according to a ratio of elements in the aluminum alloy, melting the raw materials in a smelting furnace, performing slag removal and refinement and degassing treatment and then casting to obtain an aluminum alloy ingot, and then die-casting the aluminum alloy ingot.
• the raw materials include an aluminum-containing material, a Si-containing material, a Mg-containing material, a Fe-containing material, a Sr-containing material, a B-containing material, a Zn-containing material, a Cu-containing material, a Mn-containing material, a Cr-containing material, a Ga-containing material, and a Mo-containing material.
• the aluminum-containing material, the Si-containing material, the Mg-containing material, the Fe-containing material, the Sr-containing material, the B-containing material, the Zn-containing material, the Cu-containing material, the Mn-containing material, the Cr-containing material, the Ga-containing material, and the Mo-containing material may be materials capable of providing the various elements required for preparing the die-cast aluminum alloy of the present disclosure, and may be alloys containing the above elements or simple substances, as long as the components in the aluminum alloy obtained after smelting the added aluminum alloy raw materials are within the above ranges.
• the method further includes: performing artificial aging treatment on the aluminum alloy ingot.
• a treatment temperature of the artificial aging treatment is 320-330°C (for example, 320°C, 321°C, 322°C, 323°C, 324°C, 325°C, 326°C, 327°C, 328°C, 329°C, 330°C, etc.)
• a treatment time of the artificial aging treatment is 3-4 h (for example, 3 h, 3.5 h, 4 h, etc.).
• a yield strength of the aluminum alloy after the artificial aging treatment is 100-120 MPa (for example, 100 MPa, 105 MPa, 110 MPa, 115 MPa, 120 MPa, etc.), a tensile strength of the aluminum alloy after the artificial aging treatment is 220-241 MPa (220 MPa, 225 MPa, 230 MPa, 235 MPa, 240 MPa, etc.), an elongation rate of the aluminum alloy after the artificial aging treatment is 8%-15% (for example, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc.), and a thermal conductivity of the aluminum alloy after the artificial aging treatment is 191-199 W/(k*m) (for example, 191 W/(k*m), 192 W/(k*m), 193 W/(k*m), 194 W/(k*m), 195 W/(k*m), 196 W/(k*m), 197 W/(k*m), 198 W/
• the aluminum alloy after the artificial aging have a certain degree of decrease in yield strength and tensile strength, however its thermal conductivity increases with the increase of the treatment temperature.
• the present disclosure also provides an application of the aluminum alloy described above on a radiator.
• the present disclosure provides a radiator.
• the radiator includes the aluminum alloy described above, or in other words, the radiator is at least partially formed of the aluminum alloy described above.
• the application of the aluminum alloy on the radiator can effectively improve the heat dissipation effect of the radiator, and ensures that the radiator has good mechanical properties and can meet the various requirements of the die casting process.
• Example 1 Si Mg Fe Sr B Zn Cu Mn Cr Ga Mo Inevitable impurities and Al
• Example 1 10 0.07 0.6 0.015 0.01 0.02 0.05 0.07 0.002 0.018 0.003 Other impurities ⁇ 0.1
• Example 2 9.6 0.07 0.6 0.015 0.01 0.02 0.05 0.07 0.002 0.018 0.003 Other impurities ⁇ 0.1
• Example 3 11 0.07 0.6 0.015 0.01 0.02 0.05 0.07 0.002 0.018 0.003 Other impurities ⁇ 0.1
• Example 4 10 0.06 0.6 0.015 0.01 0.02 0.05 0.07 0.002 0.018 0.003 Other impurities ⁇ 0.1
• Example 5 10 0.08 4 0.6 0.015 0.01 0.02 0.05 0.07 0.002 0.018 0.003 Other impurities ⁇ 0.1
• Example 6 9.5 0.07 0.5 0.015 0.01 0.02 0.05 0.05 0.002 0.018 0.003 Other impurities ⁇ 0.1
• This example is used to describe the aluminum alloy and the preparation method thereof disclosed in the present disclosure, including the following steps.
• the composition of the aluminum alloy is as follows in percentages by weight: The content of Si is 10%, the content of Mg is 0.05%, the content of Fe is 0.6%, the content of Sr is 0.015%, the content of B is 0.01%, the content of Zn is 0.02%, the content of Cu is 0.05%, the content of Mn is 0.07%, the content of Cr is 0.002%, the content of Ga is 0.02%, the content of Mo is 0.003%, and the balance is Al and inevitable impurities, where the content of the inevitable impurities is less than 0.1%. Weights of various intermediate alloys or elemental metals required were calculated according to the percentages by weight of the components of the aluminum alloy.
• the intermediate alloys or elemental metals were added to a smelting furnace for smelting.
• a slag removal agent was added to the molten metal for slag removal.
• a refining agent was added to the molten metal for refinement and degassing, followed by casting to obtain an aluminum alloy ingot.
• Examples 2-36 are used to describe the aluminum alloy and the preparation method thereof disclosed in the present disclosure, and include most of the operations in Example 1. Differences are as follows: Based on the aluminum alloy compositions corresponding to the Examples 2-36 shown in Table 1, weights of various intermediate alloys or elemental metals required were calculated according to the percentages by weight of the components of the aluminum alloy. Then the intermediate alloys or elemental metals were added to a smelting furnace for smelting. A slag removal agent was added to the molten metal for slag removal. A refining agent was added to the molten metal for refinement and degassing, followed by casting to obtain an aluminum alloy ingot.
• This comparative example is used to describe the aluminum alloy and the preparation method thereof disclosed in the present disclosure through comparison, including the following operations.
• the composition of the aluminum alloy is as follows in percentages by weight: The content of Si is 10%, the content of Mg is 0.07%, the content of Fe is 0.6%, the content of Sr is 0.015%, the content of B is 0.01%, the content of Zn is 0.02%, the content of Cu is 0.05%, the content of Mn is 0.07%, the content of Cr is 0.002%, the content of Ga is 0.018%, the content of Mo is 0.003%, and the balance is Al and inevitable impurities, where the content of the inevitable impurities is less than 0.1%. Weights of various intermediate alloys or elemental metals required were calculated according to the percentages by weight of the components of the aluminum alloy.
• the intermediate alloys or elemental metals were added to a smelting furnace for smelting.
• a slag removal agent was added to the molten metal for slag removal.
• a refining agent was added to the molten metal for refinement and degassing, followed by casting to obtain an aluminum alloy ingot.
• Comparative Examples 2-19 are used to describe the aluminum alloy and the preparation method thereof disclosed in the present disclosure through comparison, and include most of the operations in Example 1. Differences are as follows: Based on the aluminum alloy compositions corresponding to the Comparative Examples 2-19 shown in Table 1, weights of various intermediate alloys or elemental metals required were calculated according to the percentages by weight of the components of the aluminum alloy. Then the intermediate alloys or elemental metals were added to a smelting furnace for smelting. A slag removal agent was added to the molten metal for slag removal. A refining agent was added to the molten metal for refinement and degassing, followed by casting to obtain an aluminum alloy ingot.
• the aluminum alloy was made into a cast thermally conductive round sheet of ⁇ 12.7*3 mm. A graphite coating is uniformly sprayed on both sides of the sample to be tested.
• the treated sample was placed into a laser flash apparatus for testing. A laser thermal conductivity test was carried out in accordance with ASTM E1461 "Standard Test Method for Thermal Diffusivity of Solids by the Flash Method".
• the aluminum alloys prepared in Examples 1-36 and Comparative Examples 1-19 were subjected to artificial aging treatment at 320°C for 3 h. The above performance tests were carried out on the aluminum alloys after the artificial aging treatment.
• Example 1 143 296 11.25 175 117 240 13.68 198
• Example 2 147 294 11.5 173 107 236 12.6 195
• Example 3 144 288 12.04 172 118 240 13.5 198.4
• Example 4 141 284 14.52 172 110 228 13.89 195
• Example 5 144 285 9.7 170 117 229 14 194
• Example 6 140 297 10.32 170 116 238 11.95 194
• Example 7 150 299 11.02 173 118 241 12.93
• Example 8 140 296 11.31 170 109 237 13.1 193
• Example 9 148 294 11.95 174 116 239 12.1 196
• Example 10 141 296 11.31 173 110 2
• the aluminum alloy provided in the present disclosure has better mechanical strength, can meet the requirements of the die casting process, and has a better thermal conductivity, elongation rate, and die-casting formability.
• the aluminum alloy provided in the present disclosure has an excellent thermal conductivity and is especially suitable for use in heat dissipation materials.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• General Engineering & Computer Science (AREA)
• Continuous Casting (AREA)
• Conductive Materials (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=78924453

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (3)

Family Cites Families (16)

• 2020
  • 2020-06-18 CN CN202010557444.0A patent/CN113817938B/zh active Active
• 2021
  • 2021-06-02 EP EP21826605.4A patent/EP4170051A4/fr active Pending
  • 2021-06-02 WO PCT/CN2021/097984 patent/WO2021254154A1/fr not_active Ceased

Also Published As

Similar Documents

Legal Events