Aluminum alloy, box body, electronic equipment and manufacturing method

Abstract

The invention provides an aluminum alloy, a box body, electronic equipment and a manufacturing method, and the aluminum alloy can comprise the following components in percentage by mass: 0.5%-15% of lanthanum, 0.5%-15% of cerium, 0.05%-3% of iron, 0.001%-0.590% of manganese, 0.01%-5% of titanium diboride, more than or equal to 80% of aluminum and less than or equal to 0.30% of inevitable impurities. By adding lanthanum and cerium, the aluminum alloy can have a high melting point, and the corrosion resistance of the aluminum alloy can be improved; by adding titanium diboride, the defect that the mechanical property of the aluminum alloy after die-casting forming and high-temperature brazing is limited due to the fact that only lanthanum, cerium, iron and manganese are added can be overcome; the die-casting forming effect can be improved by adding iron and manganese; therefore, the obtained aluminum alloy has a higher melting point, can be used for high-temperature brazing, and also has better mechanical property, corrosion resistance and die-casting forming effect.

Description

Technical Field

[0001] The present application relates to the technical field of aluminum alloys, and in particular to an aluminum alloy, a box, an electronic device, and a manufacturing method. Background Art

[0002] Brazing is a welding method in which the solder and the workpiece are heated to the melting point of the solder at the same time, and the gap between the solid workpieces is filled with liquid solder to connect the metals. Aluminum alloys are widely used as raw materials for structural parts in the fields of communications, automobiles, consumer electronics, etc. due to their good thermal conductivity, high strength, lightness and affordability.

[0003] The aluminum alloys commonly used in aluminum alloy castings are generally Al-Si alloys, and the melting point of Al-Si alloys is relatively low. For example, the melting point of the commonly used Al-Si alloy with the grade ADC12 is 516°C, and the melting point of the Al-Si alloy with the grade ADC10 is 538°C. The temperature of high-temperature brazing is usually around 600°C. Therefore, aluminum alloy castings made of Al-Si alloys will melt during high-temperature brazing, making it impossible to achieve high-temperature brazing of aluminum alloy castings. Summary of the invention

[0004] The present application provides an aluminum alloy, a housing, an electronic device and a manufacturing method to obtain an aluminum alloy with a relatively high melting point, so that the aluminum alloy can be suitable for high-temperature brazing.

[0005] In a first aspect, an embodiment of the present application provides an aluminum alloy, which may include, by mass percentage, lanthanum: 0.5% to 15%, cerium: 0.5% to 15%, iron: 0.05% to 3%, manganese: 0.001% to 0.590%, titanium diboride: 0.01% to 5%, aluminum: ≥80%, and unavoidable impurities ≤0.3%. Among them, aluminum has the largest mass percentage in the entire aluminum alloy and is the main component in the aluminum alloy, and other elements are alloying elements, so the mass percentages of other elements are relatively small compared to the mass percentage of aluminum.

[0006] Among them, for the added lanthanum and cerium: by adding 0.5% to 15% by mass of lanthanum, the eutectic temperature of aluminum-lanthanum is above 640°C, and by adding 0.5% to 15% by mass of cerium, the eutectic temperature of aluminum-cerium alloy is above 640°C, so that the aluminum alloy added with lanthanum and cerium has a higher melting point, and the melting point of this aluminum alloy can reach above 630°C. When the temperature of high-temperature brazing is about 600°C, the melting point of this aluminum alloy is higher than the temperature during high-temperature brazing, so this aluminum alloy will not melt during high-temperature brazing and can be suitable for high-temperature brazing. Moreover, the standard electrode potential of lanthanum is about -2.379V, the standard electrode potential of cerium is about -2.336V, and the standard electrode potential of aluminum is about -1.66V. Obviously, the ability of lanthanum and cerium to lose electrons is higher than that of aluminum. Therefore, when corrosion occurs, lanthanum and cerium are corroded first, while aluminum is less likely to be corroded. Therefore, the introduction of lanthanum and cerium protects aluminum and improves the corrosion resistance of aluminum alloy. In addition, during the solidification and cooling stage of the molten metal during die casting, the introduced lanthanum and cerium can form intermetallic compound second phase particles with aluminum, such as Al 11 (La, Ce)3, this intermetallic compound second phase particle can be called self-generated second phase particle, and these intermetallic compound second phase particles can increase the number of crystal nuclei in aluminum alloy as heterogeneous crystal nuclei. In the process of crystal nucleus growth, various crystal nuclei collide with each other and inhibit grain growth, thus refining the grains. Since the intermetallic compound second phase particles are only produced during the solidification and cooling stage of the molten metal during die casting, before the solidification and cooling stage of the molten metal during die casting, the heterogeneous crystal nuclei cannot play a role in refining the grains due to the absence of these intermetallic compound second phase particles. Therefore, the addition of lanthanum and cerium can improve the mechanical properties of aluminum alloy after die casting to a certain extent, but the degree of improvement is limited.

[0007] For added iron: by adding 0.05% to 3% by mass of iron, during the solidification and cooling stage of the molten metal during die casting, iron can also form intermetallic compound second phase particles in the aluminum liquid, such as (La, Ce)Fe2Al 10 , this intermetallic compound second phase particles can also be called self-generated second phase particles. In the die-casting process of aluminum alloy, these intermetallic compound second phase particles can also play the role of refining grains (including aluminum grains and other intermetallic compound second phase particles) as heterogeneous crystal nuclei. Also, since these intermetallic compound second phase particles are generated during the solidification and cooling stage of the molten metal during die-casting, they can also improve the mechanical properties of aluminum alloy to a certain extent, but the degree of improvement is limited. In addition, the added iron can reduce the adhesion of aluminum alloy to steel molds during die-casting, reduce mold sticking, and improve the demolding effect of aluminum alloy, thereby improving the die-casting effect.

[0008] For the added manganese: the added manganese of 0.001% to 0.590% by mass is less than the solid solubility of manganese in aluminum (i.e. 1.25%), so most of the added manganese can be dissolved in aluminum, playing a role of solid solution strengthening. In addition, manganese can transform the flaky iron-containing intermetallic compound second phase particles into fine spherical intermetallic compound second phase particles, thereby improving the strengthening effect of the iron-containing intermetallic compound second phase particles, so that under the action of manganese, the strengthening effect of iron on the mechanical properties of aluminum alloy can be increased. In addition, because the solidification point temperature of manganese aluminum is about 658°C, and the solidification point temperature of aluminum is about 660°C, the addition of manganese has little effect on the melting point of aluminum alloy. In addition, the atomic radius of manganese and iron is similar, so the combination of manganese and iron can further reduce the tendency of castings to stick to steel molds, thereby improving the die casting molding effect.

[0009] For titanium diboride: by adding 0.01% to 5% mass fraction of titanium diboride, titanium diboride has good wettability with aluminum and is resistant to high temperatures, so the added titanium diboride itself can serve as a heterogeneous nucleus, and the heterogeneous nucleus already exists in the initial stage of die casting, so titanium diboride can play the role of refining the grains of heterogeneous nuclei in the initial stage of die casting. Compared with lanthanum, cerium and iron, it plays the role of blocking grain growth earlier and longer. From the casting point of view, it can effectively improve the mechanical properties of aluminum alloy after die casting. During high-temperature brazing, titanium diboride can block grain growth again as a reinforcing particle, and can also play the role of refining grains. At the same time, the added titanium diboride itself can hinder dislocation movement and play a strengthening role. Therefore, by adding titanium diboride, the mechanical properties after die casting and high-temperature brazing can be effectively improved on the basis of making the aluminum alloy have a higher melting point. Moreover, titanium diboride, as an added heterogeneous crystal nucleus, can also improve the flowability and shrinkage compensation ability of the aluminum alloy during die casting, thereby improving the effect of die casting. In addition, the elastic modulus of titanium diboride is relatively high, about 599GPa, while the elastic modulus of aluminum is 70GPa, so by adding titanium diboride, the elastic modulus of aluminum alloy can be effectively improved, thereby improving the rigidity of aluminum alloy castings.

[0010] It is further explained that the addition of lanthanum, cerium, iron and manganese can improve the mechanical properties of aluminum alloys after die-casting and high-temperature brazing to a certain extent, but the application scenarios of this aluminum alloy are limited. For example, if the aluminum alloy is applied to a scene with relatively high requirements for mechanical properties, such as outdoor scenes, the mechanical properties of the aluminum alloy obtained by adding lanthanum, cerium, iron and manganese cannot meet the requirements for outdoor mechanical properties. Adding titanium diboride on the basis of lanthanum, cerium, iron and manganese can significantly improve the mechanical properties of the aluminum alloy and meet the requirements for outdoor mechanical properties, so that this aluminum alloy can be applied to scenes with relatively high requirements for mechanical properties, broadening the application range of aluminum alloys.

[0011] In short, by adding titanium diboride, the disadvantage of limited mechanical properties of aluminum alloy after die casting and high-temperature brazing due to only adding lanthanum, cerium, iron and manganese can be improved, and the added titanium diboride can also play a composite reinforcement role together with various other self-generated intermetallic compound second phase particles, so that the obtained aluminum alloy has a higher melting point, can be used for high-temperature brazing, and also has good mechanical properties, corrosion resistance, and die casting effect.

[0012] It should be understood that the aluminum alloy of the embodiment of the present application has a base material of aluminum, and the sum of the mass percentages of the various components is 100% by mass percentage. Among them, the inevitable impurities may include impurities introduced by the raw materials of each component and impurities introduced by various production equipment and tooling during the preparation process, such as but not limited to one or a combination of at least two of silicon, chromium, nickel, beryllium, calcium, cobalt, vanadium, tin, lead, etc. In order not to affect the final performance of the aluminum alloy, the content of inevitable impurities needs to be controlled below 0.3%, and can be further controlled below 0.15%. For example, the content of the impurities finally introduced can be controlled by controlling the purity of the raw materials and the cleanliness of the equipment during the preparation process.

[0013] Exemplarily, after high-temperature brazing, the aluminum alloy containing the above components has a thermal conductivity ≥100W / (m·K), an elastic modulus>70GPa, a yield strength ≥60MPa, and a tensile strength ≥130MPa, indicating that the aluminum alloy has high thermal conductivity, good elastic modulus, and good mechanical properties even after high-temperature brazing. This further indicates that when the aluminum alloy is brazed at high temperature, the brazing material can better wet and fill the gap between the aluminum alloy castings to be brazed, not only filling the gap better, but also better connecting the aluminum alloy castings, so that the welded structure has better strength, and when screws are driven into the welded structure, the problem of screw slippage can be avoided, making the welded structure more reliable.

[0014] In one embodiment of the present application, the aluminum alloy includes the following components in mass percentage: lanthanum: 2% to 5%, cerium: 4% to 9%, iron: 0.5% to 2%, manganese: 0.001% to 0.4%, titanium diboride: 0.1% to 2%, aluminum: ≥85%, and inevitable impurities ≤0.3%. In another embodiment of the present application, the aluminum alloy includes the following components in mass percentage: lanthanum: 3% to 4%, cerium: 5.5% to 7.5%, iron: 1.0% to 1.5%, manganese: 0.001% to 0.2%, titanium diboride: 0.3% to 0.7%, aluminum: ≥85%, and inevitable impurities ≤0.3%. By optimizing the components of the aluminum alloy, the aluminum alloy can have a higher melting point and better mechanical properties, corrosion resistance and die-casting effect.

[0015] In one embodiment of the present application, the aluminum alloy may further include less than or equal to 1% zirconium by mass percentage, and the zirconium content may be optimized to 0.05% to 0.25%. By adding zirconium, zirconium as a heterogeneous crystal nucleus can promote the formation of a large number of second phase particles, which plays a role in refining grains during the die-casting process of the aluminum alloy, thereby further improving the mechanical properties of the aluminum alloy after die-casting and high-temperature brazing.

[0016] In terms of mass percentage, the aluminum alloy can also include less than or equal to 3% yttrium, and the yttrium content can be optimized to 0.5% to 2.5%. Yttrium, lanthanum and cerium are all rare earth elements, so yttrium can also form a large number of second phase particles with aluminum, such as Al3Y. These second phase particles can also play a role in refining grains as heterogeneous crystal nuclei, further improving the mechanical properties of aluminum alloy after die casting and high temperature brazing.

[0017] The aluminum alloy may also include less than or equal to 3% zinc by mass percentage, and the zinc content may be optimized to 1.5% to 2.5%. By adding zinc, zinc as an alloying element added to aluminum, it can have a solid solution strengthening effect, thereby improving the mechanical properties of the aluminum alloy, and can also avoid the reduction of the thermal conductivity of the aluminum alloy, so that the aluminum alloy has a higher thermal conductivity while having better mechanical properties.

[0018] In terms of mass percentage, the aluminum alloy may also include less than or equal to 3% samarium, and the content of samarium can be optimized to 0.5% to 2.5%. Samarium, lanthanum and cerium are all rare earth elements, which can form a large number of differentiated second phase particles with aluminum, such as Al3Sm. These second phase particles can also play a role in refining grains as heterogeneous crystal nuclei, improving the mechanical properties of aluminum alloy after die casting and high temperature brazing.

[0019] The aluminum alloy may also include less than or equal to 2% magnesium by mass, and the magnesium content may be optimized to 0.2% to 0.5%. By adding magnesium, magnesium, as an element added to aluminum, can have a solid solution strengthening effect, thereby improving the mechanical properties and corrosion resistance of the aluminum alloy.

[0020] In short, by adding and optimizing the content of zirconium, yttrium, zinc, samarium and magnesium, the solid solution strengthening effect and particle strengthening effect of the alloying elements can be optimized to further improve the mechanical properties of the aluminum alloy, and the aluminum alloy can also have a higher thermal conductivity. Of course, in addition to the various substances listed above, the aluminum alloy in the embodiment of the present application can also include other metal elements, such as but not limited to nickel, etc., which can be selected according to actual conditions and are not limited here.

[0021] In the second aspect, the embodiment of the present application also provides a method for making an aluminum alloy casting, which may include: performing slag removal and degassing treatment on the alloy melt; wherein the components contained in the alloy melt are consistent with the components of the aluminum alloy introduced in the first aspect above; and liquid casting the alloy melt after the slag removal and degassing treatment to obtain an aluminum alloy casting. In this way, an aluminum alloy casting with a specific component can be produced, and the produced aluminum alloy casting has a higher melting point, can be used for high-temperature brazing, and also has good mechanical properties, corrosion resistance and die-casting effect.

[0022] The alloy melt can be prepared by the following process: first, clean the surface of the pure aluminum ingot and then smelt it to obtain aluminum liquid; then add various components to be added (including lanthanum, cerium, iron, titanium diboride, zirconium, yttrium, zinc, samarium, manganese and magnesium) to the aluminum liquid, and heat it to a certain temperature so that all components can be melted, thereby obtaining an alloy melt. Of course, in addition to smelting the pure aluminum ingot first and then melting other components, the pure aluminum ingot and various components can also be added together and then heated to obtain an alloy melt, as long as the raw materials weighed according to the components of the aluminum alloy can be mixed and melted, and the order of adding the raw materials is not limited here. In addition, aluminum can be introduced into the alloy melt in the form of pure aluminum ingots, lanthanum and cerium can be introduced into the alloy melt in the form of an intermediate alloy formed by aluminum, lanthanum and cerium (which can be simply referred to as Al-(La, Ce) intermediate alloy), iron can be introduced into the alloy melt in the form of an intermediate alloy formed by aluminum and iron (which can be simply referred to as Al-Fe intermediate alloy), zirconium can be introduced into the alloy melt in the form of an intermediate alloy formed by aluminum and zirconium (which can be simply referred to as Al-Zr intermediate alloy), yttrium can be introduced into the alloy melt in the form of an intermediate alloy formed by aluminum and yttrium (which can be simply referred to as Al-Y intermediate alloy), titanium diboride can be introduced into the alloy melt in the form of an intermediate alloy formed by aluminum and titanium diboride (which can be simply referred to as Al-TiB2 intermediate alloy), samarium is introduced into the alloy melt in the form of an intermediate alloy formed by aluminum and samarium (which can be simply referred to as Al-Sm intermediate alloy), manganese is introduced into the alloy melt in the form of an intermediate alloy formed by aluminum and manganese (which can be simply referred to as Al-Mn intermediate alloy), and magnesium is introduced into the alloy melt in the form of a pure magnesium ingot. Of course, in addition to the fact that lanthanum, cerium, iron, titanium diboride, zirconium, yttrium, samarium, manganese and magnesium can be introduced into the alloy melt in the form of corresponding intermediate alloys formed with aluminum, it can also be set as follows: some of lanthanum, cerium, iron, titanium diboride, zirconium, yttrium, samarium, manganese and magnesium can be introduced into the alloy melt in the form of corresponding intermediate alloys formed with aluminum. Since the cost of Al-(La, Ce) intermediate alloy is lower than that of pure Al-La intermediate alloy and pure Al-Ce intermediate alloy, the introduction of lanthanum and cerium at the same time in the form of mixed rare earth intermediate alloy can reduce the raw materials and production costs of aluminum alloy castings, thereby achieving cost reduction and efficiency improvement.

[0023] For example, in the Al-(La, Ce) master alloy, the mixing ratio of lanthanum to cerium can be 30:70 to 50:50. Under different mixing ratios of lanthanum and cerium, the aluminum alloy casting can have different mechanical properties. In this way, according to the mechanical property requirements of the aluminum alloy casting, the production cost and other factors, the appropriate mixing ratio of lanthanum and cerium can be selected to meet the application requirements of the aluminum alloy casting in various scenarios and improve the flexibility of the design. For example, in order to minimize the production cost of the aluminum alloy casting including the above components, the mixing ratio of lanthanum to cerium can be 35:65.

[0024] When the alloy melt is subjected to slag removal and degassing treatment, the following process can be specifically included: adding a refining agent to the alloy melt, using a rotary degasser, refining and degassing the alloy melt with the refining agent added, deslagging after a preset refining and degassing time, standing for a period of time, and then using a hydrogen meter to detect the hydrogen content in the alloy melt after standing, and judging whether the hydrogen content is greater than a threshold value, if greater than, indicating that the hydrogen content in the alloy melt is still high, and further slag removal and degassing treatment is required, so the above slag removal and degassing process is continued; if not greater than, indicating that the hydrogen content in the alloy melt has met the requirements, it can be determined that the slag removal and degassing are completed at this time, and the die casting process can be performed. Among them, the threshold value can be designed according to factors such as the influence of hydrogen content on aluminum alloy castings and the performance requirements of aluminum alloy castings, which are not limited here, for example but not limited to the threshold value is set to not more than 0.3ml / 100g, and the threshold value can be further optimized to 0.2ml / 100g, at which time the hydrogen content in the alloy melt is less than or equal to 0.2ml / 100g. And the type of refining agent can be selected according to the actual situation, for example but not limited to the selection of sodium-free refining agent, which is not limited here. It should be understood that when making alloy melt, the solubility of hydrogen in the alloy melt is high under high temperature conditions, making hydrogen very soluble in liquid aluminum. During the die-casting process, as the temperature of the alloy melt decreases, the solubility of hydrogen decreases, causing hydrogen to gradually precipitate. If degassing is not performed before die-casting, defects such as pores and pinholes will be generated in the aluminum alloy casting. These defects will cause the surface of the aluminum alloy casting to bubble during high-temperature brazing. Therefore, after slag removal and degassing treatment, the bubbling phenomenon of the aluminum alloy casting after high-temperature brazing can be reduced, so that the bubbling height after high-temperature brazing does not exceed 0.5mm. By further optimizing the threshold, the bubbling height after high-temperature brazing can be further reduced to within 0.2mm or no bubbling phenomenon.

[0025] In addition, when performing die casting, it can be performed under a vacuum environment, thereby realizing vacuum die casting. The vacuum degree used in vacuum die casting can be less than or equal to 100 mbar, and can be further optimized to be less than or equal to 50 mbar, and can be further optimized to be less than or equal to 30 mbar. By optimizing the vacuum degree, the die casting effect during vacuum die casting can be improved, and the gas contained in the aluminum alloy casting can be reduced, thereby further improving the mechanical properties of the aluminum alloy casting. Moreover, by optimizing the vacuum degree, the bubbling phenomenon of the aluminum alloy casting after high-temperature brazing after die casting and the fluidity of the alloy melt can be further reduced.

[0026] It should be understood that since the composition of the alloy melt in this production method is consistent with the composition of the aluminum alloy introduced in the first aspect above, the explanation of the composition of the alloy melt can refer to the implementation and technical effects of the aluminum alloy in the first aspect above, and the repeated parts will not be repeated.

[0027] In a third aspect, the embodiment of the present application further provides a box, which may include an aluminum alloy casting, and the material of the aluminum alloy casting may include the aluminum alloy introduced in the first aspect. Since the aluminum alloy has good mechanical properties and corrosion resistance, the box formed based on the aluminum alloy casting also has good mechanical properties and corrosion resistance.

[0028] It should be understood that since the principle of solving the problem by the box is similar to the principle of solving the problem by the aluminum alloy in the first aspect mentioned above, the implementation and technical effects of the box can refer to the implementation and technical effects of the aluminum alloy mentioned above, and the repeated parts will not be repeated.

[0029] In a fourth aspect, the embodiment of the present application further provides a method for manufacturing a box, which may include: using the manufacturing method described in the second aspect to manufacture an aluminum alloy casting, and performing high-temperature brazing on the aluminum alloy casting. In this way, since the manufactured aluminum alloy casting has a high melting point, high-temperature brazing technology can be used when manufacturing the box through the aluminum alloy casting, so that it is suitable for the field of high-temperature brazing. And because the aluminum alloy casting also has good mechanical properties and corrosion resistance, the box based on the aluminum alloy casting also has good mechanical properties and corrosion resistance.

[0030] For example, when high-temperature brazing is performed on aluminum alloy castings, the aluminum alloy castings and the brazing material composite plate may be welded together by high-temperature brazing, or the aluminum alloy castings may be welded together, which is not limited here. When welding the aluminum alloy castings together, a brazing material sheet may be placed between the two aluminum alloy castings before welding to achieve high-temperature brazing.

[0031] It should be understood that since the principle of solving the problem by the box body is similar to the principle of solving the problem by the method for manufacturing aluminum alloy castings in the second aspect mentioned above, the implementation and technical effects of the box body can refer to the implementation and technical effects of the method for manufacturing aluminum alloy castings mentioned above, and the repeated parts will not be repeated.

[0032] In a fifth aspect, an embodiment of the present application further provides an electronic device, which may include: a processing unit, and a housing as described in the third aspect above, wherein the processing unit is located in the housing. In this way, when the housing has good mechanical properties and corrosion resistance, the housing can better protect the internal processing unit, thereby preventing the processing unit from being damaged due to corrosion of the housing when the electronic device is placed outdoors for a long time as a communication device, thereby improving the reliability of the electronic device. In addition, the housing can also play a role in heat dissipation, so as to avoid damage caused by excessive temperature of the internal processing unit, thereby further improving the reliability of the electronic device.

[0033] It should be understood that since the principle of solving the problem by the electronic device is similar to the principle of solving the problem by the box in the third aspect mentioned above, the implementation and technical effects of the electronic device can refer to the implementation and technical effects of the box mentioned above, and the repeated parts will not be repeated. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the structure of a portion of a box provided in an embodiment of the present application;

[0035] Figure 2 A flowchart of a method for manufacturing an aluminum alloy casting provided in an embodiment of the present application;

[0036] Figure 3 A microscopic morphology of an aluminum alloy casting provided in an embodiment of the present application;

[0037] Figure 4 A die-casting effect diagram provided in an embodiment of the present application;

[0038] Figure 5 A schematic diagram of a casting after brazing provided in an embodiment of the present application;

[0039] Figure 6 A weld structure diagram of an aluminum alloy casting after high-temperature brazing provided in an embodiment of the present application;

[0040] Figure 7 A schematic diagram of the tensile strength of an aluminum alloy casting after high-temperature brazing provided in an embodiment of the present application;

[0041] Figure 8 This is a welding effect diagram of the aluminum alloy casting provided in the embodiment of the present application after high temperature brazing;

[0042] Fig. 9This is a diagram showing the corrosion resistance of the aluminum alloy casting provided in an embodiment of the present application after high-temperature brazing. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0044] It should be noted that the same reference numerals in the drawings of this application represent the same or similar structures, and thus their repeated description will be omitted. The words expressing positions and directions described in this application are all explained using the drawings as examples, but they can be changed as needed, and the changes are included in the protection scope of this application. The drawings of this application are only used to illustrate the relative position relationship and do not represent the true proportion.

[0045] In order to facilitate understanding of the technical solution provided by the embodiments of the present application, its application scenario is first described below.

[0046] Aluminum alloy can be widely used in the housings of various electronic devices, such as but not limited to communication equipment, such as large-scale multi-receive and multi-transmit systems, radio frequency remote units, active antenna processing units, etc. Of course, in addition to communication equipment, electronic equipment can also include electronic computers, numerical control equipment, program control equipment, vehicle-mounted thermal circulation boxes, vehicle machine cooling boxes, etc., which are not listed here one by one.

[0047] Exemplarily, the electronic device may include: a housing and a processing unit located in the housing. The processing unit may be any unit with processing functions in the electronic device, such as a processor, a processing circuit, etc. The housing may be welded by at least two aluminum alloy castings. When welding the aluminum alloy castings, high-temperature brazing may be used. This requires ensuring that the melting point of the aluminum alloy castings is higher than the temperature used for high-temperature brazing. If the melting point of the aluminum alloy castings is lower than the temperature used for high-temperature brazing, the aluminum alloy castings will melt during high-temperature brazing and the desired housing cannot be obtained. Usually, the temperature used for high-temperature brazing is about 600°C, and the commonly used aluminum alloy castings are generally Al-Si alloys. The melting point of Al-Si alloys is relatively low, about 577°C. Obviously, the melting point of Al-Si alloys is lower than the temperature used for high-temperature brazing, so aluminum alloy castings made of Al-Si alloys cannot be used in the field of high-temperature brazing.

[0048] Based on this, the present application provides an aluminum alloy, which has a higher melting point and can be suitable for high-temperature brazing.

[0049] Figure 1 The schematic diagram of the structure when the aluminum alloy casting is used in the box is shown as an example. Figure 1As shown, (c) shows a part of a box body formed by two structures after high-temperature brazing, wherein one of the structures is an aluminum alloy casting 10 (as shown in (b)), the aluminum alloy casting 10 has a frame a1, a bottom plate a2, and an island structure a3 arranged on the bottom plate a2, part of the island structure a3 is connected to the frame a1, and the island structure a3 is arranged in the space surrounded by the frame a1 and the bottom plate a2; the other structure is a solder composite plate 20 (as shown in (a)), the solder composite plate 20 is a flat plate structure with a certain thickness, and solder is arranged on one side surface of the solder composite plate 20 (not shown in (a)); when the solder composite plate 20 is placed on the aluminum alloy casting 10 When soldering, it is necessary to make the surface of one side of the solder composite plate 20 with the solder in contact with the aluminum alloy casting 10, and then make the solder on the surface of the solder composite plate 20 contact with the frame a1 of the aluminum alloy casting 10 and the island structure a3 of the aluminum alloy casting 10 respectively. After high-temperature brazing, the two castings are welded together through the island structure a3 and the frame a1, and the areas in the two castings except the island structure a3 form a cavity. If the structure formed by the two castings is used for heat dissipation, refrigerant can be injected into the cavity in the two castings through the injection pipe 30 arranged on the solder composite plate 20, so that the refrigerant can evaporate, cool, and circulate in the cavity, thereby taking away heat and realizing the heat dissipation function. Of course, the solder composite plate 20 is not limited to a flat plate structure, but can also have the same structure as the aluminum alloy casting 10. When the solder composite plate 20 is buckled onto the aluminum alloy casting 10, the island structure a3 of the aluminum alloy casting 10 is in contact with the island structure a3 of the solder composite plate 20, and the frame a1 of the aluminum alloy casting 10 is in contact with the frame a1 of the solder composite plate 20. In addition, solder can be arranged between the island structure a3 of the aluminum alloy casting 10 and the island structure a3 of the solder composite plate 20, and between the frame a1 of the aluminum alloy casting 10 and the frame a1 of the solder composite plate 20, so as to facilitate high-temperature brazing.

[0050] It should be understood that the structure of the aluminum alloy casting is not limited to Figure 1 As shown, other shapes can also be set according to factors such as actual application scenarios and usage purposes, which are not limited here.

[0051] The aluminum alloy provided in the embodiments of the present application is explained and illustrated below.

[0052] An aluminum alloy provided in an embodiment of the present application may include, by mass percentage, lanthanum: 0.5% to 15%, cerium: 0.5% to 15%, iron: 0.05% to 3%, manganese: 0.001% to 0.590%, titanium diboride: 0.01% to 5%, aluminum: ≥80%, and unavoidable impurities ≤0.3%. In this way, by adding titanium diboride, the disadvantage of limited mechanical properties of the aluminum alloy after die casting and high-temperature brazing due to the addition of only lanthanum, cerium, iron and manganese can be improved, and the added titanium diboride can also play a role of composite reinforcement together with various other self-generated second phase particles, so that the obtained aluminum alloy has a higher melting point, can be used for high-temperature brazing, and also has good mechanical properties, corrosion resistance and die casting effect.

[0053] Exemplarily, after high-temperature brazing, the aluminum alloy containing the above components has a thermal conductivity ≥100W / (m·K), an elastic modulus>70GPa, a yield strength ≥60MPa, and a tensile strength ≥130MPa, indicating that the aluminum alloy has high thermal conductivity, good elastic modulus, and good mechanical properties even after high-temperature brazing. This further indicates that when the aluminum alloy is brazed at high temperature, the brazing material can better wet and fill the gap between the aluminum alloy castings to be brazed, not only filling the gap better, but also better connecting the aluminum alloy castings, so that the welded structure has better strength, and when screws are driven into the welded structure, the problem of screw slippage can be avoided, making the welded structure more reliable.

[0054] Among them, the mass proportion of lanthanum added to the aluminum alloy can be, for example but not limited to: 0.15%, 2%, 3%, 3.5%, 4%, 5%, 8%, 10%, 15%, etc.; the mass proportion of cerium added to the aluminum alloy can be, for example but not limited to: 0.5%, 4%, 5.5%, 6.5%, 7.5%, 9%, 12%, 15%, etc. And, the mixing ratio of lanthanum and cerium in the aluminum alloy can be, for example but not limited to: 30:70, 35:65, 40:60 or 50:50. In this way, by adjusting the mass proportion of lanthanum, the mass proportion of cerium, and the mixing ratio of lanthanum and cerium, not only the melting point of the aluminum alloy can be adjusted, but also the aluminum alloy can have different mechanical properties and different production costs at different mixing ratios of lanthanum and cerium. In this way, according to the mechanical property requirements of aluminum alloy castings, production costs and other factors, the appropriate mixing ratio of lanthanum and cerium can be selected to meet the application requirements of aluminum alloys in various scenarios and improve the flexibility of design.

[0055] The mass percentage of iron added to the aluminum alloy can be, for example but not limited to: 0.05%, 0.5%, 1%, 1.2%, 1.5%, 2%, 3%, etc. Therefore, by controlling the amount of iron added, the mechanical properties and die-casting effect of the aluminum alloy can be improved. For example, when the iron content is controlled within the range of 0.5% to 2%, and further controlled within the range of 1.0% to 1.5%, the comprehensive effect obtained is better.

[0056] The mass percentage of manganese added to the aluminum alloy can be, for example but not limited to: 0.001%, 0.01%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, etc. Therefore, by controlling the amount of manganese added, the mechanical properties and die-casting effect of the aluminum alloy can be improved. For example, when the manganese content is controlled within the range of 0.001% to 0.4%, and further controlled within 0.001% to 0.2%, the comprehensive effect obtained is better.

[0057] The mass proportion of titanium diboride added to the aluminum alloy can be, for example but not limited to: 0.01%, 0.1%, 0.3%, 0.5%, 0.7%, 2%, 3.5%, 5%, etc. Therefore, by controlling the addition amount of titanium diboride, the mechanical properties and die-casting effect of the aluminum alloy can be improved. Exemplarily, when the titanium diboride content is controlled within the range of 0.1% to 2%, and further controlled within the range of 0.3% to 0.7%, the comprehensive effect obtained is better.

[0058] Moreover, the aluminum alloy may also include no more than 1% zirconium by mass percentage, which may be further optimized to 0.05% to 0.25%. By controlling the addition amount of zirconium within the above range, the mechanical properties of the aluminum alloy after die casting and high temperature brazing can be improved. Exemplarily, by mass percentage, the mass proportion of zirconium in the aluminum alloy may be, for example but not limited to: 0, 0.05%, 0.015%, 0.2%, 0.25% or 1%.

[0059] By mass percentage, the aluminum alloy may also include no more than 3% yttrium, which may be further optimized to 1.5% to 2.5%. By controlling the addition amount of yttrium within the above range, the mechanical properties of the aluminum alloy after die casting and high temperature brazing can be improved. Exemplarily, by mass percentage, the mass proportion of yttrium in the aluminum alloy may be, for example but not limited to: 0, 1.5%, 2%, 2.5% or 3%.

[0060] By mass percentage, the aluminum alloy may also include no more than 3% zinc, which may be further optimized to 1.5% to 2.5%. By controlling the amount of zinc added within the above range, the mechanical properties and thermal conductivity of the aluminum alloy after die casting and high temperature brazing may be improved. Exemplarily, by mass percentage, the mass proportion of zinc in the aluminum alloy may be, for example but not limited to: 0, 1.5%, 2%, 2.5% or 3%.

[0061] By mass percentage, the aluminum alloy may also include no more than 3% samarium, which may be further optimized to 0.5% to 2.5%. By controlling the addition of samarium within the above range, the mechanical properties of the aluminum alloy after die casting and high temperature brazing can be improved. Exemplarily, by mass percentage, the mass proportion of samarium in the aluminum alloy may be, for example but not limited to: 0, 0.5%, 1%, 1.5%, 2% or 3%. By mass percentage, the aluminum alloy may also include no more than 2% magnesium, which may be further optimized to 0.2% to 0.5%. By controlling the addition of magnesium within the above range, the mechanical properties and corrosion resistance of the aluminum alloy may be improved. Exemplarily, by mass percentage, the mass proportion of magnesium in the aluminum alloy may be, for example but not limited to: 0, 0.3%, 1%, 1.5% or 2%.

[0062] Figure 2 For a flowchart of a method for manufacturing an aluminum alloy casting according to an embodiment of the present application, see Figure 2 As shown, the specific production process may include:

[0063] S201. Weigh the components constituting the aluminum alloy according to mass percentage;

[0064] Among them, the weighed components may include: pure aluminum ingot, Al-(La, Ce) master alloy, Al-Fe master alloy, Al-Zr master alloy, Al-Y master alloy, pure zinc ingot, Al-TiB2 master alloy, Al-Sm master alloy, Al-Mn master alloy, pure magnesium ingot.

[0065] S202, after cleaning the surface of the pure aluminum ingot, putting it into a crucible, melting the pure aluminum ingot to obtain aluminum liquid, and controlling the temperature of the aluminum liquid;

[0066] The temperature of the aluminum liquid can be, but is not limited to, controlled at 710°C to 730°C.

[0067] S203, adding other components except aluminum to the aluminum liquid to obtain an alloy melt;

[0068] Among them, the specific implementation process of S203 may include: when the temperature of the aluminum liquid reaches a certain temperature (for example, but not limited to 720°C), the dried Al-(La, Ce) intermediate alloy, Al-Fe intermediate alloy, Al-Zr intermediate alloy, Al-Y intermediate alloy, pure zinc ingot, Al-TiB2 intermediate alloy, Al-Sm intermediate alloy, Al-Mn intermediate alloy, and pure magnesium ingot are respectively added to the aluminum liquid obtained in S202, and the aluminum liquid added with the pure zinc ingot, pure magnesium ingot and various intermediate alloys is heated to a preset temperature (for example, but not limited to 790°C) so that the added pure zinc ingot and various intermediate alloys are completely melted, and the temperature is kept for a certain time (for example, but not limited to 15 minutes) to obtain an alloy melt.

[0069] Of course, the order of adding the various master alloys, pure zinc ingots, and pure magnesium ingots can be selected according to actual conditions and is not limited here.

[0070] S204, performing slag removal and degassing treatment on the alloy solution;

[0071] Among them, the specific implementation process of S204 may include: when the temperature of the alloy melt is reduced to a certain temperature (for example but not limited to 730°C to 750°C), a refining agent (for example but not limited to a sodium-free refining agent) is added to the alloy melt, and a rotary degasser is used to refine and degas the alloy melt with the refining agent, and the refining and degassing is performed for a certain time (for example but not limited to 10 minutes to 30 minutes), and then the slag is removed and the mixture is allowed to stand (for example but not limited to standing for 1 hour).

[0072] S205, using a hydrogen detector to detect the hydrogen content in the alloy melt, and determine whether the hydrogen content does not exceed 0.3 ml / 100 g, if yes, proceed to the subsequent S206, if not, return to S204;

[0073] S206, performing high vacuum die casting on the alloy melt to obtain an aluminum alloy casting.

[0074] In S206, during high vacuum die casting, the vacuum degree used may be less than or equal to 100 mbar, may be optimized to be less than or equal to 50 mbar, and may be further optimized to be less than or equal to 30 mbar.

[0075] The performance of the aluminum alloy casting of the present application will be described below in conjunction with specific embodiments and comparative examples.

[0076] The following is a comparison of the performance of the aluminum alloy castings produced according to the above steps S201 to S206 when the components have different mass proportions. Among them, the component proportions of the aluminum alloy castings in Examples 1 to 5 are shown in Table 1, and the component proportions of the aluminum alloy castings in Comparative Examples 1 to 3 are shown in Table 2. It should be understood that the raw materials of the above components are only for illustration, but are not limited to the above raw materials. Those skilled in the art can select the required raw materials according to the specific components.

[0077] Table 1

[0078]

[0079] Table 2

[0080] silicon copper iron manganese nickel chromium Comparative Example 1 10％ 2.5％ 1.3％ - - - Comparative Example 2 - - 0.6％ 1.6％ - - Comparative Example 3 - - 1.2％ 1.2％ 3％ 0.4％

[0081] The melting points and mechanical properties (such as yield strength, tensile strength, elastic modulus), and thermal conductivity of the aluminum alloy castings in Examples 1 to 5 and Comparative Examples 1 to 3 were tested respectively, and the test results are listed in Table 3. The yield strength in Table 3 refers to the yield strength of the aluminum alloy casting after high-temperature brazing, the tensile strength in Table 3 refers to the tensile strength of the aluminum alloy casting after high-temperature brazing, the elastic modulus in Table 3 refers to the elastic modulus of the aluminum alloy casting after high-temperature brazing, and the thermal conductivity in Table 3 refers to the thermal conductivity of the aluminum alloy casting after high-temperature brazing.

[0082] The specific testing process of each parameter is as follows:

[0083] Melting point test: Differential Scanning Calorimetry (DSC) test was performed on the cut aluminum alloy casting samples to obtain the melting point.

[0084] Mechanical properties test: According to the requirements of GB / T 228, standard tensile mechanical test pieces were cut from the aluminum alloys of each embodiment and comparative example, and the mechanical properties were tested on a tensile testing machine.

[0085] Thermal conductivity test: laser flash method (ASTM E 1461-01) is used for testing, and the sample size is Φ12.7mm×3mm; specific heat is referred to ISO11357 and ASTM E1269; density is referred to ISO 1183-1:2004.

[0086] Table 3

[0087]

[0088] It can be seen from the data in Table 3 that the comprehensive performance of the aluminum alloy castings corresponding to Examples 1 to 5 of the present application is higher than that of Comparative Examples 1 to 3.

[0089] From the comparison data of Examples 1 to 5 and Comparative Examples 1 to 3, it can be seen that the aluminum alloy castings provided in Examples 1 to 5 of the present application have a melting point of at least 630°C, which is higher than the temperature used for high-temperature brazing (i.e., about 600°C), so the aluminum alloy castings will not melt during high-temperature brazing, so that the aluminum alloy castings can be used for high-temperature brazing. In addition, the yield strength, tensile strength, elastic modulus, and thermal conductivity of Examples 1 to 5 of the present application can meet the requirements of the box in outdoor communication equipment.

[0090] By comparing Example 1 and Example 2, it can be seen that the contents of lanthanum, cerium, iron and manganese in Example 1 and Example 2 are similar, and the content of titanium diboride in the aluminum alloy in Example 1 is significantly higher than the content of titanium diboride in the aluminum alloy in Example 2. At this time, the elastic modulus of Example 1 is 72.7 GPa, and the elastic modulus of Example 2 is 70.4 GPa, and the elastic modulus of Example 1 is significantly higher than the elastic modulus of Example 2; and the yield strength of Example 1 is 92 MPa, and the yield strength of Example 2 is 75 MPa, and the tensile strength of Example 1 is 172 MPa, and the tensile strength of Example 2 is 156 MPa, so the strength of Example 1 is significantly higher than the strength of Example 2. Therefore, the addition of titanium diboride can effectively improve the disadvantage that the mechanical properties of aluminum alloys after die casting and high-temperature brazing are limited by only adding lanthanum, cerium, iron and manganese. For example, see Figure 3 As shown in the figure, the figure is a microscopic morphology of an aluminum alloy casting. The white area (such as but not limited to the area indicated by the dotted circle 1) represents the intermetallic compound second phase particles containing rare earth elements, and the gray area (such as but not limited to the area indicated by the dotted circle 2) represents the intermetallic compound second phase particles containing iron. The position indicated by the arrow represents the aluminum matrix, and the aluminum matrix accounts for a large proportion in the figure. These intermetallic compound second phase particles are uniformly dispersed in the aluminum matrix. The size of the intermetallic compound second phase particles is small, and the shape is close to block or spherical. This shows that the presence of manganese and titanium diboride can reduce the size and shape of the intermetallic compound second phase particles, achieve the effect of refining the particles, and thus effectively improve the mechanical properties of the aluminum alloy casting. It should be understood that although in Figure 3 Manganese and titanium diboride are not reflected in the casting, but due to the small amount of manganese and titanium diboride added, they may not be observed in a very small microscopic area, but this does not mean that manganese and titanium diboride are not included in the entire aluminum alloy casting. And the arrow only indicates part of the aluminum matrix, but it does not mean that only the position indicated by the arrow is the aluminum matrix.

[0091] Comparative Example 1 is an Al-Si alloy. The melting point of the aluminum alloy casting obtained by using this alloy is lower than 600°C, and it cannot be used for high-temperature brazing. The melting point of the aluminum alloy casting in Comparative Example 2 is higher than 600°C, and it can be used for high-temperature brazing. However, the yield strength after high-temperature brazing is significantly lower than that of Examples 1 to 5, so that the destructive force borne by the aluminum alloy casting in Comparative Example 2 is lower than that borne by the aluminum alloy castings in Examples 1 to 5. The aluminum alloy casting in Comparative Example 2 is more likely to have thread slipping accidents when screwing, so the aluminum alloy casting in Comparative Example 2 is more easily damaged. If the aluminum alloy casting in Comparative Example 2 is used to make the casing of electronic equipment for outdoor use, it is difficult to effectively protect the components in the electronic equipment. In addition, see Figure 4 As shown, (a) is the die casting effect diagram of comparative example 2, and (b) is the die casting effect diagram of embodiment 1. By comparing (a) and (b), it can be known that: although iron and manganese are added in comparative example 2 to increase the demoulding effect, iron and manganese do not contribute to the fluidity of the alloy melt, so when die casting thin-walled castings, it is easy to have incomplete molding problems at high and thin positions, as shown in the dotted circle in (a). The iron and manganese added in embodiment 1 can increase the demoulding effect, and the lanthanum, cerium and titanium diboride added in embodiment 1 can increase the fluidity of the alloy melt, so that when die casting thin-walled castings, they can still be fully molded at high and thin positions, thereby improving the effect of die casting.

[0092] Although the melting point of the aluminum alloy casting in Comparative Example 3 is also higher than 600°C, the yield strength after high-temperature brazing is also low, so the aluminum alloy casting in Comparative Example 3 has the same problem as the aluminum alloy casting in Comparative Example 2. In addition, since nickel is used in Comparative Example 3, and the cost of nickel is higher than the cost of rare earth elements, the production cost of Comparative Example 3 is higher than that of Examples 1 to 5, and the purpose of reducing costs and increasing efficiency cannot be achieved. In addition, nickel is added in Comparative Example 3 and aluminum is more active than nickel, so aluminum will corrode before nickel, resulting in poor corrosion resistance of the aluminum alloy casting containing nickel.

[0093] Based on this, Examples 1 to 5 not only have a higher melting point and can be used for high-temperature brazing, but also have better mechanical properties, corrosion resistance and die-casting effects, and can also reduce production costs, thereby achieving the purpose of reducing costs and increasing efficiency on the basis of being suitable for high-temperature brazing.

[0094] Comparison of bubbling phenomena.

[0095] When high temperature brazing is performed, tunnel furnace atmosphere protection brazing (or vacuum furnace brazing) can be used, the welding temperature can be 610°C (or 580, 590, 600, 620 or 630°C), and the brazing material can be 4343 (or 4045, 4047 or other Al-Si brazing materials). Figure 5 As shown, (a) is a schematic diagram of the bubbling after high-temperature brazing of Example 1, and (b) is a schematic diagram of the bubbling after high-temperature brazing of Comparative Example 2. As can be seen from (a), the bubbling on the surface of the aluminum alloy casting after high-temperature brazing is small, the bubbling height is about 109.25 μm, and it is difficult to see the bubbling with the naked eye. As can be seen from (b), the bubbling on the surface of the aluminum alloy casting after high-temperature brazing is high and the bubbling area is large, and the bubbling can be easily seen by the naked eye, such as the bubbling indicated by the black arrow in Figure (b). Therefore, the aluminum alloy casting provided in the embodiment of the present application is not only suitable for high-temperature brazing, but also has a good integrity after high-temperature brazing.

[0096] Comparison of weld microstructures.

[0097] Reference Figure 6 As shown, (a) is a weld structure diagram of the aluminum alloy casting in Example 1 after high-temperature brazing, and (b) is a weld structure diagram of the aluminum alloy casting in Comparative Example 1 after high-temperature brazing; see Figure 7 The tensile curve shown in the figure, the photo indicated by 1 in the figure is a schematic diagram of the butt-welded tensile sample. By comparing the weld structures shown in (a) and (b), it is found that the material between the two dotted lines in (a) is an embedded brazing filler metal. The brazing filler metal forms a metallurgical bond with the aluminum alloy casting. The brazing filler metal has good wettability on the surface of the aluminum alloy casting, which can better fill the gap between the two aluminum alloy castings and better weld the two aluminum alloy castings. This shows that the aluminum alloy casting provided in the embodiment of the present application has a better welding effect after high-temperature brazing. In addition, Figure 7 In the butt welding tensile test results shown in , the tensile strength of the aluminum alloy casting after high-temperature brazing is as high as 104MPa. This also shows that the aluminum alloy casting has a better welding effect after high-temperature brazing. (b) In the figure, the brazing filler metal is first formed on the surface of the aluminum alloy casting located above as shown in the figure, and then high-temperature brazing is performed. The results show that there is a relatively obvious gap between the brazing filler metal and the surface of the aluminum alloy casting located below as shown in the figure (as shown by the black arrow in the figure), indicating that the two aluminum alloy castings are not effectively welded together, so the welding effect is poor. Therefore, the aluminum alloy casting provided in the embodiment of the present application is not only suitable for high-temperature brazing, but also has a better welding effect after high-temperature brazing.

[0098] Comparison of soldering rate.

[0099] Reference Figure 8 As shown, (a) is an actual structural diagram of an aluminum alloy casting, and (b) is a schematic diagram of the adhesion rate of the brazing filler metal after high-temperature brazing of the aluminum alloy casting in Example 1. After high-temperature brazing of the aluminum alloy casting in Example 1, the brazing filler metal adhesion rate can reach more than 70%, which can better weld the two aluminum alloy castings together and improve the welding strength. Therefore, the aluminum alloy casting provided in the embodiment of the present application is not only suitable for high-temperature brazing, but also has a good welding strength after high-temperature brazing, thereby improving the strength of the structure after welding.

[0100] Corrosion resistance comparison.

[0101] Reference Fig. 9 As shown, (a) is a corrosion resistance effect diagram of the aluminum alloy casting in Example 1 after high-temperature brazing, and (b) is a corrosion resistance effect diagram of the aluminum alloy casting in Comparative Example 3 after high-temperature brazing. By comparison, it is found that after the aluminum alloy casting in Example 1 is subjected to high-temperature brazing, it is subjected to a salt spray test for 30 days. There are no white corrosion spots on the surface of the aluminum alloy casting after high-temperature brazing, and the depth of the corrosion pit is low and not more than 0.2mm, indicating that the corrosion resistance effect is good. After the aluminum alloy casting in Comparative Example 3 is subjected to a salt spray test for 30 days after high-temperature brazing, there are a large number of white corrosion spots on the surface of the aluminum alloy casting after high-temperature brazing, and the depth of the corrosion pit is relatively obvious, at least 1.5mm, indicating that the corrosion resistance effect is poor. Therefore, the aluminum alloy casting provided in the embodiment of the present application is not only suitable for high-temperature brazing, but also has good corrosion resistance after high-temperature brazing.

[0102] Through the above analysis, it can be seen that the aluminum alloy of the embodiment of the present application, through the reasonable design of each component, makes the obtained aluminum alloy have the advantages of high melting point, excellent mechanical properties, corrosion resistance, good thermal conductivity, low production cost, etc., and can be suitable for high-temperature brazing, which can solve the problem that aluminum alloy castings in the prior art cannot be brazed at high temperature.

[0103] It should be noted that: in this application, if there is no special description, all the embodiments and implementation methods mentioned herein can be combined with each other to form a new technical solution. In this application, if there is no special description, all the technical features and features mentioned herein can be combined with each other to form a new technical solution. In this application, if there is no special description, percentage (%) or part refers to the weight percentage or weight part relative to the composition. In this application, if there is no special description, the components or their components involved can be combined with each other to form a new technical solution. In this application, unless otherwise specified, the numerical range "a-b" represents an abbreviation of any real number combination between a and b, and includes a and b, where a and b are both real numbers. For example, the numerical range "6-22" means that all real numbers between "6-22" have been listed in this article, and "6-22" is just an abbreviation of these numerical combinations. The "range" disclosed in this application can be one or more lower limits and one or more upper limits in the form of lower limits and upper limits. In this application, unless otherwise specified, each reaction or operation step can be performed sequentially or in sequence.

[0104] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An aluminum alloy, characterized in that: In terms of mass percentage, it includes: Lanthanum: 0.5% to 15%, Cerium: 0.5% to 15%, Iron: 0.05% to 3%, Manganese: 0.001% to 0.590%, Titanium diboride: 0.01% to 5%, Aluminum: ≥80%, Unavoidable impurities ≤0.3%.

2. The aluminum alloy according to claim 1, characterized in that Calculated by mass percentage, the lanthanum comprises 2% to 5%, the cerium comprises 4% to 9%, the iron comprises 0.5% to 2%, the manganese comprises 0.001% to 0.4%, the titanium diboride comprises 0.1% to 2%, the aluminum comprises ≥85%, and the unavoidable impurities comprise ≤0.3%.

3. The aluminum alloy according to claim 1 or 2, characterized in that Calculated by mass percentage, the present invention comprises: 3% to 4% of lanthanum, 5.5% to 7.5% of cerium, 1.0% to 1.5% of iron, 0.001% to 0.2% of manganese, 0.3% to 0.7% of titanium diboride, ≥85% of aluminum, and ≤0.3% of unavoidable impurities.

4. The aluminum alloy according to any one of claims 1 to 3, characterized in that: The aluminum alloy further includes less than or equal to 1% zirconium by mass.

5. The aluminum alloy according to claim 4, characterized in that Measured by mass percentage, the zirconium content in the aluminum alloy is 0.05% to 0.25%.

6. The aluminum alloy according to any one of claims 1 to 5, characterized in that: The aluminum alloy further includes less than or equal to 3% yttrium by mass percentage.

7. The aluminum alloy according to claim 6, characterized in that Measured by mass percentage, the content of yttrium in the aluminum alloy is 0.5% to 2.5%.

8. The aluminum alloy according to any one of claims 1 to 7, characterized in that: The aluminum alloy further includes less than or equal to 3% zinc by mass percentage.

9. The aluminum alloy according to claim 8, characterized in that Calculated by mass percentage, the zinc content in the aluminum alloy is 1.5% to 2.5%.

10. The aluminum alloy according to any one of claims 1 to 9, characterized in that: The aluminum alloy also includes less than or equal to 3% samarium by mass.

11. The aluminum alloy according to claim 10, characterized in that Measured by mass percentage, the content of samarium in the aluminum alloy is 0.5% to 2.5%.

12. The aluminum alloy according to any one of claims 1 to 11, characterized in that: The aluminum alloy further includes less than or equal to 2% magnesium by mass.

13. The aluminum alloy according to claim 12, characterized in that Measured by mass percentage, the content of magnesium in the aluminum alloy is 0.2% to 0.5%.

14. A method for manufacturing an aluminum alloy casting, characterized in that: include: Deslagging and degassing the alloy melt; The composition of the alloy melt is consistent with the composition of the aluminum alloy as claimed in any one of claims 1 to 13; The alloy melt after the deslagging and degassing treatment is liquid cast to obtain the aluminum alloy casting.

15. The method according to claim 14, characterized in that Also includes: Before the alloy melt is subjected to the slag removal and degassing treatment, raw materials weighed according to the components of the aluminum alloy are mixed and melted to obtain the alloy melt; Wherein, lanthanum and cerium are introduced into the alloy melt in the form of an intermediate alloy formed by aluminum, the lanthanum and the cerium; and / or, iron is introduced into the alloy melt in the form of a master alloy formed by the aluminum and the iron; and / or, zirconium is introduced into the alloy melt in the form of a master alloy formed by the aluminum and the zirconium; and / or, yttrium is introduced into the alloy melt in the form of a master alloy formed by the aluminum and the yttrium; and / or, titanium diboride is introduced into the alloy melt in the form of a master alloy formed by the aluminum and the titanium diboride; and / or, samarium is introduced into the alloy melt in the form of a master alloy formed by the aluminum and the samarium; and / or, manganese is introduced into the alloy melt in the form of a master alloy formed by the aluminum and the manganese; And / or, magnesium is introduced into the alloy melt in the form of pure magnesium ingots.

16. A box, characterized in that: It comprises an aluminum alloy casting, wherein the material of the aluminum alloy casting comprises the aluminum alloy as claimed in any one of claims 1 to 13.

17. A method for manufacturing a box, characterized in that: include: An aluminum alloy casting produced by the production method according to claim 14 or 15; The aluminum alloy casting is brazed at high temperature.

18. An electronic device, characterized in that: include: A processing unit, and a housing as claimed in claim 16, wherein the processing unit is located in the housing.

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