WO2023231352A1 - Produit en alliage d'aluminium coulé sous pression à conductivité thermique élevée et son procédé de préparation, et radiateur - Google Patents

Produit en alliage d'aluminium coulé sous pression à conductivité thermique élevée et son procédé de préparation, et radiateur Download PDF

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WO2023231352A1
WO2023231352A1 PCT/CN2022/136577 CN2022136577W WO2023231352A1 WO 2023231352 A1 WO2023231352 A1 WO 2023231352A1 CN 2022136577 W CN2022136577 W CN 2022136577W WO 2023231352 A1 WO2023231352 A1 WO 2023231352A1
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content
die
aluminum alloy
cast aluminum
alloy product
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PCT/CN2022/136577
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Chinese (zh)
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党年钊
王恒德
聂志东
刘金
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中兴通讯股份有限公司
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • 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
    • 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
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • 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
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating

Definitions

  • the present disclosure relates to the field of communications, and specifically to a high thermal conductivity die-cast aluminum alloy product, a preparation method thereof, and a radiator.
  • radiators of wireless base station equipment are prepared by aluminum alloy die-casting process.
  • the die-casting process is also a cost-effective manufacturing process for radiators.
  • Die casting also known as pressure casting, is a special casting process with high production efficiency and low cutting. It is a process in which molten metal fills the mold cavity at high speed and high pressure, and then crystallizes and solidifies under high pressure to form a casting. Because die-cast aluminum alloy has the characteristics of high thermal conductivity, light weight, easy manufacturing, corrosion resistance, and good mechanical properties, its products are widely used in aviation, automobiles, electrical appliances, communications and other industries.
  • the metal thermal conductivity of pure aluminum has the best cost performance. Most related high thermal conductivity die-cast aluminum alloy products obtain high thermal conductivity by increasing the mass proportion of aluminum in the die-cast aluminum alloy composition and improving the purity of the alloy. However, as the mass proportion of aluminum increases, castings often have problems such as easy mold sticking, poor molding, and a significant decrease in mechanical properties during die casting.
  • Embodiments of the present disclosure provide a high thermal conductivity die-cast aluminum alloy product, a preparation method thereof, and a radiator.
  • an embodiment of the present disclosure provides a method for preparing a high thermal conductivity die-cast aluminum alloy product, which includes: putting an aluminum-silicon alloy into a smelting furnace, raising the temperature to melt the aluminum-silicon alloy; Add a refining agent for refining; let the molten metal in the smelting furnace stand and then pour it into a transfer bag; add an aluminum strontium master alloy to the transfer bag to melt the aluminum strontium master alloy and mix it with the metal
  • the molten liquid is mixed to obtain a mixed molten liquid, and the strontium content in the mixed molten liquid is 0.02%-0.04%; the mixed molten liquid is subjected to a die-casting process to obtain a die-cast aluminum alloy product, and the components and contents of the die-cast aluminum alloy product are They are: silicon, content is 7.5%-9%; iron, content is 0.7%-0.95%; copper, content is ⁇ 0.02%; magnesium, content is ⁇ 0.02%; manganese, content is
  • embodiments of the present disclosure provide a high thermal conductivity die-cast aluminum alloy product, which is prepared by using the aforementioned preparation method of a high thermal conductivity die-cast aluminum alloy product.
  • the composition and content of the die-cast aluminum alloy product are: silicon , content is 7.5%-9%; iron, content is 0.7%-0.95%; copper, content is ⁇ 0.02%; magnesium, content is ⁇ 0.02%; manganese, content is ⁇ 0.01%; chromium, content is ⁇ 0.01% ; Titanium, content is ⁇ 0.01%; Vanadium, content is ⁇ 0.01%; Strontium, content is 0.02%-0.04%; the rest are aluminum and impurity elements, wherein the content of a single impurity element in the impurity elements is ⁇ 0.05%, The total content of the impurity elements is ⁇ 0.15%.
  • an embodiment of the present disclosure provides a heat sink, which is made of the aforementioned high thermal conductivity die-cast aluminum alloy product.
  • Figure 1 is a flow chart of a method for preparing a high thermal conductivity die-cast aluminum alloy product according to an embodiment of the present disclosure.
  • embodiments of the present disclosure provide a method for preparing high thermal conductivity die-cast aluminum alloy products.
  • the preparation method includes: putting aluminum-silicon alloy into a smelting furnace, raising the temperature to melt the aluminum-silicon alloy; adding refining material into the smelting furnace.
  • the molten metal in the smelting furnace is allowed to stand and then poured into the transfer bag; the aluminum-strontium master alloy is added to the transfer bag to melt the aluminum-strontium master alloy and mix it with the molten metal to obtain a mixed molten liquid.
  • the content of strontium in the liquid is 0.02%-0.04%; die-casting the mixed melt to obtain die-cast aluminum alloy products; and heat-treating the die-cast aluminum alloy products.
  • the thermal conductivity of the high thermal conductivity die-cast aluminum alloy products prepared by the above method can be improved. Reaching more than 180W/(m ⁇ K), the body of the radiator made of this material has good heat dissipation effect and can be used in wireless communication base station radiators, etc.
  • Aluminum-silicon alloy is put into the smelting furnace.
  • Aluminum-silicon alloy has good casting performance and is suitable for large, thin-walled, complex-shaped castings.
  • Aluminum-silicon alloy includes related brand alloy AlSi8.
  • the content of silicon in the brand alloy AlSi8 is relatively high, and it is added
  • aluminum-silicon alloys can also be partially recycled materials and pure aluminum, which are processed and prepared by using recycled materials and pure aluminum as raw materials, thereby realizing the recycling and reuse of materials and reducing costs. It should be noted that in actual use, the aluminum-silicon alloy includes but is not limited to the two aforementioned aluminum-silicon alloy materials.
  • aluminum-silicon alloys include hypoeutectic aluminum-silicon alloys, and all alloys whose components are lower than the eutectic composition point are called hypoeutectic aluminum-silicon alloys.
  • Hypoeutectic aluminum-silicon alloy is used as the matrix raw material and prepared by the above method, and the obtained material has high thermal conductivity.
  • the mass proportion of aluminum in the die-cast aluminum alloy is usually increased or the purity of the alloy is increased to obtain high thermal conductivity aluminum.
  • problems such as easy mold sticking, poor molding, and low mechanical properties will gradually occur during die casting.
  • the die-cast aluminum alloy product prepared by the aforementioned method of this embodiment does not need to further increase the mass proportion of aluminum, and can also achieve a product with higher thermal conductivity, which reduces the requirements for material purity.
  • the method steps Can be used in mass production.
  • the method provided by this embodiment does not require additional steps to remove impurities in the product, thereby reducing costs.
  • problems such as easy mold sticking, poor molding, and low mechanical properties will not occur during the die-casting process, and the quality stability is higher.
  • Raising the temperature to melt the aluminum-silicon alloy includes: controlling the temperature in the smelting furnace to rise to 750°C-780°C to melt the aluminum-silicon alloy in the smelting furnace.
  • sufficient temperature and heat are required to ensure that the metal and alloy elements are fully melted and dissolved, and the higher the temperature, the faster the melting speed.
  • the interaction time between metal, furnace gas and furnace lining is also short. Therefore, it is required to melt as quickly as possible at high temperatures during operation. Rapid melting can shorten the melting time, improve productivity, and ensure melt quality.
  • the selection of melting temperature can also be determined based on the melting point temperature of different alloys.
  • the melting of aluminum-silicon alloy is in a temperature range.
  • the melting point temperature range of most alloys is quite large. In this range, the metal is in a semi-solid, semi-liquid, semi-molten state. At this time, it is most likely to absorb gas after being exposed to strong hot furnace gas or flame for a long time. Therefore, for example, the melting temperature in this embodiment is 750-780°C. After all the metal is melted, it should be stirred in time to uniformly distribute the alloy components and temperature in the melt, which will help accelerate the melting of the aluminum alloy.
  • a refining agent is added to the smelting furnace for refining.
  • the refining agent is sprayed into the smelting furnace using inert gas, so that the refining agent is fully mixed with the molten metal in the smelting furnace.
  • the refining time of the refining agent is not limited.
  • silicon the content is 7.5%-9%; iron, the content is 0.7%-0.95%; copper, the content is ⁇ 0.02%; magnesium, the content is ⁇ 0.02%; manganese , the content is ⁇ 0.01%; chromium, the content is ⁇ 0.01%, titanium, the content is ⁇ 0.01%; vanadium, the content is ⁇ 0.01%; when the rest is aluminum, the refining time is over.
  • the elemental composition in the molten metal needs to be strictly controlled during the preparation process.
  • Manganese, chromium, titanium, and vanadium elements in the molten metal will greatly reduce the thermal conductivity of the material and must be strictly controlled; iron within a reasonable range can reduce the tendency of mold sticking; silicon can effectively improve the flow of die-cast aluminum alloys properties, increasing the strength of the material.
  • the molten metal in the smelting furnace is allowed to stand and then poured into the transfer bag.
  • the molten metal is transported through the operation package for subsequent die casting and other steps.
  • the molten metal When refining molten metal, the slag in the smelting furnace will mix with the molten metal, thus affecting the purity of the molten metal. Therefore, after refining, the molten metal needs to be left standing for a period of time to ensure that the metal melts from the smelting furnace.
  • the purity of the molten metal poured out.
  • the standing time is 10-15 minutes. As an example, in this embodiment, the standing time of the molten metal is 10 minutes.
  • the aluminum-strontium master alloy is added to the transfer package, and the aluminum-strontium master alloy is melted and mixed with the molten metal to obtain a mixed molten liquid.
  • the content of strontium in the mixed molten liquid is 0.02%-0.04%.
  • adding aluminum-strontium master alloy to the transfer package and melting it in the molten metal effectively reduces the burning loss of strontium, while controlling the strontium content in the mixed melt to ensure the thermal conductivity of the die-cast aluminum alloy. At the same time, it can also effectively maintain the consistent stability of material components.
  • strontium is often added to the smelting furnace. In the high-temperature environment of the smelting furnace, the proportion of strontium in the melt will increase greatly as the smelting time increases. The loss will greatly increase the cost.
  • the aluminum liquid is further refined using rotating degassing equipment.
  • the working principle of the rotating degassing equipment is that inert gas is ejected into the molten metal through the action of the rotating nozzle, producing a large number of small, high-velocity bubbles that are evenly distributed in the molten metal. .
  • the aluminum-strontium master alloy can melt quickly during this process, evenly distribute in the aluminum liquid and play a conditioning role, refine the aluminum phase, and inhibit the growth of the silicon phase.
  • the rotational degassing should be controlled between 10 minutes and 15 minutes. If the time is too short, the aluminum strontium master alloy may not be fully melted and evenly distributed. If the time is too long, the temperature of the aluminum liquid will drop rapidly, which is not conducive to die casting. .
  • the aluminum-strontium master alloy has an elongated strip or rod-shaped structure, and the composition range of the aluminum-strontium master alloy is: 10% strontium, ⁇ 0.3% iron, and ⁇ 0.01% manganese.
  • the aluminum-strontium master alloy material is not easy to melt in the molten metal if it is larger or thicker. Therefore, in order to ensure that the aluminum-strontium master alloy can be completely melted in the molten metal, the aluminum-strontium master alloy should be made of slender strips. shape or rod-like structure.
  • strontium Since the melting range of aluminum-strontium master alloy containing 10% strontium is between 650°C and 770°C, strontium is easily evaporated or oxidized under high temperature conditions, which greatly weakens the deterioration effect and causes a large loss of strontium.
  • the smelting furnace is controlled to maintain a certain temperature, the molten metal is allowed to stand, and then the molten metal is poured from the smelting furnace into the transfer package.
  • a certain temperature may be a temperature range, such as 740°C-760°C.
  • the first temperature is 750 degrees Celsius. By controlling the first temperature to 750 degrees Celsius, the temperature of the molten metal gradually drops from 750 degrees Celsius during the process of pouring it from the smelting furnace into the transfer package. Under this temperature condition, it can meet the requirements for subsequent melting of aluminum strontium master alloy. requirements, and as the temperature drops, strontium is not easy to burn or volatilize.
  • the aluminum-strontium intermediate alloy is added when the molten metal is poured from the smelting furnace into the transfer bag. At this time, the temperature of the mixed melt is at 750°C and continues to decrease.
  • the rotating device is used to refine and degas while accelerating the aluminum-strontium intermediate alloy. Melting of the alloy, thereby achieving better modification treatment.
  • the mixed melt is subjected to a die-casting process to obtain a die-cast aluminum alloy product.
  • the die-casting process includes pouring the mixed melt into a metering furnace of a die-casting machine, and then die-casting the mixed melt in the metering furnace to obtain a die-cast aluminum alloy product.
  • the dosing furnace can also be other equipment that can realize mixed melt casting, such as other components used for die casting in the die casting machine.
  • the die-casting process includes directly alloying the mixed melt to obtain die-cast aluminum alloy products.
  • the die-casting process also includes standing, slag removal and die-casting of the mixed melt to ensure the reliability of each component in the mixed melt.
  • composition and content of die-cast aluminum alloy products are: silicon, content is 7.5%-9%; iron, content is 0.7%-0.95%; copper, content is ⁇ 0.02%; magnesium, content is ⁇ 0.02%; manganese, content is ⁇ 0.01%; chromium, the content is ⁇ 0.01%; titanium, the content is ⁇ 0.01%; vanadium, the content is ⁇ 0.01%; strontium, the content is 0.02%-0.04%; the rest are aluminum and impurity elements; among the impurity elements The content of individual impurity elements is ⁇ 0.05%, and the total content of impurity elements is ⁇ 0.15%.
  • the time for the mixed melt to be poured from the smelting furnace to the dosing furnace should not exceed 30 minutes, and the temperature of the mixed melt should be controlled between 660°C and 700°C during this process.
  • the temperature of the die-casting equipment should be controlled at 640°C-660°C, and if the mixed melt is not used for more than 4 hours, the deterioration of strontium will continue to weaken. At this time, the mixed melt should be poured out and re-smelted.
  • the nozzle material and burrs of the die-cast aluminum alloy product are removed, and the die-cast aluminum alloy products are stacked reasonably. During the stacking process, care should be taken to avoid die-cast aluminum alloy products.
  • the heat dissipation teeth are easily deformed by pressure.
  • heat treatment of the die-cast aluminum alloy product includes: placing the die-cast aluminum alloy product into an aging furnace, controlling the temperature in the aging furnace to rise to a preset temperature range; and after maintaining the preset time, put the die-cast aluminum alloy product into an aging furnace.
  • the alloy product is removed from the aging furnace and the die-cast aluminum alloy product is cooled.
  • Put the die-cast aluminum alloy product into the aging furnace heat the aging furnace for a certain period of time, then take the die-cast aluminum alloy product out of the aging furnace and cool it, thereby completing the heat treatment process of the die-cast aluminum alloy product.
  • the preset temperature range is 250 degrees Celsius - 350 degrees Celsius, and the preset time is 2 hours.
  • control the aging furnace to uniformly heat up to a preset temperature range.
  • technicians can shorten the heat treatment time by increasing the heat treatment temperature, or reduce the heat treatment temperature by extending the heat treatment time, so that die-cast aluminum alloy products are not easy to bulge when the gas content is high. Bubbles can also achieve the purpose of improving thermal conductivity.
  • the thermal conductivity of the die-cast aluminum alloy product obtained is the best when the heat treatment temperature is 250 degrees Celsius - 350 degrees Celsius and the heat treatment time is 2 hours.
  • the temperature in the aging furnace is controlled to be less than 400 degrees Celsius. If die-cast aluminum alloy products heat up too quickly in the aging furnace, the temperature difference between the inside and outside will be too large, resulting in excessive internal stress and small cracks on the interior and surface.
  • the purpose of normalizing is to refine the grains and uniformize the distribution of carbides, remove the internal stress of the material, and reduce the hardness of the material. Generally, after quenching or processing, there is a certain amount of internal stress inside itself, so it is not advisable to heat up too quickly.
  • cooling the die-cast aluminum alloy product includes: controlling the die-cast aluminum alloy product to cool in natural air.
  • die-cast aluminum alloy products can also be controlled to be cooled in air cooling.
  • the cooling methods of die-cast aluminum alloy products include but are not limited to the above.
  • the die-cast aluminum alloy products can also be controlled to be cooled in water cooling.
  • die-cast aluminum alloy products are cooled by water cooling, and the die-cast aluminum alloy products are cooled by water cooling at different temperatures or different times, the thermal conductivity of the die-cast aluminum alloys obtained will be different. Therefore, optional die-cast aluminum alloy products are cooled with natural air.
  • the thermal conductivity of the die-cast aluminum alloy product obtained by directly die-casting the mixed melt is compared with whether the aluminum strontium master alloy is added to the transfer package and whether the heat treatment process is performed.
  • the measurement data of tensile strength, yield strength and elongation are shown in Table 1.
  • the thermal conductivity, tensile strength, yield strength and elongation of the die-cast aluminum alloy products that undergo the heat treatment process are all better than Various properties of thermal conductivity, tensile strength, yield strength and elongation of die-cast aluminum alloy products without heat treatment.
  • the thermal conductivity, tensile strength, yield strength and elongation of the die-cast aluminum alloy products that undergo the heat treatment process are also better than those of the die-cast aluminum alloy that does not undergo the heat treatment process.
  • the thermal conductivity, tensile strength, yield strength and elongation properties of the product are also better than those of the die-cast aluminum alloy that does not undergo the heat treatment process.
  • the thermal conductivity, tensile strength, yield strength and elongation of die-cast aluminum alloy products with aluminum-strontium alloy added to the transfer package are better than those without aluminum-strontium alloy added to the transfer package.
  • the die-cast aluminum alloy product prepared by adding aluminum strontium master alloy to the transfer package and performing a heat treatment process has the highest thermal conductivity, and the tensile strength, yield strength, and elongation are all due to the die-cast aluminum alloy prepared under other conditions. product.
  • the components and contents of the mixed melts of Sample 1, Sample 2, Sample 3 and Sample 4 in the aforementioned Table 1 are all the same, that is, the mixed melts obtained through the same method steps are poured into In the transfer bag, the melt in the transfer bag is divided into four parts and placed to form the aforementioned sample 1, sample 2, sample 3 and sample 4 respectively. In this way, the test conclusions of subsequent related tests are more accurate. It is persuasive and the test results are more reliable.
  • the temperature is generally above 750°C, while the temperature of the mixed molten metal in the transfer package and die-casting equipment is generally between 650°C and 680°C, which is lower than the temperature in the smelting furnace. It can be seen that strontium element is easily lost under high temperature conditions.
  • the capacity of molten aluminum in the smelting furnace is generally around 5 tons, and the factory takes longer to consume materials. Because the industry uses forklifts to transport transfer packages, the general capacity is only 0.9 tons, and it can be consumed in less than 2 hours when producing communication radiators. Therefore, the solution of adding aluminum strontium master alloy to the transfer package is more in line with actual production.
  • the preparation method of high thermal conductivity die-cast aluminum alloy products compared with the currently commonly used preparation methods of high thermal conductivity die-cast aluminum alloy products, does not require new experimental equipment and process steps during the preparation process. It is simple and reduces the requirements for material purity. It can also have similar performance to die-cast aluminum alloy products prepared by using pure aluminum. It also has higher quality stability during the preparation process, has cost advantages, and is easier to achieve mass production. Similarly, compared with the currently commonly used preparation methods of high thermal conductivity die-cast aluminum alloy products, this preparation method effectively reduces the burning loss of strontium, effectively maintains the consistent stability of the material composition, and reduces costs. In addition, under this heat treatment process condition, taking into account both cost and efficiency, the thermal conductivity of the prepared high thermal conductivity die-cast aluminum alloy product is increased by more than 10%.
  • an embodiment of the present disclosure also provides a high thermal conductivity die-cast aluminum alloy product, which is prepared by the preparation method of the high thermal conductivity die-cast aluminum alloy product of the previous embodiment.
  • the composition and content of the aluminum alloy material are: silicon , content is 7.5%-9%; iron, content is 0.7%-0.95%; copper, content is ⁇ 0.02%; magnesium, content is ⁇ 0.02%; manganese, content is ⁇ 0.01%; chromium, content is ⁇ 0.01% ; Titanium, the content is ⁇ 0.01%; Vanadium, the content is ⁇ 0.01%; Strontium, the content is 0.02%-0.04%;
  • the rest are aluminum and impurity elements, among which, the content of a single impurity element in the impurity element is ⁇ 0.05%, and the impurity element The total content is less than 0.15%.
  • a high thermal conductivity die-cast aluminum alloy product made of raw materials with the following mass parts: silicon content is 7.5%, iron content is 0.8%; copper content is 0.01%; magnesium content is 0.015%; manganese content The content of chromium is 0.009%; the content of titanium is 0.007%; the content of vanadium is 0.002%; the content of strontium is 0.02%; the rest is aluminum and impurity elements, among which the content of a single impurity element in the impurity elements is ⁇ 0.05%, the total content of impurity elements is 0.14%.
  • a high thermal conductivity die-cast aluminum alloy product made of the following raw materials in parts by mass: silicon content is 9%, iron content is 0.7%; copper content is 0.017%; magnesium content is 0.01%; manganese content The content of chromium is 0.009%; the content of chromium is 0.005%; the content of titanium is 0.004%; the content of vanadium is 0.009%; the content of strontium is 0.02%; the rest is aluminum and impurity elements, among which the content of a single impurity element in the impurity elements is ⁇ 0.05%, the total content of impurity elements is 0.1%.
  • a high thermal conductivity die-cast aluminum alloy product made of the following raw materials in parts by mass: silicon content is 8%, iron content is 0.95%; copper content is 0.013%; magnesium content is 0.005%; manganese content The content of chromium is 0.03%; the content of titanium is 0.008%; the content of vanadium is 0.005%; the content of strontium is 0.04%; the rest are aluminum and impurity elements, among which the content of a single impurity element in the impurity elements is ⁇ 0.05%, the total content of impurity elements is 0.12%.
  • a high thermal conductivity die-cast aluminum alloy product made of the following raw materials in parts by mass: silicon content is 9%, iron content is 0.7%; copper content is 0.012%; magnesium content is 0.011%; manganese content The content of chromium is 0.007%; the content of titanium is 0.009%; the content of vanadium is 0.004%; the content of strontium is 0.03%; the rest is aluminum and impurity elements, among which the content of a single impurity element in the impurity elements is ⁇ 0.05%, the total content of impurity elements is 0.14%.
  • a high thermal conductivity die-cast aluminum alloy product made of raw materials with the following mass parts: silicon content is 8.7%, iron content is 0.77%; copper content is 0.009%; magnesium content is 0.018%; manganese content
  • the content of chromium is 0.002%; the content of chromium is 0.005%; the content of titanium is 0.008%; the content of vanadium is 0.003%; the content of strontium is 0.036%; the rest is aluminum and impurity elements, among which the content of a single impurity element in the impurity elements is ⁇ 0.05%, the total content of impurity elements is 0.136%.
  • the thermal conductivity test was conducted on the high thermal conductivity die-cast aluminum alloy products of Examples 1 to 5. The test results showed that the thermal conductivity of each high thermal conductivity die-cast aluminum alloy product exceeded 180W/(m ⁇ K). Due to the high thermal conductivity die-cast aluminum Alloy products have high thermal conductivity and can be used in the field of communication technology. They can also be widely used in photovoltaics, new energy vehicles and other fields that require efficient heat dissipation.
  • an embodiment of the present disclosure also provides a radiator, which is made of the aforementioned high thermal conductivity die-cast aluminum alloy product.
  • the high thermal conductivity die-cast aluminum alloy product in this embodiment not only has high thermal conductivity, but also has excellent processing performance, so that it can use various molding processes to process radiators of various complex shapes.
  • the aluminum strontium master alloy is added during the turnover process of the molten metal, and a heat treatment process is adopted after die-casting, the problems of easy mold sticking, poor molding, and significant decline in mechanical properties of castings during die-casting can be solved, achieving
  • the thermal conductivity of aluminum alloy products exceeds 180W/(m ⁇ K).
  • the body of the radiator made of this material has good heat dissipation effect and can be used in wireless communication base station radiators.

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Abstract

La présente invention concerne un produit en alliage d'aluminium coulé sous pression à conductivité thermique élevée et un procédé de préparation de celui-ci, et un radiateur préparé à partir du produit en alliage d'aluminium. Le procédé de préparation comprend : le placement d'un alliage d'aluminium-silicium dans un four de fusion, le chauffage, la fusion et l'affinage de celui-ci, l'étape consistant à laisser reposer celui-ci, puis le coulage de celui-ci dans une poche de transfert, l'ajout d'un alliage intermédiaire d'aluminium-strontium à celle-ci, la fusion de celui-ci pour obtenir un matériau fondu mixte, suivi d'un formage par coulée sous pression, puis la soumission du produit d'alliage d'aluminium coulé sous pression à un traitement thermique.
PCT/CN2022/136577 2022-05-30 2022-12-05 Produit en alliage d'aluminium coulé sous pression à conductivité thermique élevée et son procédé de préparation, et radiateur WO2023231352A1 (fr)

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CN202210602171.6A CN117187630A (zh) 2022-05-30 2022-05-30 高导热压铸铝合金产品及其制备方法、散热器
CN202210602171.6 2022-05-30

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