CN115976372A - High-thermal-conductivity high-strength die-casting aluminum alloy material and preparation method thereof - Google Patents
High-thermal-conductivity high-strength die-casting aluminum alloy material and preparation method thereof Download PDFInfo
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- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
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Abstract
The invention discloses a high-heat-conductivity high-strength die-casting aluminum alloy material and a preparation method thereof, belonging to the technical field of aluminum alloy preparation and comprising the following components in percentage by mass: 0.5-0.6% Fe, 1.0-1.5% Cu, 0.3-0.8% Mn, 0.8-1.1% Cr, 0.05-0.15% Zn, 0.2-0.4% Ti, 0.15-0.22% CO, 1.1-2.2% Ag, 0.3-0.4% V, the balance being AL, the aluminum alloy of the present invention is added with Ag, the aluminum alloy strength is ensured while the thermal conductivity of the aluminum alloy is improved, the method of preparing an aluminum alloy of the present invention adopts adding the remaining alloy powder to the melt aluminum, the melt aluminum and the alloy powder are mixed more uniformly, the thermal conductivity of the present invention reaches 180W/m.K, the aluminum alloy of the present invention has a strength of 400MPa or more, and can be widely popularized in the aerospace field.
Description
Technical Field
The invention relates to the technical field of aluminum alloy preparation, in particular to a high-heat-conductivity high-strength die-casting aluminum alloy material and a preparation method thereof.
Background
An alloy based on aluminum with a certain amount of other alloying elements added is one of light metal materials. In addition to having the general characteristics of aluminum, aluminum alloys have some of the specific characteristics of alloys due to the differences in the types and amounts of alloying elements added. The aluminum alloy has the density of 2.63-2.85 g/cm < 3 >, has higher strength, specific strength close to high alloy steel, specific stiffness exceeding that of steel, good casting performance and plastic processing performance, good electric conduction and heat conduction performance, good corrosion resistance and weldability, can be used as a structural material, and has wide application in aerospace, aviation, transportation, construction, electromechanics, lightening and daily necessities.
High strength aluminum alloys are those having a tensile strength greater than 480MPa, and are mainly alloys based on Al-Cu-Mg and Al-Zn-Mg-Cu, i.e., duralumin alloys and ultraduralumin alloys. The former has slightly lower static strength than the latter, but the use temperature is higher than the latter. The properties of the alloy are greatly different due to different chemical compositions, smelting and solidifying modes, processing techniques and heat treatment systems of the alloy. The highest strength of the North America 7090 aluminum alloy is 855MPa, the strength of the European aluminum alloy is 840MPa, the strength of the Japanese aluminum alloy reaches 900MPa, and the strength of the ultrahigh-strength aluminum alloy reported in China is 740MPa.
The existing aluminum alloy material has high strength, weak heat conductivity, high heat conductivity and low strength, so that a material with heat conduction and high strength is needed to be used for a heat dissipation part or a heat conduction part.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-heat-conductivity high-strength die-casting aluminum alloy material and a preparation method thereof.
The technical scheme of the invention is as follows: a high-heat-conductivity high-strength die-casting aluminum alloy material comprises the following components in percentage by mass: 0.5-0.6% Fe, 1.0-1.5% Cu, 0.3-0.8% Mn, 0.8-1.1% Cr, 0.05-0.15% Zn, 0.2-0.4% Ti, 0.15-0.22% CO, 1.1-2.2% Ag, 0.3-0.4% V, the balance AL.
Further, the preparation method of the high-thermal-conductivity high-strength die-casting aluminum alloy material comprises the following steps:
s1, adding powder preparation:
mixing Fe powder, cu powder, mn powder, cr powder, zn powder, ti powder, CO powder, ag powder and V powder in a mixer according to the mass percentage, wherein the mixing temperature is 120-180 ℃, the rotating speed of the mixer is 180-200r/min, the mixing time is 30-40min, and after the mixing is finished, mixed addition powder is obtained;
s2, mixing raw materials:
adding the AL block into a high-temperature melting furnace for heating, wherein the heating temperature is 720-800 ℃, the heating time is 30-40min, obtaining AL liquid after the AL block is completely melted, adding the mixed addition powder obtained in the step S1 into the AL liquid, stirring at the stirring speed of 80-100r/min during the addition process, and obtaining mixed melt after the addition is finished;
s3, heating and smelting:
raising the temperature in the high-temperature melting furnace to 1250-1500 ℃, continuously stirring at an original stirring speed in the temperature raising process, wherein the temperature raising speed is 5-8 ℃/min, keeping the temperature for 30-40min at constant temperature after the temperature raising is finished, then stopping stirring, keeping the temperature for 20-25min at constant temperature, reducing the temperature to 800-900 ℃, keeping the temperature for 20min, and obtaining a die-casting melt, wherein the temperature reduction speed is 3-5 ℃/min;
s4, die casting:
spraying a release agent on an inner cavity of the die-casting die, injecting the die-casting melt obtained in the step S3 into the die-casting die, sealing the vent hole when the melt flows into the top of the vent hole of the die-casting die, keeping the liquid injection pressure of the die-casting die at 30-50MPa, keeping the die-casting pressure unchanged until the internal die-casting melt is cooled to 100-200 ℃, taking down the liquid injection part, and opening the die after the internal die-casting melt in the die-casting die is naturally cooled to room temperature to obtain a casting;
s5, casting polishing:
removing the bonding metal of the liquid injection hole and the exhaust hole on the casting in the step S4 through wire cutting, and manually removing casting burrs through a grinding machine after removing to obtain an initial casting;
s6, heat treatment:
and (3) placing the primary casting into a heat preservation furnace, heating to 300-400 ℃, preserving heat for 3-4 hours, and cooling along with the furnace after heat preservation is finished to obtain a finished casting.
Furthermore, the granularity of the Fe powder is 55-65 μm, the granularity of the Cu powder is 45-60 μm, the granularity of the Mn powder is 15-20 μm, the granularity of the Cr powder is 25-30 μm, the granularity of the Zn powder is 40-55 μm, the granularity of the Ti powder is 8-20 μm, the granularity of the CO powder is 5-10 μm, the granularity of the Ag powder is 10-20 μm, and the granularity of the V powder is 8-15 μm, and under the matching of the granularity, the components are mixed more uniformly.
Further, the release agent comprises the following components in parts by weight: 5-8 parts of polyvinyl alcohol, 3-6 parts of polyacrylamide, 7-12 parts of modified polytetrafluoroethylene wax, 4-7 parts of siloxane, 10-13 parts of petroleum sulfonic acid, 8-15 parts of hydroxyl silicone oil, 10-20 parts of grease and 80-100 parts of alcohol, and the release agent has good release effect.
Furthermore, the granularity of the AL block is 3-5cm, and the AL block is directly melted, so that the granularity of the AL block is larger, and the cost is saved.
Further, before adding the AL block, the high-temperature melting furnace is vacuumized through a vacuumizing device, after vacuumizing is completed, the vacuum degree in the high-temperature melting furnace is not more than 50mbar, after vacuumizing is completed, protective gas is introduced until the internal pressure of the vacuum furnace is 0.1-0.2MPa, and oxidation of metal at high temperature is prevented through protection of the protective gas.
Furthermore, the protective gas is argon or helium, and the two gases have low cost and good use effect.
Furthermore, the grinding wheel mesh number used by the grinding machine is 100-300 meshes, the power of the grinding machine is 800-1200W, the grinding efficiency is lower when the mesh number is too large, the grinding surface is rougher when the mesh number is too small, the efficiency is high under the mesh number, and the effect is high.
Furthermore, the cutting power of the linear cutting is 3-3.5KW, the thickness of the linear cutting is 0.12-0.2mm, and the linear cutting efficiency is high under the technical parameters.
Further, adding a refining agent into the high-temperature furnace while adding the powder in the step S2, wherein the adding amount of the refining agent is 0.5-0.8% of the total mass of the aluminum alloy raw material, and the refining agent comprises the following components in parts by weight: 1-3 parts of rare earth, 3-4 parts of KCl, 4-5 parts of Mg3N2, 1-3 parts of hexachloroethane, 2-7 parts of graphite powder and a refining agent, and the refining agent is favorable for improving the yield strength of the aluminum alloy.
The invention has the beneficial effects that:
the Ag is added into the aluminum alloy, the strength of the aluminum alloy is ensured, and the thermal conductivity of the aluminum alloy is improved at the same time.
Drawings
FIG. 1 is a flow chart of the preparation of the aluminum alloy material of the invention.
Detailed Description
Example 1:
a high-heat-conductivity high-strength die-casting aluminum alloy material comprises the following components in percentage by mass: 0.5% Fe, 1.0% Cu, 0.3-0.8% Mn, 0.8% Cr, 0.05% Zn, 0.2% Ti, 0.15% CO, 1.1% Ag, 0.3% V, the balance is AL.
Example 2:
the embodiment 2 is different from the embodiment 1 in that the high-heat-conductivity high-strength die-casting aluminum alloy material consists of the following components in percentage by mass: 0.55% Fe, 1.3% Cu, 0.5% Mn, 0.9% Cr, 0.13% Zn, 0.3% Ti, 0.20% CO, 1.8% Ag, 0.35% V, the balance AL.
Example 3:
the embodiment 3 is different from the embodiment 1 in that the high-heat-conductivity high-strength die-casting aluminum alloy material consists of the following components in percentage by mass: 0.6% Fe, 1.5% Cu, 0.8% Mn, 1.1% Cr, 0.15% Zn, 0.4% Ti, 0.22% CO, 2.2% Ag, 0.4% V, the balance AL.
Comparing examples 1-3, example 3 is the best example because the aluminum alloy of example 3 has higher strength and better thermal conductivity.
Example 4:
on the basis of embodiment 3, embodiment 4 provides a preparation method of a high-thermal-conductivity high-strength die-cast aluminum alloy material, which includes the following steps:
s1, adding powder preparation:
mixing Fe powder, cu powder, mn powder, cr powder, zn powder, ti powder, CO powder, ag powder and V powder in a mixer according to the mass percentage, wherein the mixing temperature is 120 ℃, the rotating speed of the mixer is 180r/min, the mixing duration is 30min, and after the mixing is finished, mixed addition powder is obtained;
s2, mixing the raw materials:
adding the AL block into a high-temperature melting furnace for heating, wherein the heating temperature is 720 ℃, the heating time is 30min, obtaining AL liquid after the AL block is completely melted, adding the mixed addition powder obtained in the step S1 into the AL liquid, stirring at the stirring speed of 80r/min during the addition process, and obtaining mixed melt after the addition is finished;
the particle size of Fe powder is 55-65 μm, the particle size of Cu powder is 45-60 μm, the particle size of Mn powder is 15-20 μm, the particle size of Cr powder is 25-30 μm, the particle size of Zn powder is 40-55 μm, the particle size of Ti powder is 8-20 μm, the particle size of CO powder is 5-10 μm, the particle size of Ag powder is 10-20 μm, and the particle size of V powder is 8-15 μm, and under the matching of the particle sizes, the components are mixed more uniformly; the granularity of the AL block is 3-5cm, and the AL block is directly melted, so that the granularity of the AL block is larger, and the cost is saved;
s3, heating and smelting:
raising the temperature in the high-temperature melting furnace to 1250 ℃, continuously stirring at an original stirring speed in the temperature raising process, keeping the temperature at a rate of 5 ℃/min for 30min after the temperature raising is finished, stopping stirring, keeping the temperature at a constant temperature for 20min, reducing the temperature to 800 ℃ for 20min, keeping the temperature at a rate of 3 ℃/min, and obtaining a die-casting melt;
s4, die casting:
spraying a release agent on an inner cavity of the die-casting die, injecting the die-casting melt obtained in the step S3 into the die-casting die, sealing the vent hole when the melt flows into the top of the vent hole of the die-casting die, keeping the liquid injection pressure of the die-casting die at 30MPa, keeping the die-casting pressure unchanged until the internal die-casting melt is cooled to 100 ℃, taking down the liquid injection part, and opening the die after the internal die-casting melt in the die-casting die is naturally cooled to room temperature to obtain a casting;
the release agent comprises the following components in parts by weight: 5 parts of polyvinyl alcohol, 3 parts of polyacrylamide, 7 parts of modified polytetrafluoroethylene wax, 4 parts of siloxane, 10 parts of petroleum sulfonic acid, 8 parts of hydroxyl silicone oil, 10 parts of grease and 80 parts of alcohol, and the demolding effect of the demolding agent is good;
s5, casting polishing:
removing bonding metal of the liquid injection hole and the exhaust hole on the casting in the step S4 through wire cutting, and manually removing casting burrs through a grinding machine after removing to obtain an initial casting; the grinding machine has the advantages that the mesh number of the grinding wheels is 100 meshes, the power of the grinding machine is 800W, the grinding efficiency is low when the mesh number is too large, the grinding surface is rough when the mesh number is too small, the efficiency is high under the mesh number, and the effect is high.
The cutting power of the linear cutting is 3KW, the thickness of the linear cutting is 0.12mm, and the linear cutting efficiency is high under the technical parameters
S6, heat treatment:
and (3) placing the primary casting into a heat preservation furnace, heating to 300 ℃, preserving heat for 3 hours, and cooling along with the furnace after heat preservation is finished to obtain a finished casting.
Example 5:
on the basis of embodiment 3, embodiment 5 provides a preparation method of a high-thermal-conductivity high-strength die-cast aluminum alloy material, which includes the following steps:
s1, adding powder preparation:
mixing Fe powder, cu powder, mn powder, cr powder, zn powder, ti powder, CO powder, ag powder and V powder in a mixer according to the mass percentage, wherein the mixing temperature is 150 ℃, the rotating speed of the mixer is 190r/min, the mixing duration is 35min, and after the mixing is finished, mixed addition powder is obtained;
s2, mixing raw materials:
adding the AL block into a high-temperature melting furnace for heating, wherein the heating temperature is 780 ℃, the heating time is 35min, obtaining AL liquid after the AL block is completely melted, adding the mixed addition powder obtained in the step S1 into the AL liquid, stirring at the stirring speed of 90r/min during the addition process, and obtaining mixed melt after the addition is finished;
the particle size of Fe powder is 55-65 μm, the particle size of Cu powder is 45-60 μm, the particle size of Mn powder is 15-20 μm, the particle size of Cr powder is 25-30 μm, the particle size of Zn powder is 40-55 μm, the particle size of Ti powder is 8-20 μm, the particle size of CO powder is 5-10 μm, the particle size of Ag powder is 10-20 μm, and the particle size of V powder is 8-15 μm, and under the matching of the particle sizes, the components are mixed more uniformly; the granularity of the AL block is 3-5cm, and the AL block is directly melted, so that the granularity of the AL block is larger, and the cost is saved;
s3, heating and smelting:
raising the temperature in the high-temperature melting furnace to 1400 ℃, continuously stirring at an original stirring speed in the heating process, keeping the temperature at the heating rate of 7 ℃/min for 35min at constant temperature after the heating is finished, stopping stirring, keeping the temperature at constant temperature for 23min, reducing the temperature to 850 ℃ for 20min at the cooling rate of 4 ℃/min, and obtaining a die-casting melt;
s4, die casting:
spraying a release agent on an inner cavity of the die-casting die, injecting the die-casting melt obtained in the step S3 into the die-casting die, sealing the vent hole when the melt flows into the top of the vent hole of the die-casting die, keeping the liquid injection pressure of the die-casting die at 40MPa, cooling the die-casting melt to 150 ℃ while keeping the die-casting pressure unchanged, taking down the liquid injection part, and opening the die after the die-casting melt in the die-casting die is naturally cooled to room temperature to obtain a casting;
the release agent comprises the following components in parts by weight: 6 parts of polyvinyl alcohol, 5 parts of polyacrylamide, 10 parts of modified polytetrafluoroethylene wax, 5 parts of siloxane, 11 parts of petroleum sulfonic acid, 10 parts of hydroxyl silicone oil, 15 parts of grease and 90 parts of alcohol, and the demolding effect of the demolding agent is good;
s5, casting polishing:
removing the bonding metal of the liquid injection hole and the exhaust hole on the casting in the step S4 through wire cutting, and manually removing casting burrs through a grinding machine after removing to obtain an initial casting; the grinding machine has the advantages that the mesh number of grinding wheels is 200 meshes, the power of the grinding machine is 1000W, the grinding efficiency is low when the mesh number is too large, the grinding surface is rough when the mesh number is too small, the efficiency is high under the mesh number, and the effect is high.
The cutting power of the linear cutting is 3.3KW, the thickness of the linear cutting is 0.15mm, and the linear cutting efficiency is high under the technical parameters
S6, heat treatment:
and (3) placing the primary casting into a heat preservation furnace, heating to 300-400 ℃, preserving heat for 3-4 hours, and cooling along with the furnace after heat preservation is finished to obtain a finished casting.
Example 6:
on the basis of embodiment 3, embodiment 6 provides a preparation method of a high-thermal-conductivity high-strength die-cast aluminum alloy material, which includes the following steps:
s1, adding powder preparation:
mixing Fe powder, cu powder, mn powder, cr powder, zn powder, ti powder, CO powder, ag powder and V powder in a mixer according to the mass percentage, wherein the mixing temperature is 180 ℃, the rotating speed of the mixer is 200r/min, the mixing duration is 40min, and after the mixing is finished, mixed addition powder is obtained;
s2, mixing the raw materials:
adding the AL blocks into a high-temperature melting furnace for heating, wherein the heating temperature is 800 ℃, the heating time is 40min, obtaining AL liquid after the AL blocks are completely melted, adding the mixed addition powder obtained in the step S1 into the AL liquid, stirring at the stirring speed of 100r/min during the addition process, and obtaining mixed melt after the addition is finished;
the particle size of Fe powder is 55-65 μm, the particle size of Cu powder is 45-60 μm, the particle size of Mn powder is 15-20 μm, the particle size of Cr powder is 25-30 μm, the particle size of Zn powder is 40-55 μm, the particle size of Ti powder is 8-20 μm, the particle size of CO powder is 5-10 μm, the particle size of Ag powder is 10-20 μm, and the particle size of V powder is 8-15 μm, and under the matching of the particle sizes, the components are mixed more uniformly; the granularity of the AL block is 3-5cm, and the AL block is directly melted, so that the granularity of the AL block is larger, and the cost is saved;
s3, heating and smelting:
raising the temperature in the high-temperature melting furnace to 1500 ℃, continuously stirring at an original stirring speed in the temperature raising process, keeping the temperature raising rate at 8 ℃/min for 40min at a constant temperature after the temperature raising is finished, stopping stirring, keeping the temperature at the constant temperature for 25min, reducing the temperature to 900 ℃ for 20min at a temperature reducing rate of 5 ℃/min, and obtaining a die-casting melt;
s4, die casting:
spraying a release agent on an inner cavity of the die-casting die, injecting the die-casting melt obtained in the step S3 into the die-casting die, sealing the vent hole when the melt flows into the top of the vent hole of the die-casting die, keeping the liquid injection pressure of the die-casting die at 50MPa, cooling the die-casting melt to 200 ℃ while keeping the die-casting pressure unchanged, taking down the liquid injection part, and opening the die after the die-casting melt in the die-casting die is naturally cooled to room temperature to obtain a casting;
the release agent comprises the following components in parts by weight: 8 parts of polyvinyl alcohol, 6 parts of polyacrylamide, 12 parts of modified polytetrafluoroethylene wax, 7 parts of siloxane, 13 parts of petroleum sulfonic acid, 15 parts of hydroxy silicone oil, 20 parts of grease and 100 parts of alcohol, and the demolding effect of the demolding agent is good;
s5, casting polishing:
removing the bonding metal of the liquid injection hole and the exhaust hole on the casting in the step S4 through wire cutting, and manually removing casting burrs through a grinding machine after removing to obtain an initial casting; the grinding wheel mesh number used by the grinding machine is 300 meshes, the power of the grinding machine is 1200W, the grinding efficiency is low when the mesh number is too large, the grinding surface is rough when the mesh number is too small, the efficiency is high under the mesh number, and the effect is high.
The cutting power of the linear cutting is 3.5KW, the thickness of the linear cutting is 0.2mm, and the linear cutting efficiency is high under the technical parameters
S6, heat treatment:
and (3) placing the primary casting into a heat preservation furnace, heating to 400 ℃, preserving heat for 4 hours, and cooling along with the furnace after heat preservation is finished to obtain a finished casting.
Comparing example 4 to example 6, example 6 produced the most efficient and best quality aluminum alloy, and thus example 6 is the best example.
Example 7:
on the basis of the embodiment 6, the embodiment 7 is different from the embodiment 6 in that before the AL block is added into the high-temperature melting furnace, vacuum pumping is performed through a vacuum pumping device, the vacuum degree in the high-temperature melting furnace is 50mbar after the vacuum pumping is completed, protective gas is introduced until the air pressure in the vacuum furnace is 0.1Mpa after the vacuum pumping is completed, and the metal is prevented from being oxidized at high temperature through the protection of the protective gas; the protective gas is argon or helium, and the two gases have low cost and good use effect.
Example 8:
on the basis of the embodiment 6, the embodiment 8 is different from the embodiment 6 in that before the AL block is added into the high-temperature melting furnace, vacuum pumping is performed through vacuum pumping equipment, the vacuum degree in the high-temperature melting furnace is 40mbar after the vacuum pumping is completed, protective gas is introduced until the air pressure in the vacuum furnace is 0.5Mpa after the vacuum pumping is completed, and the metal is prevented from being oxidized at high temperature through the protection of the protective gas; the protective gas is argon or helium, and the two gases have low cost and good use effect.
Example 9:
on the basis of the embodiment 6, the embodiment 9 is different from the embodiment 6 in that before the AL block is added into the high-temperature melting furnace, vacuum pumping is performed through vacuum pumping equipment, the vacuum degree in the high-temperature melting furnace after the vacuum pumping is completed is 30mbar, protective gas is introduced into the vacuum furnace until the air pressure in the vacuum furnace is 0.2Mpa after the vacuum pumping is completed, and the metal is prevented from being oxidized at high temperature through the protection of the protective gas; the protective gas is argon or helium, and the two gases have low cost and good use effect.
Comparative example 7 to example 9, example 9 produced the highest quality aluminum alloy with the best strength and thermal conductivity, and thus example 9 is the best example.
Example 10:
example 10 differs from example 9 in that example 10 added the refining agent to the high temperature furnace at the same time as the addition of the powder in step S2, the amount of the refining agent added was 0.5% of the total mass of the aluminum alloy raw material, and the refining agent consisted of the following components in parts by weight: 1-3 parts of rare earth, 3-4 parts of KCl, 4-5 parts of Mg3N2, 1-3 parts of hexachloroethane, 2-7 parts of graphite powder, and the refining agent is favorable for improving the yield strength of the aluminum alloy.
Example 11:
example 11 differs from example 9 in that example 11 added the refining agent to the high temperature furnace in an amount of 0.6% of the total mass of the aluminum alloy raw material while adding the additive powder in step S2, the refining agent consisting of the following components in parts by weight: 2 parts of rare earth, 3.5 parts of KCl, 4.5 parts of Mg3N2, 1.5 parts of hexachloroethane, 3 parts of graphite powder, and the refining agent is favorable for improving the yield strength of the aluminum alloy.
Example 12:
example 12 differs from example 9 in that example 12 adds a refining agent to the high temperature furnace at the same time as the addition of the powder in step S2, the amount of the refining agent added being 0.8% of the total mass of the aluminum alloy raw material, the refining agent consisting of the following components in parts by weight: 3 parts of rare earth, 4 parts of KCl, 5 parts of Mg3N2, 3 parts of hexachloroethane and 7 parts of graphite powder, and the refining agent is favorable for improving the yield strength of the aluminum alloy.
Comparative example 10 to example 12, the effect of adding the refining agent was the best in example 12, and the strength of the prepared aluminum alloy was the highest and the thermal conductivity was the best, so example 12 was the best example.
Claims (10)
1. The die-casting aluminum alloy material with high heat conductivity and high strength is characterized by comprising the following components in percentage by mass: 0.5-0.6% Fe, 1.0-1.5% Cu, 0.3-0.8% Mn, 0.8-1.1% Cr, 0.05-0.15% Zn, 0.2-0.4% Ti, 0.15-0.22% CO, 1.1-2.2% Ag, 0.3-0.4% V, the balance is AL.
2. The preparation method of the high-heat-conductivity high-strength die-casting aluminum alloy material as claimed in claim 1, characterized by comprising the following steps:
s1, preparation of additive powder:
mixing Fe powder, cu powder, mn powder, cr powder, zn powder, ti powder, CO powder, ag powder and V powder in a mixer according to the mass percentage, wherein the mixing temperature is 120-180 ℃, the rotating speed of the mixer is 180-200r/min, the mixing duration is 30-40min, and after the mixing is finished, mixed addition powder is obtained;
s2, mixing the raw materials:
adding the AL block into a high-temperature melting furnace for heating, wherein the heating temperature is 720-800 ℃, the heating time is 30-40min, obtaining AL liquid after the AL block is completely melted, adding the mixed addition powder obtained in the step S1 into the AL liquid, stirring at the stirring speed of 80-100r/min during the addition process, and obtaining mixed melt after the addition is finished;
s3, heating and smelting:
raising the temperature in the high-temperature melting furnace to 1250-1500 ℃, continuously stirring at an original stirring speed in the temperature raising process, wherein the temperature raising speed is 5-8 ℃/min, keeping the temperature for 30-40min at constant temperature after the temperature raising is finished, then stopping stirring, keeping the temperature for 20-25min at constant temperature, reducing the temperature to 800-900 ℃, keeping the temperature for 20min, and obtaining a die-casting melt, wherein the temperature reduction speed is 3-5 ℃/min;
s4, die casting:
spraying a release agent on an inner cavity of the die-casting die, injecting the die-casting melt obtained in the step S3 into the die-casting die, sealing the vent hole when the melt flows into the top of the vent hole of the die-casting die, keeping the liquid injection pressure of the die-casting die at 30-50MPa, keeping the die-casting pressure unchanged until the internal die-casting melt is cooled to 100-200 ℃, taking down the liquid injection part, and opening the die after the internal die-casting melt in the die-casting die is naturally cooled to room temperature to obtain a casting;
s5, casting polishing:
removing the bonding metal of the liquid injection hole and the exhaust hole on the casting in the step S4 through wire cutting, and manually removing casting burrs through a grinding machine after removing to obtain an initial casting;
s6, heat treatment:
and (3) placing the primary casting into a heat preservation furnace, heating to 300-400 ℃, preserving heat for 3-4 hours, and cooling along with the furnace after heat preservation is finished to obtain a finished casting.
3. The method for preparing a die-casting aluminum alloy material with high thermal conductivity and high strength as claimed in claim 2, wherein the grain size of Fe powder is 55-65 μm, the grain size of Cu powder is 45-60 μm, the grain size of Mn powder is 15-20 μm, the grain size of Cr powder is 25-30 μm, the grain size of Zn powder is 40-55 μm, the grain size of Ti powder is 8-20 μm, the grain size of CO powder is 5-10 μm, the grain size of Ag powder is 10-20 μm, and the grain size of V powder is 8-15 μm.
4. The preparation method of the high-thermal-conductivity high-strength die-casting aluminum alloy material as claimed in claim 2, wherein the mold release agent is composed of the following components in parts by weight: 5-8 parts of polyvinyl alcohol, 3-6 parts of polyacrylamide, 7-12 parts of modified polytetrafluoroethylene wax, 4-7 parts of siloxane, 10-13 parts of petroleum sulfonic acid, 8-15 parts of hydroxyl silicone oil, 10-20 parts of grease and 80-100 parts of alcohol.
5. The method for preparing the high-thermal-conductivity high-strength die-casting aluminum alloy material as claimed in claim 2, wherein the grain size of the AL blocks is 3-5cm.
6. The method for preparing the high-thermal-conductivity high-strength die-casting aluminum alloy material according to claim 2, wherein before the AL block is added into the high-temperature furnace, vacuum pumping is performed through vacuum pumping equipment, after the vacuum pumping is completed, the vacuum degree in the high-temperature furnace is less than or equal to 50mbar, and after the vacuum pumping is completed, protective gas is introduced until the air pressure in the vacuum furnace is 0.1-0.2MPa.
7. The method for preparing the high-heat-conductivity high-strength die-casting aluminum alloy material according to claim 6, wherein the protective gas is argon or helium.
8. The method for preparing the die-casting aluminum alloy material with high heat conductivity and high strength as claimed in claim 2, wherein the grinding wheel mesh number used by the grinding machine is 100-300 meshes, and the power of the grinding machine is 800-1200W.
9. The method for preparing the die-casting aluminum alloy material with high heat conductivity and high strength as claimed in claim 2, wherein the cutting power of the wire-electrode cutting is 3-3.5KW, and the thickness of the wire-electrode cutting is 0.12-0.2mm.
10. The method for preparing the high-heat-conductivity high-strength die-casting aluminum alloy material as claimed in claim 2, wherein the cutting power of the wire cutting is 3-3.5KW.
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| US5334266A (en) * | 1990-03-06 | 1994-08-02 | Yoshida Kogyo K.K. | High strength, heat resistant aluminum-based alloys |
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