CN115976372B - High-heat-conductivity high-strength die-casting aluminum alloy material and preparation method thereof - Google Patents
High-heat-conductivity high-strength die-casting aluminum alloy material and preparation method thereof Download PDFInfo
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- 238000005266 casting Methods 0.000 claims description 36
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- 238000010438 heat treatment Methods 0.000 claims description 32
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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% of Fe, 1.0-1.5% of Cu, 0.3-0.8% of Mn, 0.8-1.1% of Cr, 0.05-0.15% of Zn, 0.2-0.4% of Ti, 0.15-0.22% of CO, 1.1-2.2% of Ag, 0.3-0.4% of V and the balance of AL.
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 specific characteristics of some alloys due to the variety and amount of alloying elements added. The density of the aluminum alloy is 2.63-2.85 g/cm < 3 >, the specific strength is close to that of high alloy steel, the specific rigidity is higher than that of steel, the aluminum alloy has good casting performance and plastic workability, good electric conductivity and heat conductivity, 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.
The high-strength aluminum alloy is aluminum alloy with tensile strength of more than 480MPa, and mainly comprises Al-Cu-Mg and Al-Zn-Mg-Cu based alloys, namely duralumin alloys and super duralumin alloys. The former has a slightly lower static strength than the latter, but a higher use temperature than the latter. Because of the different chemical components, smelting and solidification modes, processing technology and heat treatment systems of the alloy, the alloy has very different properties. 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 is 900MPa, and the strength of the ultra-high-strength aluminum alloy reported in China is 740MPa.
The existing aluminum alloy material has low thermal conductivity with high strength, high thermal conductivity and low strength, so that a material with both thermal conductivity and high strength is needed for a heat dissipation member or a heat conduction member.
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, and the balance AL.
Further, the preparation method of the high-heat-conductivity high-strength die-casting aluminum alloy material comprises the following steps of:
s1, preparing 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 at 120-180 deg.c at 180-200r/min for 30-40min to obtain mixed additive powder;
s2, mixing raw materials:
heating the AL block in a high-temperature melting furnace at 720-800 ℃ for 30-40min to obtain AL liquid after the AL block is completely melted, adding the mixed additive powder obtained in the step S1 into the AL liquid, and stirring at 80-100r/min during the adding process to obtain a mixed melt after the adding is completed;
s3, heating and smelting:
continuously stirring the mixture at a constant stirring speed of 5-8 ℃/min in the heating process when the temperature in the high-temperature melting furnace is raised to 1250-1500 ℃, keeping the constant temperature for 30-40min after the temperature is raised, stopping stirring, keeping the constant temperature for 20-25min continuously, reducing the temperature to 800-900 ℃ and keeping the temperature for 20min, and obtaining a die-casting melt at a cooling rate of 3-5 ℃/min;
s4, die casting:
spraying a release agent on the inner cavity of the die-casting mold, injecting the die-casting melt obtained in the step S3 into the die-casting mold, closing the air outlet when the melt flows into the top of the air outlet of the die-casting mold, keeping the injection pressure of the die-casting mold at 30-50MPa, keeping the pressure of the die-casting melt unchanged until the temperature of the internal die-casting melt is 100-200 ℃, taking down the injection part, and opening the mold after the die-casting melt in the die-casting mold is naturally cooled to room temperature to obtain a casting;
s5, polishing the casting:
removing adhesion metal of the liquid injection hole and the exhaust hole on the casting in the step S4 through linear cutting, and manually deburring the casting through a polisher after removal to obtain a primary product casting;
s6, heat treatment:
and (3) placing the primary product 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 product casting.
Further, the Fe powder has a particle size of 55-65 μm, cu powder has a particle size of 45-60 μm, mn powder has a particle size of 15-20 μm, cr powder has a particle size of 25-30 μm, zn powder has a particle size of 40-55 μm, ti powder has a particle size of 8-20 μm, CO powder has a particle size of 5-10 μm, ag powder has a particle size of 10-20 μm, V powder has a particle size of 8-15 μm, and the mixing of the components is better and more uniform when the particle sizes are mixed.
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 silicone, 10-13 parts of petroleum sulfonic acid, 8-15 parts of hydroxy silicone oil, 10-20 parts of grease and 80-100 parts of alcohol, and the release agent has good release effect.
Further, 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, the high-temperature melting furnace is vacuumized through vacuumizing equipment before the AL block is added, the vacuum degree in the high-temperature melting furnace after the vacuumizing is completed is less than or equal to 50mbar, and protective gas is introduced after the vacuumizing is completed until the air pressure in the vacuum furnace is 0.1-0.2Mpa, and oxidation of metal at high temperature is prevented through the protection of the protective gas.
Furthermore, the shielding gas is argon or helium, and the two gases have low cost and good use effect.
Further, the number of grinding wheels used by the grinding machine is 100-300 meshes, the power of the grinding machine is 800-1200W, the grinding efficiency is low due to the fact that the number of the grinding wheels is too large, the grinding surface is rough due to the fact that the number of the grinding wheels is too small, the efficiency is high under the number of the grinding wheels, and the effect is high.
Further, the cutting power of the wire cutting is 3-3.5KW, the thickness of the wire cutting is 0.12-0.2mm, and the wire cutting efficiency is high under the technical parameter.
Further, adding the additive powder in the step S2, and adding a refining agent into the high-temperature melting furnace, 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 consists 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 and 2-7 parts of graphite powder, and the refining agent is beneficial to improving the yield strength of the aluminum alloy.
The beneficial effects of the invention are as follows:
the alloy aluminum alloy is added with Ag, the strength of the aluminum alloy is ensured, and the heat conductivity of the aluminum alloy is improved, and the preparation method for preparing the aluminum alloy is characterized in that other alloy powder is added into melt aluminum, so that the melt aluminum and the alloy powder are mixed uniformly, the heat conductivity coefficient of the aluminum alloy reaches 180W/m.K, the strength of the aluminum alloy reaches more than 400MPa, and the aluminum alloy can be widely popularized in the field of aerospace.
Drawings
FIG. 1 is a flow chart of the preparation of the aluminum alloy material of the present 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, and the balance AL.
Example 2:
embodiment 2 is different from embodiment 1 in that a high-heat-conductivity high-strength die-casting aluminum alloy material is composed 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 being AL.
Example 3:
embodiment 3 is different from embodiment 1 in that a high-heat-conductivity high-strength die-casting aluminum alloy material is composed 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 being AL.
Comparative examples 1-3, the aluminum alloy of example 3 is higher in strength and better in thermal conductivity, so example 3 is the preferred example.
Example 4:
on the basis of the embodiment 3, the embodiment 4 provides a preparation method of a high-heat-conductivity high-strength die-casting aluminum alloy material, which comprises the following steps:
s1, preparing 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 at 120 ℃ at 180r/min for 30min to obtain mixed additive powder;
s2, mixing raw materials:
adding the AL block into a high-temperature melting furnace for heating at 720 ℃ for 30min, obtaining AL liquid after the AL block is completely melted, adding the mixed additive powder obtained in the step S1 into the AL liquid, and obtaining a mixed melt after the addition is completed, wherein the stirring speed is 80r/min along with stirring in the adding process;
the Fe powder has the granularity of 55-65 mu m, the Cu powder has the granularity of 45-60 mu m, the Mn powder has the granularity of 15-20 mu m, the Cr powder has the granularity of 25-30 mu m, the Zn powder has the granularity of 40-55 mu m, the Ti powder has the granularity of 8-20 mu m, the CO powder has the granularity of 5-10 mu m, the Ag powder has the granularity of 10-20 mu m and the V powder has the granularity of 8-15 mu m, and the mixture of the components is better and more uniform under the matching of the granularity; 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:
continuously stirring the mixture at a constant stirring speed in the heating process, wherein the heating speed is 5 ℃/min, keeping the temperature for 30min after the heating is finished, stopping stirring, keeping the temperature for 20min continuously, reducing the temperature to 800 ℃ and keeping the temperature for 20min, and obtaining a die-casting melt;
s4, die casting:
spraying a release agent on the inner cavity of the die-casting mold, injecting the die-casting melt obtained in the step S3 into the die-casting mold, closing the air outlet when the melt flows into the top of the air outlet of the die-casting mold, keeping the injection pressure of the die-casting mold at 30MPa, keeping the pressure of the die-casting mold unchanged until the temperature of the internal die-casting melt is 100 ℃, taking down the liquid injection piece, and opening the mold after the die-casting melt in the die-casting mold is naturally cooled to room temperature to obtain a casting;
the release agent consists of 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 silicone, 10 parts of petroleum sulfonic acid, 8 parts of hydroxy silicone oil, 10 parts of grease and 80 parts of alcohol, and the release agent has good release effect;
s5, polishing the casting:
removing adhesion metal of the liquid injection hole and the exhaust hole on the casting in the step S4 through linear cutting, and manually deburring the casting through a polisher after removal to obtain a primary product casting; the grinding wheel used by the grinding machine has the mesh number of 100 meshes, the power of the grinding machine is 800W, the grinding efficiency is lower when the mesh number is too large, the grinding surface is coarser when the mesh number is too small, and the efficiency and the effect are high when the mesh number is too high.
The cutting power of the wire cutting is 3KW, the thickness of the wire cutting is 0.12mm, and the wire cutting efficiency is high under the technical parameter
S6, heat treatment:
and (3) placing the primary product 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 product casting.
Example 5:
on the basis of the embodiment 3, the embodiment 5 provides a preparation method of a high-heat-conductivity high-strength die-casting aluminum alloy material, which comprises the following steps:
s1, preparing additive powder:
the Fe powder, the Cu powder, the Mn powder, the Cr powder, the Zn powder, the Ti powder, the CO powder, the Ag powder and the V powder are taken according to the mass percentage and are put into a mixer for mixing, the mixing temperature is 150 ℃, the rotating speed of the mixer is 190r/min, the mixing time is 35min, and the mixed additive powder is obtained after the mixing is completed;
s2, mixing raw materials:
adding the AL block into a high-temperature melting furnace for heating at 780 ℃ for 35min, obtaining AL liquid after the AL block is completely melted, adding the mixed additive powder obtained in the step S1 into the AL liquid, and obtaining a mixed melt after the addition is completed, wherein the stirring speed is 90r/min along with stirring in the adding process;
the Fe powder has the granularity of 55-65 mu m, the Cu powder has the granularity of 45-60 mu m, the Mn powder has the granularity of 15-20 mu m, the Cr powder has the granularity of 25-30 mu m, the Zn powder has the granularity of 40-55 mu m, the Ti powder has the granularity of 8-20 mu m, the CO powder has the granularity of 5-10 mu m, the Ag powder has the granularity of 10-20 mu m and the V powder has the granularity of 8-15 mu m, and the mixture of the components is better and more uniform under the matching of the granularity; 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:
continuously stirring the mixture at a constant stirring speed in the heating process to 1400 ℃, keeping the temperature for 35min after the heating is finished at a heating speed of 7 ℃/min, stopping stirring, keeping the temperature for 23min continuously, keeping the temperature at 850 ℃ for 20min, and obtaining a die-casting melt;
s4, die casting:
spraying a release agent on the inner cavity of the die-casting mold, injecting the die-casting melt obtained in the step S3 into the die-casting mold, closing the air outlet when the melt flows into the top of the air outlet of the die-casting mold, keeping the injection pressure of the die-casting mold at 40MPa, keeping the pressure of the die-casting mold unchanged until the internal die-casting melt is cooled to 150 ℃, taking down the liquid injection piece, and opening the mold after the die-casting melt in the die-casting mold is naturally cooled to room temperature to obtain a casting;
the release agent consists of 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 silicone, 11 parts of petroleum sulfonic acid, 10 parts of hydroxy silicone oil, 15 parts of grease and 90 parts of alcohol, and the release agent has good release effect;
s5, polishing the casting:
removing adhesion metal of the liquid injection hole and the exhaust hole on the casting in the step S4 through linear cutting, and manually deburring the casting through a polisher after removal to obtain a primary product casting; the grinding wheel used by the grinding machine has 200 meshes, the power of the grinding machine is 1000W, the grinding efficiency is lower when the number of the grinding wheels is too large, the grinding surface is rough when the number of the grinding wheels is too small, and the efficiency and the effect are high when the number of the grinding wheels is too high.
The cutting power of the wire cutting is 3.3KW, the thickness of the wire cutting is 0.15mm, and the wire cutting efficiency is high under the technical parameter
S6, heat treatment:
and (3) placing the primary product 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 product casting.
Example 6:
on the basis of the embodiment 3, the embodiment 6 provides a preparation method of a high-heat-conductivity high-strength die-casting aluminum alloy material, which comprises the following steps:
s1, preparing 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 at 180 ℃ at 200r/min for 40min to obtain mixed additive powder;
s2, mixing raw materials:
adding the AL block into a high-temperature melting furnace for heating at 800 ℃ for 40min, obtaining AL liquid after the AL block is completely melted, adding the mixed additive powder obtained in the step S1 into the AL liquid, and obtaining a mixed melt after the addition is completed, wherein the stirring speed is 100r/min along with stirring in the adding process;
the Fe powder has the granularity of 55-65 mu m, the Cu powder has the granularity of 45-60 mu m, the Mn powder has the granularity of 15-20 mu m, the Cr powder has the granularity of 25-30 mu m, the Zn powder has the granularity of 40-55 mu m, the Ti powder has the granularity of 8-20 mu m, the CO powder has the granularity of 5-10 mu m, the Ag powder has the granularity of 10-20 mu m and the V powder has the granularity of 8-15 mu m, and the mixture of the components is better and more uniform under the matching of the granularity; 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:
continuously stirring the mixture at a constant stirring speed in the heating process, wherein the heating speed is 8 ℃/min, keeping the constant temperature for 40min after the heating is finished, stopping stirring, keeping the constant temperature for 25min, keeping the temperature at 900 ℃ for 20min, and obtaining a die-casting melt;
s4, die casting:
spraying a release agent on the inner cavity of the die-casting mold, injecting the die-casting melt obtained in the step S3 into the die-casting mold, closing the air outlet when the melt flows into the top of the air outlet of the die-casting mold, keeping the injection pressure of the die-casting mold at 50MPa, keeping the pressure of the die-casting mold unchanged until the temperature of the internal die-casting melt is 200 ℃, taking down the liquid injection piece, and opening the mold after the die-casting melt in the die-casting mold is naturally cooled to room temperature to obtain a casting;
the release agent consists of 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 silicone, 13 parts of petroleum sulfonic acid, 15 parts of hydroxy silicone oil, 20 parts of grease and 100 parts of alcohol, and the release agent has good release effect;
s5, polishing the casting:
removing adhesion metal of the liquid injection hole and the exhaust hole on the casting in the step S4 through linear cutting, and manually deburring the casting through a polisher after removal to obtain a primary product casting; the grinding wheel used by the grinding machine has 300 meshes, the power of the grinding machine is 1200W, the grinding efficiency is lower when the number of the grinding wheels is too large, the grinding surface is rough when the number of the grinding wheels is too small, and the efficiency and the effect are high when the number of the grinding wheels is too high.
The cutting power of the wire cutting is 3.5KW, the thickness of the wire cutting is 0.2mm, and the wire cutting efficiency is high under the technical parameter
S6, heat treatment:
and (3) placing the primary product 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 product casting.
Comparative example 4-example 6 is the most efficient and best quality for preparing aluminum alloys, and thus example 6 is the best example.
Example 7:
on the basis of example 6, the difference between example 7 and example 6 is that the high temperature melting furnace is vacuumized by a vacuuming device before the AL block is added, the vacuum degree in the high temperature melting furnace is 50mbar after the vacuuming is completed, and protective gas is introduced to the vacuum furnace until the air pressure is 0.1Mpa after the vacuuming is completed, and the oxidation of metal at high temperature is prevented by the protection of the protective gas; the shielding gas is argon or helium, the cost of the two gases is low, and the use effect is good.
Example 8:
on the basis of the embodiment 6, the embodiment 8 is different from the embodiment 6 in that the high-temperature melting furnace is vacuumized by a vacuuming device before being added into the AL block, the vacuum degree in the high-temperature melting furnace is 40mbar after vacuuming, and protective gas is introduced to the vacuum furnace until the air pressure is 0.5Mpa after vacuuming, and oxidation of metal at high temperature is prevented by the protection of the protective gas; the shielding gas is argon or helium, the cost of the two gases is low, and the use effect is good.
Example 9:
on the basis of example 6, the difference between example 9 and example 6 is that the high temperature furnace is vacuumized by a vacuuming device before the AL block is added, the vacuum degree in the high temperature furnace is 30mbar after the vacuuming is completed, and protective gas is introduced to the vacuum furnace until the air pressure is 0.2Mpa after the vacuuming is completed, and the oxidation of metal at high temperature is prevented by the protection of the protective gas; the shielding gas is argon or helium, the cost of the two gases is low, and the use effect is good.
Comparative example 7-example 9 the aluminum alloy prepared in example 9 is the most excellent in quality, strength and thermal conductivity, and thus example 9 is the best example.
Example 10:
on the basis of example 9, example 10 is different from example 9 in that example 10 adds a refining agent to a high temperature melting furnace while adding additive powder in step S2, the addition amount of the refining agent is 0.5% of the total mass of aluminum alloy raw materials, and the refining agent is composed 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 and 2-7 parts of graphite powder, and the refining agent is beneficial to improving the yield strength of the aluminum alloy.
Example 11:
on the basis of example 9, example 11 is different from example 9 in that example 11 is added with a refining agent to a high temperature melting furnace while adding additive powder in step S2, the addition amount of the refining agent is 0.6% of the total mass of aluminum alloy raw materials, and the refining agent is composed 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 and 3 parts of graphite powder, and the refining agent is beneficial to improving the yield strength of the aluminum alloy.
Example 12:
on the basis of example 9, example 12 is different from example 9 in that example 12 is added with a refining agent to a high temperature melting furnace while adding additive powder in step S2, the addition amount of the refining agent is 0.8% of the total mass of aluminum alloy raw materials, and the refining agent is composed 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.
In comparative examples 10 to 12, the refining agent in example 12 was added optimally, and the aluminum alloy produced was the highest in strength and the thermal conductivity, so that example 12 was the best example.
Claims (4)
1. The die-casting aluminum alloy material with high heat conduction 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, and the balance Al;
the preparation method of the high-heat-conductivity high-strength die-casting aluminum alloy material comprises the following steps:
s1, preparing 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 at 120-180 deg.c at 180-200r/min for 30-40min to obtain mixed additive powder;
s2, mixing raw materials:
adding the Al blocks into a high-temperature melting furnace for heating at 720-800 ℃ for 30-40min, obtaining Al liquid after the Al blocks are completely melted, adding the mixed additive powder obtained in the step S1 into the Al liquid, and stirring at a stirring speed of 80-100r/min during the adding process to obtain a mixed melt after the adding is completed;
s3, heating and smelting:
continuously stirring the mixture at a constant stirring speed of 5-8 ℃/min in the heating process when the temperature in the high-temperature melting furnace is raised to 1250-1500 ℃, keeping the constant temperature for 30-40min after the temperature is raised, stopping stirring, keeping the constant temperature for 20-25min continuously, reducing the temperature to 800-900 ℃ and keeping the temperature for 20min, and obtaining a die-casting melt at a cooling rate of 3-5 ℃/min;
s4, die casting:
spraying a release agent on the inner cavity of the die-casting mold, injecting the die-casting melt obtained in the step S3 into the die-casting mold, closing the air outlet when the melt flows into the top of the air outlet of the die-casting mold, keeping the injection pressure of the die-casting mold at 30-50MPa, keeping the pressure of the die-casting melt unchanged until the temperature of the internal die-casting melt is 100-200 ℃, taking down the injection part, and opening the mold after the die-casting melt in the die-casting mold is naturally cooled to room temperature to obtain a casting;
s5, polishing the casting:
removing adhesion metal of the liquid injection hole and the exhaust hole on the casting in the step S4 through linear cutting, and manually deburring the casting through a polisher after removal to obtain a primary product casting;
s6, heat treatment:
placing the primary product 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 product casting;
the Fe powder has a granularity of 55-65 mu m, the Cu powder has a granularity of 45-60 mu m, the Mn powder has a granularity of 15-20 mu m, the Cr powder has a granularity of 25-30 mu m, the Zn powder has a granularity of 40-55 mu m, the Ti powder has a granularity of 8-20 mu m, the Co powder has a granularity of 5-10 mu m, the Ag powder has a granularity of 10-20 mu m, and the V powder has a granularity of 8-15 mu m;
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 silicone, 10-13 parts of petroleum sulfonic acid, 8-15 parts of hydroxy silicone oil, 10-20 parts of grease and 80-100 parts of alcohol;
the granularity of the Al blocks is 3-5cm;
vacuumizing the high-temperature melting furnace through vacuumizing equipment before the Al blocks are added, wherein the vacuum degree in the high-temperature melting furnace is less than or equal to 50mbar after vacuumizing is finished, and introducing protective gas until the air pressure in the vacuum furnace is 0.1-0.2MPa.
2. The method for preparing a high-heat-conductivity and high-strength die-casting aluminum alloy material according to claim 1, wherein the shielding gas is argon or helium.
3. The method for preparing the die-casting aluminum alloy material with high heat conductivity and high strength according to claim 1, wherein the grinding wheel mesh number of the grinding machine is 100-300 meshes, and the grinding machine power is 800-1200W.
4. The method for preparing the high-heat-conductivity high-strength die-casting aluminum alloy material according to claim 1, wherein the cutting power of wire cutting is 3-3.5KW, and the thickness of the wire cutting is 0.12-0.2mm.
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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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| CN111719071A (en) * | 2020-07-13 | 2020-09-29 | 珠海市润星泰电器有限公司 | High-thermal-conductivity high-strength aluminum-based composite material for die casting and preparation method thereof |
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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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