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CN-121976081-A - Manufacturing method of high-strength and high-toughness composite aluminum alloy hub

CN121976081ACN 121976081 ACN121976081 ACN 121976081ACN-121976081-A

Abstract

The invention belongs to the technical field of aluminum-based alloy treatment, and particularly relates to a manufacturing method of a high-strength and high-toughness composite aluminum alloy hub, which comprises the following steps of dispersing aluminum powder and magnesium powder in ethanol solution of PVP-K30 under the protection of inert atmosphere, adding PEG-1000, uniformly mixing, concentrating to obtain aluminum-magnesium particle suspension, dispersing TiC in PEG-6000 water solution, adding Ce (NO 3 ) 3 ·6H 2 O, uniformly mixing, adding (NH 4 ) 2 C 2 O 4 for reaction, adding aluminum-magnesium particle suspension, uniformly mixing to obtain slurry, granulating, placing in inert atmosphere, performing heat treatment, cooling to obtain composite particles, melting aluminum ingots into aluminum liquid, adding a refiner and the composite particles into the aluminum liquid, obtaining melt, pouring into a mould, and performing molding treatment and strengthening treatment to obtain the aluminum alloy hub.

Inventors

  • ZHOU LIGANG
  • GAO CHAO
  • LIAN MEILI
  • XING FENG
  • WANG MINGZHI
  • YANG WENLIANG

Assignees

  • 河南三维重工有限公司
  • 河南恒久制动系统有限公司

Dates

Publication Date
20260505
Application Date
20260408

Claims (10)

  1. 1. The manufacturing method of the high-strength and high-toughness composite aluminum alloy hub is characterized by comprising the following steps of: S1, dispersing aluminum powder and magnesium powder in an ethanol solution of PVP-K30 under the protection of inert atmosphere, adding PEG-1000, uniformly mixing, and concentrating to obtain aluminum-magnesium particle suspension; s2, dispersing TiC in a PEG-6000 water solution, adding Ce (NO 3 ) 3 ·6H 2 O, mixing uniformly, adding (NH 4 ) 2 C 2 O 4 for reaction, adding aluminum-magnesium microparticle suspension, mixing uniformly to obtain slurry, granulating, placing in an inert atmosphere, performing heat treatment, and cooling to obtain composite microparticles; s3, melting the aluminum ingot into aluminum liquid, adding a refiner and composite particles into the aluminum liquid to obtain a melt, pouring the melt into a mold, and obtaining the aluminum alloy hub after molding treatment and strengthening treatment.
  2. 2. The method for manufacturing the high-strength and high-toughness composite aluminum alloy hub according to claim 1, wherein before the magnesium powder and the aluminum powder are dispersed in an ethanol solution of PVP-K30, the magnesium powder is dispersed in an aqueous solution of 1-2wt% citric acid under the protection of nitrogen for activation treatment for 1-2min, filtering, washing with deionized water and absolute ethanol, the aluminum powder is dispersed in the deionized water under the protection of nitrogen, and after the pH value is adjusted to 2-3, the magnesium powder and the aluminum powder are subjected to activation treatment for 10-15s, filtering, washing with deionized water and absolute ethanol.
  3. 3. The method for manufacturing the high-strength and high-toughness composite aluminum alloy hub according to claim 2, wherein in the step S1, activated aluminum powder and activated magnesium powder are dispersed in ethanol solution of 1-1.5wt% PVP-K30 under the protection of nitrogen, PEG-1000 is added and mixed uniformly, and the mixture is placed in an environment of 40-50 ℃ and 5-8kPa for stirring and concentrating for 40-50min, so that aluminum-magnesium particle suspension is obtained.
  4. 4. The method for manufacturing the high-strength and high-toughness composite aluminum alloy hub according to claim 3, wherein the aluminum-magnesium particle suspension comprises, by mass, 100-110 parts of aluminum powder, 3-4 parts of magnesium powder, 600-650 parts of 1-1.5wt% PVP-K30 ethanol solution and 1.6-1.9 parts of PEG-1000.
  5. 5. The method for manufacturing the high-strength and high-toughness composite aluminum alloy hub according to claim 1, wherein in the step S2, tiC is dispersed in a 2-2.5wt% PEG-6000 aqueous solution, ce (NO 3 ) 3 ·6H 2 O is added, mixed uniformly, added (NH 4 ) 2 C 2 O 4 is reacted for 25-30min, aluminum-magnesium particle suspension is added, mixed uniformly) to obtain slurry, spray granulation is carried out on the slurry under the conditions of an air inlet temperature of 180-190 ℃ and an air outlet temperature of 85-90 ℃ to obtain a composite particle precursor, the composite particle precursor is placed in an argon atmosphere, heated to 150-160 ℃ for 2-3h, heated to 300-310 ℃ for 2-3h, heated to 500-505 ℃ for 2-3h, heated to 678-682 ℃ for 40-50min, cooled and then transferred to an air atmosphere to obtain the composite particle.
  6. 6. The method for manufacturing a high-strength and high-toughness composite aluminum alloy hub according to claim 5, wherein the composite particles comprise, by mass, 200-210 parts of TiC, 1500-1600 parts of 2-2.5wt% PEG-6000 aqueous solution, 8-10 parts of Ce (NO 3 ) 3 ·6H 2 O, (NH 4 ) 2 C 2 O 4 -5 parts), and 300-310 parts of aluminum-magnesium particle suspension.
  7. 7. The method for manufacturing a high-strength and high-toughness composite aluminum alloy hub according to claim 1, wherein in the step S2, siC and TiC are dispersed in a PEG-6000 aqueous solution, and the composite particles comprise, by mass, 200-210 parts of TiC, 0-25 parts of SiC, 1500-1600 parts of a 2-2.5wt% PEG-6000 aqueous solution, 8-10 parts of Ce (NO 3 ) 3 ·6H 2 O, (NH 4 ) 2 C 2 O 4 -5 parts), and 300-310 parts of an aluminum-magnesium particle suspension.
  8. 8. The method for manufacturing the high-strength and high-toughness composite aluminum alloy hub according to claim 1, wherein in the step S3, an aluminum ingot is placed in an argon atmosphere, the temperature is raised to 750-760 ℃, the temperature is kept for 35-45min, a refiner Al-Ti-C is added for uniform mixing, the mixture is kept stand for 8-10min, a refiner Al-Sr is added for uniform mixing, the mixture is kept stand for 3-5min, the temperature is reduced to 710-715 ℃, and composite particles preheated to 250-300 ℃ are added for uniform mixing, so that a melt is obtained.
  9. 9. The method for manufacturing the high-strength and high-toughness composite aluminum alloy hub according to claim 8, wherein in the step S3, a melt is poured into a mold, a pressure of 60-65MPa is applied until the melt solidifies, the melt is cooled to 250-260 ℃ after pressure relief, a hub blank is obtained after demoulding, the hub blank is placed in a 560-570 ℃ environment for solution treatment for 2-3h, quenched in 60-70 ℃ water for quenching treatment, and is placed in a 175-180 ℃ environment for aging treatment for 8-10h after being taken out, so that the aluminum alloy hub is obtained.
  10. 10. The method for manufacturing a high-strength and high-toughness composite aluminum alloy hub according to claim 8, wherein the mass of the Al-Ti-C is 0.2% -0.3% of the mass of the aluminum ingot, the mass of the Al-Sr is 0.1% -0.2% of the mass of the aluminum ingot, and the mass of the composite particles is 1.1% -1.2% of the mass of the aluminum ingot.

Description

Manufacturing method of high-strength and high-toughness composite aluminum alloy hub Technical Field The invention belongs to the technical field of aluminum-based alloy treatment, and particularly relates to a manufacturing method of a high-strength and high-toughness composite aluminum alloy hub. Background With the development of new energy automobiles and the increase of automobile light-weight demands, aluminum alloy hubs are applied on a large scale due to high strength and good heat dissipation. In the manufacturing process of the aluminum alloy hub, tiC is often dispersed in an aluminum liquid as a reinforcing phase to improve the tensile strength and yield strength of the aluminum alloy hub due to high modulus and high hardness, but is difficult to uniformly disperse therein due to poor wettability of the aluminum liquid to TiC, and agglomeration is easy to occur, thereby limiting the exertion of the reinforcing effect thereof. The Chinese patent document with publication number CN120464898B discloses an Al-Ti-C-Ce intermediate alloy taking titanium carbide as a Ti source and a C source, a preparation method and application thereof, titanium carbide powder and aluminum powder are mixed and ball milled to obtain core-shell structure composite powder of Al coated TiC, the core-shell structure composite powder is pressed and molded to obtain prefabricated blocks, the prefabricated blocks are pressed into the bottom of aluminum liquid in batches through a graphite bell jar, first heat preservation is carried out at 760-850 ℃, then the temperature is reduced to 700-750 ℃, then Al-30Ce intermediate alloy is added, second heat preservation is carried out, slag removal refining is carried out, and then the prefabricated blocks are poured into a die. In the above patent, the compatibility between the composite powder and the aluminum liquid is improved by coating the Al outside TiC, but the wettability between TiC and the aluminum liquid is poor, the Al coating only improves the compatibility between the whole composite powder and the aluminum liquid, the thermodynamic non-wetting nature of the TiC and Al interface is not fundamentally changed, and after TiC particles are re-exposed in the aluminum liquid, the high interface can rapidly induce particle agglomeration, so that the dispersing effect is weakened. Disclosure of Invention The invention provides a manufacturing method of a high-strength and high-toughness composite aluminum alloy hub, which comprises the steps of adding TiC-containing composite particles into aluminum liquid, promote TiC to be rapidly and uniformly dispersed in the aluminum liquid, and improve the toughness of the aluminum alloy hub. In order to solve the problems, the invention adopts the following technical scheme: a manufacturing method of a high-strength and high-toughness composite aluminum alloy hub comprises the following steps: S1, dispersing aluminum powder and magnesium powder in an ethanol solution of PVP-K30 under the protection of inert atmosphere, adding PEG-1000, uniformly mixing, and concentrating to obtain aluminum-magnesium particle suspension; s2, dispersing TiC in a PEG-6000 water solution, adding Ce (NO 3)3·6H2 O, mixing uniformly, adding (NH 4)2C2O4 for reaction, adding aluminum-magnesium microparticle suspension, mixing uniformly to obtain slurry, granulating, placing in an inert atmosphere, performing heat treatment, and cooling to obtain composite microparticles; s3, melting the aluminum ingot into aluminum liquid, adding a refiner and composite particles into the aluminum liquid to obtain a melt, pouring the melt into a mold, and obtaining the aluminum alloy hub after molding treatment and strengthening treatment. In the invention, composite particles are added into aluminum liquid to be used as reinforcing phase. In the preparation process of the composite particles, ce (NO 3)3·6H2 O and (NH 4)2C2O4) react to generate Ce 2(C2O4)3 precipitate and adhere to the surface of TiC to obtain TiC@Ce 2(C2O4)3, then the TiC@Ce 2(C2O4)3 and the aluminum magnesium particles are granulated together, in the subsequent heat treatment process, ce 2(C2O4)3 is converted into CeO 2 to obtain TiC@CeO 2, and the aluminum magnesium particles are melted to form aluminum magnesium alloy liquid and are coated on the surface of TiC@CeO 2 to form a magnesium-aluminum-containing layer, so that the composite particles are obtained. The composite particles are added into aluminum liquid, then a magnesium-aluminum-containing layer is quickly melted to release TiC@CeO 2, and TiC particles are not easy to agglomerate due to good interface compatibility between CeO 2 and the aluminum liquid, meanwhile, the overall density of the composite particles is close to that of the aluminum liquid due to the existence of the magnesium-aluminum-containing layer, so that sedimentation of the composite particles is effectively slowed down, the distribution uniformity of TiC in a melt is remarkably im