Forming method for nano particle reinforced aluminum-based composite material

A composite material and enhanced aluminum-based technology, which is applied in the field of metal casting and forming, can solve the problems of uneven dispersion of nano-ceramic particles, easy agglomeration, and difficulty in filling, achieving efficient and simple process and forming method, high content, and improved mechanical properties. Effect

Active Publication Date: 2018-01-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In view of the above defects or improvement needs of the prior art, the present invention provides a die-casting method for composite material slurry containing nano-ceramic particles, the purpose of which is to provide a new type of nano-particle reinforced aluminum matrix composite The die-casting forming method solves the problems of difficult filling, uneven dispersion and easy agglomeration of nano-ceramic particles when preparing high-quality nano-ceramic particle-reinforced aluminum matrix composites

Method used

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  • Forming method for nano particle reinforced aluminum-based composite material
  • Forming method for nano particle reinforced aluminum-based composite material
  • Forming method for nano particle reinforced aluminum-based composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Step 1: Weigh nano-SiC powder with an average particle size of 40nm and a purity greater than 99.9% and Al-Cu alloy powder with an average particle size of 70 μm and a purity greater than or equal to 99.85%, wherein the nano-SiC powder accounts for 3% of the total weight. Dry and oxidize the nano-SiC powder before batching. The drying temperature is 150°C for 1 hour, and then the temperature in the heating furnace is raised to 1000°C for 2 hours of oxidation.

[0053] The second step: put the mixed powder into a sealed tank, vacuumize and pass argon. The sealed tank was placed on a rolling mixer and mechanically stirred and mixed for 10 hours to prepare a composite powder with uniform distribution of nano-ceramic particles.

[0054] Step 3: Put the composite powder into a hot-press sintering furnace and heat-press it into a prefabricated block with a pressure of 10 MPa and a pressing temperature of 400°C. A block of about 150 g is made by using a custom-made graphite m...

Embodiment 2

[0061] Step 1: Weigh nano-SiC powder with an average particle size of 100nm and a purity greater than 99.9% and Al powder with an average particle size of 200 μm and a purity greater than or equal to 99.85%, wherein the nano-SiC powder accounts for 10% of the total weight. Dry and oxidize the nano-SiC powder before batching. The drying temperature is 110°C for 1 hour, and then the temperature in the heating furnace is raised to 1000°C for 2 hours of oxidation.

[0062] The second step: put the mixed powder into a sealed tank, vacuumize and pass argon. The sealed tank was placed on a rolling mixer and mechanically stirred and mixed for 20 hours to prepare a composite powder with uniform distribution of nano-ceramic particles.

[0063] Step 3: Put the composite powder into a hot-pressed sintering furnace for hot pressing (30MPa, 500°C) to form a prefabricated block, and use a customized graphite mold to make a block of about 200g.

[0064] Step 4: Put the crucible with the pre...

Embodiment 3

[0070] Step 1: Weigh nano-Al with an average particle size of 10nm and a purity greater than 99.9% 2 o 3 powder and Al-Si powder with an average particle size of 70 μm and a purity greater than or equal to 99.85%, in which nano-Al 2 o 3 Powder accounted for 5% of the total weight. Nano-Al 2 o 3 powder to dry. Dry at 140°C for 1 hour.

[0071] The second step: put the mixed powder into a sealed tank, vacuumize and pass argon. The sealed tank was placed on a rolling mixer and mechanically stirred and mixed for 15 hours to prepare a composite powder with uniform distribution of nano-ceramic particles.

[0072] Step 3: Put the composite powder into a hot-pressed sintering furnace for hot pressing (20MPa, 450°C) into a prefabricated block, and use a customized graphite mold to make a block of about 150g.

[0073] Step 4: Put the crucible with the prefabricated block into a high temperature resistance furnace to melt at about 740°C and keep it warm for 20 minutes.

[0074] ...

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Abstract

The invention discloses a forming method for a nano particle reinforced aluminum-based composite material and belongs to the field of metal casting forming. Nano ceramic powder and micro size aluminumpowder or aluminum alloy powder are prepared into mixed powder with the nano ceramic particle content being 3-10%, the mixed powder is mechanically mixed into composite powder in a seal tank under argon protection, and the composite powder is hot-pressed into prefabricated blocks with the quality being about 150-200 g. The prefabricated blocks are melted after reaching about 750 DEG C, then mechanical stirring is conducted, and then high-energy supersonic vibration is conducted. Through ultra-low-speed laminar flow pressure casting, a composite material melt is pressed into a mold cavity of amold, mold opening is conducted for piece taking-out, and a nano ceramic particle reinforced aluminum-based composite material part with the mass fraction being 3-10% is obtained. According to the forming method for the nano particle reinforced aluminum-based composite material, the forming technique is simple and easy to achieve, the effect is good, and the problems that in casting, a ceramic particle reinforced aluminum-based composite material with the high mass fraction is large in viscosity and poor in liquidity, and ceramic particles are easy gathered are solved.

Description

technical field [0001] The invention belongs to the field of metal casting and forming, and more specifically relates to a laminar flow die-casting process and a forming method for preparing a high-quality nano-ceramic particle-reinforced aluminum-based composite material. Background technique [0002] Nano-ceramic particle-reinforced aluminum matrix composites have more excellent properties than traditional aluminum alloy materials, and have broad application prospects in many fields such as aerospace and automobiles, and are currently a hot spot of attention and research. [0003] At present, the nanoparticle content of the usually prepared nanoparticle-reinforced aluminum matrix composites is between 0% and 3%, and problems such as agglomeration, oxidation slag inclusion, high viscosity and difficult filling are prone to occur during the preparation process. In order to overcome the above problems, die casting methods are often used. [0004] High pressure and high speed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/02C22C21/00C22C32/00B22D17/00
Inventor 吴树森鲁康吕书林袁渡
Owner HUAZHONG UNIV OF SCI & TECH
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