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Method for preparing metal-based composite material

A composite material and metal-based technology, which is applied in the field of non-ferrous metal preparation and processing, can solve the problems of restricting the common use of stirring casting methods, deterioration of mechanical properties of composite materials, and pollution of metal melts, so as to avoid pollution and the loss of the agitator itself , Reduce the preparation cost and facilitate the operation

Active Publication Date: 2010-06-16
有研金属复材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing mechanical stirring methods are mostly exposed to the air, and the contact of the turbulent melt with the air will lead to serious gas absorption in the melt, and will form a large number of oxide inclusions, which will deteriorate the mechanical properties of the composite material; The body is highly corrosive to the agitator, and high-speed agitation will accelerate this corrosion, and the corrosion products will further contaminate the metal melt
Due to this series of reasons, the general use of the stir casting method is limited

Method used

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  • Method for preparing metal-based composite material
  • Method for preparing metal-based composite material
  • Method for preparing metal-based composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Melt 5kg of aluminum alloy 2024 to 650°C and keep it warm; B with an average particle size of 10μm 4 C particles are poured into the crucible 8, the temperature of the melt is controlled to 650°C through the heating furnace 9, and then the smelted 2024 aluminum alloy is quantitatively poured into the crucible, B 4 C particles account for 15% of the total fraction, and 2024 aluminum alloy accounts for 85% of the total fraction. After installing the protective cover 7 and the crucible cover 6, open the N 2 High-pressure gas cylinder, adjust the pressure reducing valve, pulse signal generator and solenoid valve, the air pressure after decompression is 0.6MPa, and the pulse signal frequency is 3Hz. The pulse air flow is ejected from the nozzle to form periodic bubbles. The bubbles drive the SiC particles at the bottom to float up and disperse into the melt. After 5 minutes of pulse air flow treatment, the SiC particles are basically uniformly dispersed, and the uniformly di...

Embodiment 2

[0034] Melt 3kg of magnesium alloy AZ91 to 640°C and keep it warm; after preheating SiC particles with an average particle size of 5μm in the crucible, pour the melted magnesium alloy AZ91 into the crucible quantitatively, and the SiC particles account for 20% of the total fraction 1. Magnesium alloy AZ91 accounts for 80% of the total integral. Argon is used as the pulse air flow. After decompression, the air pressure is 0.3MPa and the pulse frequency is 10Hz. The pulse air flow is ejected from the ring hole nozzle to form periodic bubbles, which form in the melt With strong turbulent flow, SiC particles are gradually dispersed into the melt. After 3 minutes of pulse gas treatment, SiC particles are evenly dispersed into the melt, and then the melt is cooled to obtain a composite material ingot. The angle α / 2 between the centerline of the nozzle air hole and the nozzle centerline is 60°, the protective cover has a conical structure, and the range of the cone angle β is 170°.

Embodiment 3

[0036]Melt 8kg of pure copper to 1200°C and keep it warm; Al with an average particle size of 20μm 2 o 3 After the particles are preheated, they are poured into the crucible 8, and then the smelted copper melt is quantitatively poured into the crucible, and the Al 2 o 3 Particles account for 5% of the total fraction, and pure copper accounts for 95% of the total fraction. After installing the protective cover 7 and crucible cover 6, open the N 2 High-pressure gas cylinder, adjust the pressure reducing valve, pulse signal generator and solenoid valve, the air pressure after decompression is 0.9MPa, and the pulse signal frequency is 30Hz. The pulse air flow is ejected from the nozzle to form periodic bubbles, and the bubbles drive the Al at the bottom 2 o 3 The particles floated up and dispersed into the melt, and after 1min pulsed airflow treatment, the Al 2 o 3 The particle dispersion is basically uniform, and the uniformly dispersed composite material melt is poured int...

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Abstract

The invention relates to a method for preparing a metal-based composite material. The method comprises the following steps of: adding reinforcing particles into a molten metal in a ratio; and transferring impulsive high-pressure inert gas flow to the molten metal by a nozzle, wherein the high-pressure impulsive gas flow forms periodical bubbles in the molten metal and the bubbles are quickly expanded; and a strong vortex flow is formed due to the motion of the impulsive gas flow, so that the reinforcing particles are evenly dispersed in the molten metal. The particle reinforcing metal-based composite material has the advantages of wide material application range, no pollution against the composite materials, low cost, high efficiency and good application prospect.

Description

technical field [0001] The invention relates to a method for preparing a metal-based composite material, in particular to a method for preparing a metal-based composite material by a pulse air flow method, and belongs to the field of non-ferrous metal preparation and processing. Background technique [0002] The development of modern society has higher and higher requirements for materials. For example, in terms of structural materials, materials are often required to have high specific strength and specific stiffness. Composite materials, as a kind of artificially designed materials, can well meet these needs. Composite materials are generally composed of a matrix and a reinforcement. Particle-reinforced metal matrix composites add reinforcing particles to the metal matrix. These reinforcing particles are evenly distributed in the metal matrix to make the material exhibit special properties. At present, a variety of particle-reinforced metal matrix composites have been app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D1/00
Inventor 杨必成徐骏张少明张志峰马跃宇
Owner 有研金属复材技术有限公司
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