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Method for preparing short carbon fiber enhanced metal-based composite material through combination of machine and electromagnetic stirring

A short carbon fiber, electromagnetic stirring technology

Active Publication Date: 2018-09-28
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the single flow field inside the melt and the single fiber distribution and orientation in the existing liquid mechanical stirring method, and provide a simple and efficient preparation method for realizing multi-orientation dispersion of fibers in the melt

Method used

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  • Method for preparing short carbon fiber enhanced metal-based composite material through combination of machine and electromagnetic stirring

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The carbon fiber is cut into chopped carbon fiber, and the length of the carbon fiber is 1 mm to obtain a short carbon fiber reinforcement. Under vacuum conditions, the chopped carbon fibers were added to the aluminum melt in the crucible melted by a high-frequency induction melting furnace with an output frequency of 500 kHz and an output power of 5 kW, and kept warm for 2 minutes. The crucible is a magnesia non-axisymmetric crucible with good magnetic permeability. Without turning off the power to the induction melting furnace, mechanical agitation is applied to the aluminum melt. The shape of the stirring paddle is a multi-layer paddle, the rotating speed of the stirring paddle is 1500r / min, and the mechanical stirring is carried out for 2 minutes. After the mixing and dispersing is completed, it is cooled. The short carbon fibers are evenly distributed in the matrix and present a multi-orientation distribution state.

[0036] Such as figure 1 As shown, the black ...

Embodiment 2

[0038] The carbon fiber is cut into chopped carbon fiber, and the length of the carbon fiber is 8 mm to obtain a short carbon fiber reinforcement. Under inert gas protection conditions, the chopped carbon fibers were added to the aluminum melt in the crucible melted by an intermediate frequency induction melting furnace with an output frequency of 50 Hz and an output power of 50 kW, and kept warm for 10 minutes. The crucible is a corundum axisymmetric crucible with good magnetic permeability. Without turning off the power to the induction melting furnace, mechanical agitation is applied to the aluminum melt. The shape of the stirring paddle is a single-layer slurry, the rotating speed of the stirring paddle is 400r / min, and the mechanical stirring is carried out for 60 minutes. After the mixing and dispersing is completed, it is cooled. The short carbon fibers are evenly distributed in the matrix and present a multi-orientation distribution state.

Embodiment 3

[0040] Cut the carbon fiber into chopped carbon fiber, the length of the carbon fiber is 4mm, and obtain the short carbon fiber reinforcement;

[0041] Use an induction melting furnace to melt the zinc alloy matrix, so that the metal alloy matrix in the crucible becomes a zinc alloy melt; the output frequency of the induction melting furnace is 100kHz, and the output power is 5kW; the crucible is a mullite axisymmetric crucible with good magnetic permeability ;

[0042] Add the short carbon fiber reinforcement to the zinc alloy melt in the crucible under the protection of inert gas, and keep it warm for 10 minutes;

[0043] Do not turn off the power supply of the induction melting furnace, apply mechanical stirring to the zinc alloy melt in the crucible; the shape of the stirring paddle is a single-layer slurry, and the speed of the stirring paddle is 1000r / min;

[0044] Stir mechanically for 30 minutes, and cool down after mixing and dispersing.

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Abstract

The invention relates to the technical field of metal-based composite materials, in particular to a method for preparing a short carbon fiber enhanced metal-based composite material through combination of a machine and electromagnetic stirring. The preparation method is also applicable to preparation of aluminum alloy, zinc alloy, cast iron and other carbon fiber enhanced metal-based composite materials. The problems that after melt in a crucible is stable in the prior art, a single flow field exists in the crucible, nonuniform fiber dispersion and single fiber distribution orientation are likely to occur, and dead areas exist in the melt are solved. The machine and electromagnetic stirring are combined to prepare the short carbon fiber enhanced metal-based composite material, the flow field in the melt becomes complex through the synthetic effect between electromagnetism and mechanical stirring, and therefore multi-direction dispersion of fiber is achieved.

Description

technical field [0001] The invention belongs to the technical field of metal-matrix composite materials, and in particular relates to a method for preparing short carbon fiber reinforced metal-matrix composite materials by mechanically combining electromagnetic stirring. Background technique [0002] Carbon fiber reinforced metal matrix composites have been used in the aerospace field due to their excellent properties such as low density, high strength, and good thermal properties. However, whether as a structural material or as a functional material, the dispersion of short carbon fiber reinforcements in the matrix seriously affects the performance of composite materials and limits the application of short carbon fiber reinforced aluminum matrix composites. [0003] At present, the preparation of short carbon fiber reinforced aluminum matrix composites is mainly powder metallurgy, semi-solid method and liquid stirring method. However, the semi-solid and powder metallurgy m...

Claims

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Application Information

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IPC IPC(8): C22C47/08C22C49/14C22C101/10
CPCC22C47/08C22C49/14
Inventor 曲迎东李广龙周启文陈兴旺刘希仕王光磊李荣德尤俊华
Owner SHENYANG POLYTECHNIC UNIV
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