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Method for preparing short carbon fiber reinforced magnesium-base composite material with good damping characteristic

A short carbon fiber and composite material technology, applied in the field of functional composite materials, can solve the problems of composite materials such as easy falling off and loss of function, and achieve the effects of good plasticity, low density and excellent damping performance

Inactive Publication Date: 2010-05-12
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most researched coatings that can meet this requirement generally have SiO 2 , SiC, etc., although these coatings can meet the requirements of improving the wettability between carbon and magnesium, but because they are a kind of brittle coating, they are easy to fall off and lose their effect when preparing composite materials.
At present, there are few studies on the use of metal coating on the surface of carbon fiber to improve the wettability between the two, especially the metal coating that can improve both wettability and damping performance has not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation steps of this short carbon fiber reinforced magnesium-based composite material are as follows:

[0020] (1) First remove the organic glue layer on the surface of the short carbon fiber (length-to-diameter ratio: 10-60): heat it under a high-purity nitrogen protective atmosphere to raise the temperature of the glue removal furnace to 450-550°C, and then place the short carbon fiber in the glue removal In the furnace, keep warm for 5-15 minutes to remove the organic glue layer on the surface of the short carbon fiber.

[0021] (2) Deglue the metal nickel layer on the surface of the short carbon fiber in step (1) by the electroless plating method, and the thickness of the nickel layer is greater than 0.2 microns; the specific method is:

[0022] The first step: sensitize and activate the degummed short carbon fiber - place the degummed short carbon fiber in the sensitization solution so that the concentration of the short carbon fiber is 5-7g / l, and the sen...

Embodiment 1

[0031] Example 1: T300 type short carbon fiber (aspect ratio 10-60) is used as reinforcement, and -100 mesh magnesium powder (purity ≥ 99.8%) is used as matrix. Under the protection of nitrogen atmosphere, the degumming was heated at 450°C for 15 minutes. The electroless plating process uses nickel sulfate as nickel source 20g / l, sodium hypophosphite as reducing agent 30g / l, sodium citrate as complexing agent 40g / l, ammonium chloride as additive (50g / l), at a temperature of 60°C , deposited under alkaline conditions with a pH value of 8 for 5 minutes, and an electroless nickel layer with a thickness of 0.3 μm was obtained on the carbon fiber surface. The composite material was prepared by powder metallurgy method, the volume fraction of coated short carbon fiber was 3%, the volume fraction of magnesium powder was 97%, the ball-material ratio was 2:1, the speed was 100 rpm, the powder was mixed for 6 hours, and cold-pressed at 500MPa , hold the pressure for 5 minutes, sinter a...

Embodiment 2

[0032] Example 2: T300 type short carbon fiber (aspect ratio 10-60) is used as reinforcement, and -100 mesh magnesium powder (purity ≥ 99.8%) is used as matrix. Under the protection of nitrogen atmosphere, the degumming was heated at 550°C for 5 minutes. The electroless plating process uses nickel sulfate as nickel source 40g / l, sodium hypophosphite as reducing agent 20g / l, sodium citrate as complexing agent 40g / l, ammonium chloride as additive (50g / l), at a temperature of 80°C , deposited under alkaline conditions with a pH value of 10 for 5 minutes, and an electroless nickel layer with a thickness of 0.8 μm was obtained on the carbon fiber surface. The composite material is prepared by powder metallurgy method, the volume fraction of coated short carbon fiber is 10%, the volume fraction of magnesium powder is 90%, the ball-to-material ratio is 2:1, the speed is 400 rpm, the powder is mixed for 3 hours, and cold-pressed at 550MPa , hold the pressure for 1 minute, sinter at 6...

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Abstract

The invention relates to a method for preparing a carbon fiber reinforced magnesium-base composite material with a good damping characteristic, which comprises the following steps: (1) removing organic rubber layers on the surfaces of short carbon fibers; (2) depositing metallic nickel coating layers through chemical plating, and obtaining the coating layers with required thicknesses by controlling the deposition time under an alkaline condition; and (3) after preparing the short carbon fibers of which the surfaces are plated with the metallic nickel coating layers, preparing the carbon fiber reinforced magnesium-base composite material with the good damping characteristic by adopting a powder metallurgic method. In the method, 3 to 20 percent (volume percentage) of chemical nickel plating short carbon fibers are added into a magnesium base, so a matrix is improved, and the matrix is endowed with a better damping characteristic; the material has a lower density compared with that the conventional damping alloy material and the better damping characteristic compared with that of pure magnesium, and the damping performance of the material can reach a high damping range of 0.015.

Description

technical field [0001] The invention relates to a preparation method of a short carbon fiber reinforced magnesium-based composite material with excellent damping properties, specifically, a metal-based composite material with pure magnesium as a matrix and surface metallized short carbon fibers as a reinforcement, belonging to functional composites field of materials technology. Background technique [0002] Damping, also known as internal friction, refers to the phenomenon that the mechanical vibration energy is consumed due to the characteristics of the internal structure when the material is excited by vibration. Damping performance is usually also called vibration damping performance, and is often characterized by internal friction value Q-1. In the field of aerospace, all kinds of aircraft will vibrate due to the strong excitation of the engine and high-speed airflow during flight, and the structural fatigue will be caused by the resonance response. This often leads t...

Claims

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Application Information

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IPC IPC(8): C22C47/14C22C47/04C22C49/04C22C49/14C22C101/10
Inventor 高家诚任富忠谭尊
Owner CHONGQING UNIV
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