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Preparation method of zinc oxide particle strengthened aluminum-based composite

A technology of zinc oxide particles and aluminum matrix reinforcement, applied in the direction of metal rolling, etc., can solve the problems affecting the mechanical and electrical properties of metal matrix composites, the limitation of the volume fraction of the reinforcement, and the easy occurrence of pores in the sample, and achieve good interface bonding. , Low thermal expansion coefficient, easy operation effect

Active Publication Date: 2017-01-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the casting method and powder metallurgy method, the strengthening particles usually tend to agglomerate, resulting in uneven distribution, and the sample is prone to defects such as pores and cracks, which greatly affects the mechanical and electrical properties of the prepared metal matrix composites.
In situ synthesis can solve the above problems, but when using in situ synthesis, the volume fraction of the enhancer is limited

Method used

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  • Preparation method of zinc oxide particle strengthened aluminum-based composite
  • Preparation method of zinc oxide particle strengthened aluminum-based composite
  • Preparation method of zinc oxide particle strengthened aluminum-based composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: 2.5 vol.% of nano-zinc oxide is sandwiched between pure aluminum that has been completely annealed, deoxidized film, and degreasing, and then continuously accumulated for 4, 8, 12 passes under the condition of no lubrication at room temperature Rolling. In this embodiment, the aluminum content of the pure aluminum plate is 99.99%, the size is: 100×20×0.25 mm; the size of the zinc oxide particles is 248 nm. The industrial rolling mill is adopted, and the rolling speed is 187mm / min. During each rolling pass, the reduction in the thickness direction of the sample is 50%. The fully annealed pure aluminum sheet is subjected to surface treatments such as deoxidation and degreasing. After the weighed nano-ZnO particles are ultrasonically shaken in acetone, they are evenly coated on the surface of the treated aluminum sheet. After the acetone volatilizes, the Multi-layer aluminum sheets are stacked together and the ends of the sample are fixed with glue and rolled a...

Embodiment 2

[0033] Example 2: 0.5vol.%, 2.5vol.% and 5.0vol.% of nano-zinc oxide were sandwiched between the pure aluminum that was completely annealed, deoxidized film, and degreasing treatment, and then subjected to unlubricated conditions at room temperature It continuously performs 8 passes of cumulative rolling.

[0034] In this embodiment, the aluminum content of the pure aluminum plate is 99.99%, the size is: 100×20×0.25 mm; the size of the zinc oxide particles is 248 nm. The industrial rolling mill is adopted, and the rolling speed is 187mm / min. During each rolling pass, the reduction in the thickness direction of the sample is 50%. After 8 passes of rolling, spark plasma sintering is performed on the rolled samples. The sintering temperature is 500℃, the sintering holding time is 5min, and the sintering pressure is 80MPa. During the sintering process, the sample is protected by argon gas to prevent it. Oxidation.

[0035] Figure 5 This is a scanning electron microscope (SEM) photo...

Embodiment 3

[0039] Example 3: 5.0 vol.% of nano-zinc oxide is sandwiched between pure aluminum that has been completely annealed, deoxidized film, and degreasing treatment, and then continuously rolled for 8 times under the condition of room temperature without lubrication.

[0040] In this embodiment, the aluminum content of the pure aluminum plate is 99.99%, the size is: 100×20×0.25 mm; the size of the zinc oxide particles is 248 nm. The industrial rolling mill is adopted, and the rolling speed is 187mm / min. During each rolling pass, the reduction in the thickness direction of the sample is 50%. After 12 passes of rolling, spark plasma sintering is performed on the rolled samples. The sintering temperature is 500℃, the sintering holding time is 5min, and the sintering pressure is 80MPa. During the sintering process, the sample is protected by argon gas to prevent it. Oxidation.

[0041] Figure 7 This is a scanning electron microscope (SEM) photograph of the longitudinal section of the zi...

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Abstract

The invention belongs to the field of composites and particularly relates to a preparation method of zinc oxide particle strengthened aluminum-based composite. Zinc oxide is ultrasonically dispersed and evenly applied between pure-aluminum plates that are subjected to full annealing, oxide film removal and degreasing, and the pure-aluminum plates are then subjected to multiple continuous accumulative rolling; a rolled sample is then subjected to discharge plasma sintering process; through strain strengthening and refined crystalline strengthening of the accumulative rolling process and particle strengthening of zinc oxide strengtheners, the composite finally produced has high microhardness about 2.1 times as high as that of an original pure-aluminum sample and also has high heat conductivity and low thermal expansion coefficient. The preparation method has low cost and good safety and reliability and is easy to perform, crystalline grains in the obtained aluminum-based nano composite structure are small, and the nano zinc oxide strengthening phase is evenly distributed with no evident clustering.

Description

Technical field [0001] The invention relates to a method for preparing a zinc oxide particle reinforced aluminum-based composite material, and belongs to the field of aluminum-based composite materials. Background technique [0002] Particle-reinforced aluminum-based composite materials have become the most promising development in the 21st century due to their comprehensive mechanical properties and performance such as high specific strength, high specific modulus, good high temperature performance, fatigue resistance, corrosion resistance and good electrical conductivity. One of the most advanced materials. Among them, the dispersion-enhanced aluminum-based composite material is the most common one, due to its outstanding isotropic characteristics, strong processability, low price, no aging, high temperature creep, and no release of small molecules under high vacuum conditions. Features, in the fields of aerospace, military, automobile, electronics and daily necessities have s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B21B1/38
CPCB21B1/38B21B2001/386B22F3/105
Inventor 梅青松李聪玲管茂生李杨李菊英陈峰马烨
Owner WUHAN UNIV
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