Metal-based hollow-ball composite foam material and preparation method thereof

A metal-based composite and composite foam technology, applied in the field of foam metal, can solve problems such as lack of metal-based composite foam, and achieve the effects of low cost, simple operation steps, and simple process flow

Active Publication Date: 2018-09-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, at present, the technology for the low-cost preparation of metal matrix composite foams containing large-sized ceramic hollow spheres is still relatively lacking.

Method used

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  • Metal-based hollow-ball composite foam material and preparation method thereof
  • Metal-based hollow-ball composite foam material and preparation method thereof
  • Metal-based hollow-ball composite foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Alumina hollow balls of 3.5-4mm and A356 aluminum alloy are selected as raw materials. After measurement, the average density of 3.5-4mm aluminum oxide hollow spheres is 1.027g / cm 3 , with an average wall thickness of 174 μm. use as figure 2 The crucible shown prepares syntactic foam samples with a diameter of 60 mm and a height of 50 mm.

[0035] Place 155g (40% of the total sample volume should be 152g in theory in theory, and the actual melting aluminum will be a little more) in the crucible, considering the loss of aluminum such as subsequent removal of surface oxide skin, and place the crucible in a resistance furnace. Gradually raise the temperature to 690°C and keep it at 690°C. At the same time, in another resistance furnace, 90g (60% of the total sample volume should be 87g in theory, considering that there may be a little loss when adding balls, so the actual preheated balls will be a little more) of 3.5-4mm The aluminum oxide hollow spheres and the pressin...

Embodiment 2

[0038] Compared with the previous embodiment, only the particle size of the hollow spheres in this embodiment has changed, so the preparation process will not be repeated here. Alumina hollow balls of 4.5-5mm and A356 aluminum alloy are selected as raw materials. After measurement, the average density of 4.5-5mm aluminum oxide hollow spheres is 0.938g / cm 3 , with an average wall thickness of 326 μm. use as figure 2 The crucible shown prepares syntactic foam samples with a diameter of 60 mm and a height of 50 mm. The mass of the A356 aluminum alloy initially melted in the crucible is still 155g, and the mass of the preheated 4.5-5mm alumina hollow ball is 83g. The process of preheating hollow spheres, melting aluminum—adding hollow spheres and stirring—pressurizing—insulating heat—cooling is the same as in Example 1.

[0039] The cross-sectional morphology of the prepared aluminum-based hollow sphere composite foam is as follows: image 3 (b) shown. After testing, the ove...

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Abstract

The invention relates to a metal-based hollow-ball composite foam material and a preparation method thereof. The composite foam material comprises a metal matrix and ceramic hollow balls, wherein theceramic hollow balls are uniformly distributed in the metal matrix. The preparation method has the advantages of simple operation and low cost. In the prepared aluminum-based / aluminum oxide hollow-ball composite foam material, the interface bonding of an aluminum matrix and the hollow balls is good, the grain size of the hollow balls is larger, and the volume fraction of the hollow balls is larger. The plateau stress in a compressive stress-strain curve can reach 46MPa, the plateau phase is flat and long, and the prepared aluminum-based / aluminum oxide hollow-ball composite foam material is anexcellent light energy absorbing material. Under impulse load, the plateau stress of the composite foam can be increased to about 60MPa. The composite foam material has a significant advantage and a good application prospect in the field of shock resistance and explosion protection.

Description

technical field [0001] The invention belongs to the technical field of metal foam, and relates to a metal matrix-ceramic hollow sphere composite foam material and a preparation method thereof, in particular to a metal matrix composite foam material prepared with large-diameter ceramic hollow spheres by a stirring casting method. Background technique [0002] Metal foam has the advantages of light weight, sound insulation and noise reduction, shock absorption and energy absorption, heat insulation and heat preservation, and is widely used in aerospace, rail transit, automobile manufacturing and interior decoration and other fields. The closed-cell metal foam prepared by traditional melt foaming method, melt blowing method or powder compaction melting foaming method has irregular cell shape and low mechanical properties. If the ceramic hollow spheres are implanted into the metal matrix, not only the porosity and pore size of the foam can be controlled by adjusting the amount a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C21/00C22C32/00
CPCC22C1/08C22C21/00C22C32/00
Inventor 陈祥王宁珍李言祥刘源张华伟
Owner TSINGHUA UNIV
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